diff --git a/packages/asset-swapper/CHANGELOG.json b/packages/asset-swapper/CHANGELOG.json
index 12b3dc00af..57fb966aaa 100644
--- a/packages/asset-swapper/CHANGELOG.json
+++ b/packages/asset-swapper/CHANGELOG.json
@@ -33,6 +33,10 @@
             {
                 "note": "Create `FakeTaker` contract to get result data and gas used",
                 "pr": 151
+            },
+            {
+                "note": "Add an alternative RFQ market making implementation",
+                "pr": 139
             }
         ]
     },
diff --git a/packages/asset-swapper/src/constants.ts b/packages/asset-swapper/src/constants.ts
index 869daa0f8c..524affb5cd 100644
--- a/packages/asset-swapper/src/constants.ts
+++ b/packages/asset-swapper/src/constants.ts
@@ -24,6 +24,7 @@ const ONE_MINUTE_SECS = 60;
 const ONE_MINUTE_MS = ONE_SECOND_MS * ONE_MINUTE_SECS;
 const DEFAULT_PER_PAGE = 1000;
 const ZERO_AMOUNT = new BigNumber(0);
+const ALT_MM_IMPUTED_INDICATIVE_EXPIRY_SECONDS = 180;
 
 const DEFAULT_ORDER_PRUNER_OPTS: OrderPrunerOpts = {
     expiryBufferMs: 120000, // 2 minutes
@@ -111,4 +112,5 @@ export const constants = {
     DEFAULT_INFO_LOGGER,
     DEFAULT_WARNING_LOGGER,
     EMPTY_BYTES32,
+    ALT_MM_IMPUTED_INDICATIVE_EXPIRY_SECONDS,
 };
diff --git a/packages/asset-swapper/src/index.ts b/packages/asset-swapper/src/index.ts
index 4a3d8f2295..9797aecd97 100644
--- a/packages/asset-swapper/src/index.ts
+++ b/packages/asset-swapper/src/index.ts
@@ -75,6 +75,8 @@ export { SwapQuoteConsumer } from './quote_consumers/swap_quote_consumer';
 export { SwapQuoter, Orderbook } from './swap_quoter';
 export {
     AffiliateFee,
+    AltOffering,
+    AltRfqtMakerAssetOfferings,
     AssetSwapperContractAddresses,
     CalldataInfo,
     ExchangeProxyContractOpts,
diff --git a/packages/asset-swapper/src/swap_quoter.ts b/packages/asset-swapper/src/swap_quoter.ts
index 357b54b611..a4acc64b84 100644
--- a/packages/asset-swapper/src/swap_quoter.ts
+++ b/packages/asset-swapper/src/swap_quoter.ts
@@ -348,6 +348,7 @@ export class SwapQuoter {
         if (calcOpts.rfqt !== undefined) {
             calcOpts.rfqt.quoteRequestor = new QuoteRequestor(
                 rfqtOptions ? rfqtOptions.makerAssetOfferings || {} : {},
+                rfqtOptions ? rfqtOptions.altRfqCreds : undefined,
                 rfqtOptions ? rfqtOptions.warningLogger : undefined,
                 rfqtOptions ? rfqtOptions.infoLogger : undefined,
                 this.expiryBufferMs,
diff --git a/packages/asset-swapper/src/types.ts b/packages/asset-swapper/src/types.ts
index 66909160d0..f4f0d38ec7 100644
--- a/packages/asset-swapper/src/types.ts
+++ b/packages/asset-swapper/src/types.ts
@@ -7,7 +7,7 @@ import {
     RfqOrderFields,
     Signature,
 } from '@0x/protocol-utils';
-import { TakerRequestQueryParams } from '@0x/quote-server';
+import { TakerRequestQueryParams, V4SignedRfqOrder } from '@0x/quote-server';
 import { BigNumber } from '@0x/utils';
 
 import {
@@ -228,6 +228,7 @@ export interface RfqtRequestOpts {
     isIndicative?: boolean;
     makerEndpointMaxResponseTimeMs?: number;
     nativeExclusivelyRFQT?: boolean;
+    altRfqtAssetOfferings?: AltRfqtMakerAssetOfferings;
 }
 
 /**
@@ -246,6 +247,25 @@ export interface RfqtMakerAssetOfferings {
     [endpoint: string]: Array<[string, string]>;
 }
 
+export interface AltOffering {
+    id: string;
+    baseAsset: string;
+    quoteAsset: string;
+    baseAssetDecimals: number;
+    quoteAssetDecimals: number;
+}
+export interface AltRfqtMakerAssetOfferings {
+    [endpoint: string]: AltOffering[];
+}
+export enum RfqPairType {
+    Standard = 'standard',
+    Alt = 'alt',
+}
+export interface TypedMakerUrl {
+    url: string;
+    pairType: RfqPairType;
+}
+
 export type LogFunction = (obj: object, msg?: string, ...args: any[]) => void;
 
 export interface RfqtFirmQuoteValidator {
@@ -255,6 +275,10 @@ export interface RfqtFirmQuoteValidator {
 export interface SwapQuoterRfqtOpts {
     takerApiKeyWhitelist: string[];
     makerAssetOfferings: RfqtMakerAssetOfferings;
+    altRfqCreds?: {
+        altRfqApiKey: string;
+        altRfqProfile: string;
+    };
     warningLogger?: LogFunction;
     infoLogger?: LogFunction;
 }
@@ -333,6 +357,17 @@ export interface MockedRfqtQuoteResponse {
     responseCode: number;
 }
 
