> ## Documentation Index
> Fetch the complete documentation index at: https://docs.numofx.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Fees

> Who pays, how much, and the worstFee bound you sign

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

## The schedule

[`GET /v1/markets`](/api-reference/endpoint/get) 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.

## 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.

> [!WARNING]
>
> 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`](/matching/order-types#post-only).

## 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](/signing) for how to encode it, and
[Spot](/spot#fees-follow-arrival-order-not-identity) for a worked spot example.


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