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  1. Home
  2. /Glossary
  3. /Calldata
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blockchain

Calldata

The data sent along with an Ethereum transaction that tells a smart contract what function to call and with what parameters.

Definition

The data sent along with an Ethereum transaction that tells a smart contract what function to call and with what parameters. Calldata is stored on-chain permanently but can't be modified. Layer 2 rollups post compressed transaction data as calldata on Ethereum for data availability.

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Related Terms

Transaction

A transfer of value or data recorded on a blockchain.

Smart Contract

Self-executing code stored on a blockchain that runs when conditions are met.

Gas

The fee paid to process transactions on Ethereum and similar blockchains.

ABI

Application Binary Interface.

Account Abstraction

A way to make crypto wallets behave more like normal apps by turning every account into a smart contract.

Account Model

The way Ethereum and many other chains track balances.

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