API Directory

Scalable object storage for any type of data.

Open-source auth with row-level security tied to PostgreSQL.

Open-source Firebase alternative with PostgreSQL, auth, and storage.

Application error monitoring, performance tracking, and alerting.

Manage repos, issues, PRs, actions, and user data on GitHub.

Access GPT models for text generation, code, vision, and embeddings.

Access MongoDB data via HTTPS endpoints without drivers.

Access Claude models for reasoning, coding, and analysis.

Unified object storage with global edge caching.

Accept payments, manage subscriptions, invoices, and payouts globally.

Payments infrastructure for platforms and marketplaces.

Google sign-in and OAuth 2.0 authorisation for apps.

Run code without provisioning servers, triggered by events.

Build apps, bots, and workflows for Slack workspaces.

Google-backed auth for mobile and web with social login support.

NoSQL cloud database with real-time sync across clients.

Hosted search with typo tolerance, faceting, and instant results.

Massively scalable object storage for unstructured data.

Cross-platform push notifications for mobile and web.

Access Claude, Llama, and other foundation models on AWS.

Open-source integration platform. OAuth + data sync for 400+ APIs. One SDK, every integration.

250+ tools and integrations purpose-built for AI agents. Single SDK to connect GitHub, Slack, Gmail, Linear, Jira, and more.

Agent-native tool platform. Authenticated tools for AI agents with per-user OAuth handled by Arcade.

USDC issuance, custody, and payment rails. Circle Skills provide agent-native CLI and coding agent instructions. Nanopayments testnet targets sub-cent agent commerce.

HTTP 402 payment standard for agent-to-agent pay-per-call. MCP server, CLI, TS/Python SDKs. Becoming the de facto rail for metered agent APIs.

The first banking platform built for AI agents. MCP server, CLI tool, permissioned architecture with initiator-approver workflow. Opens business bank accounts, issues corporate cards, handles payments (ACH/wire/USDC) and invoicing.

Developer-first email API built for modern applications.

Programmable SMS, voice calls, WhatsApp, and video.

Transactional and marketing email delivery at scale.

Open-source product analytics, session replay, and feature flags.

Custom maps, navigation, geocoding, and location search.

Cost-effective high-volume transactional email service.

Google's multimodal AI models for text, image, and code generation.

User sign-up, sign-in, and access control for AWS apps.

Infrastructure monitoring, APM, logs, and security analytics.

Deploy and manage frontend applications and serverless functions.

Per-agent wallets with policy engine and human approval flows. Lets AI agents pay humans and vendors under scoped spend limits.

Voice AI platform for programmable voice agents. Handles calls, latency-optimised transcription, and LLM orchestration for real-time voice apps.

API aggregator designed for AI agents. Unified interface across 100+ SaaS APIs with agent-native auth.

Pre-built tools marketplace for LLM agents. Add tools with a single line and manage them through one dashboard.

Startup business bank with MCP server (beta, read-only) for balance and transaction access. SDK, OAuth, public pricing. Account opening still requires human.

Single MCP front door for agent payment flows with no key management and usage-based billing. YC-backed startup explicitly built because 'APIs weren't built for agents'.

Serverless Redis, Kafka, and QStash for edge applications.

Feature flag management for controlled rollouts and experimentation.

Distributed search and analytics engine for all types of data.

Open-weight and commercial LLMs from Mistral AI.

Read and write Notion pages, databases, and blocks.

Access Microsoft 365 data: mail, calendar, files, teams, and users.

Serverless PostgreSQL with branching, autoscaling, and instant provisioning.

Authentication, authorisation, and user management for apps.

Manage projects, pipelines, merge requests, and deployments.

Real-time content platform with GROQ query language.

CDN, DNS, DDoS protection, Workers, and R2 storage.

Content delivery and management APIs for structured content.

Framework-agnostic TypeScript auth library. Self-hosted, open-source, with built-in support for email/password, social login, 2FA, and session management.

Unified API for HRIS, ATS, CRM, accounting, file storage, and ticketing. One integration covers 200+ SaaS tools.

Unified employment API. One integration for payroll, benefits, HRIS, and employment data across 200+ providers.

