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URL Reference Resolver (RFC 3986)
x402
URL Reference Resolver (RFC 3986) is a paid API for AI agents from url.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Resolves a relative or absolute URL reference against an absolute base URL following RFC 3986 semantics
Price / call$0.002
Success—
StatusUnknown
How this service works
Resolve a relative or absolute reference against a base URL, following RFC 3986 reference resolution (e.g. base 'https://a.com/x/y' + ref '../z' → 'https://a.com/z'). The base must itself be a valid absolute URL, else a clean 400.
Output
Returns the fully resolved absolute URL string computed by applying RFC 3986 reference resolution rules to the given base and reference. If the base is not a valid absolute URL, the endpoint returns a 400 error with a descriptive message.
Example use cases
Resolving scraped relative hrefs
“I scraped a bunch of anchor tags from 'https://docs.example.com/api/v2/' and they have relative hrefs like '../guides/quickstart'. Can you resolve each one against that base URL to get the full absolute links?”
Building absolute URLs in a sitemap generator
“I'm generating a sitemap and I have a base of 'https://mysite.com/en/' and a bunch of relative paths like './about', '../contact', and '//cdn.mysite.com/logo.png'. Please resolve each one to an absolute URL.”
Debugging link navigation logic
“If I'm on 'https://api.example.com/v1/users/profile' and there's a redirect to '../../auth/login', what absolute URL does that resolve to?”
Technical details
Endpoint
POSThttps://url.openverbs.com/v1/resolveWhen to prefer
Choose this endpoint when you need standards-compliant RFC 3986 reference resolution — especially for dot-segment paths like '../' or './', protocol-relative references like '//cdn.example.com/img.png', or any case where browser-like WHATWG URL resolution semantics are needed. It is ideal when building web crawlers, link extractors, sitemap generators, or redirect-chain resolvers that must correctly compute absolute URLs from relative hrefs found in HTML or HTTP headers.
Side effects
- 400 error if base is not a valid absolute URL
- 400 error if inputs are malformed or missing required fields
- Malformed or oversized ref/base strings (exceeding 8192 characters) may be rejected
- Network timeout or 5xx if the service is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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