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Fatstack
net.fatstack/registry in the official MCP registry.
Endpoint https://www.fatstack.net/api/mcp. Source: github.com/f4tst4ck/fatstack-tools.
The registry describes it as: Paid MCP tools behind one endpoint. Agents pay per call in USDC on Base via x402.
We read its 15 tools on 2026-10-27. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
fatstack__free_demo echo__echo_json json-schema-validate__json_schema_validate html-to-markdown__html_to_markdown url-metadata__url_metadata csv-to-json__csv_to_json text-language-detect__text_language_detect regex-test__regex_test unit-convert__unit_convert cron-explain__cron_explain uuid-batch__uuid_batch markdown-lint__markdown_lint askzephy-quick-scan__sol_audit askzephy-quick-scan__sol_quick_scan askzephy-quick-scan__google_news_feed
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/net-fatstack-registry)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.
Related
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| Citiview Agent Market com.citiviewgroup.mcp/agent-market | 200 tools, nothing matched 2026-10-26 |
| ScorpTech x402 API com.it.scorptech/x402 | 200 tools, nothing matched 2026-10-26 |
| Apex Edge — x402-paid machine services dev.pages.nonsynthetic/apex-edge | 200 tools, nothing matched 2026-10-23 |
| io.github.praneeth12098/x402-factory io.github.praneeth12098/x402-factory | 200 tools, nothing matched 2026-10-26 |