What are the best Account and Transaction API Specification - UK alternatives? (2026)

Stock and Forex Data and Realtime Quotes

Validate VAT numbers and calculate VAT rates

This API is used for the classic integration. If you are just starting your implementation, refer to our [new integration guide](https://docs.adyen.com/marketplaces-and-platforms) instead. The Acc...

A flexible API for pulling accounting data, normalized and aggregated from 20 accounting integrations. Standardize how you connect to your customers’ accounting software. View, create, update, and...

A flexible API for pulling accounting data, normalized and aggregated from 20 accounting integrations. Standardize how you connect to your customers’ accounting software. View, create, update, and...

An API for accessing the NaviPlan Fact Finder.

The Balance Control API lets you transfer funds between merchant accounts that belong to the same legal entity and are under the same company account. ## Authentication To connect to the Balance C...

The BIN Lookup API provides endpoints for retrieving information, such as cost estimates, and 3D Secure supported version based on a given BIN. ## Authentication You need an [API credential](https...

Adyen Checkout API provides a simple and flexible way to initiate and authorise online payments. You can use the same integration for payments made with cards (including 3D Secure), mobile wallets,...

A web service containing utility functions available for merchants integrating with Checkout APIs. ## Authentication Each request to the Checkout Utility API must be signed with an API key. For thi...

Adyen Data Protection API provides a way for you to process [Subject Erasure Requests](https://gdpr-info.eu/art-17-gdpr/) as mandated in GDPR. Use our API to submit a request to delete shopper's d...

A set of API endpoints that allow you to initiate, settle, and modify payments on the Adyen payments platform. You can use the API to accept card payments (including One-Click and 3D Secure), bank ...

A set of API endpoints that allow you to store payout details, confirm, or decline a payout. For more information, refer to [Online payouts](https://docs.adyen.com/online-payments/online-payouts)....

The Recurring APIs allow you to manage and remove your tokens or saved payment details. Tokens should be created with validation during a payment request. For more information, refer to our [Token...

A set of API endpoints to manage stored value products.

The Test Cards API provides endpoints for generating custom test card numbers. For more information, refer to [Custom test cards](https://docs.adyen.com/development-resources/testing/create-test-ca...

La estandarización de la conexión con cualquier banco en tiempo real.

# Overview To facilitate management, Apache Airflow supports a range of REST API endpoints across its objects. This section provides an overview of the API design, methods, and supported use cases...

# Overview To facilitate management, Apache Airflow supports a range of REST API endpoints across its objects. This section provides an overview of the API design, methods, and supported use cases...

Insider trading data, earnings call analysis, financial statements, and more

Alibaba's payment platform — payments, mini programs, marketing tools, credit scoring (Zhima). Java, PHP, Node SDKs

Realtime and historical market data on all US equities and ETFs

Realtime and historical stock data

This API provides a range of functions to get back currency conversion rates and amounts based on current Mastercard currency conversion values.

# Introduction Welcome to the reference for the Zuora Billing REST API! To learn about the common use cases of Zuora Billing REST APIs, check out the [API Guides](https://www.zuora.com/develope...

[](https://app.getpostman.com/run-collection/80638214aa04722c9203) <span style='margin-left: 0.5em;'>or</span> <a href='https://documenter.getpos...

Codat's Assess API enable you to make smarter credit decisions on your small business customers. Assess enriches your customer's accounting, commerce and banking data to surface actionable insights...

API provided by hsbc.com

All Banco do Brasil financial transaction APIs

Instant IBAN and SWIFT number validation across the globe

Bank Feeds API enables your SMB users to set up bank feeds from accounts in your application to supported accounting platforms. A bank feed is a connection between a source bank account—in your ap...

Codat's Banking API allows you to access standardised data from over bank accounts via third party providers. Standardize how you connect to your customers’ bank accounts. Retrieve bank account an...

https://www.beanstream.com/api/v1

<div style='line-height: 30px;'> <strong>Welcome to the Big Red Cloud API</strong><br/> This API enables programmatic access to Big Red Cloud data.<br/> We have used Swagger to aut...

The Bill Payment Validator service allows RPPS origination (payment sender) customers to identify if a potential RPPS transaction would process successfully before transmitting the formal payment t...

This is a Billingo API v3 documentation. Our API based on REST software architectural style. API has resource-oriented URLs, accepts JSON-encoded request bodies and returns JSON-encoded responses. ...

Payment platform

BIN lookup API, the free api service from bintable.com to lookup card information using it's BIN. the service maintains updated database based on the comunity and other third party services to make...

Public access to a database of IIN/BIN information

A api to generate boletos in Brazil

See strong buy and sell signals the day they occur. Get today's stocks that closed with a strong Bullish or Bearish candlestick.

