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x402 Supply MCP server

Which MCP servers are x402 Supply'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 2026-10-25

← Back to x402 Supply

Whose server it is
  • Registry namecom.x402supply/chess-evalverified in the MCP registry

The registry name sits under x402supply.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-25
  • Stateanswerschecked 2026-10-25
  • Tools2
  • Server calls itselfchess-eval
  • Server version0.1.0
  • Protocol version2025-06-18

On 2026-10-25 the server answered initialize and tools/list without a sign-in. First answer in 234 ms.

Should an agent connect itSkip it
  • Its tools do none of the product's use cases we checked: Check a Base token for owner admin powers; Pull current US Treasury par yield curve data; Read a public company's recent SEC filings.
  • Checked on 2 of the 7 days it takes to judge reliability.

Once connected

  • Parameters are untyped or undescribed in 2 of 2 tools: check arguments before calling.

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: 2, the first on 2026-10-25
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
  • What an agent can do with it0 of 3 use cases
  • Answeredmeasuring2 of the 7 daily checks it takes to print a share
  • Median first answer379 ms
  • Space in an agent's context≈ 239 tokensthe definitions of all its tools (2), which an agent carries on every turn
  • Tool definitionsC · 67 of 100
  • Typed results0 of 2 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 2 of 2
  • Not saying whether it only reads or can destroy: 2 of 2

What an agent can do with it

  • cannot · Check a Base token for owner admin powers
  • cannot · Pull current US Treasury par yield curve data
  • cannot · Read a public company's recent SEC filings

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 offers2 tools · read 2026-10-25
  • evaluate_position

    Evaluate a chess position with Stockfish: best move, centipawn/mate score, principal variation, and optional multipv. No mocks — a real single-threaded Stockfish 10 (asm.js) runs in-isolate per call.

  • best_line

    Play out Stockfish's predicted principal variation as SAN moves with a per-ply eval, re-searching after each ply.

How to connect

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

{
  "mcpServers": {
    "chess-eval": {
      "type": "http",
      "url": "https://chess-eval.x402supply.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http x402supply https://chess-eval.x402supply.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://chess-eval.x402supply.com/mcp as a custom connector in the settings.

Other servers listed as x402 Supply's
  • com.x402supply/endpoint-diligenceanswers, 3 toolsverified in the MCP registry
  • com.x402supply/entity-resolveanswers, 1 toolsverified in the MCP registry
  • com.x402supply/hts-classifynot asked yetverified in the MCP registry
  • com.x402supply/page-extractnot asked yetverified in the MCP registry
  • com.x402supply/pii-redactnot asked yetverified in the MCP registry

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.