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x402 Receipt Tier Verifier
x402
x402 Receipt Tier Verifier is a paid API for AI agents from x402.167-172-95-184.nip.io, paid per call via x402, $0.05/call, status down (last checked 2026-10-03).
Verifies and classifies agent receipt evidence into tiers (transport ACK, handler ACK, semantic reply, domain receipt, human approval) with a confidence score and completion recommendation.
Price / call$0.05
Success—
StatusDown
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: receipt tier (e.g. R3_SEMANTIC_REPLY), a numeric confidence score (0-100), the network (e.g. 'base'), a detected signals map showing which of transport_ack/handler_ack/domain_receipt/semantic_reply were found, a Unix timestamp, a human-readable recommendation, and a list of missing artifacts required before the task can be marked complete.
Example use cases
Example prompt
“Can you verify this receipt payload from my agent swarm and tell me what tier it is, whether the handler ACK and semantic reply are detected, and whether I'm missing anything before marking the task as done?”
Technical details
Endpoint
POSThttps://x402.167-172-95-184.nip.io/receipt/verify?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically determine whether an agent's task completion evidence meets a sufficient threshold to be marked done — particularly in multi-agent swarms where you need to distinguish between a bare transport acknowledgment and a semantically confirmed, domain-verified receipt. Prefer this over manual inspection when automating agent workflow state transitions.
Side effects
- Malformed or empty receipt payload returns a low score with all detected signals false
- Missing required acknowledgment layers results in a low tier classification with a 'do not mark done' recommendation
- Network field may be absent if receipt does not include chain context
- Ambiguous or partial receipt data may be classified conservatively at a lower tier than actual completion
- Payment failure (insufficient USDC) results in HTTP 402 before the endpoint is reached
Output
Schema · Response
{
"type": "json",
"example": {
"tier": "R3_SEMANTIC_REPLY",
"score": 72,
"network": "base",
"detected": {
"handler_ack": true,
"transport_ack": true,
"domain_receipt": false,
"semantic_reply": true
},
"timestamp": 1780000000,
"recommendation": "Do not mark done until public/domain artifact or independent verifier receipt is attached.",
"missing_for_done": [
"domain_receipt",
"verifier_receipt"
]
},
"description": "Receipt-tier verifier for agent swarms: classifies transport ACK, handler ACK, semantic reply, domain receipt, and human approval evidence."
}Tags
x402
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