What is @opensea/sdk?

@opensea/sdk is the TypeScript SDK for trading NFTs on OpenSea via the Seaport protocol. Create listings, make offers, fulfill orders, and query NFT data programmatically.

Supports both ethers.js and viem as wallet/provider libraries.

Quick Start

npm install @opensea/sdk

With ethers.js

import { ethers } from "ethers";
import { OpenSeaSDK, Chain } from "@opensea/sdk";

const provider = new ethers.JsonRpcProvider("https://your-rpc-url");

const sdk = new OpenSeaSDK(provider, {
  chain: Chain.Mainnet,
  apiKey: "YOUR_API_KEY",
});

With viem

import { createPublicClient, createWalletClient, http } from "viem";
import { mainnet } from "viem/chains";
import { OpenSeaSDK, Chain } from "@opensea/sdk/viem";

const publicClient = createPublicClient({ chain: mainnet, transport: http("https://your-rpc-url") });
const walletClient = createWalletClient({ chain: mainnet, transport: http("https://your-rpc-url"), account: "0x..." });

const sdk = new OpenSeaSDK(
  { publicClient, walletClient },
  { chain: Chain.Mainnet, apiKey: "YOUR_API_KEY" },
);

Usage (same for both)

// Get a collection
const collection = await sdk.api.getCollection("boredapeyachtclub");

// Make an offer
const offer = await sdk.createOffer({
  asset: { tokenAddress: "0x...", tokenId: "1" },
  accountAddress: "0x...",
  amount: 0.5,
});

// Create a listing
const listing = await sdk.createListing({
  asset: { tokenAddress: "0x...", tokenId: "1" },
  accountAddress: "0x...",
  amount: 3,
});

// Fulfill an order (buy or accept offer)
await sdk.fulfillOrder({ order, accountAddress: "0x..." });

Requirements

Node.js >= 20.0.0
OpenSea API key (get one here)
ethers.js (v6+) or viem (v2+) as your wallet/provider library

Security Warning: Do not use the SDK in client-side code — your API key would be exposed. Use it on a backend server and return transaction data to your frontend.

Documentation

Full documentation including a getting started guide, API reference, advanced use cases (bulk orders, cancellation, event listeners), and FAQ is maintained in the GitHub repository:

github.com/ProjectOpenSea/opensea-js

Links