Best API Tools (2026)

Free MQM annotation tool for evaluating translation quality. Mark errors by category and severity, set custom weights, and export as CSV, TSV, JSON, or PDF. No installation and no signup required.

Build social media features at scale. Zernio provides a single API for publishing, inbox, analytics, and account management across 14 platforms, so you can ship product instead of wasting time with platform APIs.

Deepfake technology has powerful uses but is increasingly exploited for scams, causing financial and reputational harm. Media‑Ana is an AI-driven analytics platform that detects deepfakes, impersonations, and manipulated images and videos. It also verifies altered cheques and AI-generated receipts. With an available API, we invite developers to integrate Media‑Ana and help combat AI-enabled fraud.

Get accurate IP geolocation, threat detection, and security signals without worrying about request limits or overage fees. Built for developers who want predictable pricing and reliable data.

ClawPhone gives AI agents their own phone numbers. Provision a number via API, receive SMS in real-time, OTP codes auto-extracted. Your agent can now pass verification for Stripe, Google, AWS, banking, and more with no human in the loop.

Most video recording APIs charge you per minute, per egress, per transcode — then you still need separate vendors for transcription and storage. VIDTREO bundles everything into one SDK at $0.01/min: recording, transcoding, AI transcription & summaries, and cloud storage. No egress fees. No monthly minimums. 10 lines of code to integrate. React, vanilla JS, or Web Components. 62% cheaper than Ziggeo, 90% cheaper than Addpipe. Free tier included.

Most speech-to-text APIs are benchmarked on clean audio. Real-world audio is different — background noise, overlapping speakers, heavy accents, technical vocabulary, and unpredictable recording conditions. Speechmatics STT is built for that. High accuracy across 55+ languages, real-time and batch processing, and flexible deployment across cloud, on-prem, hybrid, and offline environments. Trusted by enterprises for over 10 years. API access available today.

Svara is a REST API for sending native voice notes on LinkedIn, Telegram, WhatsApp, and 6 more platforms. Your voice note arrives as a real native message, not a link or attachment. Send any audio format, we handle conversion and delivery. One POST request, one endpoint. 50 free voice notes, no credit card required. Built by a solo non-technical founder using AI.

a_OCR converts unstructured documents like PDFs and images into accurate, structured data ready for any workflow. Our multi-pass document processing pipeline combines advanced OCR with vision-language models to deliver state-of-the-art accuracy, reliability, and scalability at production scale.

Unified AI API gateway for multiple LLM providers with streaming, custom configs, built-in packages, routing, rate limits, failover, and analytics.

Add AI agents to your product with one API call. Each agent gets its own isolated VM, HTTPS endpoint, and OpenAI-compatible API. Usage-based pricing.

Docpose.Cloud is a powerful online file converter and developer-friendly API supporting 432+ formats and 34,000+ conversion pairs. Convert documents, images, audio, and 4K/8K video securely in the cloud. Built for SaaS teams, automation workflows, and businesses that need fast, scalable, and reliable file transformation without managing infrastructure.

Shippy is an API client built for focus. Real-time collaboration, shared workspaces, environment variables, and MCP server — everything your team needs to test APIs together. Free for 1-2 devs. $5/user/month for teams.

Voiden.md is an Open Source, offline-first, Git-native API workspace that unifies specs, docs, tests, and mocks using programmable Markdown blocks. Voiden helps developers, Testers and Technical Writers to build and Test APIs the way they actually work.

A Supabase, Directus or Airtable alternative that actually gets out of your way. Start for free, scale globally. Not another AI platform. Anythink is your backend, sorted. From idea to live API in minutes. From Enterprise to Vibes, we've got you covered. AI makes a nice frontend, but turning that into a business is where the weeks disappear. With Anythink, you get database, APIs, user management, Stripe payments, workflows, access control and search, all without touching code and infrastructure.

PingPulse is a webhook‑driven workflow debugger that turns simple curl‑style pings into structured timelines for your pipelines, cron jobs, and AI‑agent workflows. It monitors long‑running processes and AI‑driven interactions, then triggers alerts when anomalies or failures occur—giving engineers and AI systems clear breadcrumbs to answer “what broke?” in minutes instead of hours.

Many websites don't have public APIs. Anything API fills that gap. Turn any browser work into a production-ready API. Describe the task, and our agents build a custom function that calls the site directly. Ship a custom API endpoint you can deploy serverless, schedule on Cron, or call via API. Tell Notte what you need. We ship the function endpoint.

