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Finno: finance and innovation for the API economy

Watch the platform overview — how Finno combines proxy, authorization, metering, and double-entry accounting so every unit of digital consumption becomes auditable revenue.

By Finno Team

  • video
  • overview
  • revenue-infrastructure
  • product
Finno platform overview video — financial infrastructure for the API economy.

Finno is financial infrastructure for the API economy — not another routing layer with billing bolted on later. The overview below walks through how the platform closes the billing gap, enforces real-time spend authorization, and posts every charge to a double-entry ledger before the HTTP response returns.

What the video covers

Revenue infrastructure, not just a gateway

Most stacks split proxy, metering, payments, and ledger into separate systems. That architecture creates a billing gap — a window where usage is delivered but revenue is not yet accountable. Finno treats proxy and ledger as one replicated state machine on the request path.

Meter → Authorize → Charge → Account

The core loop runs inside every API call:

  1. Meter — measure bytes, tokens, calls, or custom units from request and response.
  2. Authorize — reserve funds (quota, wallet, or credit) before upstream runs; return 402 when funding is insufficient.
  3. Charge — finalize the actual cost after the response; refund any over-reservation atomically.
  4. Account — post to six double-entry accounts (Float, Receivable, Wallet, Owed, Deferred Revenue, Revenue) with an invariant checked after every command.

Built for teams that monetize APIs

The overview shows how Finno serves AI platforms, SaaS with metered tiers, data marketplaces, and fintech APIs — anywhere margin and auditability matter as much as throughput.

Self-hosted and production-ready

Finno is written in Rust, replicated with Raft, and designed for on-prem, private cloud, and air-gapped deployments. Financial controls add sub-millisecond overhead on the hot path — so revenue assurance does not trade off against latency.

Who should watch

  • CEOs and CFOs evaluating revenue leakage and reconciliation risk in API businesses
  • Revenue Operations teams comparing split gateway + billing stacks to an integrated model
  • Platform engineers who need to understand how Reserve/Finalize billing works in practice

Want a deeper dive? Read Beyond API gateway: why Finno is revenue infrastructure, explore how it works, or contact the team.