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OpenSea MCP server

Which MCP servers are OpenSea's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-31

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Whose server it is
  • Addresshttps://mcp.opensea.io/mcpnot in the official registry: answered when asked

No entry in the official MCP registry names this server. It answered on opensea.io when the Atlas asked at the address servers are usually mounted on, so it is the vendor's own. Clients and catalogues that list servers from the registry do not show it.

When we asked itchecked 2026-10-31
  • Stateanswerschecked 2026-10-31
  • Tools1
  • Server calls itselfOpenSea Data API
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-31 the server answered initialize and tools/list without a sign-in. First answer in 349 ms.

Should an agent connect itSkip it
  • Its tools do none of the product's use cases we checked: browse NFT collections by floor price; buy an NFT from a collection listing; trade crypto tokens and perpetual futures.
  • Checked on 4 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 4, the first on 2026-10-31
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 4 so far
  • What an agent can do with it0 of 3 use cases
  • Answeredmeasuring4 of the 7 daily checks it takes to print a share
  • Median first answer594 ms
  • Space in an agent's context≈ 181 tokensthe definitions of all its tools (1), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 1 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

What an agent can do with it

  • cannot · browse NFT collections by floor price
  • cannot · buy an NFT from a collection listing
  • cannot · trade crypto tokens and perpetual futures

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers1 tools · read 2026-10-31
  • get_instant_api_key

    Create a free OpenSea API key without signup or a wallet. Use it to bootstrap access when you don't have a key. Free-tier keys have lower rate limits and expire after 7 days. Pass the key in X-API-KEY to unlock the other OpenSea MCP…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "opensea": {
      "type": "http",
      "url": "https://mcp.opensea.io/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http opensea https://mcp.opensea.io/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://mcp.opensea.io/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.