OpenSea

OpenSea is the world's largest NFT marketplace, offering a REST API for querying NFT collections, listings, offers, orders, and events, and for managing programmatic NFT trading across 27+ blockchain chains including Ethereum, Polygon, Base, Solana, Arbitrum, and more.

OpenSea publishes 11 APIs on the APIs.io network, including NFT API, Collection API, Listing API, and 8 more. Tagged areas include NFT, Marketplace, Web3, Blockchain, and Trading.

The OpenSea catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

OpenSea’s developer surface includes authentication, CLI, support, engineering blog, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

50.7/100 developing ▼ -7.9 Agent 35/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6

12 APIs

NFTMarketplaceWeb3BlockchainTradingDigital Assets

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 50.7/100 · developing

Contract Quality 12.1 / 25

Developer Ergonomics 6.1 / 20

Commercial Clarity 10.0 / 20

Operational Transparency 6.2 / 13

Governance 7.0 / 12

Discoverability 7.4 / 10

Agent readiness — 35/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/opensea: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 12

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Opensea Rate Limits

4 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

JSON Schema 220

Standalone JSON Schema definitions for this provider's data models.

Scroll for all 220

Examples 83

Example request and response payloads for these APIs.

Scroll for all 83

Documentation 1

Reference material describing how the API behaves

OpenAPI

OpenAPI

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

CLI

CLI

Access & Security 4

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Authentication

Authentication

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

StatusPage

StatusPage

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

PrivacyPolicy

Company 1

The organization behind the API

Blog

Blog

Other 1

Properties that don't map to a standard resource type

AgentCard

AgentCard

Source (apis.yml)

aid: opensea
url: https://raw.githubusercontent.com/api-evangelist/opensea/refs/heads/main/apis.yml
name: OpenSea
kind: company
description: OpenSea is the world's largest NFT marketplace, offering a REST API for querying NFT collections, listings, offers,
  orders, and events, and for managing programmatic NFT trading across 27+ blockchain chains including Ethereum, Polygon,
  Base, Solana, Arbitrum, and more.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- NFT
- Marketplace
- Web3
- Blockchain
- Trading
- Digital Assets
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
apis:
- aid: opensea:nft-api
  name: OpenSea NFT API
  description: Retrieve individual NFT metadata, ownership, rarity, analytics, and owners across supported blockchain chains.
    Supports batch NFT retrieval, metadata refresh, validation, and collection-based listing.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - NFT
  - Metadata
  - Ownership
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- aid: opensea:collection-api
  name: OpenSea Collection API
  description: Query NFT collection details, traits, floor prices, holders, offer aggregates, trending and top collections.
    Supports batch retrieval by slugs and discovery of new and popular collections.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - Collections
  - Discovery
  - Floor Price
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- aid: opensea:listing-api
  name: OpenSea Listing API
  description: Create, fulfill, and query NFT listings on OpenSea. Supports best listing retrieval per collection or NFT,
    cross-chain fulfillment, and collection sweep purchases with automatic substitution for unavailable items.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - Listings
  - Marketplace
  - Trading
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- aid: opensea:offer-api
  name: OpenSea Offer API
  description: Build, create, fulfill, and query NFT offers and bids on OpenSea. Supports collection-wide offers, trait-based
    offers, item-specific bids, and best-offer retrieval per NFT.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - Offers
  - Bids
  - Marketplace
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- aid: opensea:order-api
  name: OpenSea Order API
  description: Look up and cancel individual orders by chain, protocol address, and order hash. Supports both Seaport listing
    and offer orders.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - Orders
  - Seaport
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- aid: opensea:events-api
  name: OpenSea Events API
  description: Retrieve historical NFT marketplace events including sales, transfers, mints, and cancellations by account,
    collection, or individual NFT. Also supports real-time event streaming via the Stream API WebSocket.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - Events
  - Analytics
  - History
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- aid: opensea:token-api
  name: OpenSea Token API
  description: Retrieve fungible token details, balances, holders, liquidity pools, price history, OHLCV candlestick data,
    trending tokens, and swap quotes for token trading across supported chains.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - Tokens
  - DeFi
  - Price
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- aid: opensea:account-api
  name: OpenSea Account API
  description: Retrieve OpenSea account profiles, resolve ENS/usernames, and access portfolio analytics including net worth
    history, P&L tracking, owned collections, favorites, listings, and offers.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - Accounts
  - Portfolio
  - Identity
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- aid: opensea:drops-api
  name: OpenSea Drops API
  description: Discover NFT drops, check mint eligibility, build mint transactions, deploy NFT contracts, and track transaction
    receipts for minting operations.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - Drops
  - Minting
  - Contracts
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- aid: opensea:search-api
  name: OpenSea Search API
  description: Search across OpenSea collections, NFTs, tokens, and accounts by keyword. Powers discovery of assets and creators
    across the OpenSea marketplace.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - Search
  - Discovery
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- aid: opensea:stream-api
  name: OpenSea Stream API
  description: Real-time WebSocket event streaming for NFT marketplace activity per collection, including item listed, item
    sold, item transferred, item metadata updates, item cancelled, item received offer, and item received bid events.
  humanURL: https://docs.opensea.io/reference/stream-js
  baseURL: wss://stream-api.opensea.io/socket
  tags:
  - WebSocket
  - Streaming
  - Real-time
  - Events
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/stream-js
  - type: SDKs
    url: https://github.com/ProjectOpenSea/stream-js
- aid: opensea:swap-api
  name: OpenSea Swap API
  description: Get swap quotes and execute token trading with executable transaction data across supported blockchain chains.
  humanURL: https://docs.opensea.io/reference/api-overview
  baseURL: https://api.opensea.io/api/v2
  tags:
  - Swap
  - DeFi
  - Trading
  properties:
  - type: Documentation
    url: https://docs.opensea.io/reference/api-overview
  - type: OpenAPI
    url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
common:
- type: AgentCard
  url: a2a/opensea-a2a.yml
  name: A2A Agent Card
  description: Agent Card served at /.well-known/agent-card.json (near-conformant against A2A 1.0.0).
- type: AgenticAccess
  url: agentic-access/opensea-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/opensea-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/opensea-domain-security.yml
- type: Authentication
  url: authentication/opensea-authentication.yml
- type: Authentication
  url: https://docs.opensea.io/reference/api-keys
- type: Plans
  url: plans/opensea-plans.yml
- type: RateLimits
  url: rate-limits/opensea-rate-limits.yml
- type: FinOps
  url: finops/opensea-finops.yml
- type: SDKs
  url: https://github.com/ProjectOpenSea/opensea-sdk
- type: CLI
  url: https://github.com/ProjectOpenSea/opensea-cli
- type: OpenAPI
  url: https://raw.githubusercontent.com/ProjectOpenSea/api-types/main/opensea-api.json
- type: TermsOfService
  url: https://opensea.io/tos
- type: PrivacyPolicy
  url: https://opensea.io/privacy
- type: StatusPage
  url: https://status.opensea.io
- type: Support
  url: https://support.opensea.io
- type: Blog
  url: https://opensea.io/blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

OpenSea

APIs 12

Pricing Plans 1

Rate Limits 1

FinOps 1

Semantic Vocabularies 1

Spectral Rules 1

JSON Schema 220