mumbai doesn't have certain contracts so I created a polygon fork

.env.example

@@ -1,3 +1,5 @@
-ETHERSCAN_API_KEY=ABC123ABC123ABC123ABC123ABC123ABC1
-ROPSTEN_URL=https://eth-ropsten.alchemyapi.io/v2/<YOUR ALCHEMY KEY>
-PRIVATE_KEY=0xabc123abc123abc123abc123abc123abc123abc123abc123abc123abc123abc1
+MUMBAI_URL=https://polygon-mumbai.g.alchemy.com/v2/abc123abc123abc123abc123abc123abc123abc
+MUMBAI_PRIVATE_KEY=abc123abc123abc123abc123abc123abc123abc
+
+POLYGON_URL=https://polygon-mainnet.g.alchemy.com/v2/abc123abc123abc123abc123abc123abc123abc
+POLYGON_PRIVATE_KEY=abc123abc123abc123abc123abc123abc123abc

contracts/OffsetHelperStorage.sol

@@ -11,30 +11,30 @@ import "./CO2KEN_contracts/IToucanContractRegistry.sol";
 contract OffsetHelperStorage is OwnableUpgradeable {
     mapping(string => address) public eligibleTokenAddresses;
     address public contractRegistryAddress =
-        0x6739D490670B2710dc7E79bB12E455DE33EE1cb6;
+        0x263fA1c180889b3a3f46330F32a4a23287E99FC9;
     address public sushiRouterAddress =
-        0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506; // this is polygon, not mumbai
+        0x1b02dA8Cb0d097eB8D57A175b88c7D8b47997506;
 
     constructor() {
         eligibleTokenAddresses[
             "BCT"
-        ] = 0xf2438A14f668b1bbA53408346288f3d7C71c10a1;
+        ] = 0x2F800Db0fdb5223b3C3f354886d907A671414A7F;
 
         eligibleTokenAddresses[
             "NCT"
-        ] = 0x7beCBA11618Ca63Ead5605DE235f6dD3b25c530E;
+        ] = 0xD838290e877E0188a4A44700463419ED96c16107;
 
         eligibleTokenAddresses[
             "USDC"
-        ] = 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174; // this is polygon, not mumbai
+        ] = 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174;
 
         eligibleTokenAddresses[
             "WETH"
-        ] = 0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619; // this is polygon, not mumbai
+        ] = 0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619;
 
         eligibleTokenAddresses[
             "WMATIC"
-        ] = 0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270; // this is polygon, not mumbai
+        ] = 0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270;
     }
 
     // @description you can use this to change or add eligible tokens and their addresses if needed

hardhat.config.ts

@@ -23,7 +23,7 @@ task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
 // Go to https://hardhat.org/config/ to learn more
 
 const config: HardhatUserConfig = {
-  defaultNetwork: "hardhat",
+  defaultNetwork: "polygonFork",
   solidity: {
     version: "0.8.4",
     settings: {
@@ -34,14 +34,27 @@ const config: HardhatUserConfig = {
     },
   },
   networks: {
+    polygon: {
+      url: process.env.POLYGON_URL || "",
+      accounts:
+        process.env.POLYGON_PRIVATE_KEY !== undefined
+          ? [process.env.POLYGON_PRIVATE_KEY]
+          : [],
+    },
     mumbai: {
       url: process.env.MUMBAI_URL || "",
       accounts:
         process.env.MUMBAI_PRIVATE_KEY !== undefined
           ? [process.env.MUMBAI_PRIVATE_KEY]
           : [],
     },
-    hardhat: {
+    polygonFork: {
+      forking: {
+        url: process.env.POLYGON_URL || "",
+        blockNumber: 25276448,
+      },
+    },
+    mumbaiFork: {
       forking: {
         url: process.env.MUMBAI_URL || "",
         blockNumber: 25276448,

test/index.ts

@@ -14,9 +14,8 @@ import {
 
 const addresses: any = {
   myAddress: "0x721F6f7A29b99CbdE1F18C4AA7D7AEb31eb2923B",
-  tco2Address: "0xa5831eb637dff307395b5183c86B04c69C518681",
-  bctAddress: "0xf2438A14f668b1bbA53408346288f3d7C71c10a1",
-  nctAddress: "0x7beCBA11618Ca63Ead5605DE235f6dD3b25c530E",
+  bctAddress: "0x2F800Db0fdb5223b3C3f354886d907A671414A7F",
+  nctAddress: "0xD838290e877E0188a4A44700463419ED96c16107",
   usdcAddress: "0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174",
   wethAddress: "0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619",
   wmaticAddress: "0x0d500B1d8E8eF31E21C99d1Db9A6444d3ADf1270",