User outcome | Hyperliquid exchange

Split or merge outcome-market shares to convert between quote tokens and Yes/No shares on Hyperliquid. On Hyperliquid exchange.

POST /exchange

User outcome (split / merge / negate outcome shares)

cURL

curl --request POST \
  --url https://api.hyperliquid.xyz/exchange \
  --header 'Content-Type: application/json' \
  --data '
{
  "action": {
    "type": "userOutcome",
    "splitOutcome": {
      "outcome": 0,
      "amount": "1"
    }
  },
  "nonce": 1705234567890,
  "signature": {
    "r": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
    "s": "0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321",
    "v": 27
  }
}
'

import requests

url = "https://api.hyperliquid.xyz/exchange"

payload = {
    "action": {
        "type": "userOutcome",
        "splitOutcome": {
            "outcome": 0,
            "amount": "1"
        }
    },
    "nonce": 1705234567890,
    "signature": {
        "r": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
        "s": "0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321",
        "v": 27
    }
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    action: {type: 'userOutcome', splitOutcome: {outcome: 0, amount: '1'}},
    nonce: 1705234567890,
    signature: {
      r: '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef',
      s: '0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321',
      v: 27
    }
  })
};

fetch('https://api.hyperliquid.xyz/exchange', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.hyperliquid.xyz/exchange",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'action' => [
        'type' => 'userOutcome',
        'splitOutcome' => [
                'outcome' => 0,
                'amount' => '1'
        ]
    ],
    'nonce' => 1705234567890,
    'signature' => [
        'r' => '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef',
        's' => '0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321',
        'v' => 27
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.hyperliquid.xyz/exchange"

	payload := strings.NewReader("{\n  \"action\": {\n    \"type\": \"userOutcome\",\n    \"splitOutcome\": {\n      \"outcome\": 0,\n      \"amount\": \"1\"\n    }\n  },\n  \"nonce\": 1705234567890,\n  \"signature\": {\n    \"r\": \"0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\",\n    \"s\": \"0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321\",\n    \"v\": 27\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.hyperliquid.xyz/exchange")
  .header("Content-Type", "application/json")
  .body("{\n  \"action\": {\n    \"type\": \"userOutcome\",\n    \"splitOutcome\": {\n      \"outcome\": 0,\n      \"amount\": \"1\"\n    }\n  },\n  \"nonce\": 1705234567890,\n  \"signature\": {\n    \"r\": \"0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\",\n    \"s\": \"0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321\",\n    \"v\": 27\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.hyperliquid.xyz/exchange")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"action\": {\n    \"type\": \"userOutcome\",\n    \"splitOutcome\": {\n      \"outcome\": 0,\n      \"amount\": \"1\"\n    }\n  },\n  \"nonce\": 1705234567890,\n  \"signature\": {\n    \"r\": \"0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef\",\n    \"s\": \"0xfedcba0987654321fedcba0987654321fedcba0987654321fedcba0987654321\",\n    \"v\": 27\n  }\n}"

response = http.request(request)
puts response.read_body

200

{
  "status": "ok",
  "response": {
    "type": "default"
  }
}

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 for the full availability breakdown.

This endpoint requires signature authentication. See our comprehensive Authentication via Signatures guide for implementation details.

The userOutcome action manually splits or merges outcome-market shares to convert between quote tokens and Yes/No shares. Outcome markets are binary (Yes/No) prediction markets on Hyperliquid. A single userOutcome action carries exactly one of four operations: splitOutcome, mergeOutcome, mergeQuestion, or negateOutcome.

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Parameters

Required parameters

• action (object, required) — The user outcome action. Set type to "userOutcome" and include exactly one of the following operations:
  • splitOutcome — Split X quote tokens into X Yes and X No shares of an outcome. Fields: outcome (number), amount (string, e.g. "123.0").
  • mergeOutcome — Merge X Yes and X No shares of an outcome into X quote tokens. Fields: outcome (number), amount (string or null, where null means the maximum available).
  • mergeQuestion — Merge X Yes shares from each outcome associated to the same question into X quote tokens. Fields: question (number), amount (string or null, where null means the maximum available).
  • negateOutcome — Convert X No shares from an outcome associated with a question into X Yes shares of every other outcome associated with the question. Fields: question (number), outcome (number), amount (string).
• nonce (number, required) — Current timestamp in milliseconds (must be recent).
• signature (object, required) — EIP-712 signature of the action.

Optional parameters

• expiresAfter (number, optional) — Timestamp in milliseconds after which the request is rejected.

Returns

Returns an object with the action status:

• status — "ok" if the request was processed.
• response — Contains operation details:
  • type — "default".

Example request

cURL

# Split outcome: split 1 quote token into 1 Yes and 1 No share of outcome 0
curl -X POST https://api.hyperliquid.xyz/exchange \
  -H "Content-Type: application/json" \
  -d '{
    "action": {
      "type": "userOutcome",
      "splitOutcome": {"outcome": 0, "amount": "1"}
    },
    "nonce": 1234567890123,
    "signature": {...}
  }'

# Note: the official hyperliquid-python-sdk does not expose a userOutcome
# helper yet, so build and post the signed action directly.
from hyperliquid.exchange import Exchange
from hyperliquid.utils import constants
from hyperliquid.utils.signing import sign_l1_action, get_timestamp_ms
import eth_account

# Public Hyperliquid mainnet endpoint
wallet = eth_account.Account.from_key("0x...")  # your private key
exchange = Exchange(wallet, constants.MAINNET_API_URL)

timestamp = get_timestamp_ms()
action = {
    "type": "userOutcome",
    "splitOutcome": {"outcome": 0, "amount": "1"},
}
signature = sign_l1_action(
    wallet,
    action,
    None,  # vault_address
    timestamp,
    None,  # expires_after
    exchange.base_url == constants.MAINNET_API_URL,
)
result = exchange._post_action(action, signature, timestamp)
print(result)

import { ExchangeClient, HttpTransport } from "@nktkas/hyperliquid";
import { privateKeyToAccount } from "viem/accounts";

// Public Hyperliquid mainnet endpoint (default transport)
const wallet = privateKeyToAccount("0x..."); // viem or ethers account
const transport = new HttpTransport();
const exchange = new ExchangeClient({ transport, wallet });

// Split 1 quote token into 1 Yes and 1 No share of outcome 0
const result = await exchange.userOutcome({
  splitOutcome: { outcome: 0, amount: "1" },
});

console.log(result);

Response example

{
  "status": "ok",
  "response": {
    "type": "default"
  }
}

Use cases

• Provide outcome liquidity — Split quote tokens into Yes and No shares to make markets on both sides
• Redeem shares — Merge matched Yes and No shares back into quote tokens
• Manage positions across a question — Merge or negate shares across the outcomes of a single question

Body

application/json

action · object · required

User outcome action. Provide exactly one of splitOutcome, mergeOutcome, mergeQuestion, or negateOutcome alongside the type.

Show child attributes

nonce · integer · required

Current timestamp in milliseconds

signature · object · required

EIP-712 signature of the action with r, s, v components

Show child attributes

expiresAfter · integer

Timestamp in milliseconds after which the request is rejected (optional)

Response

200 - application/json

User outcome result

status · string

Request status

response · object

Show child attributes