CurlHub gives developers a no-install request bin URL to inspect API and webhook traffic. See its features, free tier limits, and how it works.
Category
Developer Tools
Pricing
Freemium: a free tier covering a set monthly request allowance, plus paid tiers or sponsorship for higher usage and to support development, from Free for up to 10,000 requests per month; paid tiers available for higher volume, exact pricing not publicly listed in a fixed table
Verified
Not yet
Last updated
July 19, 2026
Founded
2018
Headquarters
Minneapolis-Saint Paul (Twin Cities), Minnesota, United States
What CurlHub is
CurlHub gives developers a unique request bin URL that captures and displays incoming HTTP or API traffic in real time, without requiring any local software installation. It was created in 2018 by independent developer Christopher (cdeutsch on GitHub) specifically to replace Runscope's discontinued Traffic Inspector feature.
The tool is maintained as an independent, single-developer project rather than a venture-backed company, with its code hosted publicly under the CurlHub organization on GitHub.
How developers use CurlHub
A typical workflow involves requesting a unique bin URL, pointing an API client, webhook configuration, or curl command at that URL, and then reviewing the captured request headers, payload, and metadata inside CurlHub's interface.
This makes it particularly useful for debugging outbound webhooks, verifying what a client actually sends before hitting a production endpoint, and teaching the fundamentals of HTTP requests.
Pricing and project sustainability
CurlHub offers a free tier covering 10,000 requests per month, with paid tiers or sponsorship options available for developers who need higher volume or want to support ongoing development.
Because it is run by a single independent maintainer rather than a company, it lacks the enterprise support structure of larger API tooling vendors, which buyers should factor into any long-term reliance on the service.
Key Features
Unique request bin URL — Generates a dedicated URL that captures any HTTP or API request sent to it.
Real-time traffic inspection — Displays incoming request headers, payloads, and metadata as they arrive.
No installation required — Runs entirely in the browser with no local software or configuration needed.
Works with curl and any HTTP client — Compatible with curl commands as well as any tool or service capable of making an HTTP request.
Generous free tier — Includes up to 10,000 requests per month at no cost.
Request history and log viewer — Lets developers review previously captured requests for a given bin.
Open development on GitHub — Project code and updates are maintained publicly under the CurlHub GitHub organization.
Sponsorship-supported development — Accepts sponsorships alongside paid subscriptions to fund ongoing maintenance.
Pros & Cons
Pros
Quick setup with no local installation required
Generous free tier covering 10,000 requests per month
Simple, focused feature set that is easy to learn immediately
Actively maintained by its original independent developer
Useful for debugging webhooks and API calls in real time
Cons
Single-maintainer project carries more continuity risk than a funded company
Feature set is narrower than full API platforms like Postman
Limited public documentation on advanced usage
No dedicated enterprise support tier or formal SLA
Lower brand recognition compared to larger API testing competitors
Pricing
Free 0 USD monthly
Paid / Supporter Not publicly disclosed monthly
Frequently Asked Questions
What is CurlHub
CurlHub is a web tool that provides a unique request bin URL for capturing and inspecting HTTP and API traffic without installing any software.
Who created CurlHub
CurlHub was created in 2018 by independent developer Christopher, known as cdeutsch on GitHub, based in Minnesota.
Is CurlHub free
Yes, CurlHub offers a free tier covering up to 10,000 requests per month, with paid tiers available for higher usage.
What is a request bin
A request bin is a unique URL that captures any HTTP request sent to it so a developer can inspect the headers, payload, and metadata.
Why was CurlHub created
It was built to replace Runscope's Traffic Inspector feature after that tool was discontinued.
Can CurlHub be used for webhook testing
Yes, pointing a webhook configuration at a CurlHub bin URL is one of its primary use cases for debugging outbound webhook payloads.
Is CurlHub open source
The project's code is hosted publicly on GitHub under the CurlHub organization.
What are alternatives to CurlHub
Similar request inspection and API testing tools include RequestBin-style services, ReqBin, and broader API platforms like Postman.