curl --request POST \
  --url https://api.hypereth.io/v1/exchange/order \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "action": {
    "type": "order",
    "orders": [
      {
        "a": 0,
        "b": true,
        "p": "43250.0",
        "s": "0.1",
        "r": false,
        "t": {
          "limit": {
            "tif": "Gtc"
          }
        }
      }
    ]
  },
  "nonce": 1681923833000,
  "signature": {
    "r": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
    "s": "0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321",
    "v": 27
  }
}'

{
  "status": "ok",
  "response": {
    "type": "order",
    "data": {
      "statuses": [
        {
          "resting": {
            "oid": 123
          }
        }
      ]
    }
  }
}