+/**
+ * Represents a mocked RFQT maker responses.
+ */
+export interface AltMockedRfqtQuoteResponse {
+    endpoint: string;
+    mmApiKey: string;
+    requestData: AltQuoteRequestData;
+    responseData: any;
+    responseCode: number;
+}
+
 export interface SamplerOverrides {
     overrides: GethCallOverrides;
     block: BlockParam;
@@ -344,3 +379,50 @@ export interface SamplerCallResult {
 }
 
 export type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
+
+export enum AltQuoteModel {
+    Firm = 'firm',
+    Indicative = 'indicative',
+}
+
+export enum AltQuoteSide {
+    Buy = 'buy',
+    Sell = 'sell',
+}
+
+export interface AltQuoteRequestData {
+    market: string;
+    model: AltQuoteModel;
+    profile: string;
+    side: AltQuoteSide;
+    value?: string;
+    amount?: string;
+    meta: {
+        txOrigin: string;
+        taker: string;
+        client: string;
+        existingOrder?: {
+            price: string;
+            value?: string;
+            amount?: string;
+        };
+    };
+}
+
+export interface AltBaseRfqResponse extends AltQuoteRequestData {
+    id: string;
+    price?: string;
+}
+
+export interface AltIndicativeQuoteResponse extends AltBaseRfqResponse {
+    model: AltQuoteModel.Indicative;
+    status: 'live' | 'rejected';
+}
+
+export interface AltFirmQuoteResponse extends AltBaseRfqResponse {
+    model: AltQuoteModel.Firm;
+    data: {
+        '0xv4order': V4SignedRfqOrder;
+    };
+    status: 'active' | 'rejected';
+}
diff --git a/packages/asset-swapper/src/utils/alt_mm_implementation_utils.ts b/packages/asset-swapper/src/utils/alt_mm_implementation_utils.ts
new file mode 100644
index 0000000000..42006bbe50
--- /dev/null
+++ b/packages/asset-swapper/src/utils/alt_mm_implementation_utils.ts
@@ -0,0 +1,233 @@
+import { Web3Wrapper } from '@0x/dev-utils';
+import { TakerRequestQueryParams, V4RFQFirmQuote, V4RFQIndicativeQuote } from '@0x/quote-server';
+import { BigNumber } from '@0x/utils';
+import { AxiosInstance } from 'axios';
+
+import { constants } from '../constants';
+import {
+    AltFirmQuoteResponse,
+    AltIndicativeQuoteResponse,
+    AltOffering,
+    AltQuoteModel,
+    AltQuoteRequestData,
+    AltQuoteSide,
+    AltRfqtMakerAssetOfferings,
+} from '../types';
+
+function getAltMarketInfo(
+    offerings: AltOffering[],
+    buyTokenAddress: string,
+    sellTokenAddress: string,
+): AltOffering | undefined {
+    for (const offering of offerings) {
+        if (
+            (buyTokenAddress.toLowerCase() === offering.baseAsset.toLowerCase() &&
+                sellTokenAddress.toLowerCase() === offering.quoteAsset.toLowerCase()) ||
+            (sellTokenAddress.toLowerCase() === offering.baseAsset.toLowerCase() &&
+                buyTokenAddress.toLowerCase() === offering.quoteAsset.toLowerCase())
+        ) {
+            return offering;
+        }
+    }
+    return undefined;
+}
+
+function parseFirmQuoteResponseFromAltMM(altFirmQuoteReponse: AltFirmQuoteResponse): V4RFQFirmQuote {
+    return {
+        signedOrder: altFirmQuoteReponse.data['0xv4order'],
+    };
+}
+
+function parseIndicativeQuoteResponseFromAltMM(
+    altIndicativeQuoteResponse: AltIndicativeQuoteResponse,
+    altPair: AltOffering,
+    makerToken: string,
+    takerToken: string,
+): V4RFQIndicativeQuote {
+    let makerAmount: BigNumber;
+    let takerAmount: BigNumber;
+    let quoteAmount: BigNumber;
+    let baseAmount: BigNumber;
+
+    if (!altIndicativeQuoteResponse.price) {
+        throw new Error('Price not returned by alt MM');
+    }
+    if (altIndicativeQuoteResponse.amount) {
+        // if amount is specified, amount is the base token amount
+        baseAmount = Web3Wrapper.toBaseUnitAmount(
+            new BigNumber(altIndicativeQuoteResponse.amount),
+            altPair.baseAssetDecimals,
+        );
+        // if amount is specified, use the price (quote/base) to get the quote amount
+        quoteAmount = Web3Wrapper.toBaseUnitAmount(
+            new BigNumber(altIndicativeQuoteResponse.amount)
+                .times(new BigNumber(altIndicativeQuoteResponse.price))
+                .decimalPlaces(altPair.quoteAssetDecimals, BigNumber.ROUND_DOWN),
+            altPair.quoteAssetDecimals,
+        );
+    } else if (altIndicativeQuoteResponse.value) {
+        // if value is specified, value is the quote token amount
+        quoteAmount = Web3Wrapper.toBaseUnitAmount(
+            new BigNumber(altIndicativeQuoteResponse.value),
+            altPair.quoteAssetDecimals,
+        );
+        // if value is specified, use the price (quote/base) to get the base amount
+        baseAmount = Web3Wrapper.toBaseUnitAmount(
+            new BigNumber(altIndicativeQuoteResponse.value)
+                .dividedBy(new BigNumber(altIndicativeQuoteResponse.price))
+                .decimalPlaces(altPair.baseAssetDecimals, BigNumber.ROUND_DOWN),
+            altPair.baseAssetDecimals,
+        );
+    } else {
+        throw new Error('neither amount or value were specified');
+    }
+    if (makerToken.toLowerCase() === altPair.baseAsset.toLowerCase()) {
+        makerAmount = baseAmount;
+        takerAmount = quoteAmount;
+    } else if (makerToken.toLowerCase() === altPair.quoteAsset.toLowerCase()) {
+        makerAmount = quoteAmount;
+        takerAmount = baseAmount;
+    } else {
+        throw new Error(`Base, quote tokens don't align with maker, taker tokens`);
+    }
+
+    return {
+        makerToken,
+        makerAmount,
