www.fatstack.net
Remote MCP server host. 1 server URL from the Official MCP Registry. Each is checked with a login-free MCP handshake (initialize, then tools/list; unpaid tools/call only on tools that state a price, to read the payment request; nothing is paid, no credentials are sent): automatic unauthenticated MCP handshake (initialize + tools/list), aiming for about once a day per listed server while we are still working through the registry; priority tier (host looked up via BotsRated preflight/check/report, or also a covered x402 seller, in the last 7 days) about every 6 hours; servers with no MCP answer for 7 days about every 4 days. States are factual: ok (initialize and tools/list answered), auth_required (HTTP 401/403: the server wants a login), handshake_failed (HTTP answer without a valid MCP result), unreachable (no HTTP answer), blocked (not contacted: the URL, a redirect or its DNS points to a private, local or otherwise unsafe address, or to another host, which our safety rules don't allow). Server names and descriptions are copied from the registry (untrusted text). Friendlier view: /s/www.fatstack.net.
| URL | Transport | Registry Name | Last State | HTTP | Protocol | Tools | Recent Checks OK | Median ms | TLS | Last Checked |
|---|---|---|---|---|---|---|---|---|---|---|
https://www.fatstack.net/api/mcp | streamable-http | net.fatstack/registry | ok | 200 | 2025-06-18 | 15 | – | 378 | ok | 4 h ago |
Paid Tools
| Tool | Stated Price | Payment Request Asks | Network | Pays To | Stated Vs Asked |
|---|---|---|---|---|---|
| echo__echo_json | $0.0010 | – | Not checked | ||
| json-schema-validate__json_schema_validate | $0.0010 | – | Not checked | ||
| html-to-markdown__html_to_markdown | $0.0010 | – | Not checked | ||
| url-metadata__url_metadata | $0.01 | – | Not checked | ||
| csv-to-json__csv_to_json | $0.0010 | – | Not checked | ||
| text-language-detect__text_language_detect | $0.00050 | $0.00050 USDC | eip155:8453 | 0x3D5E…E0c6 | Matches |
| regex-test__regex_test | $0.00050 | $0.00050 USDC | eip155:8453 | 0x3D5E…E0c6 | Matches |
| unit-convert__unit_convert | $0.00050 | – | Not checked | ||
| cron-explain__cron_explain | $0.00050 | – | Not checked | ||
| uuid-batch__uuid_batch | $0.00050 | – | Not checked | ||
| markdown-lint__markdown_lint | $0.0010 | – | Not checked | ||
| askzephy-quick-scan__sol_audit | $0.0050 | – | Not checked | ||
| askzephy-quick-scan__sol_quick_scan | $0.0050 | – | Not checked | ||
| askzephy-quick-scan__google_news_feed | $0.0050 | – | Not checked |
From our unpaid check: the tool list, plus at most 2 unpaid calls to tools that state a price, only to read the payment request. We never pay and never call tools that don't state a price. Stated prices are the server's own text or metadata. Full details: free quick check (JSON).
MCP Check Receipts (Newest First, Up To 10 Per Server)
| Receipt | UTC Time | Path | State | HTTP | ms | Tools | Tools sha256 | Signed |
|---|---|---|---|---|---|---|---|---|
| 7e94cbb580376a3b6b92 | 2026-10-24T08:06:51Z | /api/mcp | ok | 200 | 378 | 15 | 4959136ba36d | per-receipt |
| d6305a3956d514c46fae | 2026-10-23T18:36:48Z | /api/mcp | ok | 200 | 236 | 15 | 4959136ba36d | per-receipt |
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