A price is a promise. This is the receipt.
When software trades currencies on your behalf, you rarely see the price it actually got. CorridorProof turns a live quote and the real trade into one signed receipt that anyone can verify — showing the gap between what was promised and what happened. Checking the signature is a public-key operation, so you never have to trust the machine, or this site.
You don't need to be a trader. Pick two currencies and press Check price — each step unlocks the next, and every figure is read live when you ask, never pre-computed.
1Check a live price Start here
Choose any two currencies CorridorProof supports (from Textile's address book for Celo). The price is read live from Textile's market-makers the moment you ask — never from a cached table.
2Price both sides
Unlocks after step 1 — it uses the live price you just checked.
The fields below are your assumptions, not fixed answers — change them and re-quote. CorridorProof shows the price a market-maker would offer on both sides, and prints every step so you can argue with the number.
3Lock a firm quote
Unlocks after step 1. Firm quotes need a Textile key; this deployment runs preview only, so use step 1's live price to carry amounts into step 4.
Firm quotes bind an amount, an expiry and executable calldata. This deployment holds no Textile key, so it reports what Textile answers instead of inventing a quote.
4Record what settled
Unlocks after step 1. Carry the quoted legs across, or paste a settlement hash and the desk reads the amounts from chain.
Reading from the chain pulls the transfer amounts out of the transaction logs and refuses anything that is not a corridor fill. Hand-recorded figures are signed as claims, and the receipt says which it is.
5Prove the attribution tag
Every transaction this service builds carries the enrollment code as an ERC-8021 suffix. Paste any Celo hash to read the codes back from the chain.
6Verify any receipt
Paste a receipt from anywhere — including one exported here — and the signature is checked against the key embedded in it.
7Journal
Receipts issued here are listed below.