chain-context-mcp

A lightweight MCP server that gives AI agents and Claude Desktop live crypto market data — current price, 24h stats, and top movers — over the Model Context Protocol. Pay-per-call ready (x402), with a free tier for discovery.

Live demo server: https://chain-context-mcp.hadi-ai.workers.dev

Why

Most MCP data servers are read-only wrappers that 403 from cloud IPs or need API keys. This one runs on Cloudflare Workers, uses a keyless public source, edge-caches responses, and is built to be paid per call by autonomous agents via x402 — machines paying machines, no signup.

Tools

Tool	Args	Returns
get_token_price	id (e.g. bitcoin, ethereum, or BTC)	USD price + 24h % change
get_market_snapshot	id	price, 24h volume, high, low, open, change
get_trending	—	top major-token movers by 24h % change

Connect from Claude Desktop

Add a Streamable-HTTP MCP server pointing at the URL above, then ask:

"What's the price of solana right now?"

Quick test

curl -s -X POST https://chain-context-mcp.hadi-ai.workers.dev \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"get_token_price","arguments":{"id":"ethereum"}}}'

Run / deploy your own

npm install
npm test                 # pure-logic tests (gating)
npm start                # local Node server on :8788
wrangler kv namespace create MCP_USAGE   # paste id into wrangler.toml
wrangler deploy          # deploy to Cloudflare Workers

Monetization

• Free tier: FREE_CALLS_PER_DAY per client (KV-tracked), consumed only on a successful response.
• x402: set X402_PAYTO to your USDC wallet; calls beyond the free tier return HTTP 402 with payment requirements, and a valid X-Payment header is served. (Plug in an x402 facilitator to verify settlement.)

License

MIT