A2A Agent Card · OpenSea

OpenSea

Discover, buy, sell, and mint NFTs and swap tokens across dozens of blockchains. The OpenSea agent exposes real-time NFT, token, collection, wallet, and marketplace data and actions via the OpenSea MCP server.

Open the live agent card → Agent endpoint OpenSea provider profile
Near-conformant. Correctly shaped against the A2A 1.0.0 AgentCard object, but omits optional fields an agent may expect.
Provider: OpenSea Conformance: Near-Conformant Protocol: 0.2.5 Transport: streamable-http Version: 1.0.0 Host: opensea.io Skills: 7
Discovery

An A2A client finds this agent by fetching the well-known path on the provider's own host. That is what makes an agent card different from every other agent artifact in this catalog: it is provider-published by construction — it cannot be derived, generated, or reconstructed on a provider's behalf.

https://opensea.io/.well-known/agent-card.json
Interfaces
https://mcp.opensea.io/mcp · transport streamable-http · protocol non-standard supportedInterfaces
Skills (7)

Search OpenSea search

Search across NFTs, tokens, collections, and agent tools with a single query.

searchdiscoverynfttoken

NFT and item data nft-data

Fetch NFTs, item details, ownership, rarity, live listings, and offers.

nftitemslistingsoffers

Token and market data token-data

Fetch fungible tokens, balances, prices, and trending or top tokens.

tokenpricesmarket

Collection data collection-data

Fetch collections, floor prices, stats, and trending or top collections.

collectionstatsfloor-price

Token swap quotes swap-quote

Get DEX-aggregated ERC-20 token swap quotes across supported chains.

swapdefiquote

Account and portfolio account-portfolio

Look up accounts, profiles, NFT and token balances, favorites, and activity.

accountportfolioprofile

Marketplace actions marketplace-actions

Create and cancel orders, manage drops, collections, profile, wallets, and watchlists (OAuth-scoped).

ordersdropsmanageoauth
Documentation
https://docs.opensea.io/reference/mcp
Evidence. Fetched 2026-07-28 from https://opensea.io/.well-known/agent-card.json, HTTP 200. The body was saved verbatim and is the sole source for everything on this page — no field is inferred. View the captured card. Providers change what they serve; if this card has moved or changed shape, the provider profile carries the current state as of the last build.

Work with this as data

Every agent card here is available over the APIs.io API and to AI agents over MCP. A2A Agent Cards is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for a2a agent cards

3 MCP tools reach this
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
Search the catalog 
curl "https://apis.io/api/v1/search?q=opensea&limit=10"
Everything under a tag 
curl "https://apis.io/api/v1/tags/opensea"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

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A second provider on the same verified email joins the account you already have.