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Delx Index Of
x402
Delx Index Of 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).
Finds the first index of a substring (needle) within a given text, returning the position and a found flag.
Price / call$0.001
Success—
StatusUnknown
How this service works
Find first index of a substring. Call when you need slice boundaries for agent text surgery. Returns index and found flag (-1 if missing) 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 the integer index of the first occurrence of the needle within the text (or -1 if not found), plus a boolean found flag indicating whether the needle was present.
Example use cases
Locate delimiter before splitting
“In the string 'user:admin:1234', find the first index of the colon ':' so I can split the username out correctly.”
Check if keyword present in log line
“Tell me if the word 'FAILED' appears in this log line and where: 'Task scheduler FAILED to complete job 99 at 03:00'.”
Find tag start for text surgery
“I need to know the index of '<body>' in this HTML snippet so I can insert content right before it: '<!DOCTYPE html><html><head></head><body><p>Hello</p></body></html>'.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/index-ofWhen to prefer
Use this endpoint when an agent needs a quick, cheap, local string-search operation with no external dependencies — especially for finding slice boundaries before doing text surgery, locating delimiters, or confirming substring presence with an exact position. Prefer it over regex or full-text-search endpoints when only a simple first-index lookup is needed and cost/latency must be minimal.
Side effects
- Missing 'text' or 'needle' fields returns a validation error
- Empty needle string may return index 0 or an error depending on implementation
- Very large text payloads may be rejected or time out
- Payment failure via x402 returns a 402 response before processing occurs
- Malformed JSON body returns a 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Input field: text. |
| needle | string | Input field: needle. |
Output
Schema · Response
{
"type": "json",
"example": {
"found": true,
"index": 6,
"schema": "delx/util-index-of/v1"
}
}Tags
x402
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