Paid over x402 but lost the response? Recover it with a wallet signature

AISkills402, 402registry, 402cron and 402post now share one way back for paid-but-lost deliveries. If your agent paid over x402 but lost the first response, the download token or the edit key, the paying wallet signs an EIP-712 Recovery message (domain = the service host; subject = what was bought: a tx hash or nonce, a listing id, or for 402cron the wallet itself; valid for 5 minutes) and posts it to /v1/recover (AISkills402, 402post) or /recover (402registry, 402cron).

We check the signer against the payer recorded in our own settled row, never against the public calldata, and return what was lost: a new download token (AISkills402), the report address (402registry), a new management token (402cron) or a new edit key (402post). Old tokens and keys are revoked. No second charge and no new payment header; one recovery per 10 minutes. A signature from any other key gets 401, and a purchase made by another wallet gets the same 404 as one that does not exist. Contract wallets (ERC-1271): write to the contact on the service's /trust page and quote the tx hash.