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Halowerk Form Dry-Run Validator
x402
Halowerk Form Dry-Run Validator is a paid API for AI agents from lauf.halowerk.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Loads a public HTTPS page in a headless browser, fills a specified form with provided values, and validates all fields client-side without actually submitting the form.
Price / call$0.01
Success—
StatusUnknown
How this service works
Loads a public https page, finds the requested form, fills your values into it in a real headless browser and reports what a submission would run into — without submitting. Each field is checked against what the page itself declares: whether it is required and empty, whether the value matches the field type for email, url, number, tel, date, time and color, and whether a select value is one of the offered options.
Output
A structured report listing each form field that was checked, whether it passed or failed validation, the reason for failure (e.g. required-and-empty, type mismatch for email/url/number/tel/date/time/color, or invalid select option), and an overall pass/fail summary — all without the form being submitted.
Example use cases
Pre-check job application form
“I want to fill out the application form at https://jobs.acme.com/apply with my details — email: 'alice@gmail.com', start_date: '2025-06-01', salary_expectation: '85000', position: 'Software Engineer' — can you do a dry-run and tell me if anything would fail before I actually submit?”
Validate newsletter signup values
“Before my marketing tool submits to the newsletter form at https://newsletter.example.com/signup, dry-run it with email: 'user@domain.com', country: 'US', and birthdate: '1990-13-01' to see if any of those values would trigger a validation error.”
Test e-commerce checkout field types
“Can you load the checkout form at https://shop.example.com/checkout, fill it with shipping_zip: 'ABCDE', card_number: '4111111111111111', delivery_date: '2025-07-15', and do a dry-run to check whether any fields reject those values?”
Technical details
Endpoint
POSThttps://lauf.halowerk.com/v1/form-dryrunWhen to prefer
Use this endpoint when you need to verify that a set of form field values will pass the live page's own client-side validation rules before committing to a real submission. It is uniquely suited for agents that must pre-check form data against actual HTML constraints (required, type, select options) as declared by the page itself, rather than relying on a static schema or guessing. Prefer it over generic form-submission endpoints when avoiding side effects is critical, or when you need to catch validation errors cheaply before a real action.
Side effects
- Page URL is not publicly accessible or returns a non-200 status
- Form selector does not match any form on the page
- Page requires JavaScript-heavy rendering that times out in headless browser
- Field names provided do not match any input elements found in the form
- Page is behind authentication and cannot be loaded without credentials
- Captcha or bot-detection blocks headless browser access
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | The https page carrying the form. |
| values | object | Field name to value. Field names are the name attributes of the form controls; use form_index first with an empty probe if you do not know them. |
| form_name | string | Pick the form by its name or id instead of by position. Wins over form_index when both are given. |
| form_index | integer | Which form on the page, in document order. Default is the first. |
Tags
x402
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