Stablecoin Yield via Paxos Amplify

Combine Para’s wallet infrastructure with Amplify to enable stablecoin yield deposits and withdrawals, all from a Para-powered wallet. This walkthrough covers two integration paths: the Amplify SDK for a higher-level API, and direct smart contract calls for environments where the SDK isn’t available.

Why Combine Para and Paxos Amplify

Para Wallets	Paxos Amplify
Instant onboarding, MPC-secure, white-label	Stablecoin yield across multiple strategies
Embedded + external wallet support	Multi-chain support, unified deposit API
Email/social login — no seed phrase or browser extension	Audited smart contracts

Example Use Cases

Fintech App Integration — Embed stablecoin deposit and yield flows directly in your fintech application with Para’s white-label wallet onboarding.
Stablecoin Yield Product — Build a consumer-facing earn product where users deposit stablecoins into Amplify vaults through a Para-powered wallet — no browser extension required.
Treasury Management — Automate treasury yield strategies from Para wallets with programmable deposit and withdrawal rules.
Multi-Language Backend — Call Amplify contracts directly from Python, Go, Swift, or any language with an Ethereum JSON-RPC library — no JavaScript SDK required.

What You Need

Para SDK for creating and managing wallets
EVM-compatible chain such as Ethereum Mainnet
Amplify API Credentials (pxl_your_api_key) from support@paxoslabs.com
Amplify SDK (SDK path only) — @paxoslabs/amplify-sdk

Step-by-Step Integration

SDK Integration
Direct Contracts

Step 1: Install Dependencies

npm install @getpara/viem-v2-integration @getpara/react-sdk @paxoslabs/amplify-sdk viem

Step 2: Initialize Para and Amplify

Complete authentication before signing any transactions.

import { createParaViemClient, createParaAccount } from "@getpara/viem-v2-integration";
import { ParaWeb } from "@getpara/react-sdk";
import { http, createPublicClient } from "viem";
import { mainnet } from "viem/chains";
import { initAmplifySDK } from "@paxoslabs/amplify-sdk";

// Initialize Para
const para = new ParaWeb("YOUR_PARA_API_KEY");

// Initialize Amplify SDK
await initAmplifySDK("pxl_your_api_key", {
  rpcUrls: { [mainnet.id]: "https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY" },
});

Step 3: Create Para Account and Clients

const account = await createParaAccount(para);

const walletClient = createParaViemClient(para, {
  account,
  chain: mainnet,
  transport: http("https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY"),
});

const publicClient = createPublicClient({
  chain: mainnet,
  transport: http("https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY"),
});

Step 4: Discover a Vault and Deposit

The SDK auto-detects the optimal authorization method (gasless permit, standard approval, or existing allowance) and handles each path for you.

import {
  getVaultsByConfig,
  prepareDepositAuthorization,
  prepareDeposit,
  isPermitAuth,
  isApprovalAuth,
  isAlreadyApprovedAuth,
  YieldType,
} from "@paxoslabs/amplify-sdk";

// Find a vault by yield strategy, chain, and asset
const [vault] = await getVaultsByConfig({
  yieldType: YieldType.CORE, // "CORE", "TREASURY", or "FRONTIER"
  chainId: mainnet.id,
  depositAssetAddress: "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48", // USDC
});

const params = {
  vaultName: vault.name,
  depositAsset: vault.vault.baseTokenAddress,
  depositAmount: "1000", // 1000 USDC
  to: account.address,
  chainId: mainnet.id,
};