Unified APIs for CRM, Accounting, HRIS, File Storage, Ecommerce, and more. Single integration across 100+ SaaS vendors.

Unified API for accounting, commerce, and banking data. Feeds SMB data into fintech and lending products.

Identity and stablecoin payments for agents. KYAPay is the 'Know Your Agent' checkout layer. Multi-language SDKs for Node/Python/Go.

Stablecoin issuance and spend API (now part of Stripe). REST SDK across multiple languages. Community MCP wrappers exist but no official one yet.

MCP server and Acceptance Toolkit for agent checkout over the Visa network. Trusted Agent Protocol for card-scheme-backed agent payments.

MCP server exposing Mastercard APIs to agents. Supports Claude, Cursor, Copilot. Pilot with select merchants and banks.

CRM, marketing, sales, and service automation APIs.

Issue tracking and project management with GraphQL API.

Access and manage Salesforce CRM data, workflows, and automation.

Event analytics with funnels, cohorts, and A/B testing.

Behavioural analytics with user journeys and experimentation.

Maps, geocoding, directions, places, and Street View.

Pub/sub messaging, presence, and real-time data sync.

Email sending, receiving, tracking, and validation.

Image and video upload, transformation, optimisation, and delivery.

Fast transactional email delivery with high deliverability.

Managed vector database for AI similarity search and RAG.

Open-source search engine optimised for instant search.

Open-source vector database for semantic search and AI apps.

Build bots, manage servers, channels, and messages.

Connect apps to bank accounts for transactions, balances, and identity.

Collect, clean, and route customer data to any tool.

Image and video analysis: faces, objects, text, and moderation.

Reactive backend with real-time queries and serverless functions.

Corporate cards, expense management, bill pay, and banking for startups via REST API.

Corporate cards, AP automation, and expense management for finance teams via REST API with OAuth 2.0.

European expense management and corporate cards. Public OAuth 2.0 API with curl examples, covering cards, expenses, receipts, and reimbursements.

Real-time WebSocket channels for notifications and live updates.

Run open-source ML models in the cloud with a simple API.

In-app chat, activity feeds, and video calling.

Enterprise LLMs for search, generation, and classification.

Translate text between 100+ languages programmatically.

Run 2M+ open-source models for NLP, vision, audio, and more.

Deploy sites, manage builds, and configure serverless functions.

Open-source, fast, typo-tolerant search engine.

Real-time and batch speech-to-text with high accuracy.

Build apps, manage stores, products, orders, and checkout flows.

Image analysis: labels, faces, text (OCR), landmarks, and logos.

Access and manage Airtable bases, tables, and records.

Messaging, live chat, help desk, and customer data platform.

Automated messaging based on user behaviour and events.

Post tweets, read timelines, manage users, and access trends.

Enterprise access to GPT, DALL-E, and Whisper on Azure.

Speech-to-text, summarisation, sentiment analysis, and content moderation.

Enterprise identity management, SSO, and MFA.

Video hosting, streaming, encoding, and analytics.

Real-time messaging, chat, and IoT data streaming.

Serverless MySQL platform with branching and non-blocking schema changes.

Access Google Analytics 4 reporting data programmatically.

Marketplace of 40,000+ APIs accessible through a single API key. Each listed API proxies through RapidAPI's gateway.

Agentic Workflow Protocol for compliant multi-step payment flows. Protocol SDK only - no MCP, no CLI yet. a16z-backed, early-access.

Manage issues, projects, boards, and workflows in Jira.

Access streams, users, chat, and analytics on Twitch.

High-quality AI translation for 30+ languages.

Email campaigns, audiences, automations, and analytics.

Real-time collaboration features: presence, cursors, and comments.

Enterprise payment platform supporting 250+ payment methods worldwide.

Access millions of free high-resolution photos.

IP geolocation databases and web services for fraud detection.

AI voice generation, text-to-speech, and voice cloning.

In-person and online payment processing, inventory, and invoicing.

PayPal-owned gateway for cards, PayPal, Venmo, and digital wallets.

Help desk, ticketing, and customer service automation.

Manage Google Ads campaigns, bidding, and reporting.

Subscription billing, invoicing, and revenue operations.

Email, SMS, chat, and marketing automation platform.

Manage tasks, projects, and teams in Asana.

