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The home for Hyperlane core contracts, sdk packages, and other infrastructure
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hyperlane-monorepo/solidity/contracts/middleware/README.md

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# Middleware Contracts
## Interchain Accounts
An interchain account is a smart contract that is deployed on a remote chain controlled exclusively by the origin chain's deployer account.
Interchain accounts provide developers with a [transparent multicall API](libs/OwnableMulticall.sol) to remote smart contracts.
This avoids the need to deploy application specific smart contracts on remote chains while simultaneously enabling cross-chain composability.
See [IBC Interchain Accounts](https://github.com/cosmos/ibc/blob/main/spec/app/ics-027-interchain-accounts/README.md) for the Cosmos ecosystem equivalent.
## Interchain Query System
The interchain query system generalizes view calls to contracts on remote chains. It is a [transparent multicall API](libs/OwnableMulticall.sol) that can be used to query remote smart contracts. This avoids the need to deploy application specific smart contracts on remote chains while simultaneously enabling cross-chain composability.
See [IBC Interchain Query System](https://github.com/cosmos/ibc/tree/main/spec/app/ics-031-crosschain-queries) for the Cosmos ecosystem equivalent.