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SeeSaw is a social prediction-market platform: users create and trade on prediction topics, vote in polls, and compete on leaderboards. The SeeSaw Open API gives AI agents and third-party integrations a clean, read-only view of that world — plus the authenticated user’s own portfolio. The same capability set is exposed on two faces, served by the same backend:

MCP server

https://api.seesaw.fun/mcp — 14 tools over Streamable HTTP, ready for Claude Code, Cursor, VS Code, and any MCP client.

REST API

https://api.seesaw.fun/open/v1/* — the same 14 capabilities as plain REST endpoints, documented by OpenAPI.

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What you can do

  • Search and browse topics — prediction markets and polls, by keyword or ranking.
  • Read market data — option probabilities, price history, volume, traders.
  • Read the discussion — comments with the author’s position attached.
  • Look up users — public profiles with track records (never their finances).
  • Check leaderboards, zones, and contests — including World Cup pick’em standings.
  • See your own account — balance, open positions, settlements, and created topics of the key owner.
Everything is read-only in this beta. Write access (trading, posting) is planned behind scoped permissions — see the changelog.

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Design at a glance

  • One personal API key (sspat_…) in the Authorization: Bearer header — for both faces, no OAuth dance, no token exchange.
  • snake_case fields, string decimals (never floats), RFC 3339 UTC timestamps, opaque cursor pagination.
  • Users are identified by handle; every resource carries a human-visitable url.
  • Generous rate limits per key, with standard X-RateLimit-* headers.

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Start here

Quickstart

Get a key, connect an agent, run your first query — in about five minutes.

MCP tools

The 14 tools, what they return, and when to use which.