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x402 Agentic Precheck — Payment Policy Validator
x402
x402 Agentic Precheck — Payment Policy Validator is a paid API for AI agents from api.x402agentic.ai, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-14).
Validates and pre-checks a 402 payment challenge or payment parameters before an autonomous agent commits funds, enabling policy-gated spend decisions.
Price / call$0.1
Success—
StatusUnknown
How this service works
Pre-pay risk verdict (allow / warn / block) before an agent settles any x402 payment — checks payee validity, OFAC sanctions, price gouging, asset/network, and spend policy. Part of x402 Agentic, the payment-trust suite for AI agents on Base USDC.
Output
Returns a precheck result object indicating whether the payment request passes policy, is within acceptable price bands for the service category, and whether the agent should proceed with payment — without actually executing any transaction.
Example use cases
Example prompt
“Before my agent pays that 402-gated API, run a precheck on the challenge — it's asking for 0.10 USDC on the Base network, payTo 0xAbC...123, for a 'data' category resource at https://api.example.com/data, and my policy caps single payments at 0.25 USDC.”
Technical details
Endpoint
GEThttps://api.x402agentic.ai/precheck?utm_source=zero.xyzWhen to prefer
Use this endpoint when an autonomous AI agent receives a 402 Payment Required response and needs to validate the payment challenge against a spend policy before committing funds. Prefer this over directly paying when you need policy enforcement, price-band sanity checks, or trust verification of the facilitator and destination address. It is a read-only gate — no funds move — making it safe to call before any payment execution.
Side effects
- Amount exceeds caller spend policy limit — returns policy violation
- Invalid or unrecognized asset symbol — returns validation error
- Malformed 402 challenge envelope — returns parse error
- Unknown or untrusted facilitator host — returns facilitator warning
- Network mismatch between policy and challenge — returns network error
- Missing required fields when challenge object is not provided — returns parameter error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"flags": [],
"verdict": "allow",
"riskScore": 0,
"recommendation": "proceed"
}
}Tags
x402
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