// Auto-detect optimal authorization method
const auth = await prepareDepositAuthorization(params);

if (isPermitAuth(auth)) {
  // Para signs the EIP-712 permit off-chain (gasless)
  const signature = await walletClient.signTypedData({
    account,
    ...auth.permitData,
  });

  const prepared = await prepareDeposit({
    ...params,
    signature,
    deadline: auth.permitData.message.deadline,
  });

  const hash = await walletClient.writeContract({ ...prepared.txData, account });
  await publicClient.waitForTransactionReceipt({ hash });
} else if (isApprovalAuth(auth)) {
  // Standard ERC-20 approve followed by deposit
  const approvalHash = await walletClient.writeContract({ ...auth.txData, account });
  await publicClient.waitForTransactionReceipt({ hash: approvalHash });

  const prepared = await prepareDeposit(params);
  const depositHash = await walletClient.writeContract({ ...prepared.txData, account });
  await publicClient.waitForTransactionReceipt({ hash: depositHash });
} else if (isAlreadyApprovedAuth(auth)) {
  // Sufficient allowance — deposit directly
  const prepared = await prepareDeposit(params);
  const hash = await walletClient.writeContract({ ...prepared.txData, account });
  await publicClient.waitForTransactionReceipt({ hash });
}

Step 5: Withdraw from a Vault

import {
  prepareWithdrawalAuthorization,
  prepareWithdrawal,
  isWithdrawApprovalAuth,
} from "@paxoslabs/amplify-sdk";

const withdrawParams = {
  vaultName: vault.name,
  wantAsset: vault.vault.baseTokenAddress,
  withdrawAmount: "500", // 500 Shares
  userAddress: account.address,
  chainId: mainnet.id,
};

const withdrawAuth = await prepareWithdrawalAuthorization(withdrawParams);

if (isWithdrawApprovalAuth(withdrawAuth)) {
  const approvalHash = await walletClient.writeContract({ ...withdrawAuth.txData, account });
  await publicClient.waitForTransactionReceipt({ hash: approvalHash });
}

const withdrawTxData = await prepareWithdrawal(withdrawParams);
const withdrawHash = await walletClient.writeContract({ ...withdrawTxData, account });
await publicClient.waitForTransactionReceipt({ hash: withdrawHash });

Step 1: Install Dependencies

npm install @getpara/viem-v2-integration @getpara/react-sdk viem

Step 2: Initialize Para

Complete authentication before signing any transactions.

import { createParaViemClient, createParaAccount } from "@getpara/viem-v2-integration";
import { ParaWeb } from "@getpara/react-sdk";
import { http, createPublicClient } from "viem";
import { mainnet } from "viem/chains";

const para = new ParaWeb("YOUR_PARA_API_KEY");

Step 3: Create Para Account and Clients

const account = await createParaAccount(para);

const walletClient = createParaViemClient(para, {
  account,
  chain: mainnet,
  transport: http("https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY"),
});

const publicClient = createPublicClient({
  chain: mainnet,
  transport: http("https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY"),
});

Step 4: Discover Contract Addresses

Query the Amplify GraphQL API to get vault and module addresses for your target chain and yield type.

const response = await fetch("https://api.paxoslabs.com/graphql", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "x-api-key": "YOUR_AMPLIFY_API_KEY",
  },
  body: JSON.stringify({
    query: `query {
      amplifySdkConfigs(chainId: 1, yieldType: CORE) {
        vault {
          boringVaultAddress
          communityCodeDepositorModuleId
          withdrawQueueModuleId
          accountantModuleId
          supportedAssets { address symbol decimals depositable withdrawable }
        }
      }
    }`,
  }),
});

const { data } = await response.json();
const vault = data.amplifySdkConfigs[0].vault;

const depositorAddress = vault.communityCodeDepositorModuleId;
const withdrawQueueAddress = vault.withdrawQueueModuleId;
const accountantAddress = vault.accountantModuleId;
const boringVaultAddress = vault.boringVaultAddress;
const usdcAddress = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48";

