Find the right API.
Use search when the broad directory stops being enough. Filter by category, auth, CORS, signup friction, and result freshness until the shortlist becomes obvious.
Start with category and auth when you know the integration shape. Use free, signup, and CORS flags when you are trying to remove setup friction.
Sort by verification or response time when the final call is about reliability, not just category fit.
351 results in the full search view. Start narrowing from the rail when the field is still too broad.
1Forge Finance APIs
1Forge Finance API provides real-time stock / forex / crypto quotes — targeting traders and financial app developers.
AbuseIPDB
IP/domain/URL reputation
Access Analyzer
AWS IAM Access Analyzer API analyzes IAM resource policies for over-privileged access or external access — proactively surfaces security risks.
Account and Transaction API Specification
UK Open Banking Account Information API (AIS) lets authenticated third parties read user bank account balance, transactions, and metadata with user consent.
Account API
Configure eBay seller account policies, payments program settings, KYC data, and related account resources.
Admin SDK API
Google Workspace Admin SDK API programmatically manages Workspace organizations — users, groups, devices, domains, audit logs, organizational units.
AdMob API
Retrieve AdMob accounts, apps, ad units, ad sources, and generate mediation or network reports.
Adobe Experience Manager (AEM) API
Adobe Experience Manager (AEM) Sites API programmatically manages site content — pages, components, digital assets, workflows.
AdoptAPet
Resource to help get pets adopted.
AdSense Host API
Work with AdSense Host accounts, ad clients, ad units, reports, and ad code generation from one API surface.
Adyen Balance Control API
Adyen Balance Control API moves funds between merchant accounts within Adyen — for centralized fund management and reconciliation.
Adyen BinLookup API
Adyen BIN Lookup API returns card info from the first 6-8 digits of a PAN (BIN) — issuing bank, country, card type (debit/credit), product type.
Adyen Checkout API
Adyen Checkout API is the modern payments API for new integrations — pairs with frontend drop-in components, auto-adapting to 250+ payment methods.
Adyen Checkout Utility Service
Adyen Checkout Utility API provides auxiliary operations for Checkout API — originKey generation, payment methods listing, status queries.
Adyen Data Protection API
Adyen Data Protection API handles GDPR/privacy operations — right-to-be-forgotten, PII deletion, shopper data export.
Adyen Payment API
Adyen Payments API is its flagship payment-processing API — authorize, capture, and refund across cards, local payment methods, and wallets.
Adyen Payout API
Adyen Payouts API moves funds from a merchant account out to external bank accounts or cards — supports multiple local clearing rails.
Adyen Recurring API
Adyen Recurring API manages subscription card tokens — store, look up, and reuse tokens for subsequent card-not-present payments.
Adyen Test Cards API
Adyen Test Card Service API generates test card numbers for sandbox payment testing — covers various issuer response scenarios.
Airtable API
Airtable API lets you use Airtable databases (spreadsheet-like collaborative DB) as backends — read/write records, fields, views; favorite of no-code teams.
Alchemy API
Alchemy is a Web3 dev platform — Ethereum/Polygon/Arbitrum/Optimism/Solana node access + enhanced APIs (NFT, Token, Transfer, etc.).
AlienVault Open Threat Exchange (OTX)
IP/domain/URL reputation
Amazon Chime
Amazon Chime SDK API embeds real-time audio/video calling and chat into apps (meetings, messaging, PSTN calls).
Amazon CloudFront
Amazon CloudFront is the AWS CDN and edge service — accelerates static and dynamic content delivery, a standard for web performance.