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Delx Starts With
x402
Delx Starts With is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Checks whether a given text string begins with a specified prefix, returning a boolean result.
Price / call$0.001
Success—
StatusUnknown
How this service works
Check whether text starts with a prefix. Call when you gate URL/scheme or header prefix checks before egress. Returns boolean result and prefix 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 JSON object containing a boolean indicating whether the text starts with the given prefix, along with the prefix that was tested.
Example use cases
URL scheme validation before egress
“Before sending this request out, check if the URL 'ftp://legacy-server.example.com/data' starts with 'https://' so we know whether it's safe to proceed.”
Authorization header prefix check
“Can you verify whether the header value 'Bearer eyJhbGciOiJIUzI1NiJ9...' starts with 'Bearer ' before we pass it to the auth layer?”
Filename convention enforcement
“I need to confirm that the filename 'report_2024_Q1.csv' starts with 'report_' to make sure it follows our naming convention — can you check that?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/starts-withWhen to prefer
Choose this endpoint when you need a fast, stateless, single-purpose prefix check without spinning up local string logic in an agent pipeline — especially useful for gating URL scheme validation, header format checks, or protocol prefix enforcement before egress. Prefer it over heavier text-analysis endpoints when all you need is a simple boolean starts-with result.
Side effects
- Missing 'text' or 'prefix' field returns a validation error
- Empty string inputs may produce unexpected true results (empty prefix matches everything)
- Payment failure via x402 if USDC balance is insufficient
- Non-string input types may cause schema validation errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Input field: text. |
| prefix | string | Input field: prefix. |
Output
Schema · Response
{
"type": "json",
"example": {
"prefix": "https://",
"result": true,
"schema": "delx/util-starts-with/v1"
}
}Tags
x402
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