+        takerToken,
+        takerAmount,
+        // HACK: alt implementation does not return an expiration with indicative quotes
+        // return now + { IMPUTED EXPIRY SECONDS } to have it included after order checks
+        expiry:
+            // tslint:disable-next-line:custom-no-magic-numbers
+            new BigNumber(Date.now() / 1000)
+                .integerValue(BigNumber.ROUND_DOWN)
+                .plus(constants.ALT_MM_IMPUTED_INDICATIVE_EXPIRY_SECONDS),
+    };
+}
+
+/**
+ * Turn a standard quote request into an alt quote request
+ * and return the appropriate standard quote response
+ */
+export async function returnQuoteFromAltMMAsync<ResponseT>(
+    url: string,
+    apiKey: string,
+    profile: string,
+    integratorKey: string,
+    quoteModel: AltQuoteModel,
+    makerToken: string,
+    takerToken: string,
+    maxResponseTimeMs: number,
+    altRfqtAssetOfferings: AltRfqtMakerAssetOfferings,
+    takerRequestQueryParams: TakerRequestQueryParams,
+    axiosInstance: AxiosInstance,
+): Promise<{ data: ResponseT; status: number }> {
+    const altPair = getAltMarketInfo(
+        altRfqtAssetOfferings[url],
+        takerRequestQueryParams.buyTokenAddress,
+        takerRequestQueryParams.sellTokenAddress,
+    );
+
+    if (!altPair) {
+        throw new Error(`Alt pair not found`);
+    }
+    const side = altPair.baseAsset === takerRequestQueryParams.buyTokenAddress ? AltQuoteSide.Sell : AltQuoteSide.Buy;
+
+    // comparison price needs to be quote/base
+    // in the standard implementation, it's maker/taker
+    let altComparisonPrice: string | undefined;
+    if (altPair.quoteAsset === makerToken) {
+        altComparisonPrice = takerRequestQueryParams.comparisonPrice
+            ? takerRequestQueryParams.comparisonPrice
+            : undefined;
+    } else {
+        altComparisonPrice = takerRequestQueryParams.comparisonPrice
+            ? new BigNumber(takerRequestQueryParams.comparisonPrice).pow(-1).toString()
+            : undefined;
+    }
+
+    let data: AltQuoteRequestData;
+    data = {
+        market: `${altPair.id}`,
+        model: quoteModel,
+        profile,
+        side,
+        meta: {
+            txOrigin: takerRequestQueryParams.txOrigin!,
+            taker: takerRequestQueryParams.takerAddress,
+            client: integratorKey,
+        },
+    };
+
+    // specify a comparison price if it exists
+    if (altComparisonPrice) {
+        data.meta.existingOrder = {
+            price: altComparisonPrice,
+        };
+    }
+
+    // need to specify amount or value
+    // amount is units of the base asset
+    // value is units of the quote asset
+    let requestSize: string;
+    if (takerRequestQueryParams.buyAmountBaseUnits) {
+        requestSize = Web3Wrapper.toUnitAmount(
+            new BigNumber(takerRequestQueryParams.buyAmountBaseUnits),
+            takerRequestQueryParams.buyTokenAddress === altPair.baseAsset
+                ? altPair.baseAssetDecimals
+                : altPair.quoteAssetDecimals,
+        ).toString();
+        if (takerRequestQueryParams.buyTokenAddress === altPair.baseAsset) {
+            data.amount = requestSize;
+            // add to 'existing order' if there is a comparison price
+            if (data.meta.existingOrder) {
+                data.meta.existingOrder.amount = requestSize;
+            }
+        } else {
+            data.value = requestSize;
+            // add to 'existing order' if there is a comparison price
+            if (data.meta.existingOrder) {
+                data.meta.existingOrder.value = requestSize;
+            }
+        }
+    } else if (takerRequestQueryParams.sellAmountBaseUnits) {
+        requestSize = Web3Wrapper.toUnitAmount(
+            new BigNumber(takerRequestQueryParams.sellAmountBaseUnits),
+            takerRequestQueryParams.sellTokenAddress === altPair.baseAsset
+                ? altPair.baseAssetDecimals
+                : altPair.quoteAssetDecimals,
+        ).toString();
+        if (takerRequestQueryParams.sellTokenAddress === altPair.baseAsset) {
+            data.amount = requestSize;
+            if (data.meta.existingOrder) {
+                data.meta.existingOrder.amount = requestSize;
+            }
+        } else {
+            data.value = requestSize;
+            if (data.meta.existingOrder) {
+                data.meta.existingOrder.value = requestSize;
+            }
+        }
+    }
+
+    const response = await axiosInstance.post(`${url}/quotes`, data, {
+        headers: { Authorization: `Bearer ${apiKey}` },
+        timeout: maxResponseTimeMs,
+    });
+
+    if (response.data.status === 'rejected') {
+        throw new Error('alt MM rejected quote');
+    }
+
+    const parsedResponse =
+        quoteModel === 'firm'
+            ? parseFirmQuoteResponseFromAltMM(response.data)
+            : parseIndicativeQuoteResponseFromAltMM(response.data, altPair, makerToken, takerToken);
+
+    return {
+        // hack to appease type checking
+        data: (parsedResponse as unknown) as ResponseT,
+        status: response.status,
+    };
+}
diff --git a/packages/asset-swapper/src/utils/quote_requestor.ts b/packages/asset-swapper/src/utils/quote_requestor.ts
index 3f158c1ef6..96db143b00 100644
--- a/packages/asset-swapper/src/utils/quote_requestor.ts
+++ b/packages/asset-swapper/src/utils/quote_requestor.ts
@@ -7,8 +7,19 @@ import { Agent as HttpAgent } from 'http';
 import { Agent as HttpsAgent } from 'https';
 
