polymarket-mcp
An MCP (Model Context Protocol) server that exposes PolyMarket prediction-market data via four MCP tools: market details, market listing with pagination, current prices, and historical price/volume data over selectable timeframes. It connects to the PolyMarket API using an API key and provides human-readable responses with stated handling for common API error conditions (rate limiting, invalid keys/markets, timeouts, malformed responses).
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Likely uses env vars for the PolyMarket API key (improving secret hygiene), but the README does not state logging behavior, secret redaction, TLS requirements to the upstream API, or fine-grained authorization controls. No mention of validating untrusted tool inputs beyond expected schema constraints.
⚡ Reliability
Best When
When an agent platform supports MCP and you want a local MCP server wrapper around PolyMarket’s API to retrieve market data with structured tool calls.
Avoid When
When you need a hosted, managed service with a published SLA, automatic scaling, or a documented REST/SDK interface instead of MCP tools.
Use Cases
- • LLM agents retrieving current prediction market prices and implied probabilities
- • Agents summarizing market context (category, resolution date, description) for research or forecasting workflows
- • Monitoring/analysis use cases that need historical price and volume trends
- • Interactive market discovery with filtering and pagination
Not For
- • Payment/transaction execution (read-only market data interface)
- • Use as a public unauthenticated endpoint (authentication to PolyMarket API is required by design)
- • Production-grade use without confirming the upstream PolyMarket API’s response/limits and the MCP server’s actual runtime behavior
Interface
Authentication
README indicates use of API credentials through env vars (.env with Key and Funder). No OAuth flow or explicit OAuth scopes described.
Pricing
No pricing information for the MCP server itself is provided; costs would depend on PolyMarket API usage (not documented here).
Agent Metadata
Known Gotchas
- ⚠ The README includes a snippet for Claude Desktop config under an 'Development/Unpublished' header; it may not reflect the production-ready configuration format.
- ⚠ Rate limits are referenced (429) but no specific retry-after or backoff strategy is documented.
- ⚠ Tool outputs are shown as formatted text blocks rather than explicit machine-readable JSON structures, which can complicate agent parsing.
Alternatives
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Scores are editorial opinions as of 2026-03-30.