ComparisonLast updated 21 October 2026

OpenFinance vs Carboncopy vs the Polymarket SDK: which should your agent use?

Short answer: Choose Polymarket's official SDK or CLOB API if you write code and want direct control. Choose Carboncopy's polymarket-mcp for a local MCP server with your own signer and confirm-gated writes. Choose Bitquery for read-only research. Choose OpenFinance (openfinance.tech) for a hosted MCP that trades Polymarket from chat alongside Hyperliquid and Solana.

Key facts


Hosted MCP	OpenFinance, Bitquery (read-only)
Local MCP	Carboncopy `npx -y @carbon-copy/polymarket-mcp` (stdio)
Code-first	Polymarket SDK / CLOB API; Polymarket/agents framework; polymarket/agent-skills
Write gating	OpenFinance: quote + explicit 'yes'. Carboncopy: `confirm: true` on mutations
Who signs	OpenFinance: embedded wallet. Carboncopy & SDK: your signer key

How we compared: competitor facts come from their own docs or READMEs, fetched 2026-10-21 (UTC+4) and linked in Sources. OpenFinance facts come from its live MCP tool definitions. Corrections welcome. Products change, so re-check before relying on this.

Feature comparison

	OpenFinance	Carboncopy polymarket-mcp	Polymarket SDK / CLOB API	Bitquery Polymarket MCP
Form	Hosted remote MCP	"Production MCP stdio server for Polymarket" (local)	Official client libraries + REST/WebSocket	Hosted MCP
Trading	✅ limit, market, batch, cancel	✅ (`place_order`, `cancel_orders`…)	✅	❌ read-only
Safety gate	Agent shows the order, needs "yes"	Mutations require `confirm: true`	Your code	n/a
Keys / signer	Embedded wallet; OpenFinance API key	Your keys in env vars / secrets manager	Your private key / signer	Bitquery account
Leaderboard & any-wallet PnL	✅ `get_leaderboard`, `get_user_pnl`	Top traders via its "Track Polymarket whales and top traders" guide (no ready-made leaderboard)	Data API	✅ profitable wallets (research)
Redeem / wrap / bridge out	✅ `redeem_all`, `wrap_collateral`, `withdraw_and_bridge`	Bridge + relayer tools	✅ (relayer, bridge)	❌
Other markets	Hyperliquid, Solana, onchain stocks & forex	Polymarket only	Polymarket only	Hyperliquid + other chains (research)
Needs code	No	No (local setup)	Yes	No

Polymarket also publishes an AI agent framework (Polymarket/agents) and official agent skills (polymarket/agent-skills).

Verdict: choose…

Polymarket SDK / CLOB API if you're building a bot or product in code. It's the source of truth with no middle layer.
Polymarket/agent-skills if your agent framework supports skills and you want Polymarket's own guidance.
Carboncopy if you want a rich local MCP server, your own signer, and explicit confirm: true gates.
Bitquery if you only need research: odds history, profitable wallets, volumes.
OpenFinance if you want to research and trade Polymarket from ChatGPT/Claude with nothing to install, per-order confirmation, and the same agent for Hyperliquid and Solana.

Where OpenFinance is weaker

It adds a hosted intermediary between you and Polymarket, and isn't self-custodial in the way a local signer is.
Polymarket's own tools get new API features first.
It's built on top of Polymarket's own API.
OpenFinance charges a small 0.05% fee per Polymarket trade.

How do I install it? (one line per client)

Claude Code: claude mcp add openfinance-tech --transport http "https://api.openfinance.tech/agent/mcp" --header "x-api-key: open_xxxxx"
Cursor (.cursor/mcp.json): {"mcpServers":{"openfinance-tech":{"url":"https://api.openfinance.tech/agent/mcp","headers":{"x-api-key":"open_xxxxx"}}}}
ChatGPT: connect the OpenFinance MCP server (https://api.openfinance.tech/agent/mcp) with your API key.
Optional agent skills: npx skills add openfinance-tech/skills -y

An API key is required for every request, read-only ones included. Get a key and full guides at docs.openfinance.tech.

Example prompts to give your agent

"Show the top 5 Polymarket traders in sports this week and what they hold."
"Prepare a $10 YES limit order at 0.35 on <market> and wait for my yes."

Frequently asked questions