Fatstack MCP server

Which MCP servers are Fatstack'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 2026-10-26

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Whose server it is

Registry namenet.fatstack/registryverified in the MCP registry

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

When we asked itchecked 2026-10-26

Stateanswerschecked 2026-10-26
Tools15
Server calls itselffatstack
Server version1.0.0
Protocol version2025-06-18

On 2026-10-26 the server answered initialize and tools/list without a sign-in. First answer in 87 ms.

Should an agent connect itNot proven either way yet

Its tools do every use case we checked: convert CSV files into JSON rows; translate cron expressions into readable descriptions.
Checked on 2 of the 7 days it takes to judge reliability.

Once connected

For "convert CSV files into JSON rows", the likely first call is csv-to-json__csv_to_json.
For "translate cron expressions into readable descriptions", the likely first call is cron-explain__cron_explain.
Parameters are untyped or undescribed in 9 of 15 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 2026-10-26

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 answer214 ms
Space in an agent's context≈ 4,453 tokensthe definitions of all its tools (15), which an agent carries on every turn
Tool definitionsC · 72 of 100
Typed results0 of 15 toolsdeclared outputSchema: results come typed, read once

Parameters without a type: in 1 of 15
Parameters without a description: in 9 of 15
Not saying whether it only reads or can destroy: 15 of 15

What an agent can do with it

not sure · parse caller-supplied HTML into structured JSON
can do · convert CSV files into JSON rows
can do · translate cron expressions into readable descriptions

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 offers15 tools · read 2026-10-26

fatstack__free_demo
**FREE DEMO — $0.00, no wallet, no payment.** First-party tool served by Fatstack itself, not a marketplace listing. Call it to confirm your MCP client is wired up correctly. Every other tool here is a paid listing: calling one returns…
echo__echo_json
$0.001000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
json-schema-validate__json_schema_validate
$0.001000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
html-to-markdown__html_to_markdown
$0.001000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
url-metadata__url_metadata
$0.010000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
csv-to-json__csv_to_json
$0.001000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
text-language-detect__text_language_detect
$0.000500 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
regex-test__regex_test
$0.000500 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
unit-convert__unit_convert
$0.000500 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
cron-explain__cron_explain
$0.000500 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
uuid-batch__uuid_batch
$0.000500 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
markdown-lint__markdown_lint
$0.001000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
askzephy-quick-scan__sol_audit
$0.005000 USDC per call on eip155:8453, paid directly to the provider (0xf4729bec220090ef08c786e9142898354178771e). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
askzephy-quick-scan__sol_quick_scan
$0.005000 USDC per call on eip155:8453, paid directly to the provider (0xf4729bec220090ef08c786e9142898354178771e). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…
askzephy-quick-scan__google_news_feed
$0.005000 USDC per call on eip155:8453, paid directly to the provider (0xf4729bec220090ef08c786e9142898354178771e). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool…

How to connect

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

{
  "mcpServers": {
    "registry": {
      "type": "http",
      "url": "https://www.fatstack.net/api/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http fatstack https://www.fatstack.net/api/mcp

Add to Cursor Add to VS Code

claude.ai, ChatGPT and other clients: add https://www.fatstack.net/api/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.