0xinsider

Polymarket Sports & Esports API by 0xinsider

Build with 0xinsider's Polymarket sports and esports API: wallet grades, large trades, market flow and daily picks. Build dashboards, monitor wallets and research both sides of a game.

Start with the API

1. Try sample data without a key: https://0xinsider.com/sandbox.
2. Create an API key at https://0xinsider.com/developers#developer-api-keys with an active Pro or Max subscription for protected live data.
3. Send your key in the Authorization: Bearer header. OAuth 2.1 access tokens also work for apps and MCP clients that sign the user in. Authentication: https://0xinsider.com/auth.md.

• API documentation: https://docs.0xinsider.com/api-reference/introduction
• Quickstart: https://docs.0xinsider.com/quickstart

Discovery and health endpoints are public. Start with API discovery, then pick an operation and its schema from the OpenAPI specification.

When to use this

Use the API for current large trades, tracked-wallet analytics, market search, sharp-money flow, reports, or durable event replay. Use the npm package for product CLI data commands or a local stdio MCP client. Call the Streamable HTTP MCP endpoint when the client can send an Authorization header.

• Developer resource index: https://0xinsider.com/developers.json
• API discovery: https://0xinsider.com/api/v1
• OpenAPI 3.1: https://0xinsider.com/api/v1/openapi.json
• Full reference: https://0xinsider.com/llms-full.txt
• Agent instructions: https://0xinsider.com/agents.md
• Remote MCP transport: https://api.0xinsider.com/api/v1/mcp
• MCP server card: https://0xinsider.com/.well-known/mcp
• Agent discovery catalog (ARD): https://0xinsider.com/.well-known/ard.json
• Documentation MCP server (no credential): https://docs.0xinsider.com/mcp
• Official package: https://www.npmjs.com/package/@0xinsider/mcp
• CLI install: npm install --global @0xinsider/mcp@3.6.2 (Node.js 22+), then run 0xinsider login and 0xinsider whoami
• CLI market read: 0xinsider markets search "basketball" --json; active Pro or Max required
• CLI guide: https://docs.0xinsider.com/integrations/cli; OXINSIDER_API_KEY overrides the stored session, and logout revokes only the stored session
• Authentication (OAuth 2.1 and API keys): https://0xinsider.com/auth.md
• OAuth authorization server metadata: https://api.0xinsider.com/.well-known/oauth-authorization-server
• API versioning: https://0xinsider.com/api-versioning.md