How to get the spender allowance of an ERC20 token

Step 1: Setup Moralis

Read the article Setting Up Moralis: Getting Started and make sure to finish all the steps. Only after that you can go ahead to complete this guide.

Step 2: Get the spender allowance of an ERC20 token

In order to get the spender allowance, Moralis provides you with an getTokenAllowance endpoint.

Here you'll need four parameters: address , chain, ownerAddress , spenderAddress.

• address: The address of the token contract.
• chain: The chain to query.
• ownerAddress: The address of the token owner.
• spenderAddress: The address of the token spender.

Once you have obtained the parameters, you can copy the following code:

index.js (JavaScript)

const Moralis = require("moralis").default;
const { EvmChain } = require("@moralisweb3/common-evm-utils");

const runApp = async () => {
  await Moralis.start({
    apiKey: "YOUR_API_KEY",
    // ...and any other configuration
  });

  const chain = EvmChain.ETHEREUM;

  const address = "0x514910771AF9Ca656af840dff83E8264EcF986CA";

  const ownerAddress = "0x7c470D1633711E4b77c8397EBd1dF4095A9e9E02";

  const spenderAddress = "0xed33259a056f4fb449ffb7b7e2ecb43a9b5685bf";

  const response = await Moralis.EvmApi.token.getTokenAllowance({
    address,
    chain,
    ownerAddress,
    spenderAddress,
  });

  console.log(response.toJSON());
};

runApp();

index.ts (TypeScript)

import Moralis from "moralis";
import { EvmChain } from "@moralisweb3/common-evm-utils";

const runApp = async () => {
  await Moralis.start({
    apiKey: "YOUR_API_KEY",
    // ...and any other configuration
  });

  const chain = EvmChain.ETHEREUM;

  const address = "0x514910771AF9Ca656af840dff83E8264EcF986CA";

  const ownerAddress = "0x7c470D1633711E4b77c8397EBd1dF4095A9e9E02";

  const spenderAddress = "0xed33259a056f4fb449ffb7b7e2ecb43a9b5685bf";

  const response = await Moralis.EvmApi.token.getTokenAllowance({
    address,
    chain,
    ownerAddress,
    spenderAddress,
  });

  console.log(response.toJSON());
};

runApp();

index.py (Python)

from moralis import evm_api

api_key = "YOUR_API_KEY"
params = {
    "address": "0x514910771AF9Ca656af840dff83E8264EcF986CA",
    "owner_address": "0x7c470D1633711E4b77c8397EBd1dF4095A9e9E02",
    "spender_address": "0xed33259a056f4fb449ffb7b7e2ecb43a9b5685bf",
    "chain": "eth"
}

result = evm_api.token.get_token_allowance(
    api_key=api_key,
    params=params,
)

print(result)

Step 3: Run the script

To run the script, enter the following command:

Shell (JavaScript)

node index.js

Shell (TypeScript)

ts-node index.ts

Shell (Python)

python index.py

In your terminal, you should see the following JSON response:

{
  "allowance": "0"
}

Congratulations 🥳 You just got the spender allowance with just a few lines of code using the Moralis Token API!

API Reference

If you want to know more details on the endpoint and optional parameters, check out:

• getTokenAllowance

Support

If you face any trouble following the tutorial, feel free to reach out to our community engineers in our Discord or Forum to get 24/7 developer support.