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Agent Tools Preflight Checker
x402
Agent Tools Preflight Checker is a paid API for AI agents from agent-tools-7936.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).
Verifies whether an x402 payment-gated endpoint is reachable, correctly configured, and within budget before an agent commits to paying
Price / call$0.001
Success—
StatusUnknown
How this service works
Primary-source tools for AI agents: verify before you pay, cite, or repeat.
Output
Returns a JSON object with a verdict (e.g. PAYABLE, OVER_BUDGET, INVALID), measured latency in seconds, the HTTP status code received, and a payment_required object detailing whether the x402 header is valid, the supported networks, price in USD, and asset symbol (e.g. USDC on Base).
Example use cases
Budget guard before paying an API
“Before my agent pays that weather API at https://weather-x402.example.com/forecast, can you do a preflight check with a GET request and make sure it costs less than $0.005?”
Validate a new x402 integration
“I just set up an x402-gated endpoint at https://myservice.example.com/api/data — can you verify it's returning a proper 402 with valid payment options when you hit it with a GET?”
Audit an x402 endpoint before citing it
“I'm about to recommend this paid data source at https://datasource-x402.example.com/records to my users — can you preflight it with a GET to confirm it's live, payable, and priced under $0.02?”
Technical details
Endpoint
GEThttps://agent-tools-7936.onrender.com/preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent is about to pay for an x402-gated API call and needs to confirm the endpoint is live, correctly configured, affordable within a stated budget, and returning valid payment metadata before committing any funds. Prefer this over blindly paying when budget controls or endpoint integrity matter.
Side effects
- Endpoint is unreachable — verdict may be INVALID or no response
- Endpoint does not return 402 — not a valid x402 service
- Price exceeds max_price_usd budget — verdict is OVER_BUDGET
- Malformed x402 payment header — valid field set to false in response
- Slow or timing-out upstream endpoint — high latency_s returned
- Missing required 'url' query parameter — request rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"verdict": "PAYABLE",
"latency_s": 0.95,
"http_status": 402,
"payment_required": {
"valid": true,
"options": [
{
"network": "eip155:8453",
"price_usd": "0.003",
"asset_symbol": "USDC"
}
]
}
}
}Tags
x402
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