Best CLI APIs for Claude Code in 2026

Access Claude models for reasoning, coding, and analysis.

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

Programmable SMS, voice calls, WhatsApp, and video.

Authentication, authorisation, and user management for apps.

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

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

Deploy and manage frontend applications and serverless functions.

Scalable object storage for any type of data.

Run code without provisioning servers, triggered by events.

Unified object storage with global edge caching.

Massively scalable object storage for unstructured data.

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

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

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

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

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

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

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

Payments infrastructure for platforms and marketplaces.

Translate text between 100+ languages programmatically.

Sentiment analysis, entity recognition, and syntax analysis.

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

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.

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

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

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

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

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

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

Cost-effective high-volume transactional email service.

Developer-first email API built for modern applications.

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

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

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

Manage projects, pipelines, merge requests, and deployments.

Deploy sites, manage builds, and configure serverless functions.

Application error monitoring, performance tracking, and alerting.

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

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

Manage droplets, databases, Kubernetes, and storage.

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

NoSQL cloud database with real-time sync across clients.

Access MongoDB data via HTTPS endpoints without drivers.

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

Serverless Redis, Kafka, and QStash for edge applications.

Serverless PostgreSQL with branching, autoscaling, and instant provisioning.

Managed vector database for AI similarity search and RAG.

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

Distributed search and analytics engine for all types of data.

Open-source search engine optimised for instant search.

Content delivery and management APIs for structured content.

Real-time content platform with GROQ query language.

Read and write Notion pages, databases, and blocks.

Infrastructure monitoring, APM, logs, and security analytics.

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

CRM, marketing, sales, and service automation APIs.

Open-source workflow automation with 400+ integrations.

Cross-platform push notifications for mobile and web.

Reactive backend with real-time queries and serverless functions.

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.

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

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.

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

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

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'.

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

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

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

Enterprise LLMs for search, generation, and classification.

Open-weight and commercial LLMs from Mistral AI.

Integrate PayPal checkout, subscriptions, and payouts.

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

Enterprise payment platform supporting 250+ payment methods worldwide.

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

Manage products, orders, and customers on WooCommerce stores.

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

Custom maps, navigation, geocoding, and location search.

IP geolocation databases and web services for fraud detection.

Transactional and marketing email delivery at scale.

Email sending, receiving, tracking, and validation.

Fast transactional email delivery with high deliverability.

SMS, voice, video, and verification APIs.

SMS and voice APIs, often cheaper than Twilio.

Real-time WebSocket channels for notifications and live updates.

Enterprise identity management, SSO, and MFA.

Crypto exchange trading, market data, and account management.

Commission-free stock and crypto trading API.

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

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

Distributed document-relational database with native GraphQL.

Build bots, manage servers, channels, and messages.

Build apps, bots, and workflows for Slack workspaces.

Google search results as structured JSON data.

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

Behavioural analytics with user journeys and experimentation.

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

Access Google Analytics 4 reporting data programmatically.

Video hosting, streaming, encoding, and analytics.

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

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

Email campaigns, audiences, automations, and analytics.

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

Email, SMS, chat, and marketing automation platform.

Automated messaging based on user behaviour and events.

Read, write, and format Google Sheets data programmatically.

Manage files and folders in Google Drive.

File storage, sharing, and collaboration.

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

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

Issue tracking and project management with GraphQL API.

Manage tasks, projects, and teams in Asana.

Create, read, and manage calendar events and schedules.

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

Receive and parse inbound emails via webhook.

Speech-to-text transcription and translation.

Generate and edit images from text prompts.

Subscription management, billing, and revenue recovery.

Subscription billing, invoicing, and revenue operations.

Payments, tax, and subscriptions as merchant of record.

Digital product sales with global tax handling.

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

Feature flag management for controlled rollouts and experimentation.

Marketing email campaigns, templates, and contact management.

High-quality AI translation for 30+ languages.

Free stock photos and videos for any project.

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

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

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

Help desk, ticketing, and customer service automation.

Programmable cloud contact centre platform.

Place search, details, photos, and autocomplete.

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

Web3 development platform for Ethereum and other chains.

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

Push notifications, in-app messaging, and email.

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

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

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

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

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.

Stable Diffusion models for image generation and editing.

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

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

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

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

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

Search videos, manage channels, playlists, and comments.

Programmable search engine for custom web and image search.

Search worldwide news articles from 150,000+ sources.

Open-source headless CMS with REST and GraphQL APIs.

Access and manage Airtable bases, tables, and records.

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

Dashboard management, alerting, and data source configuration.

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

Incident response, alerting, and on-call management.

Manage CI/CD pipelines, builds, and deployments.

Manage Terraform workspaces, runs, and state remotely.

Access millions of free high-resolution photos.

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

Deploy web services, databases, and static sites.

Deploy apps and databases with instant provisioning.

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.

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.

International money transfers and multi-currency accounts.

Location services, routing, traffic, and fleet management.

Manage container images, repositories, and automated builds.

API testing, documentation, monitoring, and collaboration.

Real-time image processing and CDN delivery.

Access posts, comments, subreddits, and user data.

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

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.

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

Access Spotify music catalogue, playlists, and user data.

Upload, manage, and embed videos with analytics.

Manage Google Ads campaigns, bidding, and reporting.

Create and manage Facebook and Instagram ad campaigns.

Connect and automate workflows across 6,000+ apps.

Manage scheduling links, events, and availability.

Access Figma files, components, and design tokens.

Search and serve GIFs and stickers in apps.

Ticketing, knowledge base, and customer support automation.

Location data, place search, and venue information.

Flight, hotel, and car rental search and comparison.

Computational knowledge engine for math, science, and data.

Google sign-in and OAuth 2.0 authorisation for apps.

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

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

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

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

SMS, WhatsApp, MMS, and RCS messaging APIs.

Search, publish, and manage JavaScript packages.

Financial data aggregation for bank accounts and transactions.

Financial data connectivity and money management tools.

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

Access Instagram business accounts, media, and insights.

Manage pins, boards, and access Pinterest analytics.

Manage Snap ads, audiences, and campaign analytics.

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

B2B company and contact data for sales and marketing.

Access WordPress content, users, and settings via REST.

WebRTC video and audio calling API for apps.

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.

Visual workflow automation connecting hundreds of services.

Protect sites from spam and abuse with CAPTCHA challenges.

Privacy-preserving CAPTCHA alternative from Cloudflare.

Search and book hotels, apartments, and accommodation.

Flight data via Google's travel services.

Business search, reviews, and local business data.

Company, funding, investor, and acquisition data.

Crypto prices, market data, and exchange information.

Cryptocurrency market cap rankings, prices, and charts.

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

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

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

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.

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

AI-powered code completion and generation.

Free open-source geocoding and reverse geocoding.

Ride estimates, requests, and trip management.

Access profiles, companies, posts, and job listings.

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

Free AI code completion for 70+ languages.

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.