File storage, sharing, and collaboration.

Google search results as structured JSON data.

Programmable voice AI API for outbound calls, customer support automation, and phone-based AI agents.

Voice AI API for programmable conversational agents. Low latency pipeline with LLM, ASR, and TTS providers configurable.

Business banking, corporate cards, AP automation, and treasury for startups and mid-market. Partner API gated behind sales.

Corporate travel booking, expense management, and corporate cards. OAuth 2.0 REST API gated behind admin-console provisioning.

Push notifications, in-app messaging, and email.

SMS, voice, video, and verification APIs.

Web3 development platform for Ethereum and other chains.

Open-source workflow automation with 400+ integrations.

Drop-in auth components with user management and session handling.

Access Spotify music catalogue, playlists, and user data.

Digital product sales with global tax handling.

Subscription management, billing, and revenue recovery.

Integrate PayPal checkout, subscriptions, and payouts.

Payments, tax, and subscriptions as merchant of record.

Multi-carrier shipping API for rates, labels, and tracking.

Sentiment analysis, entity recognition, and syntax analysis.

Multi-carrier shipping with 40+ carriers and store integrations.

Ultra-low latency video calling, live streaming, and messaging.

Manage products, orders, and customers on WooCommerce stores.

Free stock photos and videos for any project.

SMS and voice APIs, often cheaper than Twilio.

Web3 data APIs for NFTs, tokens, wallets, and DeFi.

Real-time and historical market data for stocks, options, crypto, and forex.

Access posts, comments, subreddits, and user data.

Crypto prices, market data, and exchange information.

Commission-free stock and crypto trading API.

Flight search, booking, hotel search, and travel insights.

Crypto exchange trading, market data, and account management.

Distributed document-relational database with native GraphQL.

Search worldwide news articles from 150,000+ sources.

Real-time and historical exchange rates for 170+ currencies.

Crypto trading, wallets, payments, and real-time market data.

Free stock, forex, and crypto market data and indicators.

IP address geolocation, ASN, company, and privacy detection.

Image and video recognition for visual search, face detection, and moderation.

Stable Diffusion models for image generation and editing.

Manage droplets, databases, Kubernetes, and storage.

International money transfers and multi-currency accounts.

Location services, routing, traffic, and fleet management.

Free open-source geocoding and reverse geocoding.

SMS, WhatsApp, MMS, and RCS messaging APIs.

Manage container images, repositories, and automated builds.

Search, publish, and manage JavaScript packages.

API testing, documentation, monitoring, and collaboration.

Financial data aggregation for bank accounts and transactions.

Financial data connectivity and money management tools.

Deploy apps globally at the edge with built-in orchestration.

Real-time image processing and CDN delivery.

Access Facebook and Instagram data, pages, ads, and insights.

Access Instagram business accounts, media, and insights.

Access profiles, companies, posts, and job listings.

Content publishing, user data, and video insights for TikTok.

Search videos, manage channels, playlists, and comments.

Manage pins, boards, and access Pinterest analytics.

Manage Snap ads, audiences, and campaign analytics.

Programmable search engine for custom web and image search.

Current weather, forecasts, historical data, and weather maps.

Real-time weather, forecasts, astronomy, and sports weather.

Country data including population, languages, currencies, and flags.

Astronomy picture of the day, Mars rover photos, and satellite imagery.

Email validation, IP geolocation, VAT, phone, and holiday APIs.

Company and person enrichment, lead scoring, and prospecting.

B2B company and contact data for sales and marketing.

Open-source headless CMS with REST and GraphQL APIs.

Access WordPress content, users, and settings via REST.

Full-stack observability with APM, infrastructure, and logs.

Dashboard management, alerting, and data source configuration.

WebRTC video and audio calling API for apps.

Upload, manage, and embed videos with analytics.

Enterprise live streaming and video-on-demand infrastructure.

Shipping rates, tracking, labels, and pickup scheduling.

Shipping rates, tracking, labels, and address validation.

US postal rates, tracking, address verification, and labels.

International shipping, tracking, and customs documentation.

Create and manage Facebook and Instagram ad campaigns.

Connect and automate workflows across 6,000+ apps.

Visual workflow automation connecting hundreds of services.

