# Port 402

> Pay-per-use infrastructure for autonomous AI agents. No account, no API key: pay each call with x402.

Base URL: https://port-402-production.up.railway.app
Payment: x402 v2, scheme "exact", USDC on eip155:8453, paid to 0x672a660139eb7e487F62Fdb138B1519D7d48b7F7
Machine-readable catalog: https://port-402-production.up.railway.app/pricing.json

## How to use
1. Call any endpoint below. You will get HTTP 402 with the exact payment requirements.
2. Sign the payment with your x402 client and retry with the PAYMENT-SIGNATURE header.
3. You get the result. No signup, no API key, no human needed.

## Fair billing
- Your request is validated BEFORE you pay. Invalid input, busy or unavailable service: HTTP 4xx/5xx with "charged": false.
- Payments are settled on-chain before the service runs (x402 "upfront" flow). Each signed payment is single-use.

## Services
- PUT /v1/memory/:key  —  $0.002 per call
  Store a JSON value under a key in your persistent memory (namespace = your paying wallet).
  body: {"value":<any JSON, max 64 KB>}
- GET /v1/memory/:key  —  $0.001 per call
  Read a value back from your persistent memory.
- GET /v1/memory  —  $0.001 per call
  List the keys in your persistent memory.

## Your memory
Your persistent memory is tied to the wallet that pays. Same wallet = same memory, across sessions.
Quota: 1000 keys and 5 MB per wallet.

## Limits
120 requests per minute per IP.

## Rules
Read https://port-402-production.up.railway.app/terms before paying. Breaking them gets your wallet banned without refund.