ZenMux is an enterprise-grade LLM gateway that makes AI simple and assured for developers through a unified API, smart routing, and an industry-first automatic compensation mechanism.

🧠 𝐌𝐧𝐞𝐱𝐢𝐮𝐦 = persistent memory for LLM apps. Add one 𝐦𝐧𝐱 object and get chat history, semantic recall, and user profiles that follow users across sessions and providers. 🔄 Works with 𝐂𝐡𝐚𝐭𝐆𝐏𝐓 and 𝐂𝐥𝐚𝐮𝐝𝐞 — same memories, any model. Switch mid-conversation without losing context. ⚙️ No vector DBs or pipelines. A/B test, fail over, and route by cost — your memory layer stays consistent.

AgentReady is an API toolkit that makes the web readable for AI agents. Our flagship tool TokenCut compresses text before it hits GPT-4, Claude, or any LLM — same meaning, fewer tokens, lower bill. Plus 6 more tools: MD Converter, Sitemap Generator, LLMO Auditor, Structured Data, Robots.txt Analyzer, and Image Proxy. Free during beta. 3 lines of code to integrate.

Flux records API executions so you can replay failures locally, fix them, and resume execution safely. Instead of guessing from logs, you get the exact request, inputs, and behavior. Same request. Same IO. Same outcome.

App teams waste hours every week manually exporting CSVs from App Store Connect, Google Play, Apple Ads, and Google Ads just to build reports. Easy App Reports fixes that. Connect your developer accounts in minutes, and your data flows automatically to Looker Studio, BigQuery, and all MCP-compatible AIs on autopilot, forever. Official APIs only. No scraping, no shady cookie hacks. Built for app teams who'd rather ship than wrestle with spreadsheets.

Most AI apps waste 70% of their budget. Wrong models. No caching. Payment fees that destroy micropayments. P402.shop: Compare 50+ AI APIs (GPT-5.2, Claude Opus 4.5, Gemini 3, more). Find the right model for your use case. See costs explode from 100 to 1M users. Free. P402.io: Accept micropayments without Stripe's $0.30 killing you. 1% flat fee. Built on x402—HTTP's payment standard, finally working. Vibe-coded apps break at scale. Optimized ones don't.

Ollang is the AI language execution layer for localization across web, apps, video, audio, and documents. Use MCP to let AI agents run workflows, SKILLS for reusable agent actions, the SDK to scan and apply translations, and the API to build end-to-end localization pipelines. One platform for multimodal localization and production-ready developer integration.

Ship gamification fast with flexible APIs for achievements, streaks, points, and leaderboards. Configure features without coding, automate personalized email and push notifications, and monitor impact on retention and engagement from a dashboard.

Mockphine keeps frontend and QA moving when backends are unstable. It lets teams mock blocked endpoints, pass through ready ones, and prove exactly what served each response; control unmatched routes with strict 404 or fallback passthrough; and inspect served-by source, status, duration, headers, and bodies in Live View. Deterministic matching plus delay/failure simulation helps catch integration bugs before release.

Agents surf the internet more than we carbons do. They find interesting things and recommend them to their humans. In this, if your website isn't friendly to an agent, it's likely not being discovered. L0-L5 is an open standard for ranking websites based on how silicon friendly they are. PS: We create a detailed report of your website you can download and give to your agent to make your website silicon friendly.

SCRAPR is a new approach to web data extraction. Instead of relying on fragile DOM selectors or heavy browser automation, SCRAPR looks at how modern websites actually load their data and extracts structured responses directly from those sources. The goal is to make web data pipelines faster, more reliable, and easier to maintain. Right now SCRAPR is in early MVP and we’re looking for developers, data teams, and AI builders who need clean structured data from websites.

Building AI chat features often means too much complexity — SDKs, databases, and infrastructure — just to support conversations and memory. Conversations API removes that overhead. Build stateful AI chat without managing backend systems. All chat data is stored for you — you only keep the conversation_id. What it helps with – AI chat memory & state – Faster prompt iteration – No backend setup – Ideal for low-code builders Built after helping builders stuck on AI chat infra instead of product.

OpenClawCity is a persistent 2D city built entirely for AI agents. Agents register with a single API call, get a character and a JWT, and start living walking through zones, entering studios, creating art/music/stories, discovering other agents’ work, collaborating, and evolving their identity over time. The city runs 24/7. Culture emerges from what its residents create To send your agent ask it to: "Run: npx clawhub@latest install openclawcity --force. Then read the SKILL.md file"

Sheet Ninja turns any Google Sheet into a live API in seconds. Your data already exists. Stop rebuilding it in clunky databases. Paste a link, get endpoints. Build with Lovable, Bolt, or Replit and your data stays in Sheets. Your clients edit like a spreadsheet. Your app reflects it instantly. No backend, no redeployments, no calls from confused clients.

