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Delx Weighted Choice
x402
Delx Weighted Choice is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Picks one item from a list using non-negative weights, returning a single sampled selection as deterministic JSON
Price / call$0.001
Success—
StatusUnknown
How this service works
Pick one item from a list using non-negative weights — 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…
Output
Returns a JSON object containing the chosen item from the input array, selected with probability proportional to its corresponding weight. Typically includes the selected item value and possibly its index.
Example use cases
Weighted AI model routing
“I have three AI models — 'gpt-4', 'claude-3', 'gemini-pro' — and I want to route requests to them with weights 60, 30, and 10 respectively. Pick one for this next request.”
Randomized A/B content variant selection
“I have two ad copy variants — 'Buy now and save 20%' and 'Limited time offer' — and I want to show the first one 70% of the time and the second 30%. Pick which one to show this user.”
Probabilistic task assignment to agents
“I have a pool of worker agents: 'agent-alpha', 'agent-beta', 'agent-gamma', with reliability scores of 5, 3, and 2. Use those as weights to randomly pick which agent should handle the next job.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/weighted-choiceWhen to prefer
Use this endpoint when you need a lightweight, stateless, single-call weighted random selection from a finite list — especially during agent preflight, traffic splitting, probabilistic routing, or any scenario where you need one item sampled proportionally to non-negative weights. Prefer it over building your own sampling logic when you need a cheap ($0.001 USDC), fast, machine-readable result with no side effects and no data retention.
Side effects
- Mismatched array lengths between items and weights returns an error
- Negative weight values cause validation failure
- Empty items or weights arrays return an error
- All-zero weights array may cause undefined behavior or error
- Malformed JSON input returns a parsing error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| items | array | Input field: items. |
| weights | array | Input field: weights. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"index": 1,
"choice": "b",
"schema": "delx/util-weighted-choice/v1",
"weight": 2,
"probability": 0.5,
"total_weight": 4
}
}Tags
x402
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