Blocksize Capital Agentic Payments

Institutional-grade market data for AI agents, with two public integration layers:

• Public remote MCP discovery server: free symbol discovery, pricing inspection, and document search
• Paid HTTP API: live market data protected by x402 settlement or wallet-credit drawdown
• Anthropic-safe MCP beta: authenticated read-only market data with daily user credits

Public URLs

• Homepage: https://mcp.blocksize.info/
• Remote MCP URL: https://mcp.blocksize.info/mcp/server/
• Anthropic-safe MCP URL: https://mcp.blocksize.info/anthropic/mcp/
• Claude connector docs: https://mcp.blocksize.info/claude-connector
• MCP manifest: https://mcp.blocksize.info/mcp/manifest.json
• OpenAPI JSON: https://mcp.blocksize.info/openapi.json
• Swagger UI: https://mcp.blocksize.info/docs
• Quickstart: https://mcp.blocksize.info/quickstart/remote-mcp
• Prompt examples: https://mcp.blocksize.info/prompt-examples
• Privacy policy: https://mcp.blocksize.info/privacy
• Support: https://mcp.blocksize.info/support
• MCP Registry metadata: https://mcp.blocksize.info/server.json

Product Shape

1. Public remote MCP discovery server

The remote MCP server is meant for directory listings and fast evaluation in ChatGPT Developer Mode, Cursor, Claude MCP clients, Smithery, Glama, and other Streamable HTTP clients.

It exposes only read-only discovery tools:

• search_pairs
• list_instruments
• get_pricing_info
• search
• fetch

This public surface does not execute paid live market data calls directly.

2. Paid HTTP market data API

The paid HTTP API is the production data path for live access:

• GET /v1/vwap/{pair}
• GET /v1/bidask/{pair}
• GET /v1/fx/{pair}
• GET /v1/metal/{ticker}
• GET /v1/batch

Free discovery endpoints:

• GET /v1/search
• GET /v1/instruments/{service}
• GET /health

Payment modes:

• x402 proof per request
• Wallet-credit drawdown via X-AGENT-WALLET

3. Anthropic-safe MCP beta

The Anthropic-safe MCP surface is mounted at /anthropic/mcp/ and exposes read-only tools only:

• search_pairs
• list_instruments
• get_credit_balance
• get_vwap
• get_bid_ask
• get_fx_rate
• get_metal_price

Live market data tools use server-side daily credits keyed to authenticated user identity. The default allowance is 50 credits per user per UTC day and can be changed with ANTHROPIC_DAILY_CREDITS or per-user entitlement overrides.

For local beta testing, set ANTHROPIC_BETA_TOKENS to a JSON object mapping random bearer tokens to user ids. For public Claude custom connectors, set ANTHROPIC_AUTH_PROVIDER=clerk, keep ANTHROPIC_ENABLE_BETA_TOKENS=false, and configure the Clerk env vars in [.env.example](/Users/johannfocke/Documents/Antigravity/Agentic Payments/.env.example). The Claude OAuth metadata endpoints are served at /.well-known/oauth-protected-resource/anthropic/mcp/ and /.well-known/oauth-authorization-server/anthropic/mcp.

4. Advanced local MCP

For builders who want the full tool surface inside a local MCP client, this repo also contains the advanced local MCP server in [src/mcp_server.py](/Users/johannfocke/Documents/Antigravity/Agentic Payments/src/mcp_server.py).

That mode is intended for direct builder integrations and requires local credentials.

Coverage

• 6,362 enabled crypto VWAP pairs
• 2,365 enabled shared bid/ask instruments
• 3 enabled FX pairs
• 5 metal tickers

Local Development

uv venv
source .venv/bin/activate
uv pip install -e ".[dev]"

Run the HTTP server:

uvicorn src.resource_server:app --port 8402

Run the advanced local MCP server:

python -m src.mcp_server

Tests

.venv/bin/python -m pytest tests/ -q

Listing Artifacts

• Official registry file: [server.json](/Users/johannfocke/Documents/Antigravity/Agentic Payments/server.json)
• Smithery metadata: [docs/smithery_manifest.json](/Users/johannfocke/Documents/Antigravity/Agentic Payments/docs/smithery_manifest.json)
• Claude submission packet: [docs/gtm/claude_connector_submission.md](/Users/johannfocke/Documents/Antigravity/Agentic Payments/docs/gtm/claude_connector_submission.md)
• Claude plugin package: [claude-plugin/blocksize-market-data](/Users/johannfocke/Documents/Antigravity/Agentic Payments/claude-plugin/blocksize-market-data)
• Claude plugin submission packet: [docs/gtm/claude_plugin_submission/README.md](/Users/johannfocke/Documents/Antigravity/Agentic Payments/docs/gtm/claude_plugin_submission/README.md)
• Internal submission runbook: [docs/gtm/directory_listing_runbook.md](/Users/johannfocke/Documents/Antigravity/Agentic Payments/docs/gtm/directory_listing_runbook.md)

License

MIT