 import { constants } from '../constants';
-import { LogFunction, MarketOperation, RfqtMakerAssetOfferings, RfqtRequestOpts, SignedNativeOrder } from '../types';
+import {
+    AltQuoteModel,
+    AltRfqtMakerAssetOfferings,
+    LogFunction,
+    MarketOperation,
+    RfqPairType,
+    RfqtMakerAssetOfferings,
+    RfqtRequestOpts,
+    SignedNativeOrder,
+    TypedMakerUrl,
+} from '../types';
 
+import { returnQuoteFromAltMMAsync } from './alt_mm_implementation_utils';
 import { ONE_SECOND_MS } from './market_operation_utils/constants';
 import { RfqMakerBlacklist } from './rfq_maker_blacklist';
 
@@ -126,6 +137,7 @@ export class QuoteRequestor {
 
     constructor(
         private readonly _rfqtAssetOfferings: RfqtMakerAssetOfferings,
+        private readonly _altRfqCreds?: { altRfqApiKey: string; altRfqProfile: string },
         private readonly _warningLogger: LogFunction = constants.DEFAULT_WARNING_LOGGER,
         private readonly _infoLogger: LogFunction = constants.DEFAULT_INFO_LOGGER,
         private readonly _expiryBufferMs: number = constants.DEFAULT_SWAP_QUOTER_OPTS.expiryBufferMs,
@@ -311,13 +323,29 @@ export class QuoteRequestor {
         return true;
     }
 
-    private _makerSupportsPair(makerUrl: string, makerToken: string, takerToken: string): boolean {
-        for (const assetPair of this._rfqtAssetOfferings[makerUrl]) {
-            if (
-                (assetPair[0] === makerToken && assetPair[1] === takerToken) ||
-                (assetPair[0] === takerToken && assetPair[1] === makerToken)
-            ) {
-                return true;
+    private _makerSupportsPair(
+        typedMakerUrl: TypedMakerUrl,
+        makerToken: string,
+        takerToken: string,
+        altMakerAssetOfferings: AltRfqtMakerAssetOfferings | undefined,
+    ): boolean {
+        if (typedMakerUrl.pairType === RfqPairType.Standard) {
+            for (const assetPair of this._rfqtAssetOfferings[typedMakerUrl.url]) {
+                if (
+                    (assetPair[0] === makerToken && assetPair[1] === takerToken) ||
+                    (assetPair[0] === takerToken && assetPair[1] === makerToken)
+                ) {
+                    return true;
+                }
+            }
+        } else if (typedMakerUrl.pairType === RfqPairType.Alt && altMakerAssetOfferings) {
+            for (const altAssetPair of altMakerAssetOfferings[typedMakerUrl.url]) {
+                if (
+                    (altAssetPair.baseAsset === makerToken && altAssetPair.quoteAsset === takerToken) ||
+                    (altAssetPair.baseAsset === takerToken && altAssetPair.quoteAsset === makerToken)
+                ) {
+                    return true;
+                }
             }
         }
         return false;
@@ -347,6 +375,7 @@ export class QuoteRequestor {
             assetFillAmount,
             comparisonPrice,
         );
+
         const quotePath = (() => {
             switch (quoteType) {
                 case 'firm':
@@ -358,45 +387,95 @@ export class QuoteRequestor {
             }
         })();
 