***UPDATE:*** *We have released a [beta version of the new bunq API documentation.](https://beta.doc.bunq.com)* ***NOTICE:*** *We have updated the sandbox base url to `https://public-api.sandbox....

# Introduction The Business Registries API is built on HTTP. The API is RESTful. It has predictable resource URIs. The API is documented in <a target="_blank" href="https://github.com/OAI/OpenAP...

# Chaingateway.io REST API to build the bridge between Ethereum and the real world Please check out our [website](https://chaingateway.io?utm_source=postman) for detailed information about this A...

>ℹ️ Check the new [Checkout onboarding guide](https://developers.vtex.com/vtex-rest-api/docs/checkout-overview). We created this guide to improve the onboarding experience for developers at VTEX. I...

## Important An **[API key](https://chompthis.com/api/)** is required for access to this API. Get yours at **[https://chompthis.com/api](https://chompthis.com/api/)**. ### Getting Started * **[S...

All Citigroup account and statement data APIs

This API is used for the classic integration. If you are just starting your implementation, refer to our [new integration guide](https://docs.adyen.com/marketplaces-and-platforms) instead. The Not...

The API for Sync for Expenses. Sync for Expenses is an API and a set of supporting tools. It has been built to enable corporate card and expense management platforms to provide high-quality integra...

Use the Ticketmaster Commerce API to look up available offers and products on various Ticketmaster platforms for North America markets. For formal partnerships and relationships, selected offers an...

Codat's Commerce API allows you to access standardised data from over 11 commerce and POS systems. Standardize how you connect to your customers’ payment, PoS, and eCommerce systems. Retrieve orde...

The Configuration API enables you to create a platform where you can onboard your users as account holders and create balance accounts, cards, and business accounts. ## Authentication Your Adyen c...

Adyen sends notifications through webhooks to inform your system about events that occur in your platform. These events include, for example, when an account holder's capabilities are updated, or w...

# Overview The ContentGroove Developer API enables you to add the power of ContentGroove's video AI to your own applications and workflows. Webhooks are a way for ContentGroove to send video info...

<p style="text-align: justify;">You can use the CORE API to access the resources harvested and enriched by CORE. If you encounter any problems with the API, please <a href="/contact">report th...

Real-time exchange rates for Latin American currencies

Complete API for online store operations including product catalog, shopping cart, checkout, and user management.

SEC filings, insider transactions, institutional holdings

This API is used to retrieve seller payouts and monetary transaction details related to those payouts.

Global macroeconomic data

Pension Payment Order and UAN, as provided by EPFO (https://www.epfindia.gov.in), can be downloaded in citizen's DigiLocker account.

API provided by tokenmetrics.com

The Unified Taxonomic Information Service (UTIS) is the taxonomic backbone for the EU-BON project

Fetch the latest currency exchange rates via API. ExchangeRate-API is free and unlimited.

U.S. Department of the Treasury Data

Finage is a stock, currency, cryptocurrency, indices, and ETFs real-time & historical data provider

Stock market and financial data

Realtime and historical stock data

Real-Time RESTful APIs and Websocket for Stocks, Currencies, and Crypto

The fire.com API allows you to deeply integrate Business Account features into your application or back-office systems. The API provides read access to your profile, accounts and transactions, eve...

Online payment fraud detection service. It helps merchants to minimize chargebacks and therefore maximize the revenue. It can be used to detect fraud for various kinds of payment method, such as cr...

Send an SMS with verification code and a custom message for authentication purpose. It helps merchants to minimize chargebacks and fraud for various kinds of payment method, such as credit card, pa...

Economic data from the Federal Reserve Bank of St. Louis

Front accounting is multilingual and multicurrency software for small businesses

This API is used for the classic integration. If you are just starting your implementation, refer to our [new integration guide](https://docs.adyen.com/marketplaces-and-platforms) instead. The Fun...

Real-time forex macroeconomic API for all major currency pairs sourced from central bank announcements

>ℹ️ Onboarding guide > > Check the new [Payments onboarding guide](https://developers.vtex.com/docs/guides/payments-overview). We created this guide to improve the onboarding experience for devel...

>ℹ️ Check the new [Payments onboarding guide](https://developers.vtex.com/vtex-rest-api/docs/payments-overview). We created this guide to improve the onboarding experience for developers at VTEX. I...

GOV.UK Pay API (This version is no longer maintained. See openapi/publicapi_spec.json for latest API specification)

This API is used for the classic integration. If you are just starting your implementation, refer to our [new integration guide](https://docs.adyen.com/marketplaces-and-platforms) instead. The Hos...

Stock market data powered by SQL

IBANAPI OpenApi documentation

Interactive Brokers Web API for 3rd Party Companies

Realtime & Historical Stock and Market Data

Spreadbetting and CFD Market Data

IIN API allows you to accurately identify the issuing bank, card type, country of origin, and other details from a credit or debit card number. This is essential for fraud prevention, payment processing, and customer verification.

