You asked about API
70 people built something like it. 70 are gone.
That is 100% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2022-06-02 | getapimaker.com | gone |
| 2022-02-24 | vcstack.io | gone |
| 2023-07-02 | bigcapital.ly | gone |
| 2023-03-28 | airwalker.io | gone |
| 2023-11-28 | app.multiple.dev | gone |
| 2023-03-05 | chatgptbay.com | gone |
| 2023-03-08 | searq.org | gone |
| 2018-01-01 | Engineering next-generation, brain-penetrant cancer therapies. · reverielabs.com | gone |
| 2023-02-03 | leapml.dev | gone |
| 2021-10-21 | start.scaffold.ly | gone |
| 2022-01-01 | Working capital for Brazilian restaurants · pantorepay.com.br | gone |
| 2019-01-01 | Precision-first therapies · endpointhealth.com | gone |
| 2023-03-03 | practiceinterview.co | gone |
| 2023-03-30 | meteosource.com | gone |
| 2022-01-20 | nasa-apod.portaldocs.dev | gone |
| 2021-11-15 | os.cohere.ai | gone |
| 2023-02-14 | openapi.security | gone |
| 2023-02-07 | oneapikey.com | gone |
| 2022-01-01 | YCWingback Wingback provides tools and APIs for SaaS pricing and packaging. · wingback.com | gone |
| 2021-01-01 | YCMystic Low latency API to run and deploy ML models · mystic.ai | gone |
| 2016-01-01 | YCElucify Elucify is an API that plugs into your CRM which automatically cleans… · getelucify.com | gone |
| 2022-06-01 | The Unified API for Business Financial Data · integrationlabs.co | gone |
| 2023-09-03 | apimydata.dev | gone |
| 2021-10-27 | rodb.io | gone |
| 2021-05-14 | series.slice.so | gone |
| 2021-03-06 | hosty.page | gone |
| 2021-02-14 | mathequationapi.com | gone~13mo |
| 2021-01-01 | YCNoya Radically reducing capital costs and build time for direct air capture · noya.co | gone |
| 2019-01-01 | YCFuse Unified API for financial data aggregators. · letsfuse.com | gone |
| 2022-02-12 | rapidmock.com | gone |
| 2023-01-12 | sheethub.io | gone |
| 2022-03-16 | plaraphy.com | gone |
| 2022-11-26 | getquickbase.com | gone |
| 2021-06-09 | trytoolchest.com | gone |
| 2022-05-19 | locode.dev | gone |
| 2020-01-01 | We’re creating programmable therapies · felixbt.com | gone |
| 2017-06-01 | Rapid, scalable diagnostic for SARS-CoV-2 and beyond · predxionbio.com | gone |
| 2018-06-01 | YCXkit Universal CRM integration for B2B SaaS apps · xkit.co | gone |
| 2020-01-01 | YCEnveloop Design and send messages from your app with a simple API. · enveloop.com | gone |
| 2022-01-01 | YCPelm Plaid for utilities · pelm.com | gone |
| 2018-01-01 | Point stores things you send over and over again and helps you re-use… · pointapi.com | gone |
| 2022-01-01 | YCVessel Developer-first, native integration platform for GTM tools · vessel.dev | gone |
| 2023-09-10 | docs.neutrinolabs.dev | gone |
| 2023-12-14 | ratelimitapi.com | gone |
| 2023-06-06 | tryabide.co | gone |
| 2022-08-09 | ecom2json.com | gone |
| 2024-01-01 | YCTesseral The open source platform for managing identity in business software · tesseral.com | gone |
| 2022-06-01 | Card issuer for Africa · bridgecard.cards | gone |
| 2022-05-06 | youonlygetanapi.com | gone |
| 2022-04-16 | hn.hsblhsn.me | gone |
| 2021-09-08 | mockachino.com | gone |
| 2023-07-14 | pingquick.dev | gone |
| 2023-06-01 | YCSmobi Send texts your customers actually want over RCS · smobi.com | gone |
| 2021-01-01 | YCPensil New-Age White Label Community Platform SDKs and APIs for Games,… · pensil.in | gone |
| 2022-06-01 | API for Retrieval Augmented Generation · superpowered.ai | gone |
| 2019-06-01 | Turn any website into an API · dashblock.com | gone |
| 2021-06-01 | Zapier for billing · hyperseed.com | gone |
| 2022-01-01 | YCValari Embedded finance platform for LatAm. · valari.co | gone |
| 2024-01-01 | API For PDF Document Workflows · fileforge.com | gone |
| 2019-01-01 | YCBasilica Basilica is an API that embeds high-dimensional data like images and… · basilica.ai | gone |
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.