Read, write, and format Google Sheets data programmatically.

Manage files and folders in Google Drive.

Create, read, and manage calendar events and schedules.

Manage scheduling links, events, and availability.

Receive and parse inbound emails via webhook.

Speech-to-text transcription and translation.

Generate and edit images from text prompts.

Phone verification via SMS, voice, email, and TOTP.

Protect sites from spam and abuse with CAPTCHA challenges.

Privacy-preserving CAPTCHA alternative from Cloudflare.

Incident response, alerting, and on-call management.

Manage CI/CD pipelines, builds, and deployments.

Manage Terraform workspaces, runs, and state remotely.

Access Figma files, components, and design tokens.

Marketing email campaigns, templates, and contact management.

Search and serve GIFs and stickers in apps.

AI-powered code completion and generation.

Free AI code completion for 70+ languages.

Ticketing, knowledge base, and customer support automation.

Programmable cloud contact centre platform.

Place search, details, photos, and autocomplete.

Location data, place search, and venue information.

Flight, hotel, and car rental search and comparison.

Search and book hotels, apartments, and accommodation.

Flight data via Google's travel services.

Ride estimates, requests, and trip management.

Business search, reviews, and local business data.

Company, funding, investor, and acquisition data.

Cryptocurrency market cap rankings, prices, and charts.

Ethereum blockchain explorer data: transactions, balances, and tokens.

Computational knowledge engine for math, science, and data.

Check if email or password has been in a data breach.

Scan files, URLs, and domains for malware and threats.

Find and fix vulnerabilities in code, dependencies, and containers.

Deploy web services, databases, and static sites.

Deploy apps and databases with instant provisioning.

Sign in with Apple for web and mobile apps.

Full CRM with contacts, deals, pipelines, and marketing automation APIs.

Enterprise CRM with REST and SOAP APIs for sales, service, and marketing.

Sales-focused CRM with deal pipeline management and activity tracking.

Full-featured CRM with sales automation, analytics, and multichannel support.

AI-powered CRM with lead scoring, deal management, and built-in communication.

Sales CRM built on Monday.com with customisable pipelines and automations.

CRM built for inside sales teams with calling, email, and SMS built in.

Google Workspace-native CRM with automatic data capture and relationship tracking.

Modern CRM with flexible data modelling and real-time collaboration.

Lightweight CRM for relationship management with pipeline and enrichment features.

Scheduling automation API for booking meetings with availability rules.

Open-source scheduling platform with API for booking and availability management.

Universal API for calendar, email, and contacts across providers.

Unified calendar API with scheduling, availability, and calendar sync.

Group scheduling API for finding common availability across participants.

Appointment scheduling API with calendar sync and payment collection.

Scheduling tool with prioritised availability and overlay calendars.

Issue and project tracking API for agile teams with boards, sprints, and workflows.

Modern issue tracker with GraphQL API, cycles, and roadmap planning.

Work management API for tasks, projects, portfolios, and team collaboration.

Work OS with GraphQL API for boards, items, automations, and integrations.

All-in-one project management API with tasks, docs, goals, and time tracking.

Project management API for stories, epics, iterations, and team workflows.

Open-source project management with issues, cycles, modules, and views.

Push notification service for web, mobile, email, and in-app messaging.

Push notification API with device interests, authenticated users, and webhooks.

Notification infrastructure with workflows, preferences, and multi-channel delivery.

Open-source notification infrastructure for managing multi-channel notifications.

Multi-channel notification API with routing, preferences, and delivery tracking.

API for generating PDFs from HTML/CSS templates with dynamic data.

PDF generation API that fills templates with data and creates documents.

Docker-based API for converting HTML, Markdown, and Office docs to PDF.

JavaScript library for creating and modifying PDFs in Node.js and browsers.

Document processing API for viewing, annotating, editing, and signing PDFs.

PDF processing API for merging, splitting, compressing, and converting PDFs.

E-signature and document management API for signing workflows.

Document automation API for proposals, quotes, contracts, and e-signatures.

High-quality machine translation API supporting 30+ languages with glossaries.

Google's neural machine translation API with 100+ language pairs.

Free, open-source machine translation API that can be self-hosted.

AWS neural machine translation with custom terminology and real-time/batch modes.

