Pmq MCP Server

pmq

Fail-closed execution and market data for Polymarket CLOB V2, in Python. Local signing (your keys never leave your process), exchange-confirmed fills only, fee-correct math, and deposit-wallet (POLY_1271) support that actually works in production.

pip install pmquant        # distribution name pmquant, import name pmq

(PyPI's similarity check reserves the bare name; the module you import is pmq, same pattern as beautifulsoup4/bs4.)

As of 2026-07-03 this is, to our knowledge, the only maintained Python layer combining local CLOB V2 signing, an exchange-confirmed fill contract, and working deposit-wallet (POLY_1271) auth. That claim is dated and falsifiable: the comparison table below names the alternatives and what each does instead; open an issue if it goes stale.

Why this exists

Polymarket cut over to CLOB V2 on 2026-04-28. V1-signed orders are rejected in production, the fee schedule is decided at match time, and the official client examples leave several traps undocumented. Every line of pmq was paid for with a real error in live trading:

• invalid amounts, the market buy orders maker amount supports a max accuracy of 2 decimals: the CLOB treats FAK/FOK buys as market orders. pmq routes them through the market-order builder with the correct rounding.
• no orders found to match with FAK order (HTTP 400, yet with an orderID): a clean no-fill, not an error. pmq returns an empty Fill instead of crashing or, worse, retrying blindly.
• CLOB shows balance: 0 while your pUSD sits on-chain: the balance endpoint ignores your funder parameter and derives the wallet from your EOA and signature_type. Funds in the Polymarket app's default wallet (an ERC-1271 deposit wallet) are only visible with signature_type=3.

The full write-up with reproduction details: docs/war-story.md.

Runs in production

The maintainer's own bot trades through this exact executor 24/7 with real money. Example receipt (2026-07-03): settlement transaction 0x387f5f09...100d88a8 on the CTF Exchange V2: a FAK market buy built by this library, matched and settled, with the builder code visible in the calldata. Additionally, a weekly canary workflow exercises the real endpoints and the installed client surface, and opens an issue by itself if Polymarket drifts.

pmq-doctor: diagnose your setup in one command

pip install pmquant && pmq-doctor --market <slug>

It checks, in order: the installed client surface (introspection), your derived EOA, the funder wallet on-chain (owner() and bytecode: is it a deposit wallet?), whether POLY_SIG_TYPE matches the wallet type, whether the CLOB actually sees your collateral (and if not, WHICH sig_type does), and the target market's minimum size and tick. Real output on a real deposit-wallet account:

If you landed here from "the order signer address has to be the address of the API KEY" or a CLOB balance of 0 with funds on-chain: this is the tool.

The contract: nothing is booked without exchange confirmation

reconcile(condition_id) cancels anything resting, verifies nothing stayed open, and returns (shares, usd, fees) from get_trades: the exchange truth, not your hopes.

At startup pmq introspects the installed py-clob-client-v2 against the API surface it was verified on, and refuses to trade on drift instead of sending orders through changed semantics.

Quickstart

Market data needs no keys:

import pmq

m = pmq.parse_market(pmq.get_market("btc-updown-15m-1783062000"))
book = pmq.get_book(m["token_a"])
bid, bid_sz, ask, ask_sz = pmq.best_bid_ask(book)
print(ask, pmq.band_ask_depth_usd(book, 0.90, 0.97))
print(pmq.fee(price=0.95, shares=100))          # taker fee in $, crypto rate

Execution (reads POLY_PRIVATE_KEY, POLY_FUNDER, POLY_SIG_TYPE from the environment):

from pmq import PolymarketExecutor, OrderUncertain

ex = PolymarketExecutor()                        # signature_type=3 for the app's deposit wallet
ex.require_collateral(5.0)                       # fail fast, with a diagnostic that names sig_type

try:
    fill = ex.buy_fak(token_id=m["token_a"], price_cap=0.95, usd=5.00)
except OrderUncertain:
    ex.reconcile(m["condition_id"], m["token_a"])   # exchange truth before anything else
else:
    if fill:                                     # book ONLY what matched
        print(fill.matched_shares, "shares at", fill.price, "order", fill.order_id)

sell_fak and limit_gtc follow the same contract. The buy path has carried live volume; treat the sell path as following the same documented semantics with less battle time.

The signature_type table nobody gives you

If collateral() returns 0 while the funds are visible on-chain on your funder address, your signature_type is wrong. Debug trick: eth_call owner() (0x8da5cb5b) on the funder; if it returns your EOA and the wallet bytecode is an ERC-1167 proxy, you want signature_type=3.

Comparison (2026-07-03, factual)

NautilusTrader is excellent if you want a full framework; pmq is the small library you embed in your own bot. pmxt is convenient if you accept routing writes through their backend; pmq exists for self-custody.

Builder code disclosure

pmq ships with the maintainer's public Polymarket builder code as default attribution inside signed orders (pmq.executor.DEFAULT_BUILDER_CODE). Its commission is set to 0/0: it never adds any fee to your orders. Attribution feeds Polymarket's builder program and funds this project at zero cost to you.

Opt out or replace it, one line either way:

PolymarketExecutor(builder_code=None)            # no attribution
PolymarketExecutor(builder_code="0xYOURS...")    # your own code

or set the POLY_BUILDER_CODE environment variable. (Same model as JKorf/Polymarket.Net; the official client defaults to zero attribution.)

MCP server (agents)

pip install "pmquant[mcp]" then run pmq-mcp (stdio). Read tools (market, book, taker_fee, account_collateral, account_trades) always exist. Trading tools (fak_buy, fak_sell, cancel_and_reconcile) are only registered when the operator sets PMQ_MCP_LIVE=1 in the server environment: an agent cannot talk its way past a tool that was never created. Every order is capped per call by PMQ_MCP_MAX_USD (default 10).

{
  "mcpServers": {
    "pmq": {
      "command": "pmq-mcp",
      "env": { "POLY_PRIVATE_KEY": "...", "POLY_FUNDER": "0x...", "POLY_SIG_TYPE": "3" }
    }
  }
}

Leave the POLY_* variables out entirely for a read-only market-data server.

Bot template

bot-template/ is a complete bot minus the strategy, for ANY market (politics, sports, crypto, culture): paper mode against real books with real fees, per-market budgets with fee headroom, poisoned-market reconciliation, consecutive-failure halt, disk-persisted daily loss halt, a systemd unit with RestartPreventExitStatus=42 so halts stay halted, and a lightweight phone dashboard. You implement watchlist() and decide(); the shipped demo strategy is an API illustration meant to be replaced.

Security posture

• Keys are read from the environment, used to instantiate the signer, and never logged. No custody, no backend, no telemetry, zero network calls besides Polymarket endpoints.
• Beware of the documented wave of fake "polymarket bot" repositories that steal private keys. Read the source: pmq is small on purpose.
• Fund the trading wallet with what you can afford to lose. Nothing here is financial advice; prediction-market access is restricted in some jurisdictions and compliance is on you.

License

MIT