Live x402 buyer check: signed RLUSD evidence offer and catalog freshness (24 Sep 2026)
A dated operational check for agents and developers evaluating CSOAI's x402 evidence service.
Start with the free preview: RLUSD evidence preview returns point-in-time XRPL issuer and domain checks, with unmeasured fields disclosed. It is unsigned historical evidence, not a rating, reserve attestation, or guarantee.
Read the current offer: GET the RLUSD evidence resource without a payment header. On 24 September 2026 it returned HTTP 402. The PAYMENT-REQUIRED header decoded to the same object as the response body: x402 v2, exact on Base (eip155:8453), and 10,000 atomic units of six-decimal USDC (0.01 USDC). The offer-receipt extension carried an EdDSA JWS. Its signature verified against did:web:csoai.org#board-attestation-1 in the public DID document. The signed amount, asset, network, payTo and resource path matched the challenge; the request's asset query is outside that signed path. Offers expire, so fetch a fresh 402 before deciding whether to pay. The live catalog describes other evidence routes.
Do not use cached Bazaar terms as the offer: PayAI's public resource list returned six CSOAI entries in this check. Its RLUSD entry was last updated 7 September and still showed 20,000 atomic units (0.02 USDC), with no stored extension declaration. That is an older catalog observation, not today's price. Under x402's HTTP transport, read the provider's current PAYMENT-REQUIRED header, inspect its terms, then let an authorized client decide whether to submit a payment.
No payment was sent during this check. It verifies the free preview and signed challenge, not paid delivery, buyer acceptance, revenue, or search-engine indexing. The board, public root, and card verifier remain free. If a URL or verification step fails, post the exact case here for reproduction.