# Syntexa AgentShelf Constant Case Transform

> Syntexa AgentShelf Constant Case Transform is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.009/call, status unknown (last checked 2026-10-02).

Rewrites input text using CONSTANT_CASE (all uppercase with underscores) transformation, with no network calls or LLM involvement.

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/case-constant?utm_source=zero.xyz
- Price: $0.009/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/syntexa-agentshelf-constant-case-transform-db9fcd05
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0tct09wcS-l-Ig_QR2s43

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 syntexa-agentshelf-constant-case-transform-db9fcd05 -d '<json body>'
```

Example prompt: Can you rewrite 'maximum retry attempts' in constant case so I can use it as a configuration key?

## When to prefer this

Choose this endpoint when you need a deterministic, offline, pure constant-case (SCREAMING_SNAKE_CASE) text conversion without any LLM interpretation or network dependency. Prefer the free sandbox endpoint (/v1/sandbox/case-constant) first; use this paid endpoint when the sandbox is unavailable or rate-limited. Ideal for programmatic code generation, config key normalization, or environment variable naming at scale.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Text exceeding 100,000 characters is rejected
- Payment of exactly $0.009 USDC required; incorrect payment amount causes a 402 response
- Non-string input type causes schema validation failure

## How this service works

Call when an agent needs text rewritten with the constant case transform. No network and no LLM. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/case-constant first.

## Output

The input text returned as a CONSTANT_CASE string — all letters uppercased and words separated by underscores (e.g. 'hello world' becomes 'HELLO_WORLD'). No metadata, no LLM interpretation, purely deterministic string transformation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "examples": [
    "Hello, World!"
   ],
   "maxLength": 100000,
   "minLength": 1,
   "description": "Input for this SKU. The route description says whether it is plain text, a URL, base64 bytes, or an already-encoded token."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/syntexa-agentshelf-constant-case-transform-db9fcd05/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)