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AgentIndex x402 URL Probe
x402
AgentIndex x402 URL Probe is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-29).
Probes a public URL to detect whether it is protected by an x402 paywall, and returns paywall metadata including price, network, and payment address.
Price / call$0.001
Success—
StatusUnknown
How this service works
Probe any public URL and report if it is an x402 paywall - price, network, payTo, scheme. Shop paywalls before you spend. Try GET /probe/sample.
Output
Returns a JSON object indicating whether the URL is reachable and x402-gated, including: the URL itself, a boolean is_x402 flag, HTTP status code, price in USDC, payment address (pay_to), network (e.g. 'base'), payment scheme, and x402 protocol version.
Example use cases
Pre-flight paywall check before calling
“Before I call https://api.example.com/live-prices, can you probe it to see if it requires an x402 payment, and tell me the price in USDC and the recipient wallet address?”
Discover payment terms for unknown endpoint
“I found this API at https://data.agentindex.world/search — can you check if it has an x402 paywall and what network and scheme it uses before I commit to paying?”
Validate x402 support on custom deployment
“I just deployed my service at https://myservice.io/api/report — can you probe it to confirm it's correctly returning x402 paywall info, including the HTTP 402 status and version?”
Technical details
Endpoint
GEThttps://x402.agentindex.world/probe?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to discover whether a specific URL is protected by x402 before deciding to pay for it, or when you want to extract payment metadata (price, wallet, network, scheme) without actually executing a payment. Prefer this over generic HTTP probing tools when x402 protocol-specific fields like pay_to, network, price_usdc, and x402_version are needed.
Side effects
- URL is unreachable or times out — reachable: false returned
- URL does not implement x402 — is_x402: false with actual HTTP status
- Malformed or non-HTTP URL provided — validation error
- URL redirects in a way that obscures paywall detection
- x402 metadata missing or incomplete on the target server
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://x402.shizu.me/weather?lat=48.85&lon=2.35",
"pay_to": "0x217e5Fe265EB78b29067bF8324ef03a7D8e167C4",
"scheme": "exact",
"is_x402": true,
"network": "base",
"reachable": true,
"price_usdc": 0.004,
"http_status": 402,
"x402_version": 1
}
}Tags
x402
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