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[2.18.0] - 2026-06-08

Added — Hosted trading mode

Trading methods now work in hosted mode when pmxt_api_key is set on Polymarket or Opinion exchanges. Routes through trade.pmxt.dev/v0/* so orders go through PMXT's PreFundedEscrow custody.

  • pmxt.Polymarket(pmxt_api_key=..., private_key=..., wallet_address=...) and pmxt.Opinion(...) gain wallet_address and signer constructor kwargs
  • 10 existing methods (create_order, build_order, submit_order, cancel_order, fetch_open_orders, fetch_my_trades, fetch_balance, fetch_positions, fetch_order_book, fetch_order) work in hosted mode
  • New nested namespace: client.escrow.approve_tx(), deposit_tx(), withdraw_tx(), withdrawals()
  • New optional dependency group: pip install "pmxt[hosted]" (adds eth-account for the built-in EthAccountSigner)
  • Per-route EIP-712 typed-data validation (schema + economic match + post-sign recovery + low-s canonical)
  • 9 new hosted exception classes inheriting from existing PmxtError tree (InsufficientEscrowBalance(InsufficientFunds), etc.) so existing catch sites work in both modes

Changed (additive, no breaking changes)

  • fetch_balance() in hosted mode returns escrow USDC balance (not venue CLOB USDC). Same Balance shape, different source. See MIGRATION.md.
  • Position.outcome_label, entry_price, current_price, unrealized_pnl are now Optional[...] — venue-direct mode still populates them; hosted mode surfaces None where the server hasn't enriched.
  • Network requests in hosted mode never auto-retry on POST/PUT/DELETE (idempotency: built_order_id and cancel_id are single-use).

Not supported in hosted mode

  • fetch_closed_orders — use fetch_my_trades() instead
  • fetch_all_orders — use fetch_open_orders() + fetch_my_trades() separately
  • fetch_positions(with_mtm=True) — raises NotImplementedError