> For the complete documentation index, see [llms.txt](https://docs.vulpefi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vulpefi.com/aggregation-protocol/limit-order-protocol/smart-contracts/helpers.md).

# helpers

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