# x402 Server Probe

> x402 Server Probe is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Performs an end-to-end probe of an x402-enabled server, testing discovery, status, available tools, reliability, and OpenAPI spec retrieval.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/server-probe
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-delx-ai-a6aa1da2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RptnfZIvpWcxxhWCqzKA_

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 api-delx-ai-a6aa1da2 -d '<json body>'
```

Example prompt: Run a full probe on this x402 server at https://api.example.com — check its discovery endpoint, current status, available tools, reliability, and OpenAPI spec, and give me a summary of what you find.

## When to prefer this

Use this endpoint when you need to programmatically audit or integrate with an x402-enabled server and need a single call that covers discovery, status, tools, reliability, and OpenAPI in one shot — rather than manually hitting each sub-endpoint separately. Ideal before onboarding a new x402 provider or verifying an existing one is functioning correctly.

## Known failure modes

- Target server is unreachable or returns a non-200 status, resulting in a connectivity failure report
- Target is not a valid x402 server and does not respond to x402 discovery requests
- OpenAPI spec is absent or malformed, resulting in a partial probe result
- Rate limiting or payment failure causes the probe call itself to fail
- Server responds to some probe steps but times out on others, resulting in partial data

## How this service works

Probe an x402 server end-to-end: discovery, status, tools, reliability, and OpenAPI.

## Output

Returns a structured report covering the x402 server's discovery metadata, operational status, list of exposed tools, reliability indicators, and OpenAPI specification — giving the agent a complete picture of what the server offers and whether it is healthy.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string"
  },
  "timeout": {
   "type": "integer",
   "maximum": 15,
   "minimum": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "checks": [
    {
     "url": "https://api.delx.ai/.well-known/x402",
     "name": "x402_discovery",
     "error": "",
     "status": 200,
     "reachable": true
    }
   ],
   "tool_count": 10,
   "check_count": 5,
   "resource_count": 20,
   "reachable_count": 5
  },
  "tool_name": "util_x402_server_probe"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-delx-ai-a6aa1da2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)