REST API

Representational State Transfer.

Educational content only. This page does not provide investment, legal, or regulatory advice.

Why it matters

REST API matters because it affects financial interpretation, product decisions, and industry communication.

REST API is commonly explained through its core definition and the practical example used in the glossary.

A common mistake is to use REST API without understanding its operational and regulatory context.

REST API may vary across payment rails, regulations, and market practices.

Simulation of human intelligence by machines.

API

Application Programming Interface.

API Banking

Banking services provided via APIs.

BACS

Bankers Automated Clearing Services.

Big Data

Large, complex datasets.

Biometric Authentication

Verification using unique biological characteristics.

Open Banking UK

Open Banking UK: API standards

Primary source for open banking permissions and recurring payment rails.

European Banking Authority

European Banking Authority: Strong Customer Authentication

Primary source for SCA and PSD2 compliance context.

SWIFT

SWIFT: ISO 20022 migration

Primary source for ISO 20022 and messaging standards.

Author

Founder and multilingual fintech glossary editor

Reviewer

Editorial and source review layer

Reviewed

3/15/2026