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FintechToolkit

The AI- and developer-first directory of fintech infrastructure tools. Curated APIs, data sources, and open-source projects for builders shipping payments, banking, and beyond.

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  • Payments & Billing
  • Open Banking
  • Identity & KYC
  • Market Data

© 2026 FintechToolkit. The toolkit for fintech builders.

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Usage-based

23 tools

Tools with this pricing

Stripe logo

Stripe

Featured

Full-stack payments platform for accepting payments, managing subscriptions, and running marketplaces.

Payments & Billing
API, SDKGlobalUsage-based
Alloy logo

Alloy

Identity decisioning for KYC, KYB, and ongoing monitoring across 270+ data sources.

Identity & KYC
API, PlatformGlobalUsage-based
Tink logo

Tink

PSD2-compliant open banking for account aggregation, payment initiation, and finance data.

Banking & Open Finance
API, SDKEuropeUsage-based
Onfido (part of Entrust) logo

Onfido (part of Entrust)

AI-powered identity verification and biometric authentication for global onboarding and KYC.

Identity & KYC
API, SDKGlobalUsage-based
Unit logo

Unit

Embedded finance platform for adding banking, cards, and lending to any product.

Banking & Open Finance
API, PlatformUSUsage-based
Adyen logo

Adyen

Featured

Single global platform for card acquiring, local payment methods, and unified commerce.

Payments & Billing
API, PlatformGlobalUsage-based
Checkout.com logo

Checkout.com

Enterprise payment processing with direct acquiring and granular authorisation control.

Payments & Billing
APIGlobalUsage-based
Paddle logo

Paddle

Merchant of record for software companies — billing, sales tax, and compliance handled.

Payments & Billing
API, PlatformGlobalUsage-based
Lemon Squeezy logo

Lemon Squeezy

Merchant of record for digital products, with checkout, subscriptions, and tax handled.

Payments & Billing
APIGlobalUsage-based
Mollie logo

Mollie

European payments provider with local methods and a deliberately simple integration.

Payments & Billing
API, SDKEuropeUsage-based
Razorpay logo

Razorpay

Full-stack payments and business banking for the Indian market.

Payments & Billing
API, SDKIndiaUsage-based
Airwallex logo

Airwallex

Global accounts, FX, and payouts for businesses operating across multiple currencies.

Payments & Billing
API, PlatformGlobalUsage-based
TrueLayer logo

TrueLayer

Open banking payments and data across the UK and Europe, built on PSD2 rails.

Banking & Open Finance
APIEurope, UKUsage-based
GoCardless logo

GoCardless

Bank debit and open banking payments for recurring and invoice collection.

Banking & Open Finance
APIGlobalUsage-based
Yapily logo

Yapily

Open banking infrastructure with no end-user interface — a pure API layer.

Banking & Open Finance
APIEurope, UKUsage-based
Increase logo

Increase

Banking primitives — accounts, ACH, wires, and cards — exposed as a direct API.

Banking & Open Finance
APIUSUsage-based
Column logo

Column

A nationally chartered bank with its own developer API, no intermediary.

Banking & Open Finance
APIUSUsage-based
Persona logo

Persona

Configurable identity verification and KYB workflows for individuals and businesses.

Identity & KYC
API, PlatformGlobalUsage-based
Veriff logo

Veriff

AI-driven document and biometric verification with broad document coverage.

Identity & KYC
API, SDKGlobalUsage-based
Sumsub logo

Sumsub

Full verification stack — KYC, KYB, AML screening, and transaction monitoring.

Identity & KYC
API, PlatformGlobalUsage-based
SEON logo

SEON

Fraud prevention built on digital footprint analysis from email, phone, and IP.

Fraud, Risk & AML
APIGlobalUsage-based
Tradier logo

Tradier

Brokerage and market data APIs for building trading applications.

Investing & Wealth
APIUSUsage-based
Moov logo

Moov

Open Source

Payments platform with a large set of open-source Go libraries for ACH and wires.

Developer InfrastructurePayments & Billing
API, OSSUSUsage-based