# Case Convert Text Tool (x402 USDC)

> Case Convert Text Tool (x402 USDC) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.0001/call, status unknown (last checked 2026-09-15).

Converts input text to a specified casing style (upper, lower, title, sentence, camel, snake, or kebab) via a pay-per-call x402 USDC API.

## Facts

- Endpoint: GET https://gpt55.558686.xyz/v1/tools/case-convert
- Price: $0.0001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/case-convert-text-tool-x402-usdc-12909b8d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WDk5OWlUO40zZPKk1MIXD

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 case-convert-text-tool-x402-usdc-12909b8d
```

Example prompt: Convert the text 'hello world from the api' to title case — pay per call, no subscription needed.

## When to prefer this

Use this endpoint when you need a simple, stateless, pay-per-call text case conversion without a subscription, especially in automated pipelines that pay via x402 USDC on Base. Prefer it over subscription-based APIs when call volume is low or sporadic.

## Known failure modes

- Missing required 'text' query parameter returns an error
- Text exceeding 20,000 characters rejected
- Invalid 'case' enum value returns an error
- Insufficient USDC balance or failed x402 payment results in 402 Payment Required
- Network issues with Base blockchain payment layer cause timeouts

## How this service works

Convert text to upper, lower, title, sentence, camel, snake, or kebab case without calling an upstream model. Pay up to $0.001 per request with x402 USDC on Base. Public paid calls are limited to 1500 input characters and 128 output tokens.

## Output

A JSON object with an 'ok' boolean, 'tool' field set to 'caseConvert', the converted text result, and a 'fetchedAt' timestamp indicating when the conversion was performed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "additionalProperties": true
    },
    "queryParams": {
     "type": "object",
     "required": [
      "text"
     ],
     "properties": {
      "case": {
       "enum": [
        "upper",
        "lower",
        "title",
        "sentence",
        "camel",
        "snake",
        "kebab"
       ],
       "type": "string"
      },
      "text": {
       "type": "string",
       "maxLength": 20000,
       "minLength": 1
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "tool": {
       "type": "string"
      },
      "fetchedAt": {
       "type": "string"
      }
     },
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/case-convert-text-tool-x402-usdc-12909b8d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gpt55.558686.xyz](https://www.zero.xyz/host/gpt55.558686.xyz/llms.txt)