Approve the builder fee

POST /api/hypercore/agent/approve-builder

Returns the approveBuilderFee EIP-712 payload (maxFeeRate 0.1%) for the user to sign. Required before orders can carry the builder code.

Authentication

Send your API key in the api-key header.

Responses

Status	Description
200	A CoreActionPlan to sign with signTypedData, plus context.

200 response

{
  "success": true,
  "data": {
    "agentAddress": "0x\u2026",
    "plan": {
      "action": {
        "type": "approveAgent"
      },
      "nonce": 1753900000000,
      "typedData": {},
      "scheme": "userSigned"
    }
  },
  "timestamp": "2026-07-31T00:00:00.000Z"
}