ethers-multicall-provider

⚡🚀 Call any set of functions from any set of smart contracts in a single RPC query, seamlessly using ethers' providers API!

Querying an RPC endpoint can be very costly (100+ queries) when loading data from multiple smart contracts. With multicall, batch these queries into a single, on-chain query, without additional over-head!

• Integrates both Multicall2 & Multicall3, enabling faster queries up to block #12_336_033 on mainnet
• Natively supports 25+ EVM-compatible chains on which Multicall3 & Multicall2 are deployed
• Enables 10x faster off-chain data queries, making UIs faster to render and reload
• Built-in support for blockTag-specific contract calls, batching all calls made at the same block tag (if applicable)
• Only fails specific failing smart contract calls when batching, which makes debugging as easy as with native ethers

ethers-multicall-provider is a drop-in solution batching ALL smart contract calls!

-  const provider = getDefaultProvider("...");
+  const provider = MulticallWrapper.wrap(getDefaultProvider("..."));

Installation

Using ethers-v6

[!WARNING]
Ethers made changes to their Provider & Signer classes throughout v6, that are breaking types. For versions v6.7 to v6.10, use ethers-multicall-provider@6.2.0. For later versions, use ethers-multicall-provider@6.3.0.

npm install ethers-multicall-provider

yarn add ethers-multicall-provider

Using ethers-v5

[!WARNING]
This version is deprecated and probably is not as efficient as with v6.

npm install ethers-multicall-provider@3.1.2

yarn add ethers-multicall-provider@3.1.2

Usage

Wrap any ethers provider using MulticallWrapper.wrap and use the wrapped provider anywhere you want to batch calls!

import { ethers } from "ethers";
import { MulticallWrapper } from "ethers-multicall-provider";

const provider = MulticallWrapper.wrap(getDefaultProvider("..."));

MulticallWrapper.isMulticallProvider(provider); // Returns true, only useful for type safety.

let uni = new ethers.Contract("0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984", UniAbi, provider);

// Calls performed simultaneously are automatically batched when using the multicall provider.
Promise.all([
  uni.name(),
  uni.symbol(),
  uni.decimals(),
  uni.inexistantFunction().catch(() => "default value"),
]).then(console.log);

// When batching calls is no longer expected, just disable it.
provider.isMulticallEnabled = false;

// Calls performed simultaneously will still perform 2 separate on-chain calls.
Promise.all([uni.name(), uni.symbol()]).then(console.log);

Limits

msg.sender override

Because calls are batched through the Multicall contract, all calls will inherently have the Multicall contract as msg.sender. This has no impact on most queries, because most of the time msg.sender is not used in view functions ; but it may introduce unexpected behaviors in specific smart contracts.

To circumvent this, just use the default ethers provider in places where you don't want msg.sender to be overriden.

Network cache

Starting from ethers-v6, network is no longer cached in the provider, so that each RPC call first requests the network and updates the provider consequently. Using ethers-multicall-provider, the first network the provider is connected to is cached and can only be changed by calling fetchNetwork().