`invalid_exact_evm_payload_authorization_valid_before`

The payment authorization has expired, or expires within the next few seconds.


Reported by	the facilitator, during verify
Usually fixed by	the buyer

Cause

The authorization's validBefore timestamp is earlier than the facilitator's clock plus six seconds. The buyer sets it from the quote's maxTimeoutSeconds.

Fix

Buyer: sign a fresh authorization and send it straight away. Do not reuse one from an earlier attempt.
Buyer: check the system clock. A clock running behind produces authorizations that are already expired.
Seller: a very small maxTimeoutSeconds leaves no time to deliver the payment. Sixty seconds is the usual default.

About this reference

Causes are taken from the source of @x402/evm 2.31. Other facilitators and later versions may use the same code for slightly different checks. See all x402 errors.