Best APIs of May 2026

1. 1

   1. General Compute

   315 upvotes

   AI models that run on an inference cloud optimized for speed

   GPUs are built for training, not inference. General Compute is an inference cloud running on ASICs — purpose-built alternatives to Nvidia silicon designed specifically for inference. We deliver 5x faster responses and higher per-user…

   #3 on May 22, 2026generalcompute.com1 maker, 1 with an email
2. 2

   2. Wingbits AI

   263 upvotes

   AI agents for real-time aircraft monitoring and alerts

   Create agents that monitor airspace activity 24/7 - military aircraft in a region, private or government jets, a GPS-jamming spike, or a travelling friend or family member - and get alerts the moment something relevant happens. Or just…

   #2 on May 30, 20261 maker
3. 3

   3. Theneo

   245 upvotes

   The API management platform for humans and agents

   The all-in-one platform to design, document, manage, and observe your APIs. Built for the developers shipping them, the customers integrating them, and the agents now calling them at scale.

   #4 on May 13, 2026theneo.ai2 makers
4. 4

   4. Marx Finance

   235 upvotes

   AI agents debate the markets

   Agent first platform where autonomous AI agents discuss news, share market signals, and debate positions. It is a social layer for agents to analyze recent events from a financial perspective.

   #3 on May 1, 20261 maker
5. 5

   5. tweet.md

   231 upvotes

   X posts as clean Markdown

   Get any X post or thread as clean Markdown for LLMs, agents, and research. Swap x.com for tweet.md or use the API.

   #5 on May 25, 2026tweet.md1 maker
6. 6

   6. Lingo.dev v1

   227 upvotes

   Localization engineering platform for consistent translation

   On Lingo.dev, teams configure localization engines: Stateful translation APIs with glossaries, brand voice rules, per-locale model chains, and AI quality scoring, and then call them via API, CLI, CI/CD, or MCP.

   #3 on May 7, 2026YC F24lingo.dev1 maker, 1 with an email
7. 7

   7. Buffer API

   218 upvotes

   One API to publish across every social platform.

   Buffer's API lets you publish and manage content across 11 social platforms through a single endpoint. Connect it to AI assistants, no-code automation tools, or build full custom integrations. Ships with an MCP server, pre-built…

   #5 on May 28, 20261 maker
8. 8

   8. MCP Bridge by Appfactor

   210 upvotes

   Connect any API to any AI agent

   Point MCP Bridge at any REST, GraphQL, SOAP, or gRPC API. It auto-generates MCP tool definitions with typed schemas, auth, rate limiting, and response processing. Your LLM agents call enterprise APIs through one standard interface.

   #6 on May 29, 2026appfactor.io1 maker
9. 9

   9. Parrot Speech-to-text API

   191 upvotes

   Fast, accurate STT for production-grade voice agents

   Introducing Parrot: Ringg’s speech-to-text model for production-grade voice agents. Capture Hindi-heavy and noisy real-world conversations with low-latency inference, stronger transcript quality, and Hindi validation built for downstream…

   #5 on May 26, 20261 maker
10. 10

    10. Resend Automations

    174 upvotes

    Build event-driven email flows

    Build event-driven email workflows with triggers, conditions, delays, and full run visibility.

    #8 on May 14, 20261 maker
11. 11

    11. Gemini 3.1 Flash-Lite

    165 upvotes

    Lightweight Gemini model for high-volume AI pipelines

    Gemini 3.1 Flash-Lite runs tool calling, classification, translation, and multimodal processing via API on Google's Gemini Enterprise Agent Platform. For AI engineers building high-volume, latency-sensitive agent pipelines in production.

    #4 on May 16, 20261 maker
12. 12

    12. Integuru

    156 upvotes

    Generate fast, reliable APIs for any platform. No browsers

    Integuru generates fast, reliable APIs for any platform, without browsers or RPA. API calls complete in ~3 seconds with 99.9%+ success. Most agents today use browser automation to control web apps that lack official APIs, but this is slow…

    #7 on May 29, 2026YC W24integuru.com1 maker, 1 with an email
13. 13

    13. Parsewise API

    131 upvotes

    API for agentic multi-document processing

    One API call replaces the entire document processing pipeline. You send multiple documents and a desired output schema; you get back resolved values, flagged contradictions, and full lineage down to the source words, pages, and documents…

    #11 on May 26, 20261 maker
14. 14

    14. LLMTest

    124 upvotes

    Use the right LLMs in your apps. Setup fallbacks. Be happy.

    "OpenRouter + Intelligence" LLMTest helps devs and vibe coders automatically: ✅ Pick better models for AI-powered features (faster, cheaper, better, sometimes all 3 combined) ↪️ Automatically add fallbacks when LLM providers fail (API is…

    #9 on May 25, 20261 maker
15. 15

    15. APIEval-20

    121 upvotes

    An open benchmark for AI agents that test APIs

    APIEval-20 is a black-box benchmark for API testing agents. Each agent gets only a JSON schema and one sample payload, then generates a test suite. We run those tests against live reference APIs with planted bugs and score bug detection…

    #12 on May 8, 20261 maker
16. 16

    16. InstaVM

    109 upvotes

    Instant computers for AI agents

    The production control plane for AI agents. Run agents like production servers: isolated, observable, and controlled. Firecracker microVMs with sub-200ms boot.

