OpenSea Developer Platform
One API for tokens and NFTs across 30 chains, with swaps on 28 of them, plus open-source SDKs, a CLI, and tools built for AI agents.
What are you building?
Tokens and swaps
Prices, OHLCV candles, holders, liquidity pools, and trending and top tokens, plus swap quotes and execution on 28 chains.
NFTs and trading
Collections, NFTs, listings, offers, and drops. Buy, sell, and bid programmatically with Seaport orders.
Wallets and portfolios
Token balances, NFT holdings, token activity, and profiles for any wallet, with ENS and username resolution.
AI agents
An MCP server, an Agent Skill, llms.txt, and an instant API key that agents can request on their own.
One platform for everything onchain
Swap tokens
Get a quote and execute a swap in two calls, on 28 chains. Pair it with token prices, candles, and liquidity data.
Swap tokens guide →
Buy, sell, and make offers on NFTs
Create listings and offers on single NFTs, whole collections, or specific traits, and fill orders through Seaport.
Buy and sell NFTs guide →
Data across 30 chains
Collections, NFTs, tokens, wallets, and activity from Ethereum and Solana to Base, Polygon, and Arbitrum, behind one API key.
API reference →
Stream real-time events
Subscribe over WebSocket to NFT listings, sales, transfers, and offers, globally or for a single collection.
Stream events guide →From Ethereum and Solana to Base, Polygon, and Arbitrum.
REST coverage across tokens, NFTs, orders, drops, and accounts.
Tokens, NFTs, and swaps behind one key and one set of conventions.
NFT listings, sales, transfers, and offers streamed as they happen.