Public Remote MCP

Blocksize Remote MCP Quickstart

Public remote discovery endpoint: https://agentic-payments-production.up.railway.app/mcp/server/

What this public remote server is for

The public remote MCP exposes free discovery and documentation tools: instrument search, supported instrument lists, pricing inspection, and document-style search/fetch. Live paid market data remains available through the x402-protected HTTP API and the advanced local MCP setup.

ChatGPT Developer Mode

OpenAI’s current docs say developer mode supports remote MCP servers over Streamable HTTP. In ChatGPT, enable Developer mode under Settings, then create or add an app pointing at the remote MCP URL above.

Reference docs: Developer mode and remote MCP overview.

Cursor

Cursor’s MCP docs say Streamable HTTP servers can be configured with a URL. Add this to .cursor/mcp.json or ~/.cursor/mcp.json:

{
  "mcpServers": {
    "blocksize-discovery": {
      "url": "https://agentic-payments-production.up.railway.app/mcp/server/"
    }
  }
}

Anthropic Messages API

Anthropic’s MCP connector docs say remote servers must be publicly exposed over HTTP and support Streamable HTTP or SSE. Use the public MCP URL in the mcp_servers array:

{
  "mcp_servers": [
    {
      "type": "url",
      "url": "https://agentic-payments-production.up.railway.app/mcp/server/",
      "name": "blocksize-discovery"
    }
  ]
}

Any Streamable HTTP Client

If your agent runtime supports remote MCP over Streamable HTTP, point it at the same URL: https://agentic-payments-production.up.railway.app/mcp/server/.

Paid Data Access

For live paid market data, use the REST API documented in Swagger and OpenAPI JSON. The public pricing and payment model are documented in the Pricing Guide and Agent Manual.

Advanced Local MCP

Advanced builders who want the full MCP tool surface can run the local server from the repository:

uv venv
source .venv/bin/activate
uv pip install -e ".[dev]"
python -m src.mcp_server

The local MCP flow requires Blocksize credentials and is intended for direct builder integrations, not anonymous public directory installs.