Preflight before paying any x402 endpoint
Preflight before paying any x402 endpoint: validates its 402 challenge (network, amount, asset, payTo, timeout, Bazaar declaration), prices it in USD, screens the payTo wallet (OFAC, wallet vs token contract) and shows real usage (Bazaar 30-day calls and unique payers). Budget check with max_price_usd. ok_to_pay / caution / do_not_pay. $0.003 USDC per call.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
466 msmedian answer time
$0.003listed price per call
$0.003price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://x402-agent-api.onrender.com/api/v1/x402-preflight
| Category | Company and compliance |
|---|---|
| Provider host | x402-agent-api.onrender.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 5 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.003 | 466 ms |
Example input (from the provider)
{
"body": {
"max_price_usd": 0.01,
"url": "https://x402-agent-api.onrender.com/api/v1/email-verify"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"max_price_usd": {
"description": "Your budget per call: a higher price makes the verdict do_not_pay.",
"exclusiveMinimum": 0,
"type": "number"
},
"method": {
"default": "auto",
"description": "How to request it: auto (default) tries GET, then POST with an empty JSON body.",
"enum": [
"auto",
"GET",
"POST"
],
"type": "string"
},
"url": {
"description": "The paid endpoint, e.g. https://api.example.com/v1/tool.",
"format": "uri",
"type": "string"
},
"via": {
"description": "Optional: the tool whose next_calls suggested this call (filled in for you).",
"maxLength": 64,
"type": "string"
}
},
"required": [
"url"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}