You asked about API
443 people built something like it. 68 are gone.
That is 17% of the ones whose fate we could settle, against 23% across the whole register. 39 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2017-06-01 | YCTruepill API-connected healthcare infrastructure. · truepill.com | acquired |
| 2014-01-01 | YCAlgolia A developer-friendly and enterprise-grade search API. · algolia.com | still up |
| 2014-06-01 | YCCheckr People infrastructure for the future of work · checkr.com | still up |
| 2023-02-01 | trigger.dev | still up |
| 2012-06-01 | YCZapier The easiest way to automate your work. · zapier.com | still up |
| 2011-06-01 | YCSegment Software and APIs to collect, clean, and control customer data. · segment.com | acquired |
| 2022-01-01 | Data driven neobank for SMBs in LATAM · kapital.mx | still up |
| 2016-06-01 | YCBird The world’s largest omnichannel communications platform · bird.com | still up |
| 2021-09-12 | open-meteo.com | still up |
| 2022-03-20 | theneo.io | still up |
| 2022-11-22 | apyhub.com | still up |
| 2022-01-10 | databar.ai | still up |
| 2022-01-09 | movieofthenight.com | unverified |
| 2022-06-02 | getapimaker.com | gone |
| 2021-09-22 | motion.dev | still up |
| 2023-01-25 | automatisch.io | still up |
| 2022-05-19 | apitracker.io | still up |
| 2022-07-10 | apislist.com | still up |
| 2022-02-24 | vcstack.io | gone |
| 2022-08-23 | crawlee.dev | still up |
| 2015-06-01 | Digital trade finance and B2B commerce company · dripcapital.com | still up |
| 2022-12-27 | HNDog API dogapi.dog | still up |
| 2022-07-30 | saasnapkin.com | gone |
| 2022-03-15 | vessel.land | unverified |
| 2021-02-06 | epub.to | still up |
| 2023-02-28 | crul.com | still up |
| 2022-10-05 | beaglesecurity.com | still up |
| 2022-10-25 | wundergraph.com | still up |
| 2022-04-27 | directus.io | moved |
| 2021-02-06 | libretranslate.com | still up |
| 2023-02-10 | mrscraper.com | still up |
| 2022-10-12 | rye.com | still up |
| 2022-02-16 | rutter.com | still up |
| 2023-02-07 | nango.dev | still up |
| 2022-03-03 | treblle.com | still up |
| 2016-01-01 | Protects organizations from getting breached through their APIs. · salt.security | still up |
| 2022-02-15 | answers.netlify.com | unverified |
| 2022-10-04 | capital.xyz | still up |
| 2022-08-04 | superblocks.com | still up |
| 2022-06-17 | liveapi.com | still up |
| 2022-02-10 | emailkick.com | still up |
| 2022-02-02 | climatiq.io | still up |
| 2023-03-09 | apirank.dev | still up |
| 2023-02-28 | briefsky.app | still up |
| 2019-01-01 | YCVerto Cross-Border Payments and FX Simplified · vertofx.com | still up |
| 2022-05-06 | kaedim3d.com | still up |
| 2022-04-19 | meta-api.io | unverified |
| 2022-06-16 | console.connect.earth | still up |
| 2022-07-30 | albato.com | still up |
| 2022-03-13 | filedoge.com | unverified |
| 2022-02-24 | api-diff.io | still up |
| 2018-06-01 | Payment operations tools for money movement. · moderntreasury.com | still up |
| 2022-04-05 | merge.dev | still up |
| 2021-05-12 | csvbox.io | still up |
| 2014-01-01 | YCAxoni Axoni is building the next generation of capital markets technology · axoni.com | acquired |
| 2019-01-01 | YCAlpaca API-first stock and crypto brokerage platform · alpaca.markets | still up |
| 2011-01-01 | YCDrChrono The essential platform for modern medical practices and patients. · drchrono.com | acquired |
| 2021-01-01 | YCGigs The OS for Embedded Telecom · gigs.com | still up |
| 2022-01-10 | speechly.com | moved |
| 2022-03-14 | hilos.io | 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.
Older launches have had longer to die, so this slope is expected. A year that broke it would mean something is wrong with the checking.
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.