Seaport (seaport)

OpenSea’s decentralized NFT marketplace protocol, with order types including English and Dutch auctions, collection offers, and trait-based offers.

Fact	Value
Category	NFT marketplaces
Family	none
Namespace	`Seaport` on ethereum, optimism, polygon, arc, base, arbitrum
Chains	ethereum, optimism, polygon, arc, base, arbitrum

What it offers

Same address on all 6 chains
Zone-based access control for order restrictions
Conduits are approved transfer proxies - conduitKey=bytes32(0) for default
basicOrderType encodes: ERC-721/1155 + ETH/ERC-20 payment + buy/sell direction
Orders are signed off-chain, fulfilled on-chain - use seaport-js SDK for order creation

On Ethereum, Seaport is a namespace: its contracts need no import.

function main() {
  // Ethereum's seaportV16, `0x0000000000000068F116a894984e2DB1123eB395`.
  require(Seaport.SeaportV16 != 0);
}

Chain	Contract	Address	In a program
Ethereum	seaportV16	`0x0000000000000068F116a894984e2DB1123eB395`	`Seaport.SeaportV16`
Optimism	seaportV16	`0x0000000000000068F116a894984e2DB1123eB395`	`Seaport.SeaportV16`
Polygon	seaportV16	`0x0000000000000068F116a894984e2DB1123eB395`	`Seaport.SeaportV16`
Arc	seaportV16	`0x0000000000000068F116a894984e2DB1123eB395`	`Seaport.SeaportV16`
Base	seaportV16	`0x0000000000000068F116a894984e2DB1123eB395`	`Seaport.SeaportV16`
Arbitrum One	seaportV16	`0x0000000000000068F116a894984e2DB1123eB395`	`Seaport.SeaportV16`

import SeaportABI from "./protocols/seaport/SeaportABI.json"; Speaks for: seaportV16.

fulfillBasicOrder((address considerationToken, uint256 considerationIdentifier, uint256 considerationAmount, address offerer, address zone, address offerToken, uint256 offerIdentifier, uint256 offerAmount, uint8 basicOrderType, uint256 startTime, uint256 endTime, bytes32 zoneHash, uint256 salt, bytes32 offererConduitKey, bytes32 fulfillerConduitKey, uint256 totalOriginalAdditionalRecipients, (uint256 amount, address recipient)[] additionalRecipients, bytes signature) parameters) payable returns (bool fulfilled)
cancel((address offerer, address zone, (uint8 itemType, address token, uint256 identifierOrCriteria, uint256 startAmount, uint256 endAmount)[] offer, (uint8 itemType, address token, uint256 identifierOrCriteria, uint256 startAmount, uint256 endAmount, address recipient)[] consideration, uint8 orderType, uint256 startTime, uint256 endTime, bytes32 zoneHash, uint256 salt, bytes32 conduitKey, uint256 counter)[] orders) returns (bool cancelled)