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Add support for the multi-chain DEX aggregator Sifi
Testing
Testing has so far been difficult because Sifi does not support Fantom (chain 250). I have added a test case for Arbitrum. This case executes to the point where gas cannot be estimated because the impersonated account does not have the necessary token allowance set.
Status
The PR is a draft while I work with the maintainers to pass test cases.