Agent-native market data: pay per call in USDT0 on X Layer, verify every price against a published key.
Agent-native market data with cryptographic receipts. Agents pay per call via x402
($0.002 for a VWAP signal, $0.01 for a signed price proof) in USDT0 on X Layer — no
API key, no account, no invoice, gasless for the payer. Every premium call returns an
ed25519-signed price attestation anchored to the on-chain settlement tx that paid for
it, independently verifiable against our published key. Forge one and the verifier
rejects it. Registered as ASP #5774 on OKX.AI; listing review pending.
<p>Built end-to-end during the hackathon:</p><p>• Live ASP at <a href="https://okx.iomarkets.ai">https://okx.iomarkets.ai</a> — Docker + Caddy, HTTPS, health green</p><p>• x402 v2 paid routes via the OKX SDK: get_vwap ($0.002), get_price_proof ($0.01),</p><p> settling USDT0 on X Layer (eip155:196) through the OKX facilitator</p><p>• Market data from QuestDB fed by a live OKX trade-feed ingester (auto-reconnecting)</p><p>• The differentiator: ed25519 price attestations anchored to the settlement txid,</p><p> plus a published trust anchor at /v1/proof/pubkey and an MCP manifest that</p><p> advertises it so agents can pin the key before paying</p><p>• A standalone verifier (pnpm verify) that pins the published key — it ACCEPTS a real</p><p> attestation and REJECTS a forgery signed with any other key</p><p>• Registered on-chain as ASP #5774 and submitted for listing (review pending)</p><p>• Real money, not a testnet: a buyer agent pays the seller ASP per call in USDT0,</p><p> settled on X Layer, verifiable on the explorer</p><p>Two things we found and fixed by testing rather than assuming:</p><p>• The verifier originally checked signatures against the pubkey embedded in the</p><p> payload — circular, and it accepted a forgery claiming BTC = $1. It now pins the</p><p> independently published key.</p><p>• The paid proof tier never actually emitted a proof: the settlement extension read an</p><p> AsyncLocalStorage context opened after the payment middleware, so it silently</p><p> returned nothing. Buyers paid and got a placeholder. Fixed and verified live.</p>
<p>Bootstrapped — no external funding.</p>