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

No, to start. The endpoint is keyless by default and maps to the demo tier (BTC Polymarket, top-of-book), so a one-click install works immediately. Add a DepthFeed API key to unlock all assets, Kalshi, Limitless, the full order-book ladder, and deep history — the exact same plan gating as the REST API.

Which AI clients can use it?

Any MCP-capable client. It's tested with Claude Code, Claude Desktop, Cursor, VS Code (Copilot agent mode), ChatGPT (Developer Mode connectors), and OpenAI Codex. In Claude Code it's one command: claude mcp add --transport http depthfeed https://api.depthfeed.com/mcp. Other clients add the same URL as a remote/custom MCP server.

Can I backtest Polymarket strategies with this data?

Yes — that's what it's for. You get the full historical order book to replay a market and size fills against the liquidity that was actually there, then run the backtest in your own stack. Because history and the live stream share one JSON format, the code you backtest with also trades live.

Can I cancel anytime?

Yes. Paid plans are month to month and the free Explorer tier needs no card to start. Cancel anytime from the dashboard.

Polymarket MCP server

Polymarket MCP Server

DepthFeed runs a remote Model Context Protocol (MCP) server, so Claude, Cursor, Codex, and ChatGPT can pull Polymarket 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.

The DepthFeed MCP server is a remote Streamable-HTTP endpoint (https://api.depthfeed.com/mcp) that exposes Polymarket 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 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: Epoch-ms exchange + receive, per snapshot
Underlying price: Binance spot/futures, joined per snapshot
History: 7/30/90-day windows + full archive (Desk)
Delivery: REST API + live WebSocket, identical JSON
Resolution: Every change, or ?interval= 30s–1d downsample

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 marked read-only and returns the identical JSON envelope as the REST API.

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.

Start pulling polymarket mcp server

Free Explorer tier, no card. Full bid/ask depth and the underlying price on every snapshot, over a REST API and a live WebSocket stream.

Start free — no card Read the API docs

Questions, answered.

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