You asked about B2B
14 people built something like it. 4 are gone.
That is 31% of the ones whose fate we could settle, against 23% across the whole register. 1 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2022-01-01 | Identity Verification API for Emerging Markets · prembly.com | still up |
| 2022-01-01 | YCTheneo Stripe-like API Docs in just a few clicks · theneo.io | still up |
| 2022-06-01 | YCKombo Unified API for HR, payroll and recruiting software · kombo.dev | still up |
| 2022-01-01 | YCVelt SDK for adding an agent and human governance layer to your product · velt.dev | still up |
| 2022-06-01 | YCInvofox Invofox is the document parsing and data extraction API for software… · invofox.com | still up |
| 2022-01-01 | YCSpeechly Natural Language Understanding API for Speech that runs on device · speechly.com | acquired |
| 2022-06-01 | The Unified API for Business Financial Data · integrationlabs.co | gone |
| 2022-06-01 | API for Retrieval Augmented Generation · superpowered.ai | gone |
| 2022-01-01 | API for shared embeddable web browsers · hyperbeam.com | still up |
| 2022-06-01 | The API to search, scrape, and interact with the web at scale. 🔥 · firecrawl.dev | still up |
| 2022-01-01 | Open-source API & UI test automation · karatelabs.io | still up |
| 2022-06-01 | YCTypeLess AI messaging API for smarter, faster communication. · apps.apple.com | still up |
| 2022-01-01 | YCSendo The best SMS/RCS API for startups · sendo.dev | gone |
| 2022-01-01 | YCKable Usage-based billing for API companies · kable.io | gone |
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.