DepthFeed

Order-book depth & history for Polymarket, Kalshi. Keyless demo, key for full access.

Documentation

Polymarket & Kalshi MCP server

Polymarket & Kalshi MCP Server

DepthFeed runs a remote Model Context Protocol (MCP) server, so Claude, Cursor, Codex, and ChatGPT can pull prediction-market order-book depth and price data mid-session — no SDK, no glue code. It is keyless to start: add the endpoint and your agent can query BTC Polymarket markets immediately, then drop in a key for everything else.

Start free — no cardRead the API docs

The DepthFeed MCP server is a remote Streamable-HTTP endpoint (https://api.depthfeed.com/mcp) that exposes Polymarket, Kalshi, and Limitless order-book data as Model Context Protocol tools. AI agents call tools like polymarket_search_markets and kalshi_get_orderbook to fetch live and historical depth as JSON, with the same plan gating as the REST API.

Polymarket & Kalshi MCP server at a glance

Endpoint

https://api.depthfeed.com/mcp

Transport

Remote MCP — Streamable HTTP

Auth

Keyless demo, or Bearer df_ key

Tools

11 read-only — search · order book · history · screener

Assets

7 — BTC · ETH · SOL · XRP · DOGE · BNB · HYPE

Timestamps

Millisecond observation time; venue-specific source stamps

Underlying price

Nearest preceding Binance reference when available

History

7/30/90-day windows + full archive (Desk)

Delivery

REST history + normalized live WebSocket frames

Resolution

Raw stored observations or ?interval= 1s–1d

What the MCP server gives your agent

Keyless to start, your key for everything

Add the endpoint with no key and your agent is on the demo tier — BTC Polymarket markets, top-of-book — so a one-click install works the moment it lands. Add a DepthFeed API key (Authorization: Bearer df_…) and the same session unlocks all 7 assets, Kalshi, Limitless, the full ladder, and deep history. Paid-only calls return a clear in-tool message, not an error, so the agent knows exactly what to upgrade.

Eleven read-only tools across three venues

Discovery and depth in one toolset: polymarket_search_markets / kalshi_search_markets / limitless_search_markets to find a market, then *_get_orderbook for the latest book and *_get_snapshots for history, plus screener for a cross-venue top-of-book view and whoami to read the session's plan. Every tool is read-only and exposes the same underlying DepthFeed records through tool-specific response envelopes.

Add it to Claude, Cursor, Codex, or ChatGPT

In Claude Code: `claude mcp add --transport http depthfeed https://api.depthfeed.com/mcp\`. In Cursor, VS Code, Claude Desktop, ChatGPT (Developer Mode), and OpenAI Codex, add the same URL as a custom/remote MCP server. Because it is a standard remote MCP endpoint, any MCP-capable client works — copy-paste snippets and one-click buttons are in the docs.

Sources & verification

Reviewed 2026-07-27

DepthFeed API documentation →
Polymarket real-time market data →
Kalshi order-book response guide →

Inspect the data before integrating

Start with a bounded sample, verify the fields and timestamps, then choose the API or research workflow that matches the job.

Questions, answered.

What is the Polymarket & Kalshi MCP server?

It's a remote Model Context Protocol endpoint (https://api.depthfeed.com/mcp) that lets AI agents — Claude, Cursor, Codex, ChatGPT — pull prediction-market order-book depth and price data as tools, without writing API code. The agent calls tools like kalshi_get_orderbook; DepthFeed returns the same JSON the REST API serves.

Do I need an API key to use the MCP server?

Which AI clients can use it?

Can I backtest Polymarket & Kalshi strategies with this data?

Can I cancel anytime?

Start backtesting Polymarket · Kalshi · Limitless on real depth.

Free to start, no card. Upgrade when your strategy is ready for the full book.

Start free