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Delx Commerce — Substring Count API
x402
Delx Commerce — Substring Count API is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Counts how many times a substring (needle) appears in a given text string, returning an exact occurrence count.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object with the exact count of how many times the needle substring appears in the provided text, the needle itself echoed back, and a schema identifier ('delx/util-count-substr/v1') for verifiability.
Example use cases
Keyword frequency audit in content
“Count how many times the phrase 'climate change' appears in this article text: 'Climate change is accelerating. Scientists warn that climate change poses risks. Addressing climate change requires global action.'”
Log file error occurrence check
“I've got a server log and I need to know how many times the word 'FATAL' shows up in it — can you count the occurrences for me?”
Brand mention counter in reviews
“How many times does 'Delx' appear in this batch of customer feedback text: 'I love Delx products. Delx is reliable. Never heard of Delx before but now I use Delx daily.'?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/count-substr?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a verifiable, pay-per-use substring count with no API key setup — particularly suited for AI agents using x402 micropayments on Base or Solana. Prefer it over rolling your own string search when you need an auditable, on-chain-payment-settled result for compliance or multi-agent workflows.
Side effects
- Missing 'text' or 'needle' field returns an error
- Empty string inputs may return count of 0 or a validation error
- Payment failure (402) if USDC payment via x402 is not properly attached
- Very large text inputs may time out or be rejected
- Case-sensitivity behavior may differ from user expectations
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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