-        const makerUrls = Object.keys(this._rfqtAssetOfferings);
-        const quotePromises = makerUrls.map(async url => {
+        const standardUrls = Object.keys(this._rfqtAssetOfferings).map(
+            (mm: string): TypedMakerUrl => {
+                return { pairType: RfqPairType.Standard, url: mm };
+            },
+        );
+        const altUrls = options.altRfqtAssetOfferings
+            ? Object.keys(options.altRfqtAssetOfferings).map(
+                  (mm: string): TypedMakerUrl => {
+                      return { pairType: RfqPairType.Alt, url: mm };
+                  },
+              )
+            : [];
+
+        const typedMakerUrls = standardUrls.concat(altUrls);
+
+        const quotePromises = typedMakerUrls.map(async typedMakerUrl => {
             // filter out requests to skip
-            const isBlacklisted = rfqMakerBlacklist.isMakerBlacklisted(url);
-            const partialLogEntry = { url, quoteType, requestParams, isBlacklisted };
+            const isBlacklisted = rfqMakerBlacklist.isMakerBlacklisted(typedMakerUrl.url);
+            const partialLogEntry = { url: typedMakerUrl.url, quoteType, requestParams, isBlacklisted };
             if (isBlacklisted) {
                 this._infoLogger({ rfqtMakerInteraction: { ...partialLogEntry } });
                 return;
-            } else if (!this._makerSupportsPair(url, makerToken, takerToken)) {
+            } else if (!this._makerSupportsPair(typedMakerUrl, makerToken, takerToken, options.altRfqtAssetOfferings)) {
                 return;
             } else {
-                // make request to MMs
+                // make request to MM
                 const timeBeforeAwait = Date.now();
                 const maxResponseTimeMs =
                     options.makerEndpointMaxResponseTimeMs === undefined
                         ? constants.DEFAULT_RFQT_REQUEST_OPTS.makerEndpointMaxResponseTimeMs!
                         : options.makerEndpointMaxResponseTimeMs;
                 try {
-                    const response = await quoteRequestorHttpClient.get<ResponseT>(`${url}/${quotePath}`, {
-                        headers: { '0x-api-key': options.apiKey },
-                        params: requestParams,
-                        timeout: maxResponseTimeMs,
-                    });
-                    const latencyMs = Date.now() - timeBeforeAwait;
-                    this._infoLogger({
-                        rfqtMakerInteraction: {
-                            ...partialLogEntry,
-                            response: {
-                                included: true,
-                                apiKey: options.apiKey,
-                                takerAddress: requestParams.takerAddress,
-                                txOrigin: requestParams.txOrigin,
-                                statusCode: response.status,
-                                latencyMs,
+                    if (typedMakerUrl.pairType === RfqPairType.Standard) {
+                        const response = await quoteRequestorHttpClient.get(`${typedMakerUrl.url}/${quotePath}`, {
+                            headers: { '0x-api-key': options.apiKey },
+                            params: requestParams,
+                            timeout: maxResponseTimeMs,
+                        });
+                        const latencyMs = Date.now() - timeBeforeAwait;
+                        this._infoLogger({
+                            rfqtMakerInteraction: {
+                                ...partialLogEntry,
+                                response: {
+                                    included: true,
+                                    apiKey: options.apiKey,
+                                    takerAddress: requestParams.takerAddress,
+                                    txOrigin: requestParams.txOrigin,
+                                    statusCode: response.status,
+                                    latencyMs,
+                                },
                             },
-                        },
-                    });
-                    rfqMakerBlacklist.logTimeoutOrLackThereof(url, latencyMs >= maxResponseTimeMs);
-                    return { response: response.data, makerUri: url };
+                        });
+                        rfqMakerBlacklist.logTimeoutOrLackThereof(typedMakerUrl.url, latencyMs >= maxResponseTimeMs);
+                        return { response: response.data, makerUri: typedMakerUrl.url };
+                    } else {
+                        if (this._altRfqCreds === undefined) {
+                            throw new Error(`don't have credentials for alt MM`);
+                        }
+                        const quote = await returnQuoteFromAltMMAsync<ResponseT>(
+                            typedMakerUrl.url,
+                            this._altRfqCreds.altRfqApiKey,
+                            this._altRfqCreds.altRfqProfile,
+                            options.apiKey,
+                            quoteType === 'firm' ? AltQuoteModel.Firm : AltQuoteModel.Indicative,
+                            makerToken,
+                            takerToken,
+                            maxResponseTimeMs,
+                            options.altRfqtAssetOfferings || {},
+                            requestParams,
+                            quoteRequestorHttpClient,
+                        );
+
+                        const latencyMs = Date.now() - timeBeforeAwait;
+                        this._infoLogger({
+                            rfqtMakerInteraction: {
+                                ...partialLogEntry,
+                                response: {
+                                    included: true,
+                                    apiKey: options.apiKey,
+                                    takerAddress: requestParams.takerAddress,
+                                    txOrigin: requestParams.txOrigin,
+                                    statusCode: quote.status,
+                                    latencyMs,
+                                },
+                            },
+                        });
+                        rfqMakerBlacklist.logTimeoutOrLackThereof(typedMakerUrl.url, latencyMs >= maxResponseTimeMs);
+                        return { response: quote.data, makerUri: typedMakerUrl.url };
+                    }
                 } catch (err) {
                     // log error if any
                     const latencyMs = Date.now() - timeBeforeAwait;
@@ -413,12 +492,14 @@ export class QuoteRequestor {
                             },
                         },
                     });
-                    rfqMakerBlacklist.logTimeoutOrLackThereof(url, latencyMs >= maxResponseTimeMs);
+                    rfqMakerBlacklist.logTimeoutOrLackThereof(typedMakerUrl.url, latencyMs >= maxResponseTimeMs);
                     this._warningLogger(
                         convertIfAxiosError(err),
-                        `Failed to get RFQ-T ${quoteType} quote from market maker endpoint ${url} for API key ${
-                            options.apiKey
-                        } for taker address ${options.takerAddress} and tx origin ${options.txOrigin}`,
+                        `Failed to get RFQ-T ${quoteType} quote from market maker endpoint ${
+                            typedMakerUrl.url
+                        } for API key ${options.apiKey} for taker address ${options.takerAddress} and tx origin ${
+                            options.txOrigin
+                        }`,
                     );
                     return;
                 }
diff --git a/packages/asset-swapper/test/quote_requestor_test.ts b/packages/asset-swapper/test/quote_requestor_test.ts
index 12d3d05ffb..96859aaf35 100644
--- a/packages/asset-swapper/test/quote_requestor_test.ts
+++ b/packages/asset-swapper/test/quote_requestor_test.ts
@@ -1,14 +1,22 @@
 import { tokenUtils } from '@0x/dev-utils';
 import { FillQuoteTransformerOrderType, SignatureType } from '@0x/protocol-utils';
-import { TakerRequestQueryParams } from '@0x/quote-server';
+import { TakerRequestQueryParams, V4RFQIndicativeQuote } from '@0x/quote-server';
 import { StatusCodes } from '@0x/types';
-import { BigNumber } from '@0x/utils';
+import { BigNumber, logUtils } from '@0x/utils';
 import * as chai from 'chai';
 import _ = require('lodash');
 import 'mocha';
 
 import { constants } from '../src/constants';
-import { MarketOperation, MockedRfqtQuoteResponse } from '../src/types';
+import {
+    AltMockedRfqtQuoteResponse,
+    AltQuoteModel,
+    AltQuoteRequestData,
+    AltQuoteSide,
+    AltRfqtMakerAssetOfferings,
+    MarketOperation,
+    MockedRfqtQuoteResponse,
+} from '../src/types';
 import { NULL_ADDRESS } from '../src/utils/market_operation_utils/constants';
 import { QuoteRequestor, quoteRequestorHttpClient } from '../src/utils/quote_requestor';
 
@@ -17,6 +25,12 @@ import { RfqtQuoteEndpoint, testHelpers } from './utils/test_helpers';
 
 chaiSetup.configure();
 const expect = chai.expect;
+const ALT_MM_API_KEY = 'averysecurekey';
+const ALT_PROFILE = 'acoolprofile';
+const ALT_RFQ_CREDS = {
+    altRfqApiKey: ALT_MM_API_KEY,
+    altRfqProfile: ALT_PROFILE,
+};
 
 function makeThreeMinuteExpiry(): BigNumber {
     const expiry = new Date(Date.now());
@@ -28,6 +42,18 @@ describe('QuoteRequestor', async () => {
     const [makerToken, takerToken, otherToken1] = tokenUtils.getDummyERC20TokenAddresses();
     const validSignature = { v: 28, r: '0x', s: '0x', signatureType: SignatureType.EthSign };
 
