Facing issue while verifying contract

[shubhamkr95]

Version of Hardhat

2.22.2

What happened?

While verifying the address on Amoy testnet network using hardhat verify. It was throwing error

An unexpected error occurred during the verification process.
Please report this issue to the Hardhat team.
Error Details: Unexpected token i in JSON at position 0

hardhat-verify found one or more errors during the verification process:

Etherscan:
Etherscan API call failed with status 415, response: invalid content type, only application/json is supported

Minimal reproduction steps

Added the amoy network in hardhat.config.js

etherscan:{
  apiKey: process.env.POLYGONSCAN_KEY,
  customChains: [
    {
      network: "amoy",
      chainId: 80002,
      urls: {
        apiURL: `https://rpc-amoy.polygon.technology`,
        browserURL: "https://amoy.polygonscan.com/"
      }
    },
  ],
},

Search terms

No response

[schaable]

Hi @shubhamkr95,

It looks like there's an issue with your apiURL. It seems you're using an RPC URL, but you should be using the API URL provided by PolygonScan. You can find more details here.

The correct URL to use would be: https://api-amoy.polygonscan.com/api

Hope this helps! Let me know if you have any questions.