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error404.life Toll Booth (Door 402)
x402
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.
Price / call$0.01
Success—
StatusUnknown
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').
Example use cases
Testing x402 payment client integration
“I just built an x402 payment client and want to make sure it works — can you hit error404.life's toll endpoint, pay the one cent USDC fee on Base, and confirm I get a valid receipt back?”
Demoing micropayment-gated API access
“I want to show someone how pay-per-call APIs work using the x402 protocol — can you access the error404.life toll booth, pay the penny, and read me what the response says?”
Verifying agent payment capability end to end
“Check whether my AI agent setup can actually spend USDC autonomously — go knock on door 402 at error404.life, pay the 0.01 USDC toll, and tell me what receipt you get back.”
Technical details
Endpoint
POSThttps://error404.life/toll/402/When to prefer
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.
Side effects
- 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
Output
Schema · Response
{
"example": {
"door": "/toll/402/",
"note": "the 404 house answers machines with 402. receipt honored. carry on.",
"paid": "$0.01 USDC on base"
}
}Tags
x402
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