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POLYMARKET APIMARKET DISCOVERY · NO KEY
Polymarket API reference
Market discovery data is public and needs no authentication. Orders go through the CLOB, signed in two layers: L1: the wallet signs an EIP-712 message; used to create or derive API credentials. Polymarket US is a separate API at api.polymarket.us.
GAMMA MARKETS ENDPOINT
GET /markets?closed=false&limit=2
Host: gamma-api.polymarket.com
200 OK, no auth header (7 OCT 2026)
[ { "question": "…", … } ]
AUTH
EIP-712 + HMAC
RATE LIMIT
15,000 req / 10 s per IP
WEBSOCKET
Yes
WHAT WE ADD
Each market carries its fee rate. Reading them is how we found a live 0.03 tier on sports markets that appears in no table Polymarket publishes.
SPONSORSHIP
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