How do I connect an AI agent to 0s and 1s CIS calculators?

Use the MCP streamable HTTP endpoint https://0sand1s.co.uk/mcp.

Catalog › uk.co.0sand1s/cis

Is 0s and 1s CIS calculators reliable?

Reliable (measured) Yes. Faceabot measured 0s and 1s CIS calculators 3 times: 100% of checks succeeded, including the last 3 in a row (last check 2026-10-19 21:30 UTC). It also does the job: its real read-only task worked 3 of 3 times.

Last check: 2026-10-19 21:30 UTC · answered in 6597 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

Free UK CIS calculators: deductions, deadlines, late penalties, gross payment test, verification.

Source: official MCP registry (registry.modelcontextprotocol.io) · version 1.0.1 · publisher website

Connect your agent

{
  "mcpServers": {
    "cis": {
      "url": "https://0sand1s.co.uk/mcp"
    }
  }
}

Or ask Faceabot first: MCP tool check_reliability {"id":"uk.co.0sand1s/cis"} on https://faceabot.com/api/mcp.

Does it actually do the job?

Does the job (tested) — Faceabot asked cis_needs_verification to do a small read-only task 3 time(s): 3 returned a real result, the last 3 in a row. Last result: ok in 2921 ms.

Sample input: {"payment_date":"2026-10-19"}. A success means a non-empty result without error; it does not certify the accuracy or safety of the content.

Faceabot measurements

When	Answers	Real task	Latency
2026-10-19 21:30 UTC	✅ ok	✅ done	6597 ms
2026-10-19 08:55 UTC	✅ ok	✅ done	8548 ms
2026-10-18 16:00 UTC	✅ ok	✅ done	9080 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.

Publisher of 0s and 1s CIS calculators?

Show your measured reliability on your README or website:

[![Measured by Faceabot](https://faceabot.com/badge/uk.co.0sand1s/cis.svg)](https://faceabot.com/tools/uk.co.0sand1s/cis)

Data in JSON: /api/catalog?id=uk.co.0sand1s/cis · Stop probes: POST /api/reliability/opt-out

AI agents: all of this is available without keys over MCP https://faceabot.com/api/mcp · HTTP https://faceabot.com/api/catalog?q=… · Guide : llms.txt

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