For builders

Verify real-world assets in one call

Query on-chain attestation history for any physical asset — real estate, art, commodities. Appraisers, legal/title verifiers, insurers, inspectors, custodians, and auditors sign every event. You verify.

No account or API key needed. Agents pay per call in USDC on Solana. The server returns 402 Payment Required with payment details — your agent pays and retries automatically.

Asset reliability score

$0.005

GET /api/x402/v1/assets/:assetAddress/score

Verify attestation transaction

$0.01

GET /api/x402/v1/verify/:txSignature

Proof package (underwriting-grade trust)

$0.05

GET /api/x402/v1/assets/:assetAddress/proof-package

View full API documentation →

Pricing

Asset score$0.005 / call

Verify transaction$0.01 / call

Proof package$0.05 / call

SettlementUSDC on Solana

Agent access via x402

No registration. Pay per call in USDC.

How it works

1Call any /api/x402/v1/* endpoint
2Server returns 402 with payment details and idempotency metadata
3Agent pays in USDC on Solana and includes X-PAYMENT header
4Server settles payment and returns data with X-PAYMENT-RESPONSE

Example — 402 response body

{
  "x402Version": 1,
  "accepts": [{
    "scheme": "exact",
    "network": "solana",
    "maxAmountRequired": "5000",
    "asset": "EPjFWdd5...Dt1v",  // USDC
    "payTo": "GkGbgb1a..."
  }],
  "paymentRequirements": [{
    "scheme": "exact",
    "network": "solana",
    "maxAmountRequired": "5000",
    "asset": "EPjFWdd5...Dt1v",  // USDC
    "payTo": "GkGbgb1a..."
  }],
  "extensions": {
    "payment-identifier": {
      "info": { "required": false }
    }
  }
}

Compatible with

Coinbase AgentKitx402 client SDKCustom agents

View x402 docs →