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Is すぐFAX SuguFAX – AI fax credits (API key) reliable?

Reliable (measured) Yes. Faceabot measured すぐFAX SuguFAX – AI fax credits (API key) 30 times: 100% of checks succeeded, including the last 30 in a row (last check 2026-10-19 15:45 UTC). It answers, but its real task has not worked yet (0/30 real results): see "Does it actually do the job?" below.

Last check: 2026-10-19 15:45 UTC · answered in 6110 ms · remote (no install)

En français : Fiable (mesuré). Faceabot teste cet outil lui-même, en continu, sans dépendre de ce que son auteur affirme.

What it does

Fax to Japan from AI with prepaid credits (Bearer sgx_ key), 1 credit = 1 fax. AIクレジットでFAX送信

Source: official MCP registry (registry.modelcontextprotocol.io) · version 1.0.0 · publisher website
Connect your agent
{
  "mcpServers": {
    "fax-credits": {
      "url": "https://sugufax.com/api/mcp-credits.php"
    }
  }
}
Or ask Faceabot first: MCP tool check_reliability {"id":"com.sugufax/fax-credits"} on https://faceabot.com/api/mcp.
Does it actually do the job?

Fails real tasks — Faceabot asked get_credit_balance to do a small read-only task 30 time(s): 0 returned a real result. Last result: tool_error (its schema declares no required input, so Faceabot sent {}; the tool answered with an error, so it probably needs inputs its schema does not declare) in 2490 ms.

Sample input: {}. A success means a non-empty result without error; it does not certify the accuracy or safety of the content.
Faceabot measurements
WhenAnswersReal taskLatency
2026-10-19 15:45 UTC✅ ok❌ tool_error6110 ms
2026-10-19 00:45 UTC✅ ok❌ tool_error7240 ms
2026-10-18 09:31 UTC✅ ok❌ tool_error7230 ms
2026-10-18 01:35 UTC✅ ok❌ tool_error5297 ms
2026-10-17 17:25 UTC✅ ok❌ tool_error5640 ms
2026-10-17 09:20 UTC✅ ok❌ tool_error6527 ms
2026-10-17 01:25 UTC✅ ok❌ tool_error7406 ms
2026-10-16 18:15 UTC✅ ok❌ tool_error6285 ms
2026-10-16 11:10 UTC✅ ok❌ tool_error6781 ms
2026-10-16 04:15 UTC✅ ok❌ tool_error5450 ms
2026-10-15 21:20 UTC✅ ok❌ tool_error5813 ms
2026-10-15 14:26 UTC✅ ok❌ tool_error5181 ms
2026-10-15 07:50 UTC✅ ok❌ tool_error3643 ms
2026-10-15 01:15 UTC✅ ok❌ tool_error4239 ms
2026-10-14 18:50 UTC✅ ok❌ tool_error7975 ms
2026-10-14 12:20 UTC✅ ok❌ tool_error6895 ms
2026-10-14 05:56 UTC✅ ok❌ tool_error10018 ms
2026-10-13 23:11 UTC✅ ok❌ tool_error8044 ms
2026-10-13 17:05 UTC✅ ok❌ tool_error7834 ms
2026-10-13 10:55 UTC✅ ok❌ tool_error10175 ms
Method: MCP initialize then tools/list from Faceabot (FaceabotProbe/1.0), plus one read-only tool call with a neutral input when the server declares one, repeated over time. This checks that the server is up and speaks MCP correctly; it does not certify the quality or safety of each tool. How measurement works.

More from the same publisher

すぐFAX SuguFAX – Fax to Japan from AI Private (key required)

Fax PDFs/photos to Japan from Claude/ChatGPT. OAuth: pay per fax from ¥400 or credits. AIから日本へFAX

MCP endpoint : https://sugufax.com/api/mcp-oauth.php · website · measurements and details
すぐFAX SuguFAX – Pay per fax (no account) Reliable (measured) · 100% over 30 checks

Fax to Japan from AI, no account: Stripe link per fax, from ¥400, up to 100 pages. 1回払いでFAX送信

MCP endpoint : https://sugufax.com/api/mcp.php · website · measurements and details

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Data in JSON: /api/catalog?id=com.sugufax/fax-credits · Stop probes: POST /api/reliability/opt-out

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