You asked about API
Nobody in the register described anything this way.
| Launched | What it was | Today |
|---|---|---|
| 2017-06-01 | YCTruepill API-connected healthcare infrastructure. · truepill.com | acquired |
| 2011-06-01 | YCSegment Software and APIs to collect, clean, and control customer data. · segment.com | acquired |
| 2014-01-01 | YCAxoni Axoni is building the next generation of capital markets technology · axoni.com | acquired |
| 2011-01-01 | YCDrChrono The essential platform for modern medical practices and patients. · drchrono.com | acquired |
| 2017-06-01 | Health enterprise API for data on doctors, insurance, costs, & quality · ribbonhealth.com | acquired |
| 2011-01-01 | YCMailgun Email API service. · mailgun.net | acquired |
| 2021-01-01 | YCDyte Real-time audio & video SDKs, ready to launch 🚀 · dyte.io | acquired |
| 2023-01-01 | YCPlayAI Our mission is to make Voice AI accessible and useful to all. · play.ai | acquired |
| 2014-06-01 | API platform for partners to issue branded debit and credit cards to… · aptopayments.com | acquired |
| 2021-01-01 | YCFinley Streamline your debt capital raise and management · finleycms.com | acquired |
| 2015-01-01 | YCMoltin eCommerce building blocks through simple APIs for websites & apps.… · moltin.com | acquired |
| 2023-01-01 | YCFern Instantly offer SDKs and API Docs · buildwithfern.com | acquired |
| 2022-06-01 | YCAlterya Protecting Humans from Scams · alterya.dev | acquired |
| 2022-01-01 | Open-Source Postman alternative · requestly.com | acquired |
| 2023-01-01 | YCVersori Agentic integrations & automations for enterprise · versori.com | acquired |
| 2014-01-01 | Create APIs where they don't exist. With kimono you can quickly… · kimonolabs.com | acquired |
| 2010-01-01 | YCZencoder Video Encoding API,
Open source video player (video.js) · zencoder.com | acquired |
| 2014-01-01 | YCRickshaw Same day local delivery, via API. Currently operating in SF. · gorickshaw.com | acquired |
| 2014-01-01 | YCWit.ai Natural Language for Developers --Wit is an API that makes it easy… · wit.ai | acquired |
| 2022-01-01 | YCSpeechly Natural Language Understanding API for Speech that runs on device · speechly.com | acquired |
| 2020-01-01 | YCWeav Weav is the universal API for commerce platforms · weav.co | acquired |
| 2024-01-01 | YCTrieve All-in-one API for search, RAG, & recommendations · trieve.ai | acquired |
| 2023-01-01 | Usage Metering, AI & API Monetization · openmeter.io | acquired |
| 2022-01-01 | YCDecent Cross-chain routing + trading APIs. One-click transactions with any… · decent.xyz | acquired |
| 2023-01-01 | YCEzDubs Real-time speech translation · ezdubs.ai | acquired |
| 2018-06-01 | YCOptic Making APIs Developer-friendly · useoptic.com | acquired |
| 2023-01-01 | YCTrigo Rent verification API for landlords and lenders · trigodata.com | acquired |
| 2022-06-01 | YCVizzly Customer-Facing Analytics for Modern SaaS. · vizzly.co | acquired |
| 2023-06-01 | YCGlide Crypto Deposits, Wallet Funding, and Pay-with-crypto Infra · buildwithglide.com | acquired |
| 2022-06-01 | YCPayload Developer-First Headless CMS and Application Framework · payloadcms.com | acquired |
| 2019-01-01 | Trade finance company for Indian exporters · seawisecapital.com | acquired |
| 2021-06-01 | YCWarrant Authorization and access control as a service. · warrant.dev | acquired |
| 2017-01-01 | The Universal API · scaphold.io | acquired |
| 2018-01-01 | Dental Insurance API · onederful.co | acquired |
| 2018-06-01 | YCOneGraph GraphQL API to connect all of the internet's APIs. Join us at Netlify! · onegraph.com | acquired |
| 2017-06-01 | Natural language processing APIs for developers. · plasticity.ai | acquired |
| 2012-01-01 | YCSlidePay Banking and Payment Platform APIs. Exited October 2014. · angel.co | acquired |
| 2018-01-01 | YCNewCraft Universal API for HR & Payroll · newcraft.io | acquired |
| 2013-06-01 | Banking APIs; acquired by Silicon Valley Bank in August 2015 · standardtreasury.com | acquired |
How this compares
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.