# aizamon x402 Ping — Payment Rail Verification

> aizamon x402 Ping — Payment Rail Verification is a paid API for AI agents from aizamon.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

A $0.01 hello-world endpoint that proves an x402 micropayment wallet stack can settle, returning a signed Ed25519 receipt attestation and an echo response as verifiable proof of payment.

## Facts

- Endpoint: GET https://aizamon.com/x402/v1/ping?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aizamon-x402-ping-payment-rail-verification-673fc3df
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PVqXD2in6l83fult-CWHn

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 aizamon-x402-ping-payment-rail-verification-673fc3df
```

Example prompt: Run a $0.01 x402 ping against aizamon.com to verify my wallet can settle — I need the signed Ed25519 receipt back as proof that my payment rail actually works.

## When to prefer this

Choose this endpoint when you need a cheap ($0.01), low-risk way to verify that an x402 wallet or payment stack can successfully settle a USDC micropayment and receive a cryptographically signed Ed25519 receipt as proof. Ideal for smoke-testing new integrations, debugging payment rail issues, or onboarding agents that need to demonstrate payment capability before being trusted with higher-value operations.

## Known failure modes

- Insufficient USDC balance in wallet — payment fails before endpoint is reached
- Malformed x402 payment header — server rejects with 402 before returning attestation
- Network timeout — no receipt returned, settlement state unknown
- Invalid or expired payment credentials — authentication rejected
- Wallet not x402-compatible — protocol handshake fails

## How this service works

Proves an x402 client can finish 402, sign, settle, and read the result on Base. Optional ?echo= is returned. The body includes a signed Ed25519 payment attestation you can verify against the published receipt key. $0.01 USDC. This is the rail canary, not market data.

## Output

Returns a signed Ed25519 receipt attestation confirming the $0.01 USDC micropayment settled successfully, plus an echo of the request — giving the caller cryptographically verifiable proof that their x402 wallet stack can pay.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "echo": {
       "type": "string",
       "description": "Optional string echoed back"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "sku": {
       "type": "string"
      },
      "result": {
       "type": "object"
      },
      "protocol": {
       "type": "string"
      }
     },
     "additionalProperties": true
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "sku": "SKU_AG_PING_01",
  "result": {
   "ping": {
    "ok": true,
    "echo": "pong",
    "txHash": "0x…"
   },
   "product": "x402 Ping — prove the rail"
  },
  "protocol": "x402"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aizamon-x402-ping-payment-rail-verification-673fc3df/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aizamon.com](https://www.zero.xyz/host/aizamon.com/llms.txt)