# helpers

- [AmountCalculator](/aggregation-protocol/limit-order-protocol/smart-contracts/helpers/amountcalculator.md)
- [ChainlinkCalculator](/aggregation-protocol/limit-order-protocol/smart-contracts/helpers/chainlinkcalculator.md)
- [ERC1155Proxy](/aggregation-protocol/limit-order-protocol/smart-contracts/helpers/erc1155proxy.md)
- [ERC721Proxy](/aggregation-protocol/limit-order-protocol/smart-contracts/helpers/erc721proxy.md)
- [ERC721ProxySafe](/aggregation-protocol/limit-order-protocol/smart-contracts/helpers/erc721proxysafe.md)
- [ImmutableOwner](/aggregation-protocol/limit-order-protocol/smart-contracts/helpers/immutableowner.md)
- [NonceManager](/aggregation-protocol/limit-order-protocol/smart-contracts/helpers/noncemanager.md)
- [PredicateHelper](/aggregation-protocol/limit-order-protocol/smart-contracts/helpers/predicatehelper.md)
- [SeriesNonceManager](/aggregation-protocol/limit-order-protocol/smart-contracts/helpers/seriesnoncemanager.md)
- [WethUnwrapper](/aggregation-protocol/limit-order-protocol/smart-contracts/helpers/wethunwrapper.md)