| name | opensea |
| description | Query OpenSea marketplace data — listings, offers, sales / events, floor prices, collection stats, drops, traits — and execute Seaport trades via the official `@opensea/cli` and OpenSea REST API across Ethereum, Base, Arbitrum, Optimism, Polygon, and more. Includes search across collections / NFTs / tokens / accounts. NOT for general NFT metadata reads (name, image, traits, ownership), token metadata, current wallet balances, transaction history, or live RPC reads — for those use `alchemy-cli` (live), `alchemy-mcp`, `alchemy-api` (app code), or `agentic-gateway` (no API key). For pure cross-chain token swaps (no marketplace context), prefer the `lifi` ecosystem skill. Requires `OPENSEA_API_KEY` (instant via API). |
| license | MIT |
| compatibility | API key required via `$OPENSEA_API_KEY` (instant — `curl -X POST https://api.opensea.io/api/v2/auth/keys` returns a key with no signup, or sign up at https://opensea.io/settings/developer for higher limits). Optional `$PRIVY_APP_ID` / `$PRIVY_APP_SECRET` / `$PRIVY_WALLET_ID` for write / fulfillment flows. Needs Node.js (≥ 18), `curl`, `jq` (recommended). |
| metadata | {"author":"opensea","version":"0.1","provider":"opensea","partner":"true"} |
OpenSea (NFT Marketplace Data + Seaport Trades)
OpenSea is the dominant NFT marketplace. This skill queries marketplace data — listings, offers, sales / events, floor prices, drops, traits — and executes Seaport trades via the official @opensea/cli. For NFT metadata (name, image, traits, ownership) outside the marketplace context, use Alchemy's NFT API instead. For pure cross-chain token swaps (no marketplace context), use the lifi ecosystem skill.
| |
|---|
| Primary tool | npx @opensea/cli@latest <command> (or npm install -g @opensea/cli) |
| REST API base | https://api.opensea.io/api/v2 |
| Auth | OPENSEA_API_KEY header — instant via POST /api/v2/auth/keys, or signup at the developer portal |
| Optional Privy | PRIVY_APP_ID / PRIVY_APP_SECRET / PRIVY_WALLET_ID for write / fulfillment flows |
| Chains | Ethereum, Base, Arbitrum, Optimism, Polygon, and more |
When to use this skill
Use opensea when any of the following are true:
- The user wants marketplace data — listings, offers, floor prices, sales history, collection stats
- The user wants to buy / sell an NFT via Seaport (fulfill listing or accept offer)
- The user wants to search across OpenSea (collections / NFTs / tokens / accounts)
- The user wants to monitor events — sales, transfers, mints, listings, offers — for a collection or NFT
- The user wants to explore drops or build a mint transaction for a SeaDrop contract
- The user wants token discovery in the OpenSea-curated context (top, trending, by group)
When NOT to use this skill (handoff)
| Need | Use instead |
|---|
| NFT metadata (name, image, traits, ownership lookup) outside a marketplace context | alchemy-api (NFT API) — broader coverage, fewer rate limits |
| Pure cross-chain token swap (no NFT marketplace need) | lifi (ecosystem skill) — broader bridge / DEX aggregation |
| Token spot prices for valuation | alchemy-api (Prices API) |
| Token metadata, search, list by chain (general) | alchemy-api (Token API) |
| Current wallet balances (token + native) | alchemy-api (Portfolio / Token API) |
| Transaction history (transfers in / out) | alchemy-api (Transfers API) |
Live blockchain reads (block #, gas, eth_call) | alchemy-cli (live) or alchemy-api (JSON-RPC) |
| Pre-execution simulation | alchemy-api (Simulation API) |
| Account abstraction (bundlers, gas managers) | alchemy-api |
| Smart wallet / embedded wallet flows | alchemy-api (Wallets / Account Kit) |
Scope contract
This skill covers (scope_in):
- Marketplace data:
opensea listings best, opensea listings best-for-nft, opensea offers best-for-nft, opensea offers all, opensea collections stats, opensea collections trending, opensea collections top, opensea collections traits
- Seaport trades: fulfillment data for buying (
opensea-fulfill-listing.sh) and selling (opensea-fulfill-offer.sh); creating listings / offers via opensea-post.sh with the Seaport order structure
- Events / monitoring:
opensea events list, events by-collection, events by-nft, events by-account — sale / transfer / mint / listing / offer / trait_offer / collection_offer
- Drops + minting:
opensea drops list, opensea drops get, opensea drops mint
- Search:
opensea search across collections / NFTs / tokens / accounts
- Account utilities:
opensea accounts resolve (ENS / username / address)
This skill does NOT cover (scope_out):
- General NFT metadata reads (name, image, traits, ownership, contract metadata) outside the marketplace context → handoff:
alchemy-api (NFT API). OpenSea's NFT data is marketplace-flavored and rate-limited; Alchemy's NFT API is broader and cheaper for pure metadata.
- Pure cross-chain token swaps (no NFT marketplace use case) → handoff:
lifi (ecosystem skill). OpenSea's swap aggregator works, but lifi covers more bridges and chains.
