Finalize EVM contract | Hyperliquid exchange

Finalize the link between a HyperCore token and its HyperEVM contract. On Hyperliquid exchange.

POST /exchange

Finalize EVM contract linkage

cURL

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

import requests

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

payload = {
    "action": {
        "type": "finalizeEvmContract",
        "token": 0,
        "input": "firstStorageSlot"
    },
    "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: 'finalizeEvmContract', token: 0, input: 'firstStorageSlot'},
    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' => 'finalizeEvmContract',
        'token' => 0,
        'input' => 'firstStorageSlot'
    ],
    '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\": \"finalizeEvmContract\",\n    \"token\": 0,\n    \"input\": \"firstStorageSlot\"\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\": \"finalizeEvmContract\",\n    \"token\": 0,\n    \"input\": \"firstStorageSlot\"\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\": \"finalizeEvmContract\",\n    \"token\": 0,\n    \"input\": \"firstStorageSlot\"\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 finalizeEvmContract action finalizes the link between a HyperCore token and its HyperEVM contract, using a verification method that matches how the contract was deployed.

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Parameters

Required parameters

• action (object, required) — The finalize-EVM-contract action:
  • type (string) — Must be "finalizeEvmContract".
  • token (number) — The token identifier to link.
  • input — The verification method, one of:
    • { "create": { "nonce": <number> } } — for a contract deployed from an EOA; uses the EVM deployment nonce.
    • "firstStorageSlot" — the finalizer address is stored at the contract’s first storage slot.
    • "customStorageSlot" — the finalizer address is stored at slot keccak256("HyperCore deployer").
• nonce (number, required) — Current timestamp in milliseconds.
• 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, with type "default".

Example request

cURL

curl -X POST https://api.hyperliquid.xyz/exchange \
  -H "Content-Type: application/json" \
  -d '{
    "action": {"type": "finalizeEvmContract", "token": 0, "input": "firstStorageSlot"},
    "nonce": 1234567890123,
    "signature": {...}
  }'

# Note: the official hyperliquid-python-sdk does not expose a finalizeEvmContract
# 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": "finalizeEvmContract",
    "token": 0,
    "input": "firstStorageSlot",  # or "customStorageSlot", or {"create": {"nonce": 0}}
}
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 });

const result = await exchange.finalizeEvmContract({
  token: 0,
  input: "firstStorageSlot", // or "customStorageSlot", or { create: { nonce: 0 } }
});

console.log(result);

Response example

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

Use cases

• Link a token to its EVM contract — Complete HyperCore/HyperEVM token linkage
• Token deployment tooling — Finalize contracts as part of a deploy pipeline
• Verify deployment ownership — Prove control via deploy nonce or storage slot

Body

application/json

action · object · required

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

Finalize EVM contract result

status · string

Request status

response · object

Show child attributes