Step 5: Approve and Deposit

const erc20Abi = [
  {
    inputs: [
      { name: "spender", type: "address" },
      { name: "amount", type: "uint256" },
    ],
    name: "approve",
    outputs: [{ name: "", type: "bool" }],
    stateMutability: "nonpayable",
    type: "function",
  },
];

const depositorAbi = [
  {
    inputs: [
      { name: "depositAsset", type: "address" },
      { name: "depositAmount", type: "uint256" },
      { name: "minimumMint", type: "uint256" },
      { name: "to", type: "address" },
      { name: "distributorCode", type: "bytes" },
      {
        components: [
          { name: "uuid", type: "string" },
          { name: "expiration", type: "uint256" },
          { name: "attester", type: "address" },
          { name: "signature", type: "bytes" },
        ],
        name: "_attestation",
        type: "tuple",
      },
    ],
    name: "deposit",
    outputs: [{ name: "shares", type: "uint256" }],
    stateMutability: "nonpayable",
    type: "function",
  },
];

const depositAmount = 1000000000n; // 1,000 USDC (6 decimals)

// Approve the depositor to spend your USDC
const approvalHash = await walletClient.writeContract({
  address: usdcAddress,
  abi: erc20Abi,
  functionName: "approve",
  args: [depositorAddress, depositAmount],
  account,
});
await publicClient.waitForTransactionReceipt({ hash: approvalHash });

// Deposit into the vault
const depositHash = await walletClient.writeContract({
  address: depositorAddress,
  abi: depositorAbi,
  functionName: "deposit",
  args: [
    usdcAddress,
    depositAmount,
    0n, // minimumMint — see production note below
    account.address,
    "0x", // distributorCode
    {
      uuid: "",
      expiration: 0n,
      attester: "0x0000000000000000000000000000000000000000",
      signature: "0x",
    },
  ],
  account,
});
await publicClient.waitForTransactionReceipt({ hash: depositHash });

In production, query Accountant.getRateInQuoteSafe(usdcAddress) to calculate a safe minimumMint with slippage protection instead of passing 0n. See the slippage calculation below.

Production slippage calculation:The intermediate arithmetic uses WAD (1e18) precision, then scales to the vault share token’s on-chain decimals.

const WAD = 10n ** 18n;
const SLIPPAGE_BPS = 50n; // 0.5%

const accountantAbi = [
  {
    inputs: [{ name: "quote", type: "address" }],
    name: "getRateInQuoteSafe",
    outputs: [{ name: "rateInQuote", type: "uint256" }],
    stateMutability: "view",
    type: "function",
  },
] as const;

const rateInQuote = await publicClient.readContract({
  address: accountantAddress,
  abi: accountantAbi,
  functionName: "getRateInQuoteSafe",
  args: [usdcAddress],
});

const vaultTokenDecimals = await publicClient.readContract({
  address: boringVaultAddress,
  abi: [{ inputs: [], name: "decimals", outputs: [{ type: "uint8" }], stateMutability: "view", type: "function" }],
  functionName: "decimals",
});

const idealMint = (depositAmount * WAD) / rateInQuote;
const slippageWad = (SLIPPAGE_BPS * WAD) / 10_000n;
const slippageAmount = (idealMint * slippageWad) / WAD;

const minimumMint = vaultTokenDecimals > 18
  ? (idealMint - slippageAmount) * 10n ** (BigInt(vaultTokenDecimals) - 18n)
  : (idealMint - slippageAmount) / 10n ** (18n - BigInt(vaultTokenDecimals));

Step 6: Submit a Withdrawal Order

Withdrawal orders are fulfilled by the Amplify account operator, typically within 24 hours.

const withdrawQueueAbi = [
  {
    inputs: [
      {
        components: [
          { name: "amountOffer", type: "uint256" },
          { name: "wantAsset", type: "address" },
          { name: "intendedDepositor", type: "address" },
          { name: "receiver", type: "address" },
          { name: "refundReceiver", type: "address" },
          {
            components: [
              { name: "approvalMethod", type: "uint8" },
              { name: "approvalV", type: "uint8" },
              { name: "approvalR", type: "bytes32" },
              { name: "approvalS", type: "bytes32" },
              { name: "submitWithSignature", type: "bool" },
              { name: "deadline", type: "uint256" },
              { name: "eip2612Signature", type: "bytes" },
            ],
            name: "signatureParams",
            type: "tuple",
          },
        ],
        name: "params",
        type: "tuple",
      },
    ],
    name: "submitOrder",
    outputs: [{ name: "orderIndex", type: "uint256" }],
    stateMutability: "nonpayable",
    type: "function",
  },
];

