Briefcase

Briefcase is an AI-native accounting and bookkeeping automation platform for UK accounting firms and businesses. Founded in 2024 in London by Reuben Steenkamp and Ján Stehlík, and backed by Earlybird Venture Capital, Entrepreneur First and Tiny, Briefcase describes itself as building the world's first AI autopilot for accounting firms. The product uses multimodal AI and agentic workflows to automate the most tedious parts of accounting: extracting data from invoices, receipts and bank statements, categorising transactions against a firm's chart of accounts, handling VAT (with embedded HMRC legislation for standard, reverse-charge and zero-rated VAT), automating prepayments and expense claims, and driving month-end and financial close. It publishes results into Xero and QuickBooks. Briefcase is delivered as a cloud SaaS application (app.briefcase.so); it is a consumer of accounting APIs rather than a public API producer, and at the time of this profile it publishes no developer/API documentation, OpenAPI, or SDKs.

Briefcase is profiled on the APIs.io network. Tagged areas include Company, Accounting, Bookkeeping, Fintech, and Artificial Intelligence.

Briefcase’s developer surface includes pricing, engineering blog, changelog, support, signup flow, and 6 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

21.3/100 emerging ▬ flat Agent 0/100 human only Front door AI 6/6 dominant Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

0 APIs

Company Accounting Bookkeeping Fintech Artificial Intelligence Automation VAT Compliance AI Agents Software-as-a-Service United Kingdom

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 21.3/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 1.2 / 17

Access Clarity 10.7 / 17

Operational Transparency 1.7 / 11

Contract Governance 0.0 / 10

Discoverability 4.7 / 9

Regulatory Posture 1.9 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 7.1 — up to +18.6 composite points
Contract Governance scores 0.0 — up to +12.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/briefcase/apis.yml: open an issue on github.com/api-evangelist/briefcase to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Briefcase API pricing

Prices published by Briefcase, read 2026-10-07 from briefcase.so/pricing.

Plan	Price
Low	£19 a month + VAT Includes: Invoices and receipts 75 a quarter; Bank transactions Ledger 300 a quarter; Supplier payments 3 a qu
Medium	£39 a month + VAT Includes: Invoices and receipts 250 a quarter; Bank transactions Ledger 1,000 a quarter; Supplier payments 3 a
High	£79 a month + VAT Includes: Invoices and receipts 750 a quarter; Bank transactions Ledger 3,000 a quarter; Supplier payments 3 a
Ultra	£119 a month + VAT Includes: 1,500 invoices · 6,000 transactions
Ultra ×2	£229 Includes: 3,000 invoices · 12,000 transactions
Ultra ×4	£449 Includes: 6,000 invoices · 24,000 transactions
Ultra ×8	£879 Includes: 12,000 invoices · 48,000 transactions

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Briefcase Plans Pricing

7 plans

PLANS

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Briefcase Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: briefcase
name: Briefcase
description: 'Briefcase is an AI-native accounting and bookkeeping automation platform for UK accounting firms and businesses.
  Founded in 2024 in London by Reuben Steenkamp and Ján Stehlík, and backed by Earlybird Venture Capital, Entrepreneur First
  and Tiny, Briefcase describes itself as building the world''s first AI autopilot for accounting firms. The product uses
  multimodal AI and agentic workflows to automate the most tedious parts of accounting: extracting data from invoices, receipts
  and bank statements, categorising transactions against a firm''s chart of accounts, handling VAT (with embedded HMRC legislation
  for standard, reverse-charge and zero-rated VAT), automating prepayments and expense claims, and driving month-end and financial
  close. It publishes results into Xero and QuickBooks. Briefcase is delivered as a cloud SaaS application (app.briefcase.so);
  it is a consumer of accounting APIs rather than a public API producer, and at the time of this profile it publishes no developer/API
  documentation, OpenAPI, or SDKs.'
url: https://raw.githubusercontent.com/api-evangelist/briefcase/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- earlybird
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
image: https://briefcase.so/briefcase.png
tags:
- Company
- Accounting
- Bookkeeping
- Fintech
- Artificial Intelligence
- Automation
- VAT Compliance
- AI Agents
- Software-as-a-Service
- United Kingdom
tags_raw:
- Company
- Accounting
- Bookkeeping
- Fintech
- Artificial Intelligence
- Automation
- VAT Compliance
- Agentic AI
- SaaS
- United Kingdom
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/briefcase-plans-pricing.yml
- type: DomainSecurity
  url: security/briefcase-domain-security.yml
- type: Website
  url: https://briefcase.so/
- type: Pricing
  url: https://briefcase.so/pricing
- type: Blog
  url: https://briefcase.so/blog
- type: ChangeLog
  url: https://briefcase.so/changelog
- type: Support
  url: https://briefcase.so/help
- type: SignUp
  url: https://app.briefcase.so/
- type: TermsOfService
  url: https://briefcase.so/terms-of-service
- type: PrivacyPolicy
  url: https://briefcase.so/privacy-policy
- type: LLMsTxt
  url: llms/briefcase-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Briefcase API — frequently asked questions

How much does the Briefcase API cost?

Briefcase publishes its prices; its Low plan is £19 a month + VAT as of 2026-10-07. APIs.io lists 7 pricing plans for Briefcase, with each plan's price, limits and inclusions under Pricing on this page.

Is the Briefcase API ready for AI agents?

Briefcase has a Kin Score of 21.3 out of 100 (emerging) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-06.

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