# Firstbase

**Canonical:** https://apis.io/providers/firstbase/  
**Website:** https://www.firstbase.io/  
**APIs profiled:** 0

Firstbase is an all-in-one startup operating system that helps founders form, run, and grow a US business from anywhere in the world. Its products cover incorporation (Firstbase Start for LLCs and C-Corps in Delaware, Wyoming, New York, Texas and more), ongoing compliance and registered-agent services (Firstbase Agent), bookkeeping, invoicing and tax-ready financials (Firstbase Accounting), tax filing, and a virtual business address (Firstbase Mailroom). Firstbase markets an embedded "Incorporation API" for platforms that want to offer company formation to their own users, but publishes no public developer documentation, OpenAPI specification, or self-serve developer portal for it. Firstbase is a venture-backed company (a16z portfolio) added to the API Evangelist network and enriched from its public web surface.

## Kin Score — 20.5 / 100 (emerging)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 20.5).

| Facet | Score |
|---|---|
| Discoverability | 57.4 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 15.8 |
| Developer Ergonomics | 19.0 |
| Commercial Clarity | 44.7 |
| Access Clarity | 44.7 |

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| 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 |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Security (1)

- **Firstbase Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC

## Tags

Company, Incorporation, Company Formation, Compliance, Accounting, Bookkeeping, Taxes, Registered Agent, Startups, Fintech

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