> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chainstack.com/llms.txt
> Use this file to discover all available pages before exploring further.
# approveBuilderFee | Hyperliquid exchange
> Approves a builder fee for a specific builder address. This allows the builder to charge fees on orders placed through their interface.
You can only use this endpoint on the official Hyperliquid public API. It is not available through Chainstack, as the open-source node implementation does not support it yet. See [Hyperliquid methods](/docs/hyperliquid-methods) for the full availability breakdown.
This endpoint requires signature authentication. See our comprehensive [Authentication via Signatures guide](/docs/hyperliquid-authentication-guide) for implementation details.
Approves a builder fee for a specific builder address. This allows the builder to charge fees on orders placed through their interface.
## Parameters
### Required parameters
* `action` (object, required) — The action object containing:
* `type` (string) — Must be `"approveBuilderFee"`
* `hyperliquidChain` (string) — Chain identifier
* `maxFeeRate` (string) — Maximum fee rate the builder can charge
* `builder` (string) — Builder address to approve
* `nonce` (integer) — Unique nonce
* `nonce` (number, required) — Current timestamp in milliseconds (must be recent)
* `signature` (object, required) — EIP-712 signature of the action
### Optional parameters
* `vaultAddress` (string, optional) — Address when trading on behalf of a vault or subaccount
## Returns
Returns an object with the action status:
* `status` — `"ok"` if request processed
* `response` — Contains action result data
## Example request
```shell cURL theme={"system"}
curl -X POST https://api.hyperliquid.xyz/exchange \
-H "Content-Type: application/json" \
-d '{
"action": {"type": "approveBuilderFee"},
"nonce": 1234567890123,
"signature": {...}
}'
```
```python Python (hyperliquid-python-sdk) theme={"system"}
import eth_account
from hyperliquid.exchange import Exchange
from hyperliquid.utils import constants
# Wallet that signs the EIP-712 action
wallet = eth_account.Account.from_key("YOUR_PRIVATE_KEY")
# Public Hyperliquid API (this method is not available through Chainstack)
exchange = Exchange(wallet, constants.MAINNET_API_URL)
result = exchange.approve_builder_fee(
builder="0x0000000000000000000000000000000000000000",
max_fee_rate="0.01%",
)
print(result)
```
```typescript TypeScript (@nktkas/hyperliquid) theme={"system"}
import * as hl from "@nktkas/hyperliquid";
import { privateKeyToAccount } from "viem/accounts";
// Wallet that signs the EIP-712 action
const wallet = privateKeyToAccount("0x..."); // viem or ethers
// Public Hyperliquid API (this method is not available through Chainstack)
const transport = new hl.HttpTransport();
const client = new hl.ExchangeClient({ transport, wallet });
const result = await client.approveBuilderFee({
maxFeeRate: "0.01%",
builder: "0x0000000000000000000000000000000000000000",
});
console.log(result);
```
## Use case
* **Approve builder fee** — Approves a builder fee for a specific builder address. This allows the builder to charge fees on orders placed through their interface.
Always ensure your system clock is synchronized. Nonce must be within a reasonable time window of the current server time or the request will be rejected.
## OpenAPI
````yaml openapi/hyperliquid_node_api/hypercore_exchange/exchange_approve_builder_fee.json post /exchange
openapi: 3.0.0
info:
title: Hyperliquid Exchange API
version: 1.0.0
description: >-
API for trading operations on Hyperliquid exchange. **IMPORTANT**: All
exchange endpoints require EIP-712 signatures for authentication. The
examples shown will not work without proper signing. See the [Hyperliquid
Python SDK](https://github.com/hyperliquid-dex/hyperliquid-python-sdk) for
implementation examples.
servers:
- url: https://api.hyperliquid.xyz
security: []
paths:
/exchange:
post:
tags:
- hyperliquid exchange
summary: Approve builder fee
operationId: approveBuilderFee
requestBody:
required: true
content:
application/json:
schema:
type: object
properties:
action:
type: object
properties:
type:
type: string
default: approveBuilderFee
enum:
- approveBuilderFee
description: Action type
hyperliquidChain:
type: string
description: Chain identifier
default: Mainnet
enum:
- Mainnet
- Testnet
signatureChainId:
type: string
description: EIP-712 signature chain ID
default: '0xa4b1'
maxFeeRate:
type: string
description: Maximum fee rate as a percentage string (e.g., "0.001%")
builder:
type: string
description: Ethereum address of the builder
nonce:
type: integer
description: Current timestamp in milliseconds
required:
- type
- hyperliquidChain
- signatureChainId
- maxFeeRate
- builder
- nonce
nonce:
type: integer
description: Current timestamp in milliseconds
signature:
type: object
description: EIP-712 signature of the action with r, s, v components
properties:
r:
type: string
description: ECDSA signature r component (hex string)
example: >-
0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef
s:
type: string
description: ECDSA signature s component (hex string)
example: >-
0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321
v:
type: integer
description: ECDSA recovery id (27 or 28)
example: 27
required:
- r
- s
- v
vaultAddress:
type: string
description: >-
Address when trading on behalf of a vault or subaccount
(optional)
nullable: true
required:
- action
- nonce
- signature
example:
action:
type: approveBuilderFee
hyperliquidChain: Mainnet
signatureChainId: '0xa4b1'
maxFeeRate: 0.001%
builder: '0x1234567890abcdef1234567890abcdef12345678'
nonce: 1705234567890
nonce: 1705234567890
signature:
r: >-
0x0000000000000000000000000000000000000000000000000000000000000000
s: >-
0x0000000000000000000000000000000000000000000000000000000000000000
v: 27
vaultAddress: null
responses:
'200':
description: Action result
content:
application/json:
schema:
type: object
properties:
status:
type: string
description: Request status
response:
type: object
description: Action response data
````