Web development services
Services to add to your website to validate data, add features etc
APIs for web developers: error tracking, uptime and broken-link monitoring, on-call alerts, forms and code hosting, plus hosting, testing, validation, security, SEO and URL shorteners in the subcategories.
Blogs and publishing
Publish posts, read blog platforms and tell search engines about new pages
8
Data validators
Validates data of different types
5
Hosting and storage
Servers, file storage and file uploads in the cloud
10
Security related services
Encryption and coding services
5
SEO and site checks
Speed, search ranking and archive checks for websites
6
Testing and mock data
Test HTTP clients and fill your app with fake sample data
4
URL shorteners
Make short links and count their clicks
Datacircle API
The Datacircle API compares the pricing plans of go-to-market (GTM) data APIs, such as email finders, email verification, phone lookup, company and person enrichment and LinkedIn data, with a score for price, accuracy and speed, ...
GitHub REST API
The GitHub REST API gives access to repositories, issues, pull requests, releases, commits, users, organisations, gists and more on GitHub. Read public data without authentication, or use a token to manage your own repositories ...
HQAPI
HQAPI offers fast, secure, and reliable APIs built for developers, engineers, analysts, designers, and teams of all sizes. With over 250 million requests served, HQAPI delivers proven performance with a 99.95% uptime guarantee ...
jsDelivr Data API
The jsDelivr Data API gives information about packages served by the jsDelivr CDN from npm and GitHub: available versions, file lists with hashes, the default entry file and download statistics. Use it to find the latest version ...
NoMore404
NoMore404 monitors websites, APIs, DNS, TCP ports and ping, and confirms every failure from locations on different continents before it alerts anyone, so one bad network minute does not wake you up. Alerts go by e-mail and ...
PagerDuty
PagerDuty handles incident response and on-call scheduling. Monitoring tools send alerts to PagerDuty through its Events API or one of more than 750 integrations, and PagerDuty notifies the person who is on call by app, SMS, ...
Sentry
Sentry tracks errors and performance problems in websites, apps and servers. Add a Sentry SDK (available for JavaScript, PHP, Python, Java, Go, iOS, Android and many more) and every crash or exception is reported with its stack ...
SoldFetch
eBay sold-listing data API and MCP server for AI agents. Call the REST API (JSON) or connect an MCP client to search eBay sold and active listings, browse categories and look up items on ebay.com, ebay.co.uk and ebay.de. Free ...
StatusCake
StatusCake monitors websites and servers: uptime checks from locations around the world, page speed, SSL certificate expiry and domain expiry, with alerts by e-mail and through integrations such as Slack. Monitors can also be ...
Wufoo Form Builder API
The Wufoo REST API lets you work with the data from your Wufoo online forms: read forms, fields, entries, reports and users, and submit new entries from your own software. Webhooks can notify your server whenever someone submits ...
Compare the web development APIs
| Service | API key | Formats | Free use |
|---|---|---|---|
| Datacircle API | Not needed | JSON | Free, no key needed, at up to 60 calls a minute from one IP address. |
| GitHub REST API | Not needed | JSON | Free; unauthenticated requests are limited to 60 per hour, a free personal access token raises that to 5,000. |
| HQAPI | Needed, free | JSON | – |
| jsDelivr Data API | Not needed | JSON | Free, no key needed; contact jsDelivr before sending more than about 100 requests per minute for long periods. |
| NoMore404 | Needed, free | JSON | Free plan with five monitors checked every five minutes, as long as you sign in at least once every six months; paid plans from 9 euro per month add more monitors and checks. |
| PagerDuty | Needed, free | JSON | Free plan for up to 5 users with one on-call schedule and 100 SMS or phone notifications per month; paid plans for larger teams. |
| Sentry | Needed, free | JSON | – |
| SoldFetch | Needed, free | JSON | Free plan: 100 free units, no card required; paid plans from $9/month. |
| StatusCake | Needed, free | JSON | Free plan with 10 uptime monitors checked every 5 minutes, plus one page speed, one SSL and one domain monitor; paid plans for faster checks and more monitors. |
| Wufoo Form Builder API | Needed, free | JSON, XML | Free with a Wufoo account; the limits depend on your Wufoo plan. |
Questions
Which free web development APIs work without an API key?
Datacircle API, GitHub REST API and jsDelivr Data API work without a key, according to their documentation. Most keyless services ask you to keep the number of requests reasonable, and some ask for a User-Agent that names your app.
Are these web development APIs really free?
The services here can be used without paying, at least on a free plan or free tier, often with limits such as a number of requests per day or non-commercial use only. The table above quotes what each service says about its free use; check the provider's own terms before you rely on it.
How up to date is this list?
The address of every service is checked about once a week, and services that stop working or stop being free are removed. This list last changed on November 12th, 2026.