The API Marketplace
for AI Agents
No keys. No signup. Just pay per request in USDC and call any API from your agent.
How It Works
The x402 protocol makes API payments native to HTTP.
Connect via MCP or HTTP
Add api.calyx.market/mcp to your MCP config, or call any endpoint directly.
Receive a 402, Pay in USDC
No signup required. Your agent pays per request using the x402 protocol on Base L2.
Get the Data
The gateway verifies payment and proxies your request to the upstream API in milliseconds.
API Catalog
Five production-ready APIs, pay per request.
Web Scraping
Extract structured JSON from any URL. Schema-guided extraction returns exactly the shape you need.
Deep Research
Multi-source synthesis with citations. Tavily search + web scraping + LLM synthesis in one call.
Financial Data
Unified enrichment for stocks, crypto, and companies. Real-time prices, fundamentals, news sentiment.
Audio Transcription
Timestamped transcription from any audio or video URL. Powered by Whisper.
Code Execution
Run Python, JS, or Bash in an isolated sandbox. Returns stdout, stderr, and artifacts.
Integrate in minutes
Two requests. That's all it takes.
# 1. Make the request (you'll get a 402)
curl -X POST https://api.calyx.market/v1/scrape \
-H "Content-Type: application/json" \
-d '{"url": "https://news.ycombinator.com"}'
# 2. Retry with payment header
curl -X POST https://api.calyx.market/v1/scrape \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <your_x402_payment>" \
-d '{"url": "https://news.ycombinator.com", "schema": {"title": "string", "points": "number"}}'