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The taker pays the fee on each fill. The maker pays nothing on markets with maker_fee_bps = 0.

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The schedule

GET /v1/markets reports each market’s schedule as taker_fee_bps and maker_fee_bps. Read it from there. It is the only source, and the matcher charges exactly what it says. On the cNGN futures, taker_fee_bps = 25 and maker_fee_bps = 0. The fee is 25 bps of notional, so 2.5 USDC a contract at any price. Fees are paid from the account’s USDC.

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Who is the taker

The taker is the order created later of the two on a fill. It is not a property of your account or your strategy.
Resting a quote does not make you the maker. If your order arrives after the one it matches against, you are the taker on that fill and you pay the taker fee. A bot that requotes often is usually the later order, so it is usually the taker.
To be sure you are the maker, set post_only.

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The worstFee bound

worstFee caps what a fill may charge you. If the fee would exceed it, the contract reverts with TM_FeeTooHigh and the fill does not happen.
  • It is per unit filled, not a total. On spot, the right bound is feeRate × price, so it changes with price. On futures, it is per contract, in USDC × 1e18.
  • Leave headroom above the schedule. Resting orders were signed under the old schedule and cannot be re-signed when it changes. Numo’s own clients sign 30 bps against a 25 bps schedule.
  • Do not sign 0 on a market with a taker fee. Every fill where you are the taker reverts, until the order expires.
See Authentication and signing for how to encode it, and Spot for a worked spot example.