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

​
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
​
nonce
integer
required

Current timestamp in milliseconds

​
signature
object
required

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

​
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
Last modified on June 24, 2026