Income Tax Department, Govt of India has provided PAN Verification Records to Indian citizens via DigiLocker. You can verify the correctness of your PAN data in real-time using this facility.

Get complete history of India Mutual Funds Data

A wide selection of financial data feeds

Jharkhand e-District is a comprehensive and web enabled service portal that acts as an electronic gateway into the Government's portfolio of services. Jharsewa provides Certificates like Birth, De...

Stock market investment and trading platform

Klarna payment and shopping service

API Interface to retrieve company data and products from business registers

The Legal Entity Management API enables you to manage legal entities that contain information required for verification. ## Authentication To connect to the Legal Entity Management API, you must u...

Cross-border payment platform — international settlements, merchant services, e-wallet. REST API

The Locations API provides access to MasterCard's ATM and Merchant location database

Configure and manage your Adyen company and merchant accounts, stores, and payment terminals. ## Authentication Each request to the Management API must be signed with an API key. [Generate your API...

Adyen uses webhooks to inform your system about events that happen with your Adyen company and merchant accounts, stores, payment terminals, and payment methods when using [Management API](https://...

Real-Time, Intraday & Historical Market Data API

Mastercard ABU API

MasterCard Bin Table Listing API

Helps acquirers identify potentially high-risk merchants before entering to a merchant agreement.

This API provides our Issuer partners with resources to help resolve consumer queries about payment accounts enabled through our digitization platform.

Mercado Pago API reference - all the information you need to develop your integrations

eSubscription Voucher for LPG connections provided by HPCL (http://www.hindustanpetroleum.com/) are made available to citizens in their DigiLocker accounts.

eSubscription Voucher for LPG connections provided by IOCL (https://www.iocl.com/) are made available to citizens in their DigiLocker accounts.

eSubscription Voucher for LPG connections provided by BPCL (https://bharatpetroleum.com/) are made available to citizens in their DigiLocker accounts.

Connect with users’ bank accounts and access transaction data in Africa

The Moov API makes it simple for platforms to send, receive, and store money

NamSor API v2 : enpoints to process personal names (gender, cultural origin or ethnicity) in all alphabets or languages. By default, enpoints use 1 unit per name (ex. Gender), but Ethnicity classif...

An API for accessing NaviPlan plan data for a client.

[nFusion Solutions](https://nfusionsolutions.com) provides [REST APIs](https://nfusionsolutions.com/data-feeds/) that deliver enterprise-grade financial data. Data sets include real-time and histor...

Connect to bank accounts using official bank APIs and get raw transaction data

This API is used for the classic integration. If you are just starting your implementation, refer to our [new integration guide](https://docs.adyen.com/marketplaces-and-platforms) instead. The Not...

NOWPayments is a non-custodial cryptocurrency payment processing platform. Accept payments in a wide range of cryptos and get them instantly converted into a coin of your choice and sent to your wa...

Ntropy Transaction API for transaction classification & management Contact Support: Name: API Support Email: api@ntropy.network

Latest Swagger specification for OpenData

Equity, index, futures, options symbology from Bloomberg LP

# Introduction [OpenFinTech.io](https://openfintech.io) is an open database that comprises of standardized primary data for FinTech industry.<br> It contains such information as geolocation data (c...

Globalize your business by auto-adapting pricing for each visitor with Purchasing Power Parity

For general questions and support of the API, contact: webservices@paylocity.com # Overview Paylocity Web Services API is an externally facing RESTful Internet protocol. The Paylocity API uses ...

The Payment Account Reference Inquiry API is the unified Mastercard interface for allowing Mastercard Customers involved in payment card acceptance -- whether Merchants, Acquirers, or Digital Activ...

The payment webhooks are deprecated. Use the [accounting webhooks](https://docs.adyen.com/api-explorer/transfer-webhooks/latest/overview) instead. Adyen sends notifications through webhooks to inf...

>ℹ️ Onboarding guide > > Check the new [Payments onboarding guide](https://developers.vtex.com/docs/guides/payments-overview). We created this guide to improve the onboarding experience for devel...

API provided by pay1.de

This API provides content for financial instutions participating in Mastercard Personalized Offers to use in online and mobile banking applications for cardholders.

Chinese payment aggregator — unifies Alipay, WeChat Pay, UnionPay, Apple Pay into one API. 7 language SDKs

Connect with user's bank accounts and access transaction data

The PocketSmith API

Historical stock market data

Portfolio analysis and optimization

This API provides endpoints for managing your point-of-sale (POS) payment terminals. You can use the API to obtain information about a specific terminal, retrieve overviews of your terminals and st...

> Check the new [Promotions onboarding guide](https://developers.vtex.com/vtex-rest-api/docs/promotions-overview). We created this guide to improve the onboarding experience for developers at VTE...