- Token spot prices for valuation / display → handoff:
alchemy-api (Prices API)
- General token metadata, search, list → handoff:
alchemy-api (Token API)
- Wallet balances (token + native) → handoff:
alchemy-api (Portfolio / Token API)
- Transaction transfer history → handoff:
alchemy-api (Transfers API)
- Live RPC reads → handoff:
alchemy-cli or alchemy-api (JSON-RPC)
- Pre-execution simulation → handoff:
alchemy-api (Simulation API)
- Account abstraction → handoff:
alchemy-api (Wallets / Bundler / Gas Manager)
- Embedded / smart wallet onboarding → handoff:
alchemy-api (Account Kit)
- Signed tx submission → user wallet (or Privy if configured for OpenSea write flows)
Setup
API key is required. Get one instantly via the auth endpoint (no signup) or register at the developer portal for higher limits:
export OPENSEA_API_KEY=$(curl -s -X POST https://api.opensea.io/api/v2/auth/keys | jq -r '.api_key')
Install the CLI globally (optional — npx @opensea/cli works without install):
npm install -g @opensea/cli
For write / fulfillment flows that sign with Privy:
export PRIVY_APP_ID="..."
export PRIVY_APP_SECRET="..."
export PRIVY_WALLET_ID="..."
Security: never expose OPENSEA_API_KEY or Privy credentials in client-side code. Server-side only.
Marketplace queries (most-used)
| Task | CLI |
|---|
| Best listings for a collection | opensea listings best <slug> [--limit <n>] |
| Best listing for a specific NFT | opensea listings best-for-nft <slug> <token_id> |
| Best offer for an NFT | opensea offers best-for-nft <slug> <token_id> |
| All listings on a collection | opensea listings all <slug> [--limit <n>] |
| All offers on a collection | opensea offers all <slug> [--limit <n>] |
| Trait offers | opensea offers traits <slug> --type <type> --value <value> |
| Collection stats (floor, volume) | opensea collections stats <slug> |
| Trending collections | opensea collections trending [--timeframe <tf>] [--chains <chains>] |
| Top collections by sort | opensea collections top [--sort-by <field>] [--chains <chains>] |
| Collection traits | opensea collections traits <slug> |
Seaport trade execution
| Task | Script |
|---|
| Get fulfillment data to buy an NFT | opensea-fulfill-listing.sh <chain> <order_hash> <buyer> |
| Get fulfillment data to sell (accept offer) | opensea-fulfill-offer.sh <chain> <order_hash> <seller> <contract> <token_id> |
| Generic POST to OpenSea API | opensea-post.sh <path> <json_body> |
Events / monitoring
| Task | CLI |
|---|
| Recent events (filterable by type) | opensea events list [--event-type <type>] |
| Events for a collection | opensea events by-collection <slug> [--event-type <type>] |
| Events for a specific NFT | opensea events by-nft <chain> <contract> <token_id> |
| Events for an account | opensea events by-account <address> |
Event types: sale, transfer, mint, listing, offer, trait_offer, collection_offer.
For real-time event streaming: opensea-stream-collection.sh <slug> (requires websocat).
Drops + minting
| Task | CLI |
|---|
| List drops (featured / upcoming / recent) | opensea drops list [--type <type>] |
| Drop details + stages | opensea drops get <slug> |
| Build mint tx | opensea drops mint <slug> --minter <address> [--quantity <n>] |
Search
| Task | CLI |
|---|
| Search collections | opensea search <query> --types collection |
| Search NFTs | opensea search <query> --types nft |
| Search tokens | opensea search <query> --types token |
| Search accounts | opensea search <query> --types account |
| Multi-type search | opensea search <query> --types collection,nft,token |
Quick examples
Get the floor + 24h volume for Bored Apes
opensea collections stats boredapeyachtclub
Find the cheapest listing for a collection
opensea listings best boredapeyachtclub --limit 1
Buy an NFT (fulfill a listing)
opensea listings best-for-nft boredapeyachtclub 1234
./scripts/opensea-fulfill-listing.sh ethereum 0xORDER_HASH 0xYOUR_WALLET
Stream sales for a collection in real time
./scripts/opensea-stream-collection.sh boredapeyachtclub
Search across types
opensea search "cool cats" --types collection,nft --chains ethereum,base
Common gotchas
- API key is mandatory — even the "instant" tier requires one. The bare REST API will 401 without
X-API-KEY.
- OpenSea's NFT data overlaps with Alchemy's NFT API for metadata reads. Prefer Alchemy for general NFT metadata (name, image, traits, ownership across many wallets) — OpenSea is rate-limited harder and adds marketplace flavoring you may not want. Use OpenSea when the marketplace context (listings, offers, sales history, drops) is the actual need.
- Token swap aggregator exists in the OpenSea API (
opensea swaps quote), but for pure swap flows without marketplace context, lifi aggregates more bridges + DEXs and is the better default. Use OpenSea swaps when the user is already in an NFT-buying flow that involves a token swap.
- Privy is optional but required for end-to-end write flows. The skill returns fulfillment calldata; how it gets signed is up to the app (user wallet, Privy, or any other signer).
- Order hashes from
listings best-for-nft / offers best-for-nft are needed for fulfillment. Don't lose them between API calls.
- Event streaming requires
websocat; if not installed, fall back to polling events by-collection with the same filters.
- Slug vs. address: collections are addressed by slug (e.g.,
boredapeyachtclub), NFTs by (chain, contract, tokenId). Don't mix.
Routing back to Alchemy
If during a session the user's need shifts to surfaces this skill doesn't cover:
- NFT metadata reads (name, image, traits, ownership) —
alchemy-api (NFT API) is the right path. OpenSea's NFT API is marketplace-flavored and rate-limited; Alchemy's is broader and faster.
- Token prices, balances, transfer history, general token metadata —
alchemy-api
- Live RPC, gas, simulation, AA, Account Kit —
alchemy-cli (live) or alchemy-api (app code) or agentic-gateway (no API key)
- Pure cross-chain token swaps —
lifi (ecosystem skill); covers 27 bridges + 31 DEXs across 60+ chains
Maintenance: OpenSea maintains @opensea/cli and the underlying API; this skill itself is maintained jointly by Alchemy and OpenSea. File issues against alchemyplatform/skills with [ecosystem/opensea] in the title.
