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Delx Pick Fields
x402
Delx Pick Fields is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Extracts a shallow whitelist of specified keys from a JSON object, returning only those key-value pairs
Price / call$0.001
Success—
StatusUnknown
How this service works
Pick a shallow whitelist of keys from a JSON object — first-party local utility for agent preflight and proven micro-utils expansion. Returns deterministic machine-readable JSON for $0.001 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, no web search, no live RPC, and no mediagen. Results are advisory; the caller owns authorization, budgets, and production controls. Sibling of Delx routes that already converted e…
Output
A JSON object containing only the key-value pairs from the input object whose keys appear in the provided keys array. Keys not present in the input object are silently omitted. The result is deterministic and machine-readable.
Example use cases
Slim down API response before storage
“I got back a huge user profile object from an API — it has dozens of fields but I only need name, email, and plan. Can you pick just those three fields out of the object and give me the trimmed version?”
Preflight payload before signing
“Before I sign this JSON payload, I want to drop everything except the id, timestamp, and amount fields. Pick just those keys from the object so I'm only signing what matters.”
Filter agent context before forwarding
“I'm about to forward this agent context object to the next step in my pipeline, but it contains sensitive fields. Pick only the keys ["task", "priority", "deadline"] from the context object and send that along instead.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/pick-fieldsWhen to prefer
Use this endpoint when you need a deterministic, stateless, zero-retention way to filter a JSON object to a specific set of keys — especially in agent preflight steps, payload minimization before signing or caching, or when trimming API responses before passing them downstream. Prefer it over writing inline filtering logic when you want a consistent micro-utility with a predictable cost and no side effects.
Side effects
- Missing or empty keys array returns an empty object
- Non-object input for the object field returns an error
- Malformed JSON input causes a 400-level error
- Keys array containing non-string values may cause a validation error
- All specified keys absent from object returns an empty object
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| keys | array | Input field: keys. |
| object | object | Input field: object. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"object": {
"a": 1,
"c": 3
},
"schema": "delx/util-pick-fields/v1",
"missing": [
"z"
],
"picked_count": 2
}
}Tags
x402
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