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PennyRail URL JSON-to-Query Builder
x402
PennyRail URL JSON-to-Query Builder is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Converts a JSON object into URL query string parameters for use in HTTP requests
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a query string representation of the input JSON object, with keys and values URL-encoded and formatted as standard query parameters (e.g. key1=value1&key2=value2), ready to be appended to a URL.
Example use cases
Convert filter params to query string
“I have a JSON object with search filters like {"category": "electronics", "brand": "Sony", "minRating": 4} and I need to turn it into a URL query string so I can make a GET request to a product search API.”
Build redirect URL with tracking params
“Turn this JSON into URL query parameters for a redirect link: {"utm_source": "newsletter", "utm_medium": "email", "utm_campaign": "spring_sale", "ref": "abc123"}.”
Serialize API request as query params
“I need to call a legacy API that only accepts GET requests, so please convert this JSON payload — {"userId": "u_789", "startDate": "2024-01-01", "endDate": "2024-03-31", "format": "summary"} — into a query string I can attach to the URL.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/url.json-to-query--build-query-paramsWhen to prefer
Choose this endpoint when you need a quick, pay-per-call microservice to convert JSON objects into URL query strings without deploying your own serialization logic. Useful in agent workflows that need to bridge JSON-based data structures with legacy GET-only APIs or URL-based routing systems.
Side effects
- Missing or malformed 'input' field returns a validation error
- Deeply nested or complex objects may not serialize predictably
- Arrays within the JSON may require specific serialization format (e.g. repeated keys vs bracket notation)
- Payment failure or insufficient USDC balance returns HTTP 402
- Non-serializable values (functions, circular references) may cause errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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