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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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NewExplore the latest fintech APIs and data sources

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.

Popular:Payments & BillingBanking & Open FinanceFraud, Risk & AMLIdentity & KYCFinancial Data & Market DataDeveloper InfrastructureInvesting & Wealth

7 categoriesacross payments, banking, lending, wealth & more

Showing 14 tools

St

Stripe

Featured

Full-stack payments platform with APIs for accepting payments, managing subscriptions, and running a marketplace.

Payments & Billing
API, SDKGlobalUsage-based
Pl

Plaid

Connect bank accounts and access financial data — transactions, balances, identity — via a unified open banking API.

Banking & Open Finance
APIUS, UK, EuropeFree tier
Sa

Sardine

Real-time fraud and compliance platform with device intelligence, behavioral biometrics, and AML screening.

Fraud, Risk & AML
API, PlatformGlobalEnterprise
Al

Alloy

Identity decisioning platform for KYC, KYB, and ongoing monitoring. Orchestrate 190+ data sources.

Identity & KYC
API, PlatformGlobalUsage-based
Po

Polygon.io

Real-time and historical market data API for stocks, options, forex, and crypto with low-latency websocket feeds.

Financial Data & Market Data
APIGlobalFree tier
Op

OpenFinTech.io

Open Source

Open-source catalog of fintech providers, payment systems, and banking institutions with structured metadata.

Developer Infrastructure
Dataset, OSSGlobalFree
Ti

Tink

PSD2-compliant open banking platform enabling account aggregation, payment initiation, and personal finance data.

Banking & Open Finance
API, SDKEuropeUsage-based
On

Onfido

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

Identity & KYC
API, SDKGlobalUsage-based
Mi

Mifos X

Open Source

Open-source core banking platform for microfinance and community finance, with a REST API and mobile clients.

Banking & Open Finance
Platform, OSSGlobalFree
Br

Brex

Spend management and corporate cards API for startups and growing businesses.

Payments & Billing
APIUSEnterprise
Al

Alpaca

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

Investing & Wealth
APIGlobalFree tier
Un

Unit

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

Banking & Open Finance
API, PlatformUSUsage-based
Op

Open Exchange Rates

Reliable, accurate, and up-to-date currency data and exchange rates API.

Financial Data & Market Data
APIGlobalFree tier
Co

ComplyAdvantage

AI-driven AML and sanctions screening with real-time risk intelligence.

Fraud, Risk & AML
API, PlatformGlobalEnterprise

Browse by Category

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Payments & Billing

2 tools

Banking & Open Finance

4 tools

Fraud, Risk & AML

2 tools

Identity & KYC

2 tools

Financial Data & Market Data

2 tools

Developer Infrastructure

1 tool

Investing & Wealth

1 tool