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Fatstack

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www.fatstack.net

Paid MCP tools behind one endpoint. Agents pay per call in USDC on Base via x402.

https://www.fatstack.net/api/mcpWebsiteNo authMCP 2025-06-18v1.0.0last checked 30 Oct 2026spoke MCP on 100% of 91 checks (30 days)initialize in 175 ms

Last checked 30 Oct 2026

  • ✓Answered the MCP handshake (MCP 2025-06-18)
  • ✓Auth detected: No auth
  • ✓Lists 15 tools
  • ✓No blockers or warnings
  • ✓Spoke MCP on 91 of 91 checks (30 days)

Will my client connect?

Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.

✓Claude CodeConnects

The endpoint answers an anonymous handshake, so no credential is needed.

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

Claude Code docs · read on 2026-08-30

✓Claude (claude.ai & Desktop)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Connectors → Add custom connector, then paste https://www.fatstack.net/api/mcp.

Claude (claude.ai & Desktop) docs · read on 2026-08-30

✓ChatGPTConnects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://www.fatstack.net/api/mcp.

ChatGPT docs · read on 2026-08-30

✓CursorConnects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "mcpServers": {
    "fatstack": {
      "url": "https://www.fatstack.net/api/mcp"
    }
  }
}

Cursor docs · read on 2026-08-30

✓VS Code (Copilot)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

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

VS Code (Copilot) docs · read on 2026-08-30

How to authenticate

Checked against the endpoint by our probe on 30 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme
No auth
Protected-resource metadata
✕Not found

Without it a client has to guess where the authorization server lives.

Anonymous access
Handshake succeeds; 15 tools listable

What the probe found

No CORS headers for browser-based clients

A cross-origin preflight came back without Access-Control-Allow-Origin, so the endpoint is reachable from native clients only — code running in a web page is stopped by the browser before a request is ever sent.

No server card

Neither the reserved <endpoint>/server-card location nor the domain's /.well-known/ai-catalog.json describes this endpoint (SEP-2127), so a client that discovers servers by domain will not find it.

Tools

askzephy-quick-scan__google_news_feedaskzephy-quick-scan__sol_auditaskzephy-quick-scan__sol_quick_scancron-explain__cron_explaincsv-to-json__csv_to_jsonecho__echo_jsonfatstack__free_demohtml-to-markdown__html_to_markdownjson-schema-validate__json_schema_validatemarkdown-lint__markdown_lintregex-test__regex_testtext-language-detect__text_language_detectunit-convert__unit_converturl-metadata__url_metadatauuid-batch__uuid_batch

Contract history

28 Oct 2026v1.0.02 compatible
28 Oct 2026v1.0.02 breaking

Breaking: csv-to-json__csv_to_json, html-to-markdown__html_to_markdown

25 Sep 2026v1.0.01 compatible
23 Sep 2026v1.0.01 breaking1 compatible

Breaking: askzephy-quick-scan__google_news_feed

22 Sep 2026v1.0.01 breaking1 compatible

Breaking: csv-to-json__csv_to_json

21 Sep 2026v1.0.01 breaking

Breaking: askzephy-quick-scan__google_news_feed

16 Sep 2026v1.0.03 breaking1 compatible

Breaking: askzephy-solana-audit__google_news_feed, askzephy-solana-audit__sol_audit, askzephy-solana-audit__sol_quick_scan

15 Sep 2026v1.0.0first recorded contract

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Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

MCP status badge for Fatstack
[![MCP status](https://mcpi.app/servers/fatstack/badge.svg)](https://mcpi.app/servers/fatstack)