You asked about API
23 people built something like it. 2 are gone.
That is 9% of the ones whose fate we could settle, against 23% across the whole register. 1 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2024-09-01 | Real-time B2B data via simple APIs · crustdata.com | still up |
| 2024-01-01 | YCMiden Card issuer processor and banking stack for businesses in Sub-… · miden.co | still up |
| 2024-06-01 | YCOway Turning America’s supply chain inefficiency into infrastructure. · shipoway.com | still up |
| 2024-09-01 | The legal back-office for European founders - the incorporation API… · beglaubigt.de | still up |
| 2024-06-01 | Capitol: the sovereign operating system for intelligence. · capitol.ai | still up |
| 2024-01-01 | YCego AI applied research lab building synthetic sapience; human-like AI · egoai.com | still up |
| 2024-01-01 | YCTrieve All-in-one API for search, RAG, & recommendations · trieve.ai | acquired |
| 2024-09-01 | YCAbundant Agent simulation and RL for researchers · abundant.ai | still up |
| 2024-06-01 | YCVideoGen Create professional videos in minutes with AI, online or via API · videogen.io | still up |
| 2024-06-01 | YCScape The intelligent inbox that works for you · scape.app | still up |
| 2024-01-01 | YCInteguru Generate fast, reliable APIs for any platform · integuru.com | still up |
| 2024-01-01 | YCTesseral The open source platform for managing identity in business software · tesseral.com | gone |
| 2024-01-01 | API For PDF Document Workflows · fileforge.com | gone |
| 2024-09-01 | YCSurge Stripe for telephony · surge.app | still up |
| 2024-01-01 | YCPrecip High precision AI weather models · precip.ai | still up |
| 2024-06-01 | YCPinnacle API & SDK for RCS (the next-generation of texting) · pinnacle.sh | still up |
| 2024-06-01 | Turn any website into an API. · expand.ai | still up |
| 2024-01-01 | YCLeaping Automate bug resolution · leaping.io | still up |
| 2024-01-01 | AI media creation platform for creators and developers · magichour.ai | still up |
| 2024-09-01 | YCVespper The best DOCX MCP for agents to edit microsoft word documents · vespper.com | still up |
| 2024-06-01 | YCPanora Turning messy inboxes into ERP-Ready Data · getpanora.com | still up |
| 2024-09-01 | Empowering Physical Therapists to Go Independent · joinhealthspark.com | still up |
| 2024-01-01 | YCDownlink Make your LLMs 3x faster. · downlink.dev | still up |
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.