You asked about APIs
48 people built something like it. 0 are gone.
That is 0% of the ones whose fate we could settle, against 23% across the whole register.
| Launched | What it was | Today |
|---|---|---|
| 2022-05-19 | apitracker.io | still up |
| 2022-07-10 | apislist.com | still up |
| 2022-10-05 | beaglesecurity.com | still up |
| 2022-10-25 | wundergraph.com | still up |
| 2022-02-16 | rutter.com | still up |
| 2023-02-07 | nango.dev | still up |
| 2016-01-01 | Protects organizations from getting breached through their APIs. · salt.security | still up |
| 2022-08-04 | superblocks.com | still up |
| 2023-03-09 | apirank.dev | still up |
| 2023-02-28 | briefsky.app | still up |
| 2021-06-06 | prestigemad.com | still up |
| 2021-01-15 | forgojs.org | still up |
| 2021-06-09 | airy.co | still up |
| 2021-03-27 | stackby.com | still up |
| 2021-08-24 | slashapi.com | still up |
| 2021-06-01 | YCExa Web search rebuilt for LLMs · exa.ai | still up |
| 2021-01-01 | YCMindee AI Document Understanding API · mindee.com | still up |
| 2021-01-02 | compiledcssinjs.com | still up |
| 2023-08-14 | chatwith.tools | still up |
| 2022-10-19 | docs.stigg.io | still up |
| 2024-09-01 | Real-time B2B data via simple APIs · crustdata.com | still up |
| 2023-01-19 | databar.ai | still up |
| 2022-11-04 | veeplay.com | still up |
| 2022-01-01 | Healthcare Price Transparency APIs and Data Products · serifhealth.com | still up |
| 2024-01-01 | YCMiden Card issuer processor and banking stack for businesses in Sub-… · miden.co | still up |
| 2023-09-14 | eesel.ai | still up |
| 2022-02-14 | jeremiewenger.com | still up |
| 2021-02-19 | kreya.app | still up |
| 2023-06-01 | YCFiber AI The freshest data APIs for AI sales, recruiting, & growth products · fiber.ai | still up |
| 2021-04-27 | wundergraph.com | still up |
| 2018-06-01 | Developer-friendly and enterprise-grade APIs for financial market… · alphavantage.co | still up |
| 2020-01-01 | YCFlowglad Analyze, act, and automate across systems · flowglad.com | still up |
| 2021-07-15 | stytch.com | still up |
| 2023-03-20 | micro.dev | still up |
| 2023-02-08 | schappi.com | still up |
| 2022-01-01 | Customer support tool purpose-built for companies that sell APIs · fogbender.com | still up |
| 2024-01-01 | YCInteguru Generate fast, reliable APIs for any platform · integuru.com | still up |
| 2022-02-28 | blog.frankel.ch | still up |
| 2025-09-01 | YCLapis AI that creates and runs ads, end-end · trylapis.com | still up |
| 2026-01-01 | YCZatanna Turning all software into agent-first APIs · zatanna.ai | still up |
| 2023-01-01 | YCSuperAPI Programmable API gateway that makes APIs cacheable · trysuperapi.com | still up |
| 2026-06-01 | APIs for robotics data teams to verify data quality for model training · hebbianrobotics.com | still up |
| 2025-09-01 | API for parsing multimodal unstructured data · unsiloed.ai | still up |
| 2026-01-01 | Agentic Payments for APIs · orthogonal.com | still up |
| 2024-09-01 | Empowering Physical Therapists to Go Independent · joinhealthspark.com | still up |
| 2026-06-01 | We give AI agents realtime web context via API · context.dev | still up |
| 2021-01-01 | YCWaypoint The email API built for product teams · usewaypoint.com | still up |
| 2012-06-01 | YCEligible Insurance Billing APIs for Healthcare Businesses · eligible.com | 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.
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.