# SendCheck

A free EVM address checker (check an address before you send) plus a per-call x402 verification API (USDC on Base — no account, no API key; the payment is the authentication).

The full machine-readable API documentation (endpoints, prices, payment flow, discovery links) lives on the API host:

https://api.pennyforge.org/llms.txt

Human docs: https://pennyforge.org — agent-facing API docs: https://pennyforge.org/pro.html#agents (mirror: https://sendcheck.surge.sh)

Markdown mirrors of the site pages (for agents reading the site as text):

- https://pennyforge.org/index.md — what SendCheck is, what it catches, Pro, FAQ
- https://pennyforge.org/pro.md — Pro purchase + the agent API section (endpoints, prices, signed service card, code example)