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P0 Agent Economy Index – x402 Echo / Payment Verification
x402
P0 Agent Economy Index – x402 Echo / Payment Verification is a paid API for AI agents from x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).
Verifies and echoes back a decoded x402 micropayment header, confirming scheme, asset, network, timing windows, and settlement details for a $0.001 USDC call on Base
Price / call$0.001
Success—
StatusUnknown
How this service works
An open index of the machine-to-machine (agent) economy. x402 routes: ranked discovery over the live x402 service market, every indexed service scored by real 30-day calls and paying-wallet bounds, with a receipt naming the snapshot hash and scoring revision. /economy routes, for Tempo MPP, Virtuals ACP, Olas, Masumi, ERC-8004 agent registries, Solana agent registries, Base agent contracts and MCP servers (Official MCP Registry): each protocol's published figures (agent or server counts, transactions or payment events; payers and USD volume only where the source publishes them: payers for x402 and Tempo MPP, USD volume for x402 and Virtuals ACP), each with its unit, window and source; units differ, so totals are not summed. L402 and per-service MPP listings are not covered.
Output
Returns a JSON object with ok status, timestamp, and a full decoded breakdown of the x402 payment header including: scheme validation, decoded flag, network (eip155:8453 / Base), timing window (validAfter, validBefore), x402 version, asset match, payTo match, and amount match. Also returns settlement details: payer wallet address, network, success flag, facilitator (e.g. coinbase-cdp), and transaction hash. Payment payload fields include signature, authorization (to, from, nonce, value, validAfter, validBefore), and accepted asset/network/amount/scheme.
Example use cases
Debugging a failed x402 payment flow
“I'm building an x402-enabled service and my payment isn't being accepted — can you echo my payment header through the x402 echo endpoint and tell me whether the scheme, asset, timing windows, and payer address all check out?”
Confirming settlement before delivering a service
“Before I release the data to the requester, I need to confirm their x402 USDC payment actually settled on Base — can you verify the payment signature, check the transaction hash, and confirm the facilitator marked it successful?”
Auditing a batch of x402 receipts
“I need a decoded receipt for this x402 payment — give me the payer wallet, the nonce, the valid-after and valid-before timestamps, and whether the amount matched the $0.001 USDC requirement on Base.”
Technical details
Endpoint
GEThttps://x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/x402-echo?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically verify that an x402 micropayment header is valid and settled on Base before fulfilling a service request. It is specifically designed for x402 protocol validation on Base/eip155:8453 with USDC, and provides a full decoded breakdown of the payment authorization — prefer it over generic payment status checks when you need to confirm scheme, timing windows, asset match, and payer identity in one atomic call.
Side effects
- Missing or malformed payment-signature header returns an error with decoded: false
- Expired payment (outside validAfter–validBefore window) returns withinWindow: false
- Asset mismatch (wrong token contract) returns assetMatches: false
- PayTo address mismatch returns payToMatches: false
- Amount mismatch (e.g. wrong USDC amount) returns amountMatches: false
- Network mismatch (not eip155:8453) returns network validation failure
- Settlement failure from facilitator returns settle.success: false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"ts": "2026-10-04T12:00:00.000Z",
"route": "/x402-echo",
"checks": {
"scheme": "exact",
"decoded": true,
"network": "eip155:8453",
"validAfter": "2026-10-04T11:59:00.000Z",
"validBefore": "2026-10-04T12:05:00.000Z",
"x402Version": 2,
"assetMatches": true,
"payToMatches": true,
"withinWindow": true,
"amountMatches": true
},
"header": {
"name": "payment-signature",
"bytes": 824,
"encoding": "base64-json"
},
"settle": {
"payer": "0x7EF12BE6000000000000000000000000000000aa",
"network": "eip155:8453",
"success": true,
"facilitator": "coinbase-cdp",
"transaction": "0xabababababababababababababababababababababababababababababababab"
},
"payment": {
"payload": {
"signature": "0xcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcd",
"authorization": {
"to": "0xECa891e34b3E5873181Fb779672564E198C55354",
"from": "0x7EF12BE6000000000000000000000000000000aa",
"nonce": "0xefefefefefefefefefefefefefefefefefefefefefefefefefefefefefefefef",
"value": "1000",
"validAfter": "1791115140",
"validBefore": "1791115500"
}
},
"accepted": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0xECa891e34b3E5873181Fb779672564E198C55354",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453"
},
"x402Version": 2
}
}
}Tags
x402
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