f6edbd210c
* Update protocol docs * Added functions * fix table * eligbility section? * Trader.xyz shoutout * Up to
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1.1 KiB
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26 lines
1.1 KiB
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###############################
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Exceptional ERC20s
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###############################
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Some ERC20s have unique behavior that may require extra handling. We document these here as they are discovered.
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Assert vs Require
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-----------------
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These ERC20's use `assert` instead of `require`, which means that if the token reverts then (nearly) all
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of the gas from your transaction will be consumed. Specifically, you are left with 1/64 of the gas limit.
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Be mindful of this when implementing fallback logic; for example, if a call to `transferFrom` reverts then
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note you will only have 1/64 of the gas limit to handle the exception.
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Known tokens:
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- KNC
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- LINK
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- sUSD
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- USDT
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Tokens with Fees on Transfer
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----------------------------
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These tokens do not follow the ERC20 specification. As such the protocol expects the transfer to transfer
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the specified amount, or revert. Since tokens with transfer fees do not meet this criteria, the behaviour
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of the protocol with these tokens is unspecified. In most cases it will result in an overall transaction failure
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due to various slippage protections. |