You asked about API
33 people built something like it. 2 are gone.
That is 8% of the ones whose fate we could settle, against 23% across the whole register. 7 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2023-06-01 | Helping businesses in emerging markets make pay their international… · capimoney.com | still up |
| 2023-01-01 | YCPlayAI Our mission is to make Voice AI accessible and useful to all. · play.ai | acquired |
| 2023-01-01 | YCFern Instantly offer SDKs and API Docs · buildwithfern.com | acquired |
| 2023-01-01 | YCEscape Offensive security for the teams that are 100x outnumbered · escape.tech | still up |
| 2023-01-01 | YCMetal The AI context platform for private capital. Everything your firm… · metal.ai | still up |
| 2023-06-01 | YCTerminal Plaid for Telematics Data in Commercial Trucking · withterminal.com | still up |
| 2023-01-01 | YCVersori Agentic integrations & automations for enterprise · versori.com | acquired |
| 2023-01-01 | YCScanbase The API for Diagnostic Test Analysis (COVID-19, FLU, RSV, STD,… · scanbase.com | still up |
| 2023-01-01 | YCLiteLLM Call every LLM API like it's OpenAI [100+ LLMs] · litellm.ai | still up |
| 2023-06-01 | YCSkyvern Open Source AI Agent to automate browser workflows via an API · skyvern.com | still up |
| 2023-06-01 | YCFiber AI The freshest data APIs for AI sales, recruiting, & growth products · fiber.ai | still up |
| 2023-06-01 | AI-powered insurance verification to boost patient conversion. · soharhealth.com | still up |
| 2023-01-01 | YCFastgen Webflow for the Backend · fastgen.com | still up |
| 2023-01-01 | Usage Metering, AI & API Monetization · openmeter.io | acquired |
| 2023-01-01 | YCNango A single API for all your integrations · nango.dev | still up |
| 2023-01-01 | YCEzDubs Real-time speech translation · ezdubs.ai | acquired |
| 2023-01-01 | YCPropexo Plaid for Commercial Real Estate · propexo.com | still up |
| 2023-01-01 | Unifying how the optical industry does business. · speccheckrx.com | still up |
| 2023-01-01 | YCTrigo Rent verification API for landlords and lenders · trigodata.com | acquired |
| 2023-06-01 | YCSmobi Send texts your customers actually want over RCS · smobi.com | still up |
| 2023-06-01 | YCGlide Crypto Deposits, Wallet Funding, and Pay-with-crypto Infra · buildwithglide.com | acquired |
| 2023-06-01 | YCMorph Fast Models Optimized for Coding Agents · morphllm.com | still up |
| 2023-06-01 | The API for LLM tool use · opentools.com | still up |
| 2023-01-01 | YCSuperAPI Programmable API gateway that makes APIs cacheable · trysuperapi.com | still up |
| 2023-06-01 | YCInconvo Build chat-with-data agents for customer-facing applications · inconvo.com | still up |
| 2023-06-01 | YCRecipeUI The open source Postman alternative. · recipeui.com | still up |
| 2023-01-01 | YCPoplarML Deploy Machine Learning Models with One Command · poplarml.com | still up |
| 2023-01-01 | YCMogara Automatic software R&D capitalization · mogara.com | gone |
| 2023-01-01 | YCCakework API that adds cloud hosting to any developer platform · cakework.com | gone |
| 2023-06-01 | YCMinded Cursor for AI Agents · minded.com | still up |
| 2023-01-01 | YCMercoa AI Agent for Billpay platforms to pay invoices with virtual cards · mercoa.com | still up |
| 2023-06-01 | Specialized agents for real work · opensteer.com | still up |
| 2023-01-01 | YCLaminate uselaminate.com | 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.