    #17 on May 21, 2026instavm.io1 maker, 1 with an email
17. 17

    17. Krater

    105 upvotes

    All the AI tools you use, one subscription

    Krater turns AI from something you try into something you use. Every AI model, every modality, every app you use, combined into one chat and driven by one agent. Tell it what you need in plain language and it gets it done; whatever you're…

    #11 on May 27, 2026krater.ai1 maker, 1 with an email
18. 18

    18. KugelAudio

    105 upvotes

    Real-time text-to-speech model you can self-host

    Most natural real-time TTS with voice cloning and sub-60ms latency, on-prem or via API. Grammar-aware normalization reads phone numbers, IBANs, addresses, and medications naturally across 25+ languages, with word-level timestamps and IPA…

    #16 on May 28, 2026YC X261 maker
19. 19

    19. pixserp

    105 upvotes

    Your LLM on the live web. One endpoint, ten answer shapes.

    pixserp is the AI-native search engine for builders. One endpoint, ten live-web answer shapes — search, news, images, places, shopping, flights, hotels, YouTube, transcripts, any URL — cited by default. Drop-in for the OpenAI SDK. Flat…

    #14 on May 18, 2026pixserp.com1 maker, 1 with an email
20. 20

    20. Papr Graph

    104 upvotes

    Upgrade to graph-native vector embeddings

    Papr Graph transforms semantic embeddings into graph-native embeddings with one API call. It encodes temporal, topical, and other dimensions within any embedding, helping agents retrieve answers based on correctness, not just semantic…

    #18 on May 19, 20261 maker
21. 21

    21. Luma Uni 1.1 API

    96 upvotes

    A reasoning model that interprets intent before it generates

    A reasoning model that interprets intent before it generates. Less than half the price and latency of comparable models. Two endpoints. Python, JS/TS, Go SDKs & CLI. Production grade from day one.

    #12 on May 7, 2026
22. 22

    22. Agentspan

    93 upvotes

    Open-source runtime for durable AI agents

    Agentspan is an open-source server and SDK for running AI agents as durable workflows. You can define agents programmatically, execute them server-side, and inspect each run and execution state in the UI. Agentspan adds crash recovery…

    #19 on May 18, 20261 maker
23. 23

    23. Extend

    88 upvotes

    Parse any PDF layout with SOTA accuracy for AI pipelines

    Parse, extract, and split your hardest documents with unmatched accuracy. Read any layout with specialized vision models, and ship reliable pipelines in minutes, not months.

    #17 on May 27, 2026YC W23extend.ai1 maker
24. 24

    24. AgenticCalling AI

    74 upvotes

    Give your AI the power to make phone calls

    Give your AI a dedicated phone number and the power to make calls. AgenticCalling lets Claude, ChatGPT, OpenClaw or any custom agent execute unscripted, goal-oriented calls. We handle the messy infra - Numbers, A2P, IVRs, voicemails, &…

    #29 on May 27, 20261 maker
25. 25

    25. Agent-Ready Docs Benchmark

    53 upvotes

    Score any docs site for AI-agent usability

    Run a public benchmark on any docs site and see whether AI agents can discover, parse, and trust the docs well enough to use the product.

    #19 on May 9, 20261 maker

Junior imports every day's Product Hunt leaderboard. Each launch is filed under the first topic its makers chose, so it appears in one category only. This list takes the API launches dated in May 2026 and ranks them by their upvotes. It refreshes daily.

• Best Productivity Tools214
• Best Design Tools76
• Best Open Source Tools67
• Best Developer Tools58
• Best Mac Apps46
• Best Android Apps37
• Best Marketing Tools38
• Best AI Tools41
• Best SaaS Tools27
• Best iOS Apps23
• Best Chrome Extensions28
• Best Analytics Tools27
• Best Health & Fitness Apps23
• Best Social Media Tools13
• Best Sales Tools20
• Best Fintech Tools25

• All APIs340
• Every launch in May 2026
• All best-of lists

What was the top API launch of May 2026?

General Compute ("AI models that run on an inference cloud optimized for speed"), with 315 upvotes on May 22, 2026, where it finished #3 of the day.

How many APIs launched in May 2026?

36 on Product Hunt, with 4,065 upvotes between them. This list shows the 25 most upvoted.

How is this list ranked?

By Product Hunt upvotes, as recorded on launch day. Ties go to the launch with the better daily rank. Every launch is counted once, in the category its makers listed first.

How do I reach the makers of these APIs?

Each launch links to its page on Junior, with the people behind it (25 makers across this list). Junior adds their verified work emails, LinkedIn and X profiles for subscribers.