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Delx Commerce — String Starts-With Check
x402
Delx Commerce — String Starts-With Check 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).
Checks whether a given text string starts with a specified prefix, returning a boolean result.
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 containing the prefix that was tested, a boolean 'result' field (true if the text starts with the prefix, false otherwise), and a schema identifier string ('delx/util-starts-with/v1') for verifiable, typed responses.
Example use cases
URL scheme validation before fetch
“Before fetching this link, can you confirm that 'ftp://files.example.com/doc.pdf' starts with 'https://' so I know it's safe to follow?”
Order ID prefix verification
“I have an order ID 'ORD-20240512-9921' — can you check whether it starts with 'ORD-' to confirm it's in the right format?”
File path prefix check for routing
“Does the file path '/var/logs/app/error.log' start with '/var/logs/' so I can route it to the log processor?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/starts-with?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a verifiable, pay-per-call, no-signup string prefix check — especially in agentic pipelines where auditability (schema-tagged responses) and micro-payment compatibility (USDC via x402) matter. Prefer it over native language-model string checks when you need a deterministic, structured, provable result rather than a probabilistic inference.
Side effects
- Missing 'text' or 'prefix' field returns a validation error
- Empty string inputs may return unexpected true/false results depending on implementation
- Payment failure via x402 protocol blocks the call
- Network timeout returns no result
- Malformed JSON body causes a 400-level error
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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