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Delx Count Substr
x402
Delx Count Substr 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).
Counts the number of non-overlapping occurrences of a substring (needle) within a given text string
Price / call$0.001
Success—
StatusUnknown
How this service works
Count non-overlapping substring occurrences. Call when you preflight how often a token appears in agent-held text. Returns integer count and needle 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 an integer count of non-overlapping occurrences of the needle within the text, along with the needle string itself. No data is retained server-side.
Example use cases
Token frequency check before LLM prompt
“Before I send this draft to the model, count how many times the word 'please' appears in it — I want to make sure it's not overly repetitive.”
Keyword audit in scraped content
“Scan this article text and tell me how many times the substring 'climate change' shows up — I need the count to decide if it's worth including in our topic index.”
Spam pattern detection in user message
“Check how many times the phrase 'click here' appears in this email body — if it's more than twice I want to flag it as suspicious.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/count-substrWhen to prefer
Use this endpoint when an AI agent needs a fast, cheap, local computation to count how many times a specific token or substring appears in text it already holds — no network calls, no external storage, no API keys required beyond x402 payment. Ideal for lightweight preflight checks on token frequency, keyword density, or repeated pattern detection within agent-held strings. At $0.001 USDC per call it is cost-effective for high-frequency agent loops.
Side effects
- Missing 'text' or 'needle' field returns a 400-level error
- Empty needle string may cause undefined behavior or error
- Payment not fulfilled via x402 results in 402 Payment Required response
- Very large text payloads may exceed request size limits
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Input field: text. |
| needle | string | Input field: needle. |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 2,
"needle": "delx",
"schema": "delx/util-count-substr/v1"
}
}Tags
x402
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