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Delx Commerce — Is-Subset Array Validator
x402
Delx Commerce — Is-Subset Array Validator 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 array A is a subset of array B, returning a boolean result with element counts for both arrays.
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 a 'subset' boolean indicating whether array A is entirely contained in array B, along with 'a_count' (number of elements in A) and 'b_count' (number of elements in B), and a schema identifier string.
Example use cases
Permission scope validation
“Check if the permissions ["read", "write"] are all included within the granted permissions ["read", "write", "delete", "admin"] — I need to know if the requested scope is fully covered.”
Tag filtering for content rules
“Are the required tags ["urgent", "billing"] all present in this ticket's tags ["urgent", "billing", "refund", "escalated"]? I want to know if it qualifies for auto-routing.”
Feature flag prerequisite check
“Verify whether the required feature flags ["dark_mode", "beta_checkout"] are all included in the user's enabled flags ["dark_mode", "beta_checkout", "notifications"] before unlocking the premium flow.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/is-subset?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call subset check with no signup overhead, especially in agent workflows that require verifiable, micropayment-gated computation. Prefer it over implementing custom set logic when you want a stateless, auditable result with guaranteed delivery confirmation via USDC on Base or Solana.
Side effects
- Missing or malformed 'a' or 'b' fields returns an error
- Non-array values for 'a' or 'b' may cause a validation error
- Payment failure via x402 protocol results in a 402 response and no result
- Empty array A may return subset=true (vacuous truth), which can be unexpected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| a | array | Input field: a. |
| b | array | Input field: b. |
Output
Schema · Response
{
"type": "json",
"example": {
"schema": "delx/util-is-subset/v1",
"subset": true,
"a_count": 2,
"b_count": 3
}
}Tags
x402
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