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ONE Engine Text Pad-Start
x402
ONE Engine Text Pad-Start is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Left-pads a text string to a specified total length using a given fill character, equivalent to JavaScript's String.prototype.padStart().
Price / call$0.001
Success—
StatusUnknown
How this service works
Low-cost pay-per-call utility APIs for autonomous agents using x402 on Base.
Output
Returns a JSON object with a 'text' field containing the input string left-padded with the specified fill character until it reaches the desired total length. For example, padding '42' with '0' to length 5 yields '00042'.
Example use cases
Zero-pad numeric order IDs
“Take the order number 317 and pad it with leading zeros so it's exactly 8 digits long, like a formatted order ID.”
Format fixed-width report columns
“I have the text 'Sales' and I need it left-padded with spaces to be 20 characters wide for a fixed-width report column.”
Align version numbers with dots
“Pad the string '3' with dots on the left so it's 5 characters total — like '...3' — for display in a version table.”
Technical details
Endpoint
POSThttps://one-search.one-engine.workers.dev/v1/text/pad-start?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs deterministic, server-side string left-padding without executing local code — particularly useful in sandboxed or code-free agent environments. Prefer it for formatting fixed-width identifiers, zero-padded numbers, or left-aligned columns in automated pipelines where local string manipulation is unavailable or undesirable.
Side effects
- Missing required 'text' or 'length' fields returns a 4xx error
- If 'length' is less than or equal to the current string length, the original string is returned unchanged
- Non-integer 'length' value may cause a validation error
- Payment failure via x402 returns a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| fill | string | |
| text | string | |
| length | integer |
Output
Schema · Response
{
"type": "json",
"example": {
"text": "00042"
}
}Tags
x402
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