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What is a vault deposit transaction?

A vault deposit transaction sends assets into a DeFi vault (often ERC-4626) and receives vault shares in return. This example uses an ERC-4626 vault deposit. Adjust the contract address, function signature, and amount for your protocol.

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1) Set up the client and signer

Create the SDK client and signer used for approvals. 
import { DenClient, NetworkId } from "@den/sdk";
import { privateKeyToAccount } from "viem/accounts";
import { encodeFunctionData } from "viem";

const signer = privateKeyToAccount("0xYOUR_PRIVATE_KEY");

const client = new DenClient({
  apiKey: "ck_live_...",
  rpcProviders: {
    1: "https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY",
  },
});

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2) Encode the vault deposit

Encode the ERC-4626 deposit call data for the vault. 
const erc4626DepositAbi = [
  {
    name: "deposit",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "assets", type: "uint256" },
      { name: "receiver", type: "address" },
    ],
    outputs: [{ name: "shares", type: "uint256" }],
  },
];

const data = encodeFunctionData({
  abi: erc4626DepositAbi,
  functionName: "deposit",
  args: [1_000_000_000n, "0xReceiver..."],
});

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3) Create the deposit transaction

Create a transaction proposal with the encoded deposit data. 
const queued = await client.createTransaction("acc_123", {
  networkId: NetworkId.ETHEREUM,
  policyId: "pol_123",
  description: "Deposit into vault",
  to: "0xVaultAddress...",
  value: "0",
  data,
});

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4) Sign and execute

Sign as the initiator, then execute once approvals are ready. 
const initiatorSig = await signer.signMessage({
  message: queued.signingPayloads.initiatorPayload,
});

const afterInitiator = await client.signTransaction("acc_123", queued.id, {
  type: "initiator",
  signature: initiatorSig,
});

if (afterInitiator.signatureStatus === "approvalReady") {
  await client.executeTransaction("acc_123", queued.id, { type: "approve" });
}

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Full example

import { DenClient, NetworkId } from "@den/sdk";
import { privateKeyToAccount } from "viem/accounts";
import { encodeFunctionData } from "viem";

// 1) Set up the client and signer.
const signer = privateKeyToAccount("0xYOUR_PRIVATE_KEY");

const client = new DenClient({
  apiKey: "ck_live_...",
  rpcProviders: {
    1: "https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY",
  },
});

// 2) Encode the vault deposit.
const erc4626DepositAbi = [
  {
    name: "deposit",
    type: "function",
    stateMutability: "nonpayable",
    inputs: [
      { name: "assets", type: "uint256" },
      { name: "receiver", type: "address" },
    ],
    outputs: [{ name: "shares", type: "uint256" }],
  },
];

const data = encodeFunctionData({
  abi: erc4626DepositAbi,
  functionName: "deposit",
  args: [1_000_000_000n, "0xReceiver..."],
});

// 3) Create the deposit transaction.
const queued = await client.createTransaction("acc_123", {
  networkId: NetworkId.ETHEREUM,
  policyId: "pol_123",
  description: "Deposit into vault",
  to: "0xVaultAddress...",
  value: "0",
  data,
});

// 4) Sign and execute.
const initiatorSig = await signer.signMessage({
  message: queued.signingPayloads.initiatorPayload,
});

const afterInitiator = await client.signTransaction("acc_123", queued.id, {
  type: "initiator",
  signature: initiatorSig,
});

if (afterInitiator.signatureStatus === "approvalReady") {
  await client.executeTransaction("acc_123", queued.id, { type: "approve" });
}