> ## Documentation Index
> Fetch the complete documentation index at: https://docs.turnkey.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Ethereum (EVM)

> This page provides examples of policies governing Ethereum (EVM) signing.

Note: see the [language section](/concepts/policies/language#ethereum) for more details.

#### Allow ABI-specific contract call parameters

See [here](../../../concepts/policies/smart-contract-interfaces) for more information and examples.

#### Allow ERC-20 transfers for a specific token smart contract

```json theme={"system"}
{
  "policyName": "Enable ERC-20 transfers for <CONTRACT_ADDRESS>",
  "effect": "EFFECT_ALLOW",
  "condition": "eth.tx.to == '<CONTRACT_ADDRESS>' && eth.tx.data[0..10] == '0xa9059cbb'"
}
```

#### Allow anyone to sign transactions for testnet (Sepolia)

```json theme={"system"}
{
  "policyName": "Allow signing ethereum sepolia transactions",
  "effect": "EFFECT_ALLOW",
  "condition": "eth.tx.chain_id == 11155111"
}
```

#### Allow ETH transactions with a specific nonce range

```json theme={"system"}
{
  "policyName": "Allow signing Ethereum transactions with an early nonce",
  "effect": "EFFECT_ALLOW",
  "condition": "eth.tx.nonce <= 3"
}
```

#### Allow signing of EIP-712 payloads for Hyperliquid `ApproveAgent` operations

```json theme={"system"}
{
  "policyName": "Allow signing of EIP-712 Payloads for Hyperliquid `ApproveAgent` operations",
  "effect": "EFFECT_ALLOW",
  "condition": "eth.eip_712.domain.name == 'HyperliquidSignTransaction' && eth.eip_712.primary_type == 'HyperliquidTransaction:ApproveAgent' && activity.type == 'ACTIVITY_TYPE_SIGN_RAW_PAYLOAD_V2'"
}
```

#### Inspect nested fields in EIP-712 message payloads

The `eth.eip_712.message` map supports nested field access using bracket notation, allowing policies to inspect typed data contents beyond just the domain and primary type.

**Syntax:**

* Nested struct fields: `eth.eip_712.message['outerField']['innerField']`
* Array element fields: `eth.eip_712.message['arrayField'][0]['innerField']`

**Example: Restrict Hyperliquid orders to a specific asset**

Hyperliquid's `HyperliquidTransaction:Order` message contains an `orders` array of `Order` structs. Each `Order` uses short field names: `a` (asset index), `b` (isBuy), `p` (price), `s` (size), `r` (reduceOnly).

```json theme={"system"}
{
  "primaryType": "HyperliquidTransaction:Order",
  "domain": { "name": "HyperliquidSignTransaction", ... },
  "message": {
    "orders": [
      { "a": 3, "b": true, "p": "1800.0", "s": "0.1", "r": false, ... }
    ],
    "grouping": "normalTpsl"
  }
}
```

To allow only orders for a specific asset (e.g. ETH = asset index `3`):

```json theme={"system"}
{
  "policyName": "Allow Hyperliquid orders for ETH only",
  "effect": "EFFECT_ALLOW",
  "condition": "eth.eip_712.domain.name == 'HyperliquidSignTransaction' && eth.eip_712.primary_type == 'HyperliquidTransaction:Order' && eth.eip_712.message['orders'][0]['a'] == '3' && activity.type == 'ACTIVITY_TYPE_SIGN_RAW_PAYLOAD_V2'"
}
```

<Note>
  Array access is index-based (`[0]`, `[1]`, etc.). The condition `message['orders'][0]['a'] == '3'` only checks the first order — any additional orders in the array are not evaluated. To restrict all orders in a known-size batch, add a condition for each index: `message['orders'][0]['a'] == '3' && message['orders'][1]['a'] == '3'`.
</Note>

### Deny signing of `NO_OP` keccak256 payloads

```json theme={"system"}
{
  "policyName": "Deny NO_OP hash signing",
  "effect": "EFFECT_DENY",
  "condition": "activity.type == 'ACTIVITY_TYPE_SIGN_RAW_PAYLOAD_V2' && activity.params.hash_function == 'HASH_FUNCTION_NO_OP' && activity.params.encoding != 'PAYLOAD_ENCODING_EIP712'"
}
```

#### Allow signing of EIP-712 payloads for EIP-3009 transfers

```json theme={"system"}
{
  "policyName": "Allow signing of EIP-712 payloads for EIP-3009 Transfers for USD Coin",
  "effect": "EFFECT_ALLOW",
  "condition": "eth.eip_712.domain.name == 'USD Coin' && eth.eip_712.primary_type == 'TransferWithAuthorization' && activity.type == 'ACTIVITY_TYPE_SIGN_RAW_PAYLOAD_V2'"
}
```

#### Allow signing of EIP-712 payloads for EIP-2612 permits for USD Coin

```json theme={"system"}
{
  "policyName": "Allow signing of EIP-712 payloads for EIP-2612 Permits for USD Coin",
  "effect": "EFFECT_ALLOW",
  "condition": "eth.eip_712.domain.name == 'USD Coin' && eth.eip_712.primary_type == 'Permit' && activity.type == 'ACTIVITY_TYPE_SIGN_RAW_PAYLOAD_V2'"
}
```

#### Allow signing of EIP-7702 authorizations

```json theme={"system"}
{
  "policyName": "Allow signing of EIP-7702 Authorizations",
  "effect": "EFFECT_ALLOW",
  "condition": "eth.eip_7702_authorization.address == '<ADDRESS>' && eth.eip_7702_authorization.chain_id == '<CHAIN_ID>' && eth.eip_7702_authorization.nonce == '<NONCE>' && activity.type == 'ACTIVITY_TYPE_SIGN_RAW_PAYLOAD_V2'"
}
```