PAYMENT_INVALID

The payment presented did not verify.

HTTP status	402
Group	x402
Retryable	No — sending it again changes nothing

What happened

Wrong network, wrong token, wrong amount, wrong recipient, or a malformed payload.

What to do

Compare your payment against the challenge you were served, fix it, and retry.

The problem document

Every error is application/problem+json (RFC 9457) with the same shape:

{
  "type": "https://docs.co-relayer.com/errors/payment-invalid",
  "title": "The payment presented did not verify.",
  "status": 402,
  "detail": "A sentence about this specific occurrence.",
  "instance": "req_01JB…",
  "code": "PAYMENT_INVALID",
  "retryable": false,
  "hint": "Compare your payment against the challenge you were served, fix it, and retry."
}

See the error model for what each member means and how to handle unknown codes.