# Invoice Ninja

**Canonical:** https://apis.io/providers/invoice-ninja/  
**Website:** https://www.invoiceninja.com  
**APIs profiled:** 10

Invoice Ninja is an open-source invoicing, billing, payments, and expense tracking platform for freelancers and small businesses, available both as a self-hosted application and a managed SaaS at invoicing.co. The Invoice Ninja v5 REST API exposes full CRUD access to clients, invoices, quotes, payments, products, recurring invoices, expenses, projects, and tasks, authenticated with an API token (plus an optional secret) passed via HTTP headers.

## Kin Score — 28.6 / 100 (thin)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 28.6).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 53.6 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 23.8 |
| Commercial Clarity | 23.7 |
| Access Clarity | 23.7 |

Regulatory layer — **Payments**: 18.8 (matched via tags).

## Agent readiness — 17.3 (agent-aware)

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

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (10)

- **Invoice Ninja Activities API** — The Activities API from Invoice Ninja — 3 operation(s) for activities.
- **Invoice Ninja Authentication API** — The Authentication API from Invoice Ninja — 2 operation(s) for authentication.
- **Invoice Ninja Bank Integrations API** — The Bank Integrations API from Invoice Ninja — 3 operation(s) for bank integrations.
- **Invoice Ninja Bank Transaction Rules API** — The Bank Transaction Rules API from Invoice Ninja — 2 operation(s) for bank transaction rules.
- **Invoice Ninja Bank Transactions API** — The Bank Transactions API from Invoice Ninja — 3 operation(s) for bank transactions.
- **Invoice Ninja Charts API** — The Charts API from Invoice Ninja — 4 operation(s) for charts.
- **Invoice Ninja Client Gateway Tokens API** — The Client Gateway Tokens API from Invoice Ninja — 2 operation(s) for client gateway tokens.
- **Invoice Ninja Companies API** — The Companies API from Invoice Ninja — 4 operation(s) for companies.
- **Invoice Ninja Company Gateways API** — The Company Gateways API from Invoice Ninja — 2 operation(s) for company gateways.
- **Invoice Ninja Settings API** — The Settings API from Invoice Ninja — 1 operation(s) for settings.

## Agentic access (1)

- **Invoice Ninja Agentic Access** — 44 operations · 29 acting

## Security (2)

- **Invoice Ninja Authentication** — apiKey · 1 scheme
- **Invoice Ninja Domain Security** — TLSv1.3 · DMARC

## Tags

Invoicing, Billing, Payments, Accounting, Open-Source, Freelancers, SMB

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