# 0s and 1s

**Canonical:** https://apis.io/providers/0sand1s-co-uk/  
**Website:** https://0sand1s.co.uk/  
**APIs profiled:** 1

0s and 1s provides free CIS (Construction Industry Scheme) software for UK contractors, offering tools to verify subcontractors, record payments, file CIS300 returns, send statements, and calculate deductions and penalties. The platform runs on a free API and MCP server, integrates with HMRC data, and is operated by Voll Studios Ltd. It aims to simplify contractor payroll compliance and reporting.

## Kin Score — 53.0 / 100 (developing)

Scored 2026-11-02 under rubric 0.26.0. Trend: flat (+0.0 from 53.0).

| Facet | Score |
|---|---|
| Discoverability | 65.0 |
| Contract Quality | 58.7 |
| Contract Governance | 19.7 |
| Operational Transparency | 31.6 |
| Developer Ergonomics | 49.3 |
| Access Clarity | 65.8 |

Regulatory layer — **Employment & Payroll**: 34.3 (matched via tags).

## Agent readiness — 39.3 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | verified |
| OpenAPI Examples | verified |
| Rate Limit Signal | verified |
| Event Surface Described | no |
| Agent Skills | unknown |
| Well Known Catalog | yes |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | no |
| MCP Tool Quality | na |

## Access

Paid · Open access — onboarding: open, pricing: paid, trial: no (confidence: high).

## APIs (1)

- **0s and 1s CIS API** — The CIS API from 0s and 1s — 7 operation(s) for cis.

## MCP servers (1)

- **0s and 1s MCP Server** — Remote MCP server at 0sand1s.co.uk.

## Agentic access (1)

- **0Sand1S Co Uk Agentic Access** — 14 operations · 7 acting

## Security (3)

- **0Sand1S Co Uk Authentication** — 0 schemes
- **0Sand1S Co Uk Domain Security** — TLSv1.3 · HSTS
- **0Sand1S Co Uk Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **0Sand1S Co Uk Plans Pricing**

## Tags

Construction, Payroll, Tax, United Kingdom, Software, CIS

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/0sand1s-co-uk/). Scores are computed from the provider's own public artifacts under a published rubric.