Markdown API — Pay Per Call with USDC on Base

markdown API

Fetch a URL and convert its main content to clean, LLM-ready Markdown. Strips nav/ads/sidebars. Options: output_format (markdown|text|json), css_selector, max_length, include_links, include_images. Part of the x402 Gateway — $0.002 per call, settled in USDC on Base. No accounts, no API keys: agents pay per request via the x402 protocol.

How payment works

Send a POST to https://x402.freeq.one/tools/markdown without a payment header and the API replies 402 Payment Required with an x402 challenge (payTo address, USDC amount, Base network). A paying agent signs the USDC payment and retries with the PAYMENT-SIGNATURE header (base64 JSON payment payload) — settlement is verified on-chain in seconds and the API response returns with a PAYMENT-RESPONSE receipt header.

Example call

curl -X POST https://x402.freeq.one/tools/markdown \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com/article", "options": {"max_length": 20000}}'

Browse every pay-per-call API on the all APIs page, or inspect the machine-readable service card and OpenAPI spec.