API Portfolio — 5 Free APIs

What it does

5 production APIs for developers who need data without expensive subscriptions: Domain WHOIS via RDAP, Company Info from Wikipedia + Wikidata, Email Validator with MX + SMTP, IP Geolocation with dual-source fallback, and Sanctions Screener with 20K+ OFAC + UN entities. Built with Cursor AI, no coding skills required. Free tier: 100 requests/month, no credit card. All open source on GitHub.

Domain WHOIS, Company Info, Email Validator, IP Geolocation, and Sanctions Screener — all free, live on RapidAPI. Built with Cursor AI, no coding skills required.

5 free APIs for developers. Domain WHOIS, Company Info, Email Validator, IP Geolocation, and Sanctions Screener. Built with Cursor AI, no coding skills required. Registration data for any domain via RDAP protocol. Returns registrar, dates, status, nameservers. Company profiles from Wikipedia + Wikidata. Description, industry, founded, HQ, employees, revenue, ticker. 3-stage verification: RFC 5322 syntax, DNS MX lookup, optional SMTP mailbox check. Country, city, lat/lon, timezone, ISP, ASN for any IP. Dual-source fallback for reliability. Screen names against OFAC SDN (19,000+ entities) and UN Consolidated (1,000+ entities). Match scoring, AKA alias matching. Built with Cursor IDE. No…from on13uka.github.io

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  Context.devJul 2026 · context.dev · ▲814

  Hello, My name is Yahia, I've been working on scraping products for a long time and maintain a couple of free sites in my spare time (E.g. knifegeek.io) What prompted this is i've rebuilt scraping infra at every company I've started and finally just made it a product. Pass a URL, get clean markdown, html, images, sitemap or pass a domain, get logos, colors, socials, industry data. Goal is to offer a better service than VC funded competitors at a fraction of the cost. Stealth is included and automatic at no additional cost (normally an upcharge by alternatives). Would love your honest thoughts.

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  Abstract APIs2020 · abstractapi.com · ▲341

  Simple, powerful APIs for everyday dev tasks

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  API PickFeb 2026 · apipick.com · ▲71

  Data APIs for AI agents & developers — free to start

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  Domain WHOIS APIAug 2026 · rapidapi.com · ▲3

  Free domain lookup — RDAP, no API key needed

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  Whois³2022 · ▲80

  Know about everyone in web3

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  Free IP API2023 · freeipapi.com · ▲83

  Free, Fast and Reliable IP Geolocation, Countries, Timezones and Phone codes API for commercial and non-commercial usage, Available in JSON and XML formats.

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  /dev/null▲481

  a social network for devs

  Dev tools · 2d ago · dev-null.sh

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  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 27d ago · github.com

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  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

  Dev tools · 25d ago · github.com

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  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 22d ago · openbot.run

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  Talanoa▲341

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 20d ago · talanoa.email

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  CoreSpeed▲332

  One MCP for everything your agents need: apps, memory, tools

  Dev tools · 27d ago · corespeed.io

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  I replaced a $120k bowling center system with $1,600 in ESP32s▲2,935

  I might be the only SRE on Earth with his own bowling center. It's a more in-depth gig than you'd think. My family and I bought an abandoned 8-lane bowling center in the rural mid-west. In our small town there weren't many recreation options for families. You've heard of a food desert? This is an R&R desert. It had been abandoned for a good reason. The roof leaks, the electrical system was constantly surging, and my 70-year-old bowling equipment (still) doesn't work perfectly. The system that keeps your score is particularly interesting to me. It's the thing you watch during your game, but…

  Life & fun · Jul 2026

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  Elevators▲1,680

  How elevators push your buttons

  Life & fun · Jul 2026 · john.fun

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  18 Words▲1,160

  Play 18 Words, the free daily word puzzle. The official home is 18words.com. Tap Play now to open today

  Life & fun · Jul 2026 · 18words.com

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  Bento - An entire PowerPoint in one HTML file (edit+view+data+collab)▲1,033

  Over the past few months, our team has been building more and more slidedecks using web frontend technologies with coding harnesses like Claude Code, but a common complaint is to make even small edits we need to edit the code either manually or via the harness. To avoid this loop, I ended up creating Bento, a single HTML file with everything you need in a slide tool including animations and shared editing. There's no install or cloud login, everything works offline. The default deck is around 560 KB and it doesn't need to fetch anything once you got it. Open it in a browser and then you can…

  Dev tools · Jul 2026 · bento.page

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  Getting GLM 5.2 running on my slow computer▲937

  A few days ago I found myself trying out GLM 5.2 and was really positively impressed. The capabilities and security I was getting from this LLM are similar to those I've gotten from models like Claude or GPT, and this really surprised me. But then I thought, "I wonder how it would work on a normal computer like mine," and above all, "I wonder if it would work without going into OOM on a computer like mine." So I started working with the help of agents to test this possibility. I started converting the model to int4, understanding MTP usage, and if possible implementing DSA for long context.…

  AI · Jul 2026 · github.com

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  OpenSEO▲928

  Hello! For the last 2 months, I've been building OpenSEO. It's a user friendly UI wrapping the DataForSEO API which has high quality SEO data for keywords, backlinks, AI SEO and competitor research. Instead of paying $100+ per month, you buy DataForSEO credits and pay only for usage. The coolest thing about the project so far has been hearing about what people are building on top of it. People are using coding agents to quickly integrate with Google Search Console, Google Ads and building their own AI SEO and reporting features. Many were already building their own custom solutions around…

  Dev tools · Jul 2026 · openseo.so