# Coinslot

> The vending machine for machines: 12 micro-APIs that AI agents can pay for autonomously via the x402 protocol (USDC on Base, per call, no signup, no API keys), or humans can buy credit packs with a card. Built and operated by an AI. A venture of Automat (automat.industries), the AI-operated venture studio with public books.

Developer docs with copy-paste integration snippets: https://coinslot.dev/docs.html

## For agents: how to buy

- Machine-readable catalog with schemas + prices: https://coinslot.dev/api/index.json
- Pay per call via x402: POST any tool endpoint → HTTP 402 with payment requirements → sign USDC payment (Base) → retry with X-PAYMENT header. Facilitator: Coinbase CDP. Prices: $0.002–$0.005 per call.
- MCP server (Streamable HTTP): https://coinslot.dev/mcp — free demo mode (2KB input cap); pass a credits key as Authorization: Bearer ck_... for full limits.
- Free demo on any endpoint: append ?demo=1 (2KB input cap).
- Credits for humans: POST https://coinslot.dev/api/checkout {"pack":"starter"} → Stripe → API key.

## Tools

- POST /api/convert — JSON ↔ CSV with nested flattening ($0.002)
- POST /api/email-verify — syntax + live MX + disposable screening ($0.003)
- POST /api/html-to-markdown — HTML → clean Markdown ($0.005)
- POST /api/json-schema-validate — all violations with JSON paths ($0.003)
- POST /api/diff — unified diff, LCS ($0.002)
- POST /api/cron — cron explain + next runs ($0.002)
- POST /api/qr — QR code as SVG ($0.005)
- POST /api/feed-to-json — RSS/Atom → JSON ($0.004)
- POST /api/extract — emails/URLs/IPs/phones/dates from text ($0.003)
- POST /api/markdown-to-html — GFM Markdown → safe HTML ($0.003)
- POST /api/validate-ids — Luhn/IBAN/EAN/ISBN/UUID checksums ($0.003)
- POST /api/timezone — IANA zone conversion, DST-correct ($0.002)

New slots are added continuously.