Azure Cognitive Services translation API with 100+ languages and transliteration.

AI-powered translation with human quality assurance for enterprise content.

Translation management platform API for localisation workflows and content.

Translation and localisation platform API with CI/CD integration and AI translation.

Video infrastructure API for streaming, encoding, analytics, and real-time video.

Cloud-based video and image management with transformation, delivery, and AI.

Affordable video hosting and streaming with global CDN delivery.

Video API for upload, encoding, live streaming, and analytics.

Video hosting API for marketing with engagement analytics and lead capture.

Video streaming API with encoding, storage, and global delivery on Cloudflare's edge.

Real-time image and video optimisation, transformation, and delivery via CDN.

Custom maps, geocoding, navigation, and spatial data APIs.

Free, open-source geocoding API using OpenStreetMap data.

Location platform with maps, routing, geocoding, and fleet management APIs.

Maps, routing, search, and traffic APIs with real-time data.

Location and geofencing API with geocoding, search, and trip tracking.

Universal standard identifier for physical places, linking location datasets.

Location referencing API that converts coordinates to three-word addresses.

Hosted WebSocket service for real-time messaging with channels and presence.

Realtime messaging platform with pub/sub, presence, history, and guaranteed delivery.

Real-time bidirectional event-based communication library for Node.js.

Real-time database changes, broadcast, and presence via WebSocket connections.

Real-time collaboration infrastructure with presence, storage, and comments.

Serverless real-time platform running on Cloudflare Workers with rooms.

Conversational form builder API for creating and managing interactive forms.

Free form builder with an API for submissions, webhooks, and integrations.

Open-source survey platform with in-app surveys, links, and website surveys.

Survey platform API for creating surveys, collecting responses, and analysing data.

Online form builder API with submissions, payments, and conditional logic.

Google's form creation and response management API within Workspace.

Industry-leading e-signature API for document signing workflows.

E-signature API (formerly HelloSign) with embedded signing and templates.

Document automation with e-signatures, templates, and payment collection.

E-signature solution API with document signing, templates, and team management.

Adobe's enterprise e-signature API with workflows, forms, and compliance.

Financial identity verification with bank account linking and income verification.

Identity verification platform with document checks, selfie verification, and watchlists.

AI-powered identity verification with document and biometric checks.

AI-driven identity verification with document scanning and liveness detection.

Identity verification with AI and human review for global document types.

All-in-one KYC/AML verification platform with global coverage.

Enterprise feature flag platform with targeting, experimentation, and rollouts.

Feature delivery platform with targeting, experimentation, and observability.

Open-source feature flag and remote config service with self-hosting option.

Feature flags integrated with product analytics, A/B testing, and session replay.

Open-source feature management platform with strategies and constraints.

Feature gates and experiments platform with statistical analysis.

Open-source message broker with queues, exchanges, and multiple protocols.

AWS fully managed message queue service with standard and FIFO queues.

Redis publish/subscribe messaging for real-time event distribution.

High-performance cloud-native messaging system with pub/sub and request/reply.

Serverless Kafka with REST API, per-message pricing, and global replication.

Event-driven durable functions platform with retries, scheduling, and fan-out.

Global CDN with DDoS protection, edge computing, and performance optimisation.

Edge cloud platform with CDN, compute, security, and real-time analytics.

Enterprise CDN and cloud security platform with edge computing.

Affordable CDN with global edge network, storage, and stream capabilities.

High-performance CDN with instant purging, real-time analytics, and image processing.

Fast authoritative DNS with DNSSEC, load balancing, and health checks.

AWS scalable DNS with health checking, traffic routing, and domain registration.

DNS hosting and domain management with automation-friendly REST API.

Intelligent DNS with traffic steering, filtering, and real-time analytics.

Google's scalable, reliable managed DNS with 100% uptime SLA.

Cloud-based image management with real-time transformations, AI, and CDN delivery.

Real-time image processing and CDN with URL-based transformations.

High-performance Node.js image processing using libvips for resizing and conversion.

File upload and image processing API with CDN delivery and transformations.

Image optimisation API for compression, resizing, and format conversion.

Smart PNG and JPEG compression API that reduces file size with minimal quality loss.

