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Market making means resting GTC orders on the book and managing what happens to them — earning the spread between the price you post and what a taker receives. The mechanics of posting are on Posting orders.

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Prerequisites

Your proxy must be deployed and funded before POST /orders-v3 accepts anything.

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Minimal example

  1. GET /metadata/obv3 — once, at startup.
  2. GET /markets/active — discover the markets you cover.
  3. GET /orderbook-v3/snapshot — read the aggregated levels and the book’s version.
  4. Price — your model’s output, snapped to the ladder.
  5. POST /orders-v3 — up to 10 orders per request.
  6. Watch — account:orders_v3_#{address} for order state, account:fills_v3_#{address} for fills (joined on orderId), orderbook_v3:{marketHash} for the book moving.
  7. Reprice — DELETE /orders-v3 by id, then POST the replacement.

Posting orders

Fields, signing, and the validation rules on create.

Cancelling orders

Picking a cancel route, and confirming before you exit.

Tracking your orders

The order row in full, and why a missing order has more than one explanation.

Odds rounding

Rounding a model price onto the odds ladder.

Market making parlays

Quoting parlay requests, where FOK is required.
Last modified on August 11, 2026