+    const altRfqtAssetOfferings: AltRfqtMakerAssetOfferings = {
+        'https://132.0.0.1': [
+            {
+                id: 'XYZ-123',
+                baseAsset: makerToken,
+                quoteAsset: takerToken,
+                baseAssetDecimals: 2,
+                quoteAssetDecimals: 3,
+            },
+        ],
+    };
+
     describe('requestRfqtFirmQuotesAsync for firm quotes', async () => {
         it('should return successful RFQT requests', async () => {
             const takerAddress = '0xd209925defc99488e3afff1174e48b4fa628302a';
@@ -37,6 +63,8 @@ describe('QuoteRequestor', async () => {
             // Set up RFQT responses
             // tslint:disable-next-line:array-type
             const mockedRequests: MockedRfqtQuoteResponse[] = [];
+            const altMockedRequests: AltMockedRfqtQuoteResponse[] = [];
+
             const expectedParams: TakerRequestQueryParams = {
                 sellTokenAddress: takerToken,
                 buyTokenAddress: makerToken,
@@ -66,6 +94,30 @@ describe('QuoteRequestor', async () => {
                 expiry: makeThreeMinuteExpiry(),
                 signature: validSignature,
             };
+            // request is to sell 10000 units of the base token
+            // 10 units at 3 decimals
+            const altFirmRequestData = {
+                market: 'XYZ-123',
+                model: AltQuoteModel.Firm,
+                profile: ALT_PROFILE,
+                side: AltQuoteSide.Sell,
+                meta: {
+                    txOrigin,
+                    taker: takerAddress,
+                    client: apiKey,
+                },
+                value: '10',
+            };
+            const altFirmResponse = {
+                ...altFirmRequestData,
+                id: 'random_id',
+                // tslint:disable-next-line:custom-no-magic-numbers
+                price: new BigNumber(10 / 100).toString(),
+                status: 'active',
+                data: {
+                    '0xv4order': validSignedOrder,
+                },
+            };
 
             // Successful response
             mockedRequests.push({
@@ -124,6 +176,14 @@ describe('QuoteRequestor', async () => {
                 endpoint: 'https://425.0.0.1',
                 responseData: { signedOrder: { ...validSignedOrder, txOrigin: NULL_ADDRESS } },
             });
+            // A successful response code and order from an alt RFQ implementation
+            altMockedRequests.push({
+                endpoint: 'https://132.0.0.1',
+                mmApiKey: ALT_MM_API_KEY,
+                responseCode: StatusCodes.Success,
+                requestData: altFirmRequestData,
+                responseData: altFirmResponse,
+            });
 
             const normalizedSuccessfulOrder = {
                 order: {
@@ -139,20 +199,24 @@ describe('QuoteRequestor', async () => {
 
             return testHelpers.withMockedRfqtQuotes(
                 mockedRequests,
+                altMockedRequests,
                 RfqtQuoteEndpoint.Firm,
                 async () => {
-                    const qr = new QuoteRequestor({
-                        'https://1337.0.0.1': [[makerToken, takerToken]],
-                        'https://420.0.0.1': [[makerToken, takerToken]],
-                        'https://421.0.0.1': [[makerToken, takerToken]],
-                        'https://421.1.0.1': [[makerToken, takerToken]],
-                        'https://422.0.0.1': [[makerToken, takerToken]],
-                        'https://423.0.0.1': [[makerToken, takerToken]],
-                        'https://424.0.0.1': [[makerToken, takerToken]],
-                        'https://425.0.0.1': [[makerToken, takerToken]],
-                        'https://426.0.0.1': [] /* Shouldn't ping an RFQ-T provider when they don't support the requested asset pair. */,
-                        'https://37.0.0.1': [[makerToken, takerToken]],
-                    });
+                    const qr = new QuoteRequestor(
+                        {
+                            'https://1337.0.0.1': [[makerToken, takerToken]],
+                            'https://420.0.0.1': [[makerToken, takerToken]],
+                            'https://421.0.0.1': [[makerToken, takerToken]],
+                            'https://421.1.0.1': [[makerToken, takerToken]],
+                            'https://422.0.0.1': [[makerToken, takerToken]],
+                            'https://423.0.0.1': [[makerToken, takerToken]],
+                            'https://424.0.0.1': [[makerToken, takerToken]],
+                            'https://425.0.0.1': [[makerToken, takerToken]],
+                            'https://426.0.0.1': [] /* Shouldn't ping an RFQ-T provider when they don't support the requested asset pair. */,
+                            'https://37.0.0.1': [[makerToken, takerToken]],
+                        },
+                        ALT_RFQ_CREDS,
+                    );
                     const resp = await qr.requestRfqtFirmQuotesAsync(
                         makerToken,
                         takerToken,
@@ -164,9 +228,14 @@ describe('QuoteRequestor', async () => {
                             takerAddress,
                             txOrigin: takerAddress,
                             intentOnFilling: true,
+                            altRfqtAssetOfferings,
                         },
                     );
-                    expect(resp).to.deep.eq([normalizedSuccessfulOrder, normalizedSuccessfulOrder]);
+                    expect(resp).to.deep.eq([
+                        normalizedSuccessfulOrder,
+                        normalizedSuccessfulOrder,
+                        normalizedSuccessfulOrder,
+                    ]);
                 },
                 quoteRequestorHttpClient,
             );
@@ -255,6 +324,7 @@ describe('QuoteRequestor', async () => {
 
             return testHelpers.withMockedRfqtQuotes(
                 mockedRequests,
+                [],
                 RfqtQuoteEndpoint.Indicative,
                 async () => {
                     const qr = new QuoteRequestor({
@@ -318,6 +388,7 @@ describe('QuoteRequestor', async () => {
 