Indian Financial Systems Code (Bank Branch Codes)

Websocket API to access realtime stock data

Realie's property data is directly sourced from local municipalities and contains over 100 data fields. Realie covers the entire USA with 180 million parcels.

# Introduction The Rebilly API is built on HTTP. Our API is RESTful. It has predictable resource URLs. It returns HTTP response codes to indicate errors. It also accepts and returns JSON in the...

API provided by linuxfoundation.org

Retrieve real-time property and rental data for real estate in the United States

Adyen sends notifications through webhooks to inform your system that reports were generated and are ready to be downloaded. You can download reports programmatically by making an HTTP GET request...

API provided by mastercard.com

API to access annual reports of public US companies

API provided by mastercard.com

Shotstack is a video, image and audio editing service that allows for the automated generation of videos, images and audio using JSON and a RESTful API. You arrange and configure an edit and POST ...

Sinao API for account management, apps administration and network exploration

Gain access to set of <SmartAPI> and create end-to-end broking services

Currency Authority: Exchange Rate of 1453 country currencies and crypto currencies

This is an API designed for merchants who are using SpectroCoin services and wishes to integrate them locally.

This API will provide monthly data which includes metrics such as sales volume and growth rate.

Client library for accessing the Square Connect APIs

Real-Time, Intraday & Historical Market Data, News and Sentiment API

Storecove API

Payment processing, subscriptions, and financial management

The Stripe REST API. Please see https://stripe.com/docs/api for more details.

Realtime and historical stock data and current stock sentiment

API provided by vtex.local

# Summary The **Swiss NextGen API** is based on the NextGenPSD2 *Framework Version 1.3.4* of the Berlin Group which offers a modern, open, harmonised and interoperable set of Application Programmin...

The API for Sync for Commerce. Sync for Commerce is an API and a set of supporting tools. It has been built to enable e-commerce, point of sale platforms to provide high-quality integrations with n...

Instant VAT number and tax validation across the globe

Taxamo’s elegant suite of APIs and comprehensive reporting dashboard enables digital merchants to easily comply with EU regulatory requirements on tax calculation, evidence collection, tax return c...

<h3>Introduction</h3> <p>Taxrates.io is a global tax rate service that automates the management of monitoring tax rates changes in 181 countries. We monitor over 14,000 US sales tax, VAT, GST rates...

Learn more about home mortgage data, download the data yourself, or build new tools using our API.

Please see usage policies on tokenjay.app

Chinese financial data API — stock market, fund, macro-economic data with free trial

### Overview Tradematic Cloud is a trading infrastructure for building investment services. It’s a trading engine + API + ready-made adapters to stock and forex brokers, crypto exchanges, and mark...

Real time financial market data

US equity/option market data (delayed, intraday, historical)

Adyen sends notifications through webhooks to inform your system about incoming and outgoing transfers in your platform. You can use these webhooks to build your implementation. For example, you c...

The Transfers API provides endpoints that you can use to get information about all your transactions, move funds within your balance platform or send funds from your balance platform to a [transfer...

Stock market data (real-time & historical)

China's national card network — online payments, QR code payments, tokenization. Java, .NET, PHP SDKs

This API lets you quickly validate IBAN bank codes

Validates BIC/SWIFT code

A developer friendly API to help your business achieve VAT compliance

A unified POS system for small businesses including restaurants, beauty salons, and retail. Supports order management, reservations, payments, inventory, and customer loyalty.

WallstreetBets Stock Comments Sentiment Analysis

Tencent's mobile payment API — QR code, in-app, H5, mini program payments. v3 API with full REST + SDKs

The Word Associations Network API allows developers to embed the ability to find associations for a word or phrase into their mobile apps or web services. Words are grouped by semantics, meaning, a...

Exchange rates & real time market data

API provided by xero.com

The Assets API exposes fixed asset related functions of the Xero Accounting application and can be used for a variety of purposes such as creating assets, retrieving asset valuations etc.

The Bank Feeds API is a closed API that is only available to financial institutions that have an established financial services partnership with Xero. If you're an existing financial services partn...

These endpoints are specific to Xero Files API

These endpoints are related to managing authentication tokens and identity for Xero API

This is the Xero Payroll API for orgs in Australia region.

Real time low latency Yahoo Finance API for stock market, crypto currencies, and currency exchange

Chinese online payment platform — B2B, B2C payments, fund settlement, risk management

Budgeting & Planning

Our API uses a REST based design, leverages the JSON data format, and relies upon HTTPS for transport. We respond with meaningful HTTP response codes and if an error occurs, we include error detail...

This file describes the Yodlee Platform APIs using the swagger notation. You can use this swagger file to generate client side SDKs to the Yodlee Platform APIs for many different programming langua...

Online accounting software, built for your business