Project Gumball MCP server

Which MCP servers are Project Gumball'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 2026-10-20

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Whose server it is

Registry namecom.gumballtools/amortizeverified in the MCP registry

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

When we asked itchecked 2026-10-20

Stateanswerschecked 2026-10-20
Tools1
Server calls itselfamortize
Server version0.1.0
Protocol version2025-06-18

On 2026-10-20 the server answered initialize and tools/list without a sign-in. First answer in 890 ms.

Should an agent connect itNot proven either way yet

Whether its tools do the product's job has not been judged yet.

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: 7, the first on 2026-10-20

INITE MCP score100 of 100answers 100 · definitions 100 · context 100 · connects 100
Answered100% of days7 of 7 daily checks
Median first answer827 ms
Space in an agent's context≈ 1,372 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

not sure · Check whether a regex can hang on backtracking
cannot · Convert times across zones and flag nonexistent local times

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 2026-10-20

amortize
Builds the full row-by-row amortization schedule for a loan — interest, principal, PMI, and running balance for every payment — instead of just the monthly payment amount. Use this whenever a row-by-row schedule matters: "what is my…

How to connect

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

{
  "mcpServers": {
    "amortize": {
      "type": "http",
      "url": "https://amortize.gumballtools.com/api/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http gumballtools https://amortize.gumballtools.com/api/mcp

Add to Cursor Add to VS Code

claude.ai, ChatGPT and other clients: add https://amortize.gumballtools.com/api/mcp as a custom connector in the settings.

Other servers listed as Project Gumball's

com.gumballtools/body-metricsanswers, 1 toolsverified in the MCP registry
com.gumballtools/check-digitanswers, 1 toolsverified in the MCP registry
com.gumballtools/color-companionnot asked yetverified in the MCP registry
com.gumballtools/due-datenot asked yetverified in the MCP registry
com.gumballtools/equation-stepsnot asked yetverified in the MCP registry
com.gumballtools/iso-weeknot asked yetverified in the MCP registry
com.gumballtools/json-to-typesnot asked yetverified in the MCP registry
com.gumballtools/payload-validatornot asked yetverified in the MCP registry
com.gumballtools/penny-roundingnot asked yetverified in the MCP registry
com.gumballtools/platformnot asked yetverified in the MCP registry
com.gumballtools/regex-explainernot asked yetverified in the MCP registry
com.gumballtools/sports-rulesnot asked yetverified in the MCP registry
com.gumballtools/timezone-truthnot asked yetverified in the MCP registry
com.gumballtools/words-in-contextnot asked yetverified in the MCP registry

OpenAPI spec

1 paths, read 2026-10-20. Open the spec ↗

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.