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prepareContractCall

Prepares a contract call by resolving the ABI function, parameters and encoded data. Optionally specify other properties such as value or gas price.

Example

Usage with a human-readable method signature:

import { prepareContractCall } from "thirdweb";
 
const transaction = prepareContractCall({
  contract,
  method: "function transfer(address to, uint256 value)",
  params: [to, value],
});

Usage with explicit gas price and/or value:

import { prepareContractCall } from "thirdweb";
import { toWei } from "thirdweb/utils";
 
const transaction = prepareContractCall({
  contract,
  method: "function transfer(address to, uint256 value)",
  params: [to, value],
  maxFeePerGas: 30n,
  maxPriorityFeePerGas: 1n,
  value: toWei("0.01"),
});

Usage with a JSON ABI function object:

import { prepareContractCall } from "thirdweb";
 
const transaction = prepareContractCall({
  contract,
  method: {
    name: "transfer",
    type: "function",
    inputs: [
      { name: "to", type: "address" },
      { name: "value", type: "uint256" },
    ],
    outputs: [],
    stateMutability: "payable",
  },
  params: [to, value],
});

Usage with a the ABI defined on the contract:

import { getContract, prepareContractCall } from "thirdweb";
const contract = getContract({
 ..., // chain, address, client
 abi: [...] // ABI with a "transfer" method
});
const transaction = prepareContractCall({
 contract,
 method: "transfer", // <- this gets inferred from the contract
 params: [to, value],
});

Passing extra call data to the transaction

import { getContract, prepareContractCall } from "thirdweb";
const contract = getContract({
  ..., // chain, address, client
});
 
const transaction = prepareContractCall({
  contract,
  method: "function transfer(address to, uint256 value)",
  params: [...],
  // The extra call data MUST be encoded to hex before passing
  extraCallData: "0x......."
});

Parameters

Returns

A promise that resolves to the prepared transaction.