FAQ

I am on growth tier and my Alchemy dApp is currently being rate limited. What are rate limits and what is my limit?

Hi, I just want to get the latest block number . I followed the docs, but getting the error ``` const provider = new ethers.providers.AlchemyProvider( ^ TypeError: Cannot read properties of undefined (reading 'AlchemyProvider') at Object.<anonymous> (D:\BlockChain\Ether JS\readBlockchain.js:5:39) at Module._compile (node:internal/modules/cjs/loader:1105:14) at Object.Module._extensions..js (node:internal/modules/cjs/loader:1159:10) at Module.load (node:internal/modules/cjs/loader:981:32) at Function.Module._load (node:internal/modules/cjs/loader:822:12) at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12) at node:internal/main/run_main_module:17:47 ``` Here is my code : ```javascript const { ethers } = require("ethers"); const network = "mainnet"; const demo = api_key; const provider = new ethers.providers.AlchemyProvider( network, demo ); const querryBlockchain = async () => { const blockNumber = await provider.getBlockNumber(); console.log(blockNumber); }; querryBlockchain(); ```

seems like something has broken in the SDK based on this code: https://docs.alchemy.com/docs/how-to-mint-an-nft-from-code#step-1-create-an-alchemy-provider-using-ethers `const provider = new ethers.providers.AlchemyProvider('mumbai', apiKey);` gives ``` TypeError: Cannot read properties of null (reading 'name') node_modules/@ethersproject/providers/src.ts/alchemy-provider.ts:57 switch (network.name) { ``` I also tried passing an object ``` const netObj = { // name: 'MATIC_MUMBAI', name: 'polygon-mumbai', // chainId: 80001 // FIXME } ``` using "alchemy-sdk": "^2.0.2", OK so the working magic codes are: ``` const netObj = { // name: 'MATIC_MUMBAI', // name: 'polygon-mumbai', name: 'maticmum', chainId: 80001 // hardwired bullshit } const provider = new ethers.providers.AlchemyProvider(netObj, apiKey); ``` is there a way to get the hardwired chainId somehow?