PMXT

What it is

A unified client for prediction markets shaped deliberately like ccxt - its README describes itself as "the ccxt for prediction markets" - with one interface over many venues, Python and TypeScript SDKs, a CLI, an MCP server and a hosted API behind them. MIT-licensed, created in January 2026, 2,157 stars.

The supported-venue row in the README lists Polymarket, Polymarket US, Kalshi, Limitless, Probable, Baozi, Myriad, Opinion, Metaculus, Smarkets, Hyperliquid, Gemini Titan, SuiBets, Rain and Hunch. That is a wider net than anything else in this catalogue casts, and the width is the point: fetch_markets, fetch_positions, fetch_balance and create_order are the same calls whichever venue you construct.

There are two ways to run it, and they are different products wearing one name.

• Hosted. pip install pmxt or npm i pmxtjs, a pmxt_api_key from the PMXT dashboard, and your calls go through PMXT's infrastructure - which is also what sells the subscription: deep historical data, cross-exchange market matching, order book snapshots, and a smart order router the site says picks the best price across venues.
• Self-hosted. pip install pmxt-core or npm install pmxt-core, construct a venue client with no PMXT key, and the SDK spawns a local service that talks to venue APIs directly with your own venue credentials. The documentation's sentence for this mode is that venue credentials stay on your machine.

Availability

Nothing here is geographically gated by PMXT that we could find: the package installs anywhere, the free hosted tier needs an email and a key rather than an identity check, and the restrictions that bite are the venues' own - Limitless declines US order placement, Kalshi and Polymarket US want a verified account. The card's flags describe the client, not the venues behind it.

One term is worth reading off the pricing page rather than guessing at: all plans are for personal use only, with enterprise access on request. That is on the page in those words, and it is the sort of clause a team discovers after building on the free tier.

Pricing

The library is free and MIT. The hosted Data API is a subscription, and the figures below were read off the pricing page on 2026-09-19 with the monthly toggle selected; an annual toggle takes 20% off.

• Free - $0, 25,000 credits a month, 60 requests a minute, 5 WebSocket streams.
• Starter - $29.99 a month, 250,000 credits, 300 requests a minute, 20 streams.
• Pro - $99.99 a month, 1,000,000 credits, 1,000 requests a minute, 100 streams.

One REST call costs one credit and one WebSocket message costs 0.1, which is the number that decides whether a streaming strategy fits a tier: a book that ticks ten times a second exhausts the free month in about seven hours of streaming.

Trading fees are not PMXT's. Each fill is charged by whichever venue executed it.

Markets & resolution

PMXT resolves nothing and settles nothing; it routes to venues that do, and the answer differs per venue - a Polymarket position settles in USDC on Polygon against an on-chain oracle, a Kalshi position settles in dollars against the exchange. The card carries crypto because the venues it can currently write to are the on-chain ones.

The abstraction is where the risk is. A unified market model has to flatten events, markets and outcomes across fifteen venues that disagree about all three, and what reaches your code is PMXT's translation. The README's own hierarchy - event, market, outcome - is the shape everything is bent into, and a venue that does not fit it fits it anyway.

Integrations

Python (pmxt), TypeScript (pmxtjs), a CLI (@pmxt/cli), an MCP server (@pmxt/mcp) for Claude, Cursor and other agent clients, and copy-paste React trading widgets advertised on the site. Credentials in self-hosted mode are the venue-native ones: a Polygon private key and optional proxy address with a signature type for Polymarket, an API key plus RSA private key for Kalshi, an API key plus an EIP-712 signing key for Limitless.

There is also a dome-to-pmxt codemod that rewrites calls from the Dome API, which tells you who PMXT thinks it is competing with.

Limitations

It stopped shipping in July. 322 releases on PyPI between 2026-01-03 and 2026-07-18, then nothing; the last commit on main is the same day. For a library whose whole job is to track fifteen moving APIs, two months of silence is the most important fact on this card. It is not archived and the issue tracker is open - but see the next paragraph for what that tracker looks like.

1,236 open issues and 77 open pull requests, counted through the GitHub search API on 2026-09-19 with is:issue is:open rather than the REST field, which would have added the pull requests together with them. That is an extraordinary number for a repository eight months old, and whatever it is - automation, a flood of small reports, a backlog nobody triaged - it means the tracker cannot tell you whether your problem is known.

Hosted is the default path, and the default path has a key in it. The quickstart puts a pmxt_api_key and a private_key in the same constructor. The hosted-trading documentation does now set out the split that makes the claim coherent - the SDK signs the typed-data payload locally and that step never leaves your process, and pmxt_api_key is described as a service-role credential that can read hosted data and forward signed orders but cannot move funds on its own. What remains is that this is the vendor describing its own design: the page states the contracts are unaudited as of 2026-06-09, with an audit report to be linked when one exists. Self-hosted mode is where you stop taking it on description. Re-read on 21 September 2026.

Writes are narrower than reads. Hosted trading covers Polymarket, Opinion and Limitless; Kalshi writes need self-hosting. A card that says fifteen venues is telling you about data.

Nothing here has been run by us, including the self-hosted path, the credit accounting and the smart order router.

Alternatives

ccxt is the older, larger and far more heavily used abstraction, with a prediction namespace covering seven venues and a weekly release rhythm - less coverage of this niche, much more evidence of being maintained.

For one venue done properly, the official SDKs are narrower and usually more current: polymarket-client, polymarket-us-python, kalshi-python-sync and limitless-sdk.

If what you want is data rather than trading, adjacent and finfeedapi sell cross-venue feeds without asking for a signing key at all.