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Synthex Forge x402 Receipt Check
x402
Synthex Forge x402 Receipt Check is a paid API for AI agents from x402.synthexforge.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-23).
Verifies that a payment receipt satisfies a given offer, returning a signed attestation of validity for x402 micropayment flows on Base mainnet
Price / call$0.05
Success—
StatusUnknown
How this service works
Synthex Forge x402 Receive: 41 paid verification, attestation and governance endpoints (Ed25519 + SHA-256 signed artifacts) plus free verify/public-key/standard sibling routes. Paid routes answer HTTP 402 with an x402 v2 `payment-required` envelope (atomic USDC on Base mainnet, chain ID 8453). Free routes are declared with `security: []` per the x402scan discovery spec.
Output
Returns a JSON object with an `ok` boolean indicating whether the receipt is valid and satisfies the provided offer. On success, `ok` is true; on failure, `ok` is false, potentially with error details about the mismatch.
Example use cases
Gate API access on receipt validity
“Before delivering my premium API response, check this x402 receipt against the offer I posted — only proceed if the receipt checks out as a valid USDC payment on Base.”
Marketplace payment confirmation
“A buyer just sent me a payment receipt for a $0.05 USDC offer on my marketplace — can you verify the receipt is genuine and matches the offer terms before I ship the digital goods?”
Automated paywall enforcement
“My paywall server received an x402 receipt from a user trying to access a paid article; verify the receipt satisfies the original offer before I grant them access.”
Technical details
Endpoint
POSThttps://x402.synthexforge.com/v1/bureau/receipt-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to cryptographically verify that an x402 v2 payment receipt satisfies a specific offer before granting access to a paid resource. It is the right choice when your system acts as a payee receiving USDC on Base mainnet and needs an independent, signed attestation of receipt validity rather than doing on-chain verification yourself.
Side effects
- Receipt does not match the offer (ok: false)
- Malformed receipt or offer object causes a 400 error
- Payment was on the wrong chain (not Base mainnet, chain ID 8453)
- Expired or already-used receipt returns invalid
- 402 Payment Required returned if the caller hasn't paid the $0.05 USDC verification fee
- Network timeout or upstream signing service unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| offer | object | The advertised offer the receipt should satisfy |
| receipt | object | The payment receipt under test |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true
}
}Tags
x402
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