First-price quickstart

Get a live Blocksize price in one short flow.

Claude and Cursor can call authenticated, read-only live market-data tools. ChatGPT can discover the correct Blocksize endpoint today; the live-price step uses the HTTP API until the public ChatGPT connector exposes live tools.

Live price in connector

Claude

  1. Add https://mcp.blocksize.info/anthropic/mcp/ as a custom connector.
  2. Sign in with Blocksize.
  3. Ask: Use Blocksize to get the latest BTC-USD VWAP and include the source timestamp.

The successful get_vwap call uses one included data credit and reports the remaining balance.

Live price in connector

Cursor

{
  "mcpServers": {
    "blocksize-live": {
      "url": "https://mcp.blocksize.info/cursor/mcp/"
    }
  }
}

Complete OAuth, then ask: Use Blocksize get_vwap for BTC-USD and report the source timestamp.

Discovery + HTTP live price

ChatGPT

Add https://mcp.blocksize.info/mcp/server/ for discovery and endpoint construction. For the live response now:

curl -sS \
  -H 'X-AGENT-ID: chatgpt-quickstart-0001' \
  'https://mcp.blocksize.info/v1/vwap/btc-usd'

Eligible new identities start with 50 live-data credits; otherwise the route returns its x402 payment challenge.

Claude connector details · Public MCP discovery guide · HTTP API reference