# PennyRail JSON Object to URL Query String Converter

> PennyRail JSON Object to URL Query String Converter 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 a URL query string (serializes object properties to URL-encoded query parameters)

## Facts

- Endpoint: POST https://pennyrail.vercel.app/api/p/nano/url.json-to-query--object-to-url-params
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pennyrail-json-object-to-url-query-string-converter-aa7647a6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4yaFgI_VFkuDsDQHHpu_s

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability pennyrail-json-object-to-url-query-string-converter-aa7647a6 -d '<json body>'
```

Example prompt: Convert this JSON object into a URL query string for me: {"page": 1, "limit": 50, "filter": "active", "sort": "name"}.

## When to prefer this

Use this endpoint when you need a quick, paid micro-service to reliably convert a JSON object to URL query parameters without writing your own serialization logic, especially within an automated agent workflow that already uses x402 payment rails.

## Known failure modes

- Missing or null 'input' property returns a validation error
- Non-object input type (e.g. array or primitive) may fail schema validation
- Deeply nested objects may not be serialized as expected depending on implementation
- Payment failure or insufficient USDC balance results in 402 response before processing

## How this service works

Machine-readable settlement service

## Output

Returns a query string representation of the input JSON object, with object keys and values serialized as URL-encoded query parameters (e.g. '?key1=value1&key2=value2').

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pennyrail-json-object-to-url-query-string-converter-aa7647a6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pennyrail.vercel.app](https://www.zero.xyz/host/pennyrail.vercel.app/llms.txt)