GM SWAP

A quote is a promise the chain hasn't made yet. Before any interface existed we set the swap path: minimum-out enforced by the EVM on every call, exact-value ERC-20 approvals instead of unlimited allowances, and rates computed from pool reserves at the current block. There is no rate on screen the chain didn't produce, and nothing cached ahead of it.

Onto that warp we shipped in weekly passes: MetaMask connection over EIP-1193, with chain switches and account changes handled rather than assumed; live rate previews that re-quote on every new block; gas estimation and EIP-1559 fee tiers before the signature prompt ever appears; and a tracker that follows each swap from mempool to confirmation — the same states the transaction walks.

Every merge was beaten in: review on every path that moves value, fork tests against live chain state so tokens misbehave the way they actually misbehave, and rehearsals of the ugly cases — fee-on-transfer tokens, ERC-20s that return false instead of reverting, quotes going stale between preview and signature. The slippage check was fuzzed until it stopped being interesting.

GM SWAP runs in production today. Swaps route unattended, quotes track the chain block by block, and nothing reaches a signature prompt without a rate and a gas figure attached. When price moves against a pending swap, minimum-out reverts it and the tokens never leave the wallet; the only cost is the gas. Worn daily, in public.