Self-custody event contracts on an on-chain order book, resolved by the UMA oracle.
Per-trade fee
Polymarket
12 products in the catalogue, each on its own card. One vendor, several products, because a merged card could not be compared or priced: the halves have different buyers and different competitors.
Polymarket's Rust command line - MIT in the manifest, with no LICENSE file in the repo.
FreeOpen source
Order books, prices and order placement on Polymarket's matching engine.
Per-trade feeFree tier
Polymarket's keyless read API for trades, positions, holders and price history.
FreeOpen to US
Polymarket's own iframe widgets and livestream ticker, for putting live odds on a page.
FreeOpen to US
Polymarket's read-only catalogue of events, markets, series and tags.
FreeOpen to US
Polymarket's CFTC-designated US exchange — dollars, KYC, and no on-chain oracle.
Per-trade feeOpen to US
A keyless public gateway for reading, and a signed key behind KYC for trading.
Per-trade feeFree tierOpen to US
Official SDK for Polymarket US - installs as polymarket-us, unreleased since January.
FreeOpen sourceOpen to US
Official TypeScript client for Polymarket US - npm has shipped nothing since January.
FreeOpen sourceOpen to US
Polymarket's own unified Python SDK - sync and async, data through order signing.
FreeOpen source
Polymarket's own Python CLOB client - archived, and declared non-functional by its README.
FreeOpen source