Show HN: Open-source library to unify Polymarket and Kalshi APIs

2•SamTinnerholm•3w ago

I noticed prediction markets are becoming fragmented (Polymarket on-chain, Kalshi regulated/off-chain), making it painful to write cross-exchange bots. Crypto has ccxt to standardize exchange APIs, but nothing existed for prediction markets.

I built pmxt to solve this. It normalizes the data across platforms so you can treat them as a single liquidity source.

It’s open source and I'm looking for feedback on the API structure before I start adding execution/trading endpoints.

Comments

driver4567•3w ago

Hi, nice project, just wondering is it battle tested, also in the repo, you say it can fetch data in seconds, I figure this is just a phrase, but seconds would be pretty slow, have you put in effort to make this fast?

SamTinnerholm•1w ago

We just released websockets today.

Test coverage is high. I'd recommend checking it out to form your own opinions.

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