pmxt

The #1 unified API for trading across major prediction markets.
@samtinnerholm @martkiro

[pmxt @devpmxt]

RT @SamTinnerholm: Arbitrage scanner: https://t.co/bF9NwI8gRM by https://t.co/WI3z2C1PNf

Sign up and try it. if you take any positions, le…

[Samuel Tinnerholm @SamTinnerholm]

We just shipped a standalone CLI for PMXT.

Query, trade, and stream prediction markets from your terminal. Polymarket, Kalshi, Limitless -- one interface.

[Samuel Tinnerholm @SamTinnerholm]

@devpmxt’s historical order book database is 30+ TB

[pmxt @devpmxt]

We've temporarily paused parquet file uploads to https://t.co/alk85UIGQv while we sort out an issue. Uploads will resume soon, and we'll backfill anything we missed.

[pmxt @devpmxt]

Built with PMXT 🔥

[Samuel Tinnerholm @SamTinnerholm]

Built a tiny CLI for scanning prediction-market spreads.

It uses PMXT to match equivalent markets across Kalshi + Polymarket, streams live order books, and shows the live YES prices side-by-side.

Screenshot: French Open markets with live cross-venue spreads.

[Samuel Tinnerholm @SamTinnerholm]

Trump posted the US–Iran ceasefire deal at 21:50 UTC on May 23.

Polymarket had been pricing it for 7 hours and 32 minutes.

By the time the post hit, 85% of the move was already done.

[pmxt @devpmxt]

@conspyrosy @SamTinnerholm @binance @chainlink We’ve been thinking about it! We’re always open to PRs and would merge rust support without a doubt.

[pmxt @devpmxt]

This data is free using the PMXT API. Crazy others are charging hundereds of dollars for this...

[Samuel Tinnerholm @SamTinnerholm]

What the Polymarket book did around SpaceX Starship Flight 12 ignition.
In the hour before launch: 79¢ → 88¢ as confidence built. The minute it lifted off: 88¢ → 99¢, ask side vanished, market resolved YES.

[pmxt @devpmxt]

All archive data now live via API

[Samuel Tinnerholm @SamTinnerholm]

Remember when we dropped the full Polymarket order book archive? 30M+ rows per hourly dump, raw parquet files, everyone loved it

The problem: you had to download 500MB-1GB parquet files, write your own parser, reconstruct the book yourself from tick deltas

That's over. You can now query historical order books directly from the API. 4 lines of Python. 🧵

[pmxt @devpmxt]

Cooking 🍳

[Samuel Tinnerholm @SamTinnerholm]

Chainlink + Binance data coming to @devpmxt on Monday!

[pmxt @devpmxt]

@SamTinnerholm This is why cross-venue aggregation is so important 🤓

[Samuel Tinnerholm @SamTinnerholm]

Kalshi has the best price 44% of the time. Polymarket has it 42%. It's a coin flip. $22B or $15B, neither platform consistently beats the other on price. And the gap depends entirely on what you trade.

The category matters more than the platform.

[Samuel Tinnerholm @SamTinnerholm]

Kalshi just raised $1B at a $22B valuation. They claim 90% of U.S. prediction market activity. So they must have the best prices, right? We checked 1,812 liquid markets. Not even close.

[pmxt @devpmxt]

This is why a cross-venue aggregator is so important!!!

[Samuel Tinnerholm @SamTinnerholm]

"Prediction markets are efficient" is one of those things everyone says and nobody checks.
We checked.
Across 2,991 prediction markets, traders overpay ~50% of the time vs. the best available price.

[pmxt @devpmxt]

@HyperliquidX The unified SDK now covers the venue everyone's watching.

https://t.co/cnrCLQwDIx

[Samuel Tinnerholm @SamTinnerholm]

@HyperliquidX's first BTC outcome market did 3x the volume of Polymarket and Kalshi combined.

@devpmxt now supports it.

9 prediction markets. One SDK. Trade and fetch data from all of them in one line.

https://t.co/GFYwrnzR24

[pmxt @devpmxt]

@SamTinnerholm @HyperliquidX This is huge 🔥

[Samuel Tinnerholm @SamTinnerholm]

@HyperliquidX's first BTC outcome market did 3x the volume of Polymarket and Kalshi combined.

@devpmxt now supports it.

9 prediction markets. One SDK. Trade and fetch data from all of them in one line.

https://t.co/GFYwrnzR24

[pmxt @devpmxt]

@radina_nt @APompliano @Kalshi We're here to help 🫡

[pmxt @devpmxt]

Good work, @trylimitless!

[Limitless @trylimitless]

A core idea of the rebrand video was to align it with our $2 billion volume milestone

By the time we posted it, we already hit $3 billion

+$1 billion in <2 weeks

Send help

[pmxt @devpmxt]

@tom_doerr Hype!