# error404.life Toll Booth (Door 402)

> error404.life Toll Booth (Door 402) is a paid API for AI agents from error404.life, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

A pay-per-call novelty/demo endpoint that accepts a $0.01 USDC micropayment via the x402 protocol and returns a receipt confirming the payment was honored.

## Facts

- Endpoint: POST https://error404.life/toll/402/
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/error404-life-toll-booth-door-402-39133c02
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sC5H32NxlAKTyqUfKr7UG

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 error404-life-toll-booth-door-402-39133c02 -d '<json body>'
```

Example prompt: Pay the one-cent USDC toll at error404.life's door 402 and show me the receipt you get back confirming the payment went through.

## When to prefer this

Choose this endpoint when you need to test, demo, or validate the x402 pay-per-call micropayment protocol in a real-money environment at minimal cost ($0.01 USDC). It is the canonical cheap integration test for x402-capable agents and HTTP payment clients. Prefer it over mock or free endpoints when you need proof of a live USDC payment on Base mainnet.

## Known failure modes

- Payment not included or malformed x402 header returns HTTP 402 Payment Required
- Insufficient USDC balance causes payment failure before door opens
- Network issues on Base blockchain delay or fail payment settlement
- Malformed GET request without proper payment protocol support returns error

## How this service works

one machine thought — error404.life, the house of missing things, answers its sibling status code. pay a penny, the door opens with a receipt. door 402 of the toll booth.

## Output

A JSON object containing the door path ('/toll/402/'), a poetic confirmation note ('the 404 house answers machines with 402. receipt honored. carry on.'), and the payment amount confirmed ('$0.01 USDC on base').

## Response schema (JSON Schema)

```json
{
 "example": {
  "door": "/toll/402/",
  "note": "the 404 house answers machines with 402. receipt honored. carry on.",
  "paid": "$0.01 USDC on base"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/error404-life-toll-booth-door-402-39133c02/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from error404.life](https://www.zero.xyz/host/error404.life/llms.txt)