# Interact with Contracts

> Documentation index: [llms.txt](https://namera.ai/llms.txt).

Source: https://namera.ai/docs/sdk/guides/transactions/interact-with-contracts

Encode and execute a smart-contract function call.

Pass a contract address and encoded function call to `executions.execute()`.
The contract receives the call from your Namera account.

## Before You Start [#before-you-start]

Use an [authenticated client](https://namera.ai/docs/sdk/authentication) and a session key
installed on **Base Sepolia**. Its permissions must allow the target contract
and function.

```sh
npm install @namera-ai/sdk viem
```

## Call a Function [#call-a-function]

This example calls `setGreeting(string)` on a contract you have deployed.
Replace the IDs and contract address with your own, and use the ABI of the
contract you are calling.

```ts title="index.ts"
import { NameraClient } from "@namera-ai/sdk";
import { encodeFunctionData, parseAbi } from "viem";

const namera = new NameraClient({ apiKey: process.env.NAMERA_API_KEY! });
const abi = parseAbi(["function setGreeting(string greeting)"]);

const execution = await namera.executions.execute({
  namespace: "eip155",
  walletId: "0199dfe1-0000-7000-8000-000000000001",
  sessionKeyId: "0199dfe1-0000-7000-8000-000000000002",
  chainId: "eip155:84532",
  calls: [
    {
      to: "0x3333333333333333333333333333333333333333",
      value: 0n,
      data: encodeFunctionData({
        abi,
        functionName: "setGreeting",
        args: ["Hello from Namera"],
      }),
    },
  ],
  sponsor: true,
});

if (!execution.success) throw new Error(execution.error.message);

console.log(execution.data);
```

<div className="docs-response">

```json
{
  "namespace": "eip155",
  "submissionId": "0199dfe1-0000-7000-8000-000000000003",
  "status": "prepared",
  "userOperationHash": "0x1111111111111111111111111111111111111111111111111111111111111111"
}
```

</div>

The response identifies the submission, not the function's return value.
[Track it](https://namera.ai/docs/sdk/guides/transactions/track-transactions) to confirm execution.

## Send ETH with a Call [#send-eth-with-a-call]

For a **payable** function, set the call's `value` with `parseEther`:

```ts title="index.ts"
import { parseEther } from "viem";

const value = parseEther("0.001");
```

Use this value in place of `0n` only when the target function accepts ETH.
The `setGreeting` example above is not payable. The account needs enough ETH
and the session key must allow the native transfer as well as the function call.

Before submitting a new contract interaction,
[simulate the transaction](https://namera.ai/docs/sdk/guides/transactions/simulate-transactions).