             return testHelpers.withMockedRfqtQuotes(
                 mockedRequests,
+                [],
                 RfqtQuoteEndpoint.Indicative,
                 async () => {
                     const qr = new QuoteRequestor({ 'https://1337.0.0.1': [[makerToken, takerToken]] });
@@ -339,5 +410,241 @@ describe('QuoteRequestor', async () => {
                 quoteRequestorHttpClient,
             );
         });
+        it('should return successful alt indicative quotes', async () => {
+            const takerAddress = '0xd209925defc99488e3afff1174e48b4fa628302a';
+            const txOrigin = '0xf209925defc99488e3afff1174e48b4fa628302a';
+            const apiKey = 'my-ko0l-api-key';
+
+            // base token has 2 decimals
+            // quote token has 3 decimals
+            const baseToken = makerToken;
+            const quoteToken = takerToken;
+
+            // Set up RFQT responses
+            const altMockedRequests: AltMockedRfqtQuoteResponse[] = [];
+            const altScenarios: Array<{
+                successfulQuote: V4RFQIndicativeQuote;
+                requestedMakerToken: string;
+                requestedTakerToken: string;
+                requestedAmount: BigNumber;
+                requestedOperation: MarketOperation;
+            }> = [];
+
+            // SCENARIO 1
+            // buy, base asset specified
+            // requesting to buy 100 units (10000 base units) of the base token
+            // returning a price of 0.01, which should mean 10000 maker, 1000 taker amount
+            const buyAmountAltRequest: AltQuoteRequestData = {
+                market: 'XYZ-123',
+                model: AltQuoteModel.Indicative,
+                profile: ALT_PROFILE,
+                side: AltQuoteSide.Sell,
+                meta: {
+                    txOrigin,
+                    taker: takerAddress,
+                    client: apiKey,
+                },
+                amount: '100',
+            };
+            // Successful response
+            const buyAmountAltResponse = {
+                ...buyAmountAltRequest,
+                id: 'random_id',
+                // tslint:disable-next-line:custom-no-magic-numbers
+                price: new BigNumber(0.01).toString(),
+                status: 'live',
+            };
+            const successfulBuyAmountQuote: V4RFQIndicativeQuote = {
+                makerToken: baseToken,
+                takerToken: quoteToken,
+                makerAmount: new BigNumber(10000),
+                takerAmount: new BigNumber(1000),
+                expiry: new BigNumber(0),
+            };
+            altMockedRequests.push({
+                endpoint: 'https://132.0.0.1',
+                mmApiKey: ALT_MM_API_KEY,
+                responseCode: StatusCodes.Success,
+                requestData: buyAmountAltRequest,
+                responseData: buyAmountAltResponse,
+            });
+            altScenarios.push({
+                successfulQuote: successfulBuyAmountQuote,
+                requestedMakerToken: baseToken,
+                requestedTakerToken: quoteToken,
+                requestedAmount: new BigNumber(10000),
+                requestedOperation: MarketOperation.Buy,
+            });
+
+            // SCENARIO 2
+            // alt buy, quote asset specified
+            // user is requesting to sell 1 unit of the quote token, or 1000 base units
+            // returning a price of 0.01, which should mean 10000 maker amount, 1000 taker amount
+            const buyValueAltRequest: AltQuoteRequestData = {
+                market: 'XYZ-123',
+                model: AltQuoteModel.Indicative,
+                profile: ALT_PROFILE,
+                side: AltQuoteSide.Sell,
+                meta: {
+                    txOrigin,
+                    taker: takerAddress,
+                    client: apiKey,
+                },
+                value: '1',
+            };
+            // Successful response
+            const buyValueAltResponse = {
+                ...buyValueAltRequest,
+                id: 'random_id',
+                // tslint:disable-next-line:custom-no-magic-numbers
+                price: new BigNumber(0.01).toString(),
+                status: 'live',
+            };
+            const successfulBuyValueQuote: V4RFQIndicativeQuote = {
+                makerToken: baseToken,
+                takerToken: quoteToken,
+                makerAmount: new BigNumber(10000),
+                takerAmount: new BigNumber(1000),
+                expiry: new BigNumber(0),
+            };
+            altMockedRequests.push({
+                endpoint: 'https://132.0.0.1',
+                mmApiKey: ALT_MM_API_KEY,
+                responseCode: StatusCodes.Success,
+                requestData: buyValueAltRequest,
+                responseData: buyValueAltResponse,
+            });
+            altScenarios.push({
+                successfulQuote: successfulBuyValueQuote,
+                requestedMakerToken: baseToken,
+                requestedTakerToken: quoteToken,
+                requestedAmount: new BigNumber(1000),
+                requestedOperation: MarketOperation.Sell,
+            });
+
+            // SCENARIO 3
+            // alt sell, base asset specified
+            // user is requesting to sell 100 units (10000 base units) of the base token
+            // returning a price of 0.01, which should mean 10000 taker amount, 1000 maker amount
+            const sellAmountAltRequest: AltQuoteRequestData = {
+                market: 'XYZ-123',
+                model: AltQuoteModel.Indicative,
+                profile: ALT_PROFILE,
+                side: AltQuoteSide.Buy,
+                meta: {
+                    txOrigin,
+                    taker: takerAddress,
+                    client: apiKey,
+                },
+                amount: '100',
+            };
+            // Successful response
+            const sellAmountAltResponse = {
+                ...sellAmountAltRequest,
+                id: 'random_id',
+                // tslint:disable-next-line:custom-no-magic-numbers
+                price: new BigNumber(0.01).toString(),
+                status: 'live',
+            };
+            const successfulSellAmountQuote: V4RFQIndicativeQuote = {
+                makerToken: quoteToken,
+                takerToken: baseToken,
+                makerAmount: new BigNumber(1000),
+                takerAmount: new BigNumber(10000),
+                expiry: new BigNumber(0),
+            };
+            altMockedRequests.push({
+                endpoint: 'https://132.0.0.1',
+                mmApiKey: ALT_MM_API_KEY,
+                responseCode: StatusCodes.Success,
+                requestData: sellAmountAltRequest,
+                responseData: sellAmountAltResponse,
+            });
+            altScenarios.push({
+                successfulQuote: successfulSellAmountQuote,
+                requestedMakerToken: quoteToken,
+                requestedTakerToken: baseToken,
+                requestedAmount: new BigNumber(10000),
+                requestedOperation: MarketOperation.Sell,
+            });
+
+            // SCENARIO 4
+            // alt sell, quote asset specified
+            // user is requesting to buy 1 unit (1000 base units) of the quote token
+            // returning a price of 0.01, which should mean 10000 taker amount, 1000 maker amount
+            const sellValueAltRequest: AltQuoteRequestData = {
+                market: 'XYZ-123',
+                model: AltQuoteModel.Indicative,
+                profile: ALT_PROFILE,
+                side: AltQuoteSide.Buy,
+                meta: {
+                    txOrigin,
+                    taker: takerAddress,
+                    client: apiKey,
+                },
+                value: '1',
+            };
+            // Successful response
+            const sellValueAltResponse = {
+                ...sellValueAltRequest,
+                id: 'random_id',
+                // tslint:disable-next-line:custom-no-magic-numbers
+                price: new BigNumber(0.01).toString(),
+                status: 'live',
+            };
+            const successfulSellValueQuote: V4RFQIndicativeQuote = {
+                makerToken: quoteToken,
+                takerToken: baseToken,
+                makerAmount: new BigNumber(1000),
+                takerAmount: new BigNumber(10000),
+                expiry: new BigNumber(0),
+            };
+            altMockedRequests.push({
+                endpoint: 'https://132.0.0.1',
+                mmApiKey: ALT_MM_API_KEY,
+                responseCode: StatusCodes.Success,
+                requestData: sellValueAltRequest,
+                responseData: sellValueAltResponse,
+            });
+            altScenarios.push({
+                successfulQuote: successfulSellValueQuote,
+                requestedMakerToken: quoteToken,
+                requestedTakerToken: baseToken,
+                requestedAmount: new BigNumber(1000),
+                requestedOperation: MarketOperation.Buy,
+            });
+
+            let scenarioCounter = 1;
+            for (const altScenario of altScenarios) {
+                logUtils.log(`Alt MM indicative scenario ${scenarioCounter}`);
+                scenarioCounter += 1;
+                await testHelpers.withMockedRfqtQuotes(
+                    [],
+                    altMockedRequests,
+                    RfqtQuoteEndpoint.Indicative,
+                    async () => {
+                        const qr = new QuoteRequestor({}, ALT_RFQ_CREDS);
+                        const resp = await qr.requestRfqtIndicativeQuotesAsync(
+                            altScenario.requestedMakerToken,
+                            altScenario.requestedTakerToken,
+                            altScenario.requestedAmount,
+                            altScenario.requestedOperation,
+                            undefined,
+                            {
+                                apiKey,
+                                takerAddress,
+                                txOrigin,
+                                intentOnFilling: true,
+                                altRfqtAssetOfferings,
+                            },
+                        );
+                        // hack to get the expiry right, since it's dependent on the current timestamp
+                        const expected = { ...altScenario.successfulQuote, expiry: resp[0].expiry };
+                        expect(resp.sort()).to.eql([expected].sort());
+                    },
+                    quoteRequestorHttpClient,
+                );
+            }
+        });
     });
 });
diff --git a/packages/asset-swapper/test/utils/test_helpers.ts b/packages/asset-swapper/test/utils/test_helpers.ts
index 6bd389ca9b..0caf4d3119 100644
--- a/packages/asset-swapper/test/utils/test_helpers.ts
+++ b/packages/asset-swapper/test/utils/test_helpers.ts
@@ -1,9 +1,10 @@
 import { BigNumber } from '@0x/utils';
 import axios, { AxiosInstance } from 'axios';
 import AxiosMockAdapter from 'axios-mock-adapter';
+import * as _ from 'lodash';
 