The intelligent architecture diagramming tool for modern engineering teams. Design, simulate, and document in minutes.Archimyst is an AI-powered system design platform that transforms ideas into production-ready backend architectures. Generate, simulate, and validate cloud systems in minutes by stress-testing performance, cost, and failure scenarios before they reach real users.

moltdj is an API-first music and podcast platform for OpenClaw agents. Bots generate tracks and podcasts, build social followings, tip each other in USDC, and earn from a daily royalty pool — all without a browser. 1,500+ tracks from 100+ AI agents.

PredictLeads Technographics Dataset provides structured data on what technologies companies use, sourced from company websites, job descriptions, DNS records, cookies, and more. Each detection includes first/last seen timestamps and the signals used, so you can track adoption curves, technology migrations, and competitive shifts over time. Available via API, flat files, and webhooks, with an MCP server for AI agents.

Callio is a unified API gateway for AI agents. Instead of managing auth, rate limits, and keys for every API your agent uses, connect them all through one proxy. Works with Claude Code, Cursor, Antigravity, and any MCP-compatible tool. Browse APIs, generate a single Callio key, and start calling — we handle auth injection, usage tracking, and billing. Free tier included. One key, every API, zero config

Chat is an MCP client that lets you connect your own service’s MCP server and instantly expose it through a chat interface. Instead of building a full frontend or website, you only focus on backend logic and business workflows. Launch MVPs faster, iterate quickly, and turn APIs, AI tools, and automation services into usable products through chat.

Octrafic is an open-source CLI for API testing. Point it at any OpenAPI spec or live endpoint, describe what you want to test in plain English, and let it handle the rest - from generating requests to validating responses and exporting a PDF report. No test scripts, no GUI, no mocks. Just a single binary. Works with OpenAI, Claude, Ollama, and any OpenAI-compatible provider

RedUp: pay for tokens for what you need: full-stack Reddit posting, scheduling, analytics platform (and API) — built for creators, marketers, agencies, developers who want power without risking bans (or building fragile bots). **What You Can Do With RedUp** * Smart Reddit Scheduling, subreddit discovery, post-spinning (variations per subreddit to meet their audience and rules) * Schedule posts across multiple subreddits * Post at optimal times per subreddit * Avoid spam patterns/risky behavior

One API. Full Claw infrastructure. Chowder is the fastest way to deploy, manage, and talk to your OpenClaw instances — from anywhere. Spin up fully isolated claws in seconds. Connect them to 11 messaging channels. Install skills. Manage auth. Persist memory. All through a single OpenAI-compatible API. From zero to deployed in under a minute.

Luzo is a desktop-first, open-source tool for building, running, and debugging multi-step API workflows. Instead of treating requests as isolated calls, it lets you design dependency-aware flows, pass variables between steps, inspect execution through a live timeline, and retry from failure without restarting everything. Built for developers and QA teams working with real API workflows, not just single requests.

Control your notifications without code changes. Route to Slack, Discord, Email & more. Mute noisy alerts, throttle chatty services, and escalate critical issues—all from a web UI. Built-in retries, real-time dashboards & AI agent integration.

Postproxy is a unified publishing API for social networks. Built for developers who automate content at scale. One endpoint, explicit states, built-in retries. And scheduling, of course.

Raw bank transaction strings are a mess. "SQ VERVE", "AMZN MKTP USAB1234", "PP*SHOPIFY", nobody knows what these mean, and neither do your users. Triqai is a transaction enrichment API that transforms raw banking data into clean, structured merchant intelligence. One API call gives you everything you need.

Context.dev (previously Brand.dev) gives your AI agents and apps real-time access to structured web data, no brittle scraping infrastructure needed. Scrape any URL as clean markdown or HTML, extract brand data (logos, colors, fonts, socials) from any domain, crawl sitemaps, resolve transaction descriptors, and more. Typed SDKs for TypeScript, Python, and Ruby. Trusted by 5,000+ businesses including Mintlify, Daily.dev, Ferndesk.com, and more. Most teams integrate in under 10 minutes.

Clawcard is the first unified credential system for agents - one key provisions and manages credit cards, email, and a phone number. No cobbling together multiple services. No babysitting your agent through verification steps. When your agent needs to make a purchase, then verify via email or SMS, then manage an account, it can handle the entire flow without you intervening.

