---
title: "Polymarket Sports & Esports API | 0xinsider"
description: "Build with 0xinsider's Polymarket sports and esports API: wallet grades, large trades, market flow and daily picks. REST, SDKs and MCP."
canonical: "https://0xinsider.com/developers"
last-updated: 2026-10-07
---

# Polymarket Sports & Esports API

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@3.6.1 (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