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Which MCP servers are SpreadBench'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 2026-11-03

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Whose server it is
  • Registry namecom.spreadbench/ncsxverified in the MCP registry

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

When we asked itchecked 2026-11-03
  • Stateanswerschecked 2026-11-03
  • Tools7
  • Server calls itselfncsx
  • Server version0.1.0
  • Protocol version2025-03-26

On 2026-11-03 the server answered initialize and tools/list without a sign-in. First answer in 415 ms.

Should an agent connect itNot proven either way yet
  • Its tools do every use case we checked: track neocloud bond spreads against composite benchmarks; pull spread history into scripts via API.
  • Checked on 2 of the 7 days it takes to judge reliability.

Once connected

  • For "pull spread history into scripts via API", the likely first call is ncsx_levels.

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 2026-11-03
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
  • What an agent can do with it2 of 2 use cases
  • Answeredmeasuring2 of the 7 daily checks it takes to print a share
  • Median first answer499 ms
  • Space in an agent's context≈ 475 tokensthe definitions of all its tools (7), which an agent carries on every turn
  • Tool definitionsB · 83 of 100
  • Typed results0 of 7 toolsdeclared outputSchema: results come typed, read once
  • Not saying whether it only reads or can destroy: 7 of 7

What an agent can do with it

  • can do · track neocloud bond spreads against composite benchmarks
  • can do · pull spread history into scripts via API
  • not sure · attribute daily spread moves in basis points

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 offers7 tools · read 2026-11-03
  • ncsx_latest

    Get the latest NCSX index levels (Composite / HY / IG) with daily & weekly changes, 90-day percentiles, as-of date, methodology version, DOI and data_status. Read data_status before quoting: "seed" means demo series, "verified" means…

  • ncsx_levels

    Get the 90-trading-day daily level series for one NCSX index tier (composite | hy | ig).

  • ncsx_bond

    Get the profile and 30-day spread path of one constituent bond by CUSIP (e.g. US21873SAC26).

  • ncsx_constituents

    List all constituent bonds (issuer, coupon, maturity, rating, tier, spread) with identifier verification status.

  • ncsx_attribution

    Get this week's index change attribution (which bonds moved the index, in bp).

  • ncsx_methodology

    Get methodology metadata: version, DOI, license, formulas, data source licensing status.

  • ncsx_weekly

    Get the latest weekly report snapshot (levels, weekly changes, attribution, citation string).

How to connect

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

{
  "mcpServers": {
    "ncsx": {
      "type": "http",
      "url": "https://spreadbench.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http spreadbench https://spreadbench.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://spreadbench.com/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.