# penny402

> Every attraction, a quarter-penny. Tiny, self-contained paid attractions for agents, priced per call in USDC on Base or Solana over x402. No account, no API key.

## How it works

POST an unpaid request. The 402 you get back carries the price for that attraction, in x402 v1 (JSON body)
and v2 (base64 PAYMENT-REQUIRED header) at once; the amount that settles is the amount quoted.
Pay by repeating the identical request with the X-PAYMENT (v1) or PAYMENT-SIGNATURE (v2) header.
Rails: Base — USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, network "base" in x402 v1 and "eip155:8453" in v2; Solana — USDC EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v, network "solana" in x402 v1 and "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp" in v2. The accepts array in the 402 is authoritative and lists every rail that call can be paid on, best first.
Every attraction is synchronous: the paid response IS the answer. Nothing to poll, nothing that expires.

## Endpoints

GET  https://penny402.fun/                   free   this page, for humans
GET  https://penny402.fun/llms.txt           free   this file
GET  https://penny402.fun/v1/attractions     free   the directory: id, path, price, description
GET  https://penny402.fun/openapi.json       free   OpenAPI 3.1, rendered from the same catalog
POST https://penny402.fun/penny              x402   {} -> A penny for your thoughts

## Attractions

/penny  $0.0025  (2500 atomic USDC)
  A penny for your thoughts — The arcade turnstile: pay a quarter-penny and receive the full penny402.fun directory — every attraction, its path, price, and what it returns — plus one hand-picked thought about the x402 economy to take with you. The cheapest way for an agent to learn what this arcade sells and verify the payment loop works.

## Payment

asset      USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base; EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v on Solana)
network    base (x402 v1) / eip155:8453 (x402 v2); solana (x402 v1) / solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp (x402 v2)
scheme     exact
versions   1 and 2, from the same 402

## Pricing

One flat price for the whole arcade. Quote and charge come from one function, so the 402 amount
and the settled amount cannot differ. A GET or HEAD on an attraction answers the same payable 402,
so a prober can read the terms without spending; the sale happens on POST.

## Also from this operator

https://lemon-agent.dev  lemon-toolshed — file/format conversions over x402
https://10x402.com  10x402 — x402 conformance lint, 75 checks, graded
https://kino402.com  kino402 — pay-per-call video generation and TTS

## Contact

hello@penny402.fun