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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

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The Toolkit for Fintech Builders

Discover APIs, data sources, open data, and open-source projects that power payments, banking, lending, wealth, KYC, AML, and compliance infrastructure — curated for developers and AI agents.

Browse:Payments & BillingBanking & Open FinanceFraud, Risk & AMLIdentity & KYCFinancial Data & Market DataDeveloper InfrastructureInvesting & Wealth
  • Stripe logo
  • Plaid logo
  • Sardine logo
  • Alloy logo
  • Massive (formerly Polygon.io) logo
  • OpenFinTech.io logo
  • Tink logo
  • Onfido (part of Entrust) logo
  • Apache Fineract (Mifos X) logo
  • Brex logo
  • Alpaca logo
  • Unit logo

7 categories across payments, banking, lending, wealth & more

Start with what you are building

Turn an implementation goal into a focused research path, then validate the providers against your market, stack, and operational requirements.

Accept payments

Explore payment processing, subscriptions, merchant-of-record, and marketplace infrastructure.

Explore path

Connect bank data

Research open-banking APIs, account aggregation, and embedded-finance providers.

Explore path

Verify customers

Compare KYC, KYB, identity verification, AML, and onboarding infrastructure.

Explore path

Build money movement

Find ledgers, payouts, accounts, and financial-developer infrastructure.

Explore path

Featured tools

All 47 tools
Adyen logo

Adyen

Featured

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

Payments & Billing
API, PlatformGlobalUsage-based
Stripe logo

Stripe

Featured

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

Payments & Billing
API, SDKGlobalUsage-based
Airwallex logo

Airwallex

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

Payments & Billing
API, PlatformGlobalUsage-based
Alloy logo

Alloy

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

Identity & KYC
API, PlatformGlobalUsage-based
Alpaca logo

Alpaca

Commission-free US stock and crypto trading API for building brokerage and wealth apps.

Investing & Wealth
APIUSFree tier
Alpha Vantage logo

Alpha Vantage

Free market data API covering equities, forex, crypto, and technical indicators.

Financial Data & Market Data
APIGlobalFree tier
Apache Fineract (Mifos X) logo

Apache Fineract (Mifos X)

Open Source

Open-source core banking engine for microfinance and community finance, with a full REST API.

Banking & Open Finance
Platform, OSSGlobalFree
Brex logo

Brex

Spend management and corporate cards API for venture-backed and enterprise companies.

Payments & Billing
APIUSEnterprise
Chainalysis logo

Chainalysis

Blockchain analytics for crypto AML, sanctions screening, and investigations.

Fraud, Risk & AML
API, PlatformGlobalEnterprise

Browse by category

View all categories

Payments & Billing

Processing, invoicing, subscriptions, and billing.

11 tools

Banking & Open Finance

Open banking, aggregation, and embedded finance.

11 tools

Fraud, Risk & AML

Fraud detection, AML, and sanctions screening.

6 tools

Identity & KYC

Verification, KYC/KYB, and biometric onboarding.

6 tools

Financial Data & Market Data

Market data, FX rates, and financial APIs.

8 tools

Developer Infrastructure

SDKs, datasets, and developer tooling.

4 tools

Investing & Wealth

Trading APIs, brokerage, and wealth platforms.

3 tools