Managed vector database for similarity search and AI applications.

Open-source vector database with hybrid search, modules, and multi-tenancy.

High-performance vector similarity search engine with filtering and payloads.

Open-source AI-native embedding database for building LLM applications.

Open-source distributed vector database built for scalable similarity search.

Serverless vector database with fast queries and cost-efficient storage.

Secrets management platform for storing, accessing, and distributing secrets.

Universal secrets manager that syncs env variables across platforms and environments.

Open-source secrets management with end-to-end encryption and CI/CD integrations.

AWS managed service for rotating, managing, and retrieving secrets.

API for accessing 1Password vault items programmatically in server environments.

Automated tax compliance with sales tax calculation, filing, and exemptions.

Sales tax API for calculation, reporting, and automated filing.

Tax compliance API built for SaaS companies with real-time tax calculation.

Digital tax compliance API for VAT/GST calculation and reporting.

Tax handling built into Paddle's merchant of record for global sales tax compliance.

Weather API with current, forecast, historical, and air pollution data.

Weather intelligence API with minute-level forecasts and actionable insights.

Weather data API with historical, forecast, and statistical weather data.

Weather API with localised forecasts, severe weather alerts, and lifestyle indices.

News API for searching and browsing articles from around the world.

REST API for live and historical news data from 7,500+ sources worldwide.

News API with top stories, similar articles, and source management.

AI-powered web data extraction with article, product, and knowledge graph APIs.

SEO toolset API with backlink analysis, keyword research, and site auditing.

Digital marketing API with SEO, PPC, content, and competitive analysis tools.

SEO API with domain authority, link analysis, and keyword research.

Google's API for search performance data, indexing status, and URL inspection.

Website crawling tool for SEO auditing with API access for automation.

Customer support platform API for tickets, agents, users, and knowledge base.

Customer messaging platform API for conversations, contacts, and help centre.

Customer support API for ticket management, automation, and knowledge base.

Customer support API with conversations, mailboxes, and knowledge base management.

Customer messaging platform with live chat, chatbot, and knowledge base API.

Open-source customer engagement platform with chat, email, and social channels.

Cloud monitoring and observability API for metrics, logs, traces, and alerts.

Full-stack observability API with APM, logs, infrastructure, and alerts.

Managed observability stack with metrics, logs, traces, and alerting.

Application monitoring API for error tracking, performance, and session replay.

Session replay and error tracking API for understanding user experience issues.

Cloud-native log management and analytics with serverless-friendly ingest.

Stripe's subscription and recurring billing API with invoicing and metered billing.

Merchant of record for SaaS with subscriptions, tax, and global payments.

Subscription management API with billing, invoicing, revenue recognition, and tax.

Subscription billing API with dunning, analytics, and multi-currency support.

All-in-one payments platform for SaaS with subscriptions, tax, and fraud protection.

Usage-based billing API with event ingestion, metering, and flexible pricing.

Blockchain development platform with node APIs, NFT tools, and enhanced APIs.

Web3 data API for token prices, balances, NFTs, and DeFi across chains.

Ethereum and IPFS node infrastructure API for blockchain applications.

Multi-chain blockchain node provider with enhanced APIs and marketplace add-ons.

Solana-focused RPC and API platform with webhooks, DAS, and enhanced APIs.

Payroll and HR API for managing employees, pay runs, benefits, and tax.

Unified HR, IT, and finance platform API for employee lifecycle management.

HR software API for employee data, time tracking, hiring, and performance.

Global payroll and compliance API for hiring contractors and employees worldwide.

Global employment platform API for onboarding, payroll, and compliance.

Multi-carrier shipping API for rates, labels, tracking, and address validation.

Shipping API with rate shopping, label generation, tracking, and insurance.

Multi-carrier shipping API for rates, labels, tracking, and returns.

Shipment tracking API supporting 1,000+ carriers with delivery notifications.

Shipping platform with discounted rates, labels, and multi-carrier support.

Free shipping software with USPS and UPS discounted rates for small businesses.

Search podcast transcripts, monitor brands/topics, and get real-time episode data via webhooks.

Custom AI chat interface with plugin system, MCP support, and team management API.

Free JSON API for remote job listings across engineering, design, marketing, and more.