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Delx Is Subset
x402
Delx Is Subset 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).
Checks whether all elements of list A are contained within list B, returning a boolean subset result
Price / call$0.001
Success—
StatusUnknown
How this service works
Check whether list a is subset of list b. Call when you verify required tags are present in agent sets. Returns subset boolean 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
A boolean value indicating whether every element in list A also appears in list B (true if A is a subset of B, false otherwise). No additional metadata or retention occurs; result is computed locally and returned immediately.
Example use cases
Required tags present in agent output
“I need to verify that all of my required tags — ["priority", "category", "owner"] — are actually present in this agent's output tag set ["priority", "category", "owner", "timestamp", "source"]. Can you check if the first list is a complete subset of the second?”
Permission scope validation before action
“Before I let this workflow proceed, check whether all the permissions it needs — ["read:users", "write:logs"] — are included in the granted permission set ["read:users", "write:logs", "read:metrics"]. Is the required set a subset of what's been granted?”
Prerequisite feature check for agent capability
“I want to confirm that all the features my agent requires — ["tool_use", "memory", "streaming"] — are available in the target runtime's feature list ["tool_use", "memory"]. Is the required features list a subset of the available ones?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/is-subsetWhen to prefer
Use this endpoint when you need a fast, cheap, stateless check to verify that one list's elements are all contained within another list — particularly for agent-side tag validation, permission checking, or prerequisite verification. At $0.001 USDC per call it is cost-effective for high-frequency checks in automated pipelines. Prefer this over writing inline set logic when you want a reliable, auditable, externally-computed result without managing state or keys.
Side effects
- Non-array input for either parameter causes a validation error
- Empty list A always returns true (empty set is subset of any set)
- Duplicate elements in either list may affect comparison depending on implementation
- Network timeout if the service is temporarily unavailable
- Incorrect type elements in arrays (e.g., mixed types) may cause unexpected comparison results
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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