 import { InsufficientAssetLiquidityError } from '../../src/errors';
-import { MockedRfqtQuoteResponse } from '../../src/types';
+import { AltMockedRfqtQuoteResponse, MockedRfqtQuoteResponse } from '../../src/types';
 
 export enum RfqtQuoteEndpoint {
     Indicative = 'price',
@@ -36,21 +37,44 @@ export const testHelpers = {
      * requests to RFQ-t providers
      */
     withMockedRfqtQuotes: async (
-        mockedResponses: MockedRfqtQuoteResponse[],
+        standardMockedResponses: MockedRfqtQuoteResponse[],
+        altMockedResponses: AltMockedRfqtQuoteResponse[],
         quoteType: RfqtQuoteEndpoint,
         afterResponseCallback: () => Promise<void>,
         axiosClient: AxiosInstance = axios,
     ): Promise<void> => {
-        const mockedAxios = new AxiosMockAdapter(axiosClient);
+        const mockedAxios = new AxiosMockAdapter(axiosClient, { onNoMatch: 'throwException' });
         try {
-            // Mock out RFQT responses
-            for (const mockedResponse of mockedResponses) {
+            // Mock out Standard RFQT responses
+            for (const mockedResponse of standardMockedResponses) {
                 const { endpoint, requestApiKey, requestParams, responseData, responseCode } = mockedResponse;
                 const requestHeaders = { Accept: 'application/json, text/plain, */*', '0x-api-key': requestApiKey };
                 mockedAxios
                     .onGet(`${endpoint}/${quoteType}`, { params: requestParams }, requestHeaders)
                     .replyOnce(responseCode, responseData);
             }
+            // Mock out Alt RFQT responses
+            for (const mockedResponse of altMockedResponses) {
+                const { endpoint, mmApiKey, requestData, responseData, responseCode } = mockedResponse;
+                const requestHeaders = {
+                    Accept: 'application/json, text/plain, */*',
+                    'Content-Type': 'application/json;charset=utf-8',
+                    Authorization: `Bearer ${mmApiKey}`,
+                };
+                mockedAxios
+                    .onPost(
+                        `${endpoint}/quotes`,
+                        // hack to get AxiosMockAdapter to recognize the match
+                        // b/t the mock data and the request data
+                        {
+                            asymmetricMatch: (x: any) => {
+                                return _.isEqual(requestData, x);
+                            },
+                        },
+                        requestHeaders,
+                    )
+                    .replyOnce(responseCode, responseData);
+            }
             // Perform the callback function, e.g. a test validation
             await afterResponseCallback();
         } finally {