Finalize EVM contract linkage
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{
"status": "ok",
"response": {
"type": "default"
}
}Hyperliquid node API
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 --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{
"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.
finalizeEvmContract action finalizes the link between a HyperCore token and its HyperEVM contract, using a verification method that matches how the contract was deployed.
Get your own node endpoint todayStart for free and get your app to production levels immediately. No credit card required.You can sign up with your GitHub, X, Google, or Microsoft account.
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 slotkeccak256("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, withtype"default".
Example request
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
Last modified on June 24, 2026
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