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Delx Swap Case
x402
Delx Swap Case is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-21).
Flips the case of every letter in a string — uppercase becomes lowercase and vice versa — as a stateless, deterministic text transform.
Price / call$0.001
Success—
StatusUnknown
How this service works
Swap letter case for deterministic transform tests. Call when you need a pure case flip without locale rules. Returns case-swapped text for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.
Output
Returns a plain text response containing the input string with every letter's case inverted — uppercase letters become lowercase and lowercase letters become uppercase; non-letter characters are passed through unchanged.
Example use cases
Deterministic test fixture generation
“I need a case-swapped version of 'The Quick Brown Fox Jumps Over The Lazy Dog' to use as a predictable test fixture in my string-processing unit tests.”
Inverting a user-typed label
“The user typed 'hELLO wORLD' — can you swap the case so it reads properly as 'Hello World'? Actually wait, just fully invert whatever they typed.”
Agent pipeline sanity check
“Run a case-flip on the string 'aGENT oUTPUT v2.3a' so I can verify my text pipeline is handling mixed-case tokens correctly before I ship this.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/swap-case?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a guaranteed, locale-neutral, deterministic case flip on a string — particularly in testing or pipeline-validation scenarios where you need a known reversible transform. It is not a locale-aware title-case or sentence-case converter; it simply mirrors each letter's case bit. Prefer it over building your own logic when you want a cheap, stateless, no-side-effect utility call.
Side effects
- Empty or missing 'text' field returns a validation error
- Excessively long strings may be rejected or time out
- Payment failure (insufficient USDC balance or x402 protocol error) results in a 402 response and no transform
- Non-UTF-8 or malformed input may produce unexpected output or an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Input field: text. |
Output
Schema · Response
{
"type": "json",
"example": {
"text": "hELLOwORLD",
"schema": "delx/util-swap-case/v1"
}
}Tags
x402
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