# Old Colony Web x402 Self-Test Payment

> Old Colony Web x402 Self-Test Payment is a paid API for AI agents from api.oldcolonyweb.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Executes a real $0.002 USDC x402 v2 payment on Base as a self-test, returning a simple JSON response as proof of successful payment settlement.

## Facts

- Endpoint: POST https://api.oldcolonyweb.com/v1/payment/self-test?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/old-colony-web-x402-self-test-payment-5e0c6c9b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7X-RKdjJM850Ohet8iQJj

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 old-colony-web-x402-self-test-payment-5e0c6c9b -d '<json body>'
```

Example prompt: Run a live x402 v2 self-test payment of $0.002 USDC on Base — I want to confirm the full settlement flow works and see both the JSON result and the PAYMENT-RESPONSE header.

## When to prefer this

Use this endpoint when you need to verify that an x402 v2 payment flow is working end-to-end with a real USDC transaction on Base, especially during agent integration setup or debugging. It is the lowest-cost way to confirm x402 settlement without performing any real data operation. Do not use it for actual data retrieval, email validation, DNS lookup, or any other functional task.

## Known failure modes

- Insufficient USDC balance — payment rejected before handler is reached
- Ambiguous charge (e.g. network timeout mid-flight) — do not retry blindly as funds may have already settled
- Invalid x402 payment header format — 402 Payment Required response returned
- Base network congestion causing delayed or failed on-chain settlement
- Malformed request body — 400 Bad Request if required fields are missing

## How this service works

For $0.002, test a real x402 v2 exact USDC payment on Base and receive an intentionally simple JSON handler result. The successful final HTTP response and PAYMENT-RESPONSE header (not the body alone) are evidence of the x402 settlement flow. No refund, wallet-balance check, blockchain-finality guarantee, variable tip, data lookup or downstream action. Do not retry an ambiguous charge blindly.

## Output

A simple JSON object confirming the handler executed, plus a PAYMENT-RESPONSE HTTP header that together serve as evidence of a completed x402 v2 USDC payment settlement on Base. No data lookup, refund, or downstream action is triggered.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "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/old-colony-web-x402-self-test-payment-5e0c6c9b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.oldcolonyweb.com](https://www.zero.xyz/host/api.oldcolonyweb.com/llms.txt)