Developer Docs | Functional Finance

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Build with Functional Finance

The financial execution OS for insurance, premium financing, and contract-based businesses. Full OpenAPI surface, hand-authored resource pages, AI assistant, and LLM-ready mirrors for Claude / Cursor / Replit / Codex.

Browse the live API Start with PaymentIntent

API operations

206

Endpoints live in the auto-rendered reference, synced weekly from ff-backend.

Hand-authored resources

41

Long-form pages with prose, examples, and code samples.

LLM-ready surfaces

4

openapi.json, llms.txt, llms-full.txt, plus markdown mirrors of every resource page.

News & Updates

What's live

API Reference

Hand-authored, long-form pages for the core resources. Click through to PaymentIntent, Customer, Refund, and the rest.

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Flows

Multi-step business-outcome flows that model real insurance operations end to end with runnable code and webhook delivery.

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AI Assistant

Ask anything in the drawer; the assistant cites the relevant docs page in every answer. Guide mode and scenario walkthroughs are in flight.

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LLM-first ingestion

openapi.json, llms.txt, llms-full.txt, and per-resource .md mirrors so Claude, Cursor, Replit, and Codex can ground without scraping HTML.

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SDKs

Runnable code samples for every operation in cURL, Python, and Node. Packaged Python and Node SDKs are in progress and ship in a coming release.

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LLM Context Files

Add either URL to your AI coding assistant as a permanent context source. Copy and paste into Cursor's .cursorrules, a Claude Project, or a ChatGPT custom instruction.

/llms.txtCurated index — Short, structured — ideal for Cursor rules and Claude Projects

/llms.txt

/llms-full.txtFull context bundle — Every API page concatenated — paste directly into any long-context session

/llms-full.txt