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The Facilitator Service keyless trial lets you settle real x402 payments without a Circle account. Facilitator Service creates a seller account for your payout address (payTo) on your first /settle call and keeps settling payments until you hit the trial limit.

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Seller proof

With no API key to authenticate keyless requests, Facilitator Service relies on a seller proof: an EIP-712 signature from the key controlling payTo. The proof shows Facilitator Service that you own the payTo address. See Sign a seller proof for how to construct one.

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The trial allowance

Each payTo has its own trial allowance on each supported blockchain, with testnet and mainnet counted separately. Each /settle call counts against that allowance until it’s exhausted, at which point /settle responds with HTTP 403 registration_required. To continue settling, claim your seller account.

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Facilitator Service seller accounts

A seller account is the record Facilitator Service keeps for a payTo. It tracks payment history and, during the keyless trial, how much of the trial allowance you’ve consumed. Facilitator Service creates one automatically the first time you settle a payment for a new payTo. A new seller account is unclaimed. It stays unclaimed until you bind it to a Circle account, at which point /settle accepts your Circle API key for that payTo and the trial allowance no longer applies. Payment history carries over. See Claim your seller account for the procedure. If you don’t have a Circle account yet, create one in Circle Console.