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402Signal Route Lookup
x402
402Signal Route Lookup is a paid API for AI agents from 402signal.com, paid per call via x402, $0.003/call, status down (last checked 2026-10-31).
Returns a live, probed x402 endpoint URL (or an honest miss) for a given URL or need, confirming whether the endpoint is currently alive and returning a proper 402 challenge.
Price / call$0.003
Success—
StatusDown
How this service works
Check a paid API before your agent pays. 402Signal compares the seller's current price, recipient, network and exact request with your budget and rules; for a qualifying offer it returns a signed decision to verify before your own wallet pays. Its open-source client checks the answer against requirements set before paying. $0.003 USDC on Base, Solana or Algorand, only for a qualifying offer; misses are free. Your agent keeps its wallet. No guarantee of accuracy, identity, delivery or refunds.
Output
A JSON object containing: the resolved URL, a live boolean, a health object with liveness status, HTTP status code (typically 402), last probe timestamp, latency in milliseconds, and whether a 402 challenge header is present. On an honest miss, the live field is false with no URL.
Example use cases
Discover live x402 payment endpoint
“I need a working x402 endpoint for checking account balances — can you query 402Signal with that need and tell me the URL, whether it's live, and how fast it responded?”
Verify x402 route before calling it
“Before my agent tries to call https://example.com/x402/balance, can you run it through 402Signal to confirm it's actually live and returning a proper 402 challenge right now?”
Agent selects healthiest x402 route
“My agent needs to pick an x402 data endpoint — use 402Signal to find a live one matching 'price feed' and give me the URL along with its latency and last probe time so I can pick the freshest one.”
Technical details
Endpoint
POSThttps://402signal.com/route?utm_source=zero.xyzWhen to prefer
Use 402Signal when your agent needs to discover or verify that a specific x402-gated endpoint is currently alive and serving a proper 402 payment challenge, especially before spending money on a call. It is the right choice over static directories when freshness and liveness confirmation matter, as it probes endpoints in real time and reports actual HTTP status, latency, and challenge presence. Prefer it when you have a candidate URL or a description of what you need and want a fail-closed, honest answer about reachability.
Side effects
- No matching live endpoint found — returns honest miss with live: false and no URL
- Input URL or need is malformed or missing — likely returns a 400 or validation error
- The probed endpoint is temporarily down — returns live: false with last known probe data
- Payment of $0.01 USDC fails or is not authorized — request is rejected (fail-closed behavior)
- Network timeout reaching the target endpoint — latency_ms reflects timeout, live: false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | |
| need | string | |
| networks | array | Payment networks the buyer can pay on, for example ["base"]. A hard filter on the seller's current offer. |
| max_price_usd | number | Largest seller price in USD the check may select. Unknown prices fail closed. |
| acceptance_sha256 | string | SHA-256 of the buyer's acceptance contract, fixed before payment. Requires require_route_binding=true, which signs it into the receipt; the check never evaluates it. |
| require_transparency | boolean | Require a durable leaf and signed checkpoint receipt on HTTP 200. Default false; require_route_binding=true also requires transparency. Receipt failure after settlement remains billed. Private replay records support bounded recovery of the original response; they are not long-term evidence storage. Keep your own copy outside public logs. |
| require_route_binding | boolean | Opt in to a signed v4 route binding; implies require_transparency even if false. Default false; ordinary requests keep v3. A ranked winner that cannot bind may fall through to the next already-probed selectable bindable candidate; 503 route_binding_unavailable only when none remain. wrapExactAuthorize reports state=binding_unavailable with keep_calling_route true; policy working, not a crash. Buyer verifies raw response JSON with a pinned log key and compares the current seller request and challenge before signing. Expiry or changed terms do not undo a settled checking fee. Guide: https://402signal.com/developers#route-binding |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://example.com/x402/balance",
"live": true,
"health": {
"live": true,
"status": 402,
"last_probe": "2026-08-29T22:00:00-04:00",
"latency_ms": 87,
"has_402_challenge": true
},
"status": 402,
"probed_at": "2026-08-29T22:00:00-04:00",
"latency_ms": 87,
"has_402_challenge": true
}
}Tags
x402
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