Never miss a webhook again. HookWatch monitors, logs, and retries your webhooks automatically. Built for indie hackers and small teams. HookWatch monitors your webhook endpoints 24/7 and alerts you instantly when something breaks. Built for developers who need reliable monitoring without enterprise complexity. Simple setup, affordable pricing, peace of mind.

Kokori TTS app for macOS: Transform text to speech with a powerful local API server & desktop app. High-quality voices, speed control, and seamless menubar integration.

Didit replaces fragmented identity tools with one platform. KYC, biometrics, liveness, and fraud detection orchestrated together — one source of truth, fewer manual reviews, faster onboarding. Works globally across devices and low connectivity. 500 free checks/month, pay-per-use after. No contracts. 1,000+ companies. GDPR & ISO 27001 certified.

Headless CMS and Visual Editing have a long-standing love-hate relationship. Our approach to is aimed at making it dead easy for developers to implement Visual Editing in DatoCMS, to let content editors get the WYSIWYG effect seamlessly. Combined with draft mode and real-time updates, making changes is a breeze. No more hunting through record forms to find the right field.

Discover, build, and monetize APIs & App/Tools with FireAPI. Access thousands of APIs, create custom scraping solutions, manage API analytics, and monetize your APIs with flexible pricing. Perfect for startups, SaaS, and enterprises.

Quetzly helps developers, GIS and IT teams test, monitor, and visualize geospatial APIs. Send http requests, adjust headers and query params, and inspect JSON with an integrated editor. Render WMS, WFS, GeoJSON and ArcGIS services on an interactive map, toggle layers, zoom to extents, and export data as GeoJSON or Shapefile. Track endpoint health to reduce downtime and keep location services reliable. Quetzly is currently in open Beta. Try it for free.

Turn the chaotic web into clean Markdown. Access a suite of APIs to feed your legacy and AI apps without the infrastructure overhead.

Echolon - A powerful, local-first API client. Open source alternative to Postman with Git integration, offline support, and multi-protocol capabilities.

PitchBook and Crunchbase will charge you thousands to even touch their APIs. Fundable gives you an API key on signup, no credit card need, and you can buy credits as you go (first 200 credits are on us). Use it to track funding rounds, enrich leads, find investors, or whatever else you're cooking up.

Polyvia is the first Visual Knowledge Index for Agents & MCPs. Turn scattered visuals into a queryable source of truth with every fact disambiguated. Other tools extract visuals OR index text — Polyvia indexes and reasons over visuals, connecting facts across 10,000s of documents. Built for developers of multimodal agents and knowledge-work teams.

Coresignal's Data Search Lists lets you build B2B data lists using natural language and easily query multi-source company, employee, and jobs data. Just describe what you need, and our AI agent will generate a structured lead list you can preview, refine, and download instantly.

Every agent turn, you're resending the full context. Again. That overhead compounds fast. WebSocket Mode for the Responses API keeps a persistent connection, sends only incremental inputs, and cuts end-to-end latency by up to 40% on heavy tool-call workflows.

Turn Google Sheets into a full REST API in seconds. Get GET, POST, PUT, and DELETE endpoints instantly to power apps and sites. No-code, free, and updates in real-time.

MiniMax M2.7 is a self-evolving AI model that helped build its own capabilities. It can create agent harnesses, collaborate via Agent Teams, and handle complex tasks like coding, debugging, and research. With strong SWE-Pro performance and reduced intervention time, it moves beyond static AI into systems that continuously learn, adapt, and execute complex work with minimal human input. Available via API and MiniMax Agent for builders pushing AI-native workflows.

Create free mock REST APIs and LLM streaming endpoints instantly. Perfect for frontend devs, testers, and AI builders. No signup required.

Perplexity's API now covers the full agent stack: multi-provider model access, real-time search on 200B+ URLs, and SOTA embeddings. One key, one bill, direct provider pricing. Built for developers who are tired of stitching together five vendors to ship one thing.

MAI-Transcribe-1 is Microsoft’s new multilingual speech-to-text model built for real-world audio. It delivers best-in-class accuracy across 25 languages, strong robustness in noisy environments, faster batch transcription, and pricing aimed at production speech workflows.

Mercury Edit 2 is a coding-focused diffusion LLM built specifically for next-edit prediction. It uses your recent edits and codebase context to suggest the next change, with much higher acceptance and much lower latency than typical code-edit models.