You asked about API
51 people built something like it. 0 are gone.
That is 0% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2022-01-10 | databar.ai | still up |
| 2016-01-01 | YCDeepgram Building foundational AI for speech transcription and understanding. · deepgram.com | still up |
| 2020-06-01 | Power commerce photography with generative AI · photoroom.com | still up |
| 2017-01-01 | Document AI. One API Call. · veryfi.com | still up |
| 2021-06-01 | YCAnakin One API to get clean data from any website for your AI agents at scale · anakin.io | still up |
| 2017-06-01 | The best way to build Voice AI apps · assemblyai.com | still up |
| 2021-01-01 | YCMindee AI Document Understanding API · mindee.com | still up |
| 2021-01-01 | YCVapi Voice AI for developers. · vapi.ai | still up |
| 2023-08-20 | superfunctions.versoly.page | still up |
| 2022-01-01 | Unleashing the potential of DNA and RNA based therapies using AI · whitelabgx.com | still up |
| 2019-01-01 | YCOverview Reshaping industrial quality with AI, hardware, and software · overview.ai | still up |
| 2020-01-01 | The API to get recordings, transcripts, and metadata from meetings · recall.ai | still up |
| 2020-01-01 | YCHandoff AI estimator & agent for remodelers. · handoff.ai | still up |
| 2023-01-01 | YCMetal The AI context platform for private capital. Everything your firm… · metal.ai | still up |
| 2023-09-14 | eesel.ai | still up |
| 2022-06-01 | YCIntuned Code-first scrapers and RPAs — built and maintained by AI · intunedhq.com | still up |
| 2025-01-01 | AI voice and texting agents · leapingai.com | still up |
| 2022-01-01 | Rapid medical data annotation · redbrickai.com | still up |
| 2022-06-01 | YCTypewise Customer service AI that resolves requests end-to-end. · typewise.app | still up |
| 2024-06-01 | Capitol: the sovereign operating system for intelligence. · capitol.ai | still up |
| 2023-01-01 | YCLiteLLM Call every LLM API like it's OpenAI [100+ LLMs] · litellm.ai | still up |
| 2025-06-01 | Email Inboxes for AI Agents · agentmail.to | still up |
| 2023-06-01 | YCSkyvern Open Source AI Agent to automate browser workflows via an API · skyvern.com | still up |
| 2024-01-01 | YCego AI applied research lab building synthetic sapience; human-like AI · egoai.com | still up |
| 2022-01-29 | typing.ai | still up |
| 2023-06-01 | YCFiber AI The freshest data APIs for AI sales, recruiting, & growth products · fiber.ai | still up |
| 2023-06-01 | AI-powered insurance verification to boost patient conversion. · soharhealth.com | still up |
| 2024-06-01 | YCVideoGen Create professional videos in minutes with AI, online or via API · videogen.io | still up |
| 2023-11-14 | alignapi.com | still up |
| 2019-01-01 | YCCosmic Cosmic is an AI-powered headless CMS · cosmicjs.com | still up |
| 2025-09-01 | YCLapis AI that creates and runs ads, end-end · trylapis.com | still up |
| 2025-06-01 | YCTesora Frontier AI for Actuaries · tesora.ai | still up |
| 2023-10-12 | laketool.ai | still up |
| 2022-06-01 | YCCapix AI-powered private equity intelligence. · capix.ai | still up |
| 2026-06-01 | YCSpeko OpenRouter for Voice AI: one API, every call on the best speech model · speko.ai | still up |
| 2024-01-01 | YCPrecip High precision AI weather models · precip.ai | still up |
| 2023-06-01 | The API for LLM tool use · opentools.com | still up |
| 2025-01-01 | AI documentation engineer – test & autoimprove stale product docs · quantstruct.com | still up |
| 2023-06-01 | YCMinded Cursor for AI Agents · minded.com | still up |
| 2023-01-01 | YCMercoa AI Agent for Billpay platforms to pay invoices with virtual cards · mercoa.com | still up |
| 2022-06-01 | YCTypeLess AI messaging API for smarter, faster communication. · apps.apple.com | still up |
| 2026-01-01 | YCCaptain Self-tuning file search for AI agents · captain.dev | still up |
| 2024-06-01 | Turn any website into an API. · expand.ai | still up |
| 2022-01-01 | YCAndi AI Search for the Next Generation · andiai.com | still up |
| 2025-09-01 | YCThe Hog Real-time web intelligence API for AI agents and GTM teams · thehog.ai | still up |
| 2025-09-01 | API for parsing multimodal unstructured data · unsiloed.ai | still up |
| 2024-01-01 | AI media creation platform for creators and developers · magichour.ai | still up |
| 2026-06-01 | YCArchal API sandboxes, built for AI agents · archal.ai | still up |
| 2026-06-01 | We give AI agents realtime web context via API · context.dev | still up |
| 2026-06-01 | AI-native back-office for banks and fintechs · rapidfolio.com | still up |
| 2019-06-01 | AI platform accelerating therapies for rare & inflammatory diseases. · gen1e.com | still up |
How this compares
Y Combinator reports its own outcomes, including acquisitions. The other two are judged by asking the domain, so they are not measured the same way and are never averaged together.
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.