Polymarket API

Polymarket is a prediction market on Polygon mainnet. Every market is a pair of YES/NO ERC-1155 tokens issued by the Conditional Token Framework (CTF), collateralized 1:1 in USDC. Off-chain CLOB matching, on-chain settlement, zero taker fees. Prices are in [0.00, 1.00] USDC; YES + NO ≈ 1.0 per market.

Before you write any API code — read the live docs first.

• Docs: https://docs.polymarket.com
• Official Python SDK: https://github.com/Polymarket/py-clob-client

Polymarket endpoints and auth flows have changed without notice. Prefer the official py-clob-client SDK over hand-rolled HTTP; it handles EIP-712 derivation, API credential management, and order signing. Only hand-roll when the SDK doesn't expose what you need.

Identifier model

You will juggle four distinct IDs — get them confused and queries silently return wrong data.