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x402 Agent Payment Mandate Verifier
x402
x402 Agent Payment Mandate Verifier is a paid API for AI agents from x402.167-172-95-184.nip.io, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).
Validates an AI agent's payment mandate for correctness, authority, spend cap, replay nonce, resource binding, and receipt obligations before allowing autonomous spending.
Price / call$0.25
Success—
StatusUnknown
How this service works
Agent-commerce trust/audit API for x402 challenge correctness, receipts, replay/context binding, failed payout triage, mandate readiness, and MCP/A2A discoverability.
Output
Returns a JSON object with a numeric readiness score (0–100), a verdict (e.g. PASS, REVIEW, FAIL), a breakdown of detected vs. missing mandate obligations (spend cap, replay nonce, intended task, human authority, resource binding, expiry), a plain-English recommendation, the network, product name, and a Unix timestamp.
Example use cases
Pre-spend mandate safety check
“Before my agent makes any USDC payment, verify its mandate — agent ID is 'trading-bot-7', intent is 'buy market data', max amount is 5.00 USDC, recipient is '0x1234...5678', human approval is true, and receipt is required. Tell me the score and whether anything is missing.”
Replay attack protection audit
“Check if my agent's payment mandate has a valid replay nonce and expiry — the agent is 'agent-ops-42', intent is 'pay for API access', max spend is 1.00 USDC. I want to know if it's vulnerable to replay attacks before it goes live.”
Failed payout root cause triage
“My agent tried to make a payment and it failed — can you audit its mandate to figure out what went wrong? Agent ID is 'fulfillment-agent-9', intent is 'settle invoice', max amount is 10.00 USDC, no human approval was set. What obligations are missing?”
Technical details
Endpoint
POSThttps://x402.167-172-95-184.nip.io/mandate/verifyWhen to prefer
Use this endpoint when an AI agent is about to execute an autonomous payment and you need to verify the mandate is complete, properly scoped, and protected against replay attacks before funds move. It is specifically designed for the x402 agent-commerce protocol and understands its obligation model (nonce, expiry, resource binding, human authority). Prefer this over generic schema validators when you need a scored, actionable readiness verdict with specific missing-obligation identification.
Side effects
- Missing required fields (agent_id, intent, max_amount_usdc) returns a 400 validation error
- Invalid body type or HTTP method returns schema rejection
- Malformed USDC amount string may cause parsing failure
- Endpoint unavailable or nip.io DNS resolution failure returns network error
- Score of 0 with verdict FAIL if all mandate obligations are absent
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| nonce | string | |
| expiry | string | |
| intent | string | |
| agent_id | string | |
| resource | string | |
| recipient | string | |
| human_approval | boolean | |
| max_amount_usdc | string | |
| receipt_required | boolean |
Output
Schema · Response
{
"type": "json",
"example": {
"score": 75,
"network": "base",
"product": "Mandate Readiness Verifier",
"verdict": "REVIEW",
"detected": {
"spend_cap": true,
"replay_nonce": false,
"intended_task": true,
"human_authority": true,
"resource_binding": true
},
"timestamp": 1780000000,
"recommendation": "Do not let the agent spend until missing mandate obligations are bound into the request.",
"missing_obligations": [
"replay_nonce",
"expiry_or_window"
]
},
"description": "Agent-payment mandate readiness check: authority, scope, cap, recipient, expiry, nonce, resource binding, and receipt obligations."
}Tags
x402
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