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What is the Fiet Business API?

Discover markets, get live quotes, then obtain and execute on token swap or fiat payment instructions. Designed for fintechs and businesses integrating moving global currencies.
The Fiet Business API is not yet publicly released. Expect initial availability in Q2 2026.
API design and documentation are subject to change.
The Fiet Business API gives businesses and fintechs a single hosted API surface for:
  • Discovering supported markets (chains, tokens, corridors)
  • Fetching live derived quotes from current on-chain state
  • Generating swap instructions (calldata + constraints) for you to execute
  • Producing multi-step payment plans for cross-border and off-ramp workflows
  • Sending Digital Collect requests where recipients complete a short, Fiet-hosted collection flow
The Business API is non-custodial infrastructure:
  • It does not sign transactions
  • It does not broadcast transactions
  • It has no access to your keys or customer funds

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What you can build

Market discovery

Populate chain/token selectors and validate corridors before quoting or payments.

Live quotes

Request derived pricing for swaps using EXACT_IN or EXACT_OUT semantics.

Stablecoin or Token swaps

Get calldata and constraints as ordered instructions for client-side execution.

Cross-border payments

Orchestrate deposit, swap, and payout steps with stable references for reconciliation.

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Architecture at a glance

Fiet provides the planning (quotes, instructions, plans). You control execution (signing and broadcasting), either with your own wallet infrastructure or via the Client Node (coming soon). For the full workflow diagrams (including Digital Collect recipient experience), see the Architecture page:

Architecture

Understand the end-to-end experience for swaps, payments, and Digital Collect.

Authentication

How to authenticate requests and handle common errors.

Core concepts

Quotes, instructions, corridors, plans, and step lifecycles.

Your first quote

Make a derived quote request and interpret the response.