# x402 Endpoint Probe

> x402 Endpoint Probe is a paid API for AI agents from biosfera.46-62-215-147.sslip.io, paid per call via x402, $0.001/call, status down (last checked 2026-10-03).

Probes an x402-protected HTTP endpoint to check reachability, validate its 402 payment challenge, and retrieve accepted networks, assets, price, and pay-to address — without making any payment.

## Facts

- Endpoint: GET https://biosfera.46-62-215-147.sslip.io/o/x402-probe?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-endpoint-probe-17b6a80f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QZufquAnh_2RfcVPGRpi2

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-endpoint-probe-17b6a80f
```

Example prompt: Before I pay anything, can you probe this x402 endpoint — https://example.46-62-215-147.sslip.io/o/some-api — using a GET request to check if it's reachable, what it charges, which networks and assets it accepts, and what address I'd be paying?

## When to prefer this

Use this endpoint whenever you need to inspect an unfamiliar x402-protected API listed in the Bazaar or elsewhere before committing to pay for it. It is the right choice when you want to verify reachability, validate the 402 challenge structure, discover accepted payment networks and assets, confirm the exact price, or retrieve the pay-to address — all without spending any funds. Prefer this over blindly calling a paid endpoint when you are doing pre-payment due diligence or debugging a failed payment flow.

## Known failure modes

- Target URL is unreachable or times out — returns error indicating no 402 challenge received
- Target URL does not return a valid 402 response — challenge validation fails
- URL parameter missing or malformed (must be HTTPS and 4-900 characters) — returns validation error
- Target endpoint returns unexpected HTTP status (200, 500, etc.) — reported as non-402 response

## How this service works

Use before paying an unfamiliar x402 endpoint listed in the public Bazaar: one unpaid probe tells you if it is reachable, returns a valid HTTP 402 challenge, which networks and assets it accepts, the exact price, the pay-to address and the latency. Does not pay the target.

## Output

Returns whether the target URL is reachable, whether it responds with a valid HTTP 402 challenge, the accepted blockchain networks and assets, the exact price, the pay-to wallet address, and the round-trip latency — all without executing any payment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "pattern": "^https://[^\\s]{4,900}$"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-endpoint-probe-17b6a80f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from biosfera.46-62-215-147.sslip.io](https://www.zero.xyz/host/biosfera.46-62-215-147.sslip.io/llms.txt)