const sharesToWithdraw = 500000000000000000000n; // example share amount

// Approve vault shares to the WithdrawQueue
const shareApprovalHash = await walletClient.writeContract({
  address: boringVaultAddress,
  abi: erc20Abi,
  functionName: "approve",
  args: [withdrawQueueAddress, sharesToWithdraw],
  account,
});
await publicClient.waitForTransactionReceipt({ hash: shareApprovalHash });

// Submit the withdrawal order
const withdrawHash = await walletClient.writeContract({
  address: withdrawQueueAddress,
  abi: withdrawQueueAbi,
  functionName: "submitOrder",
  args: [
    {
      amountOffer: sharesToWithdraw,
      wantAsset: usdcAddress,
      intendedDepositor: account.address,
      receiver: account.address,
      refundReceiver: account.address,
      signatureParams: {
        approvalMethod: 0,
        approvalV: 0,
        approvalR: "0x0000000000000000000000000000000000000000000000000000000000000000",
        approvalS: "0x0000000000000000000000000000000000000000000000000000000000000000",
        submitWithSignature: false,
        deadline: 0n,
        eip2612Signature: "0x",
      },
    },
  ],
  account,
});
await publicClient.waitForTransactionReceipt({ hash: withdrawHash });

Use WithdrawQueue.getOrderStatus(orderIndex) to poll for withdrawal completion.

Paxos Amplify

Stablecoin yield protocol documentation and API reference

Para Viem Integration

Set up Para wallets with Viem for EVM transaction signing

EIP-712 Typed Data Signing

Sign structured data using the EIP-712 standard with Para wallets

Overview

DeFi & Money Movement

Smart Accounts

Chains & Privacy

Para Templates

Agents

Stablecoin Yield via Paxos Amplify

Why Combine Para and Paxos Amplify

Example Use Cases

What You Need

Step-by-Step Integration

Step 1: Install Dependencies

Step 2: Initialize Para and Amplify

Step 3: Create Para Account and Clients

Step 4: Discover a Vault and Deposit

Step 5: Withdraw from a Vault

Step 1: Install Dependencies

Step 2: Initialize Para

Step 3: Create Para Account and Clients

Step 4: Discover Contract Addresses

Step 5: Approve and Deposit

Step 6: Submit a Withdrawal Order

Paxos Amplify

Para Viem Integration

EIP-712 Typed Data Signing

Overview

DeFi & Money Movement

Smart Accounts

Chains & Privacy

Para Templates

Agents

Documentation Index

​Why Combine Para and Paxos Amplify

​Example Use Cases

​What You Need

​Step-by-Step Integration

​Step 1: Install Dependencies

​Step 2: Initialize Para and Amplify

​Step 3: Create Para Account and Clients

​Step 4: Discover a Vault and Deposit

​Step 5: Withdraw from a Vault

​Step 1: Install Dependencies

​Step 2: Initialize Para

​Step 3: Create Para Account and Clients

​Step 4: Discover Contract Addresses

​Step 5: Approve and Deposit

​Step 6: Submit a Withdrawal Order

​Related Resources

Paxos Amplify

Para Viem Integration

EIP-712 Typed Data Signing

Why Combine Para and Paxos Amplify

Example Use Cases

What You Need

Step-by-Step Integration

Step 1: Install Dependencies

Step 2: Initialize Para and Amplify

Step 3: Create Para Account and Clients

Step 4: Discover a Vault and Deposit

Step 5: Withdraw from a Vault

Step 1: Install Dependencies

Step 2: Initialize Para

Step 3: Create Para Account and Clients

Step 4: Discover Contract Addresses

Step 5: Approve and Deposit

Step 6: Submit a Withdrawal Order

Related Resources