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Delx Commerce — Weighted Random Choice
x402
Delx Commerce — Weighted Random Choice is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Randomly selects one item from a list using weighted probabilities, returning the chosen item, its index, weight, and probability
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 ok (boolean), the chosen item as 'choice', its zero-based 'index' in the input array, its individual 'weight', the computed 'probability' (weight divided by total), and 'total_weight' summed across all items. Also includes a schema identifier 'delx/util-weighted-choice/v1'.
Example use cases
Weighted A/B test variant assignment
“I have three UI variants — 'control', 'variant_a', and 'variant_b' — and I want to show 'control' 50% of the time, 'variant_a' 30%, and 'variant_b' 20%. Pick one for this user session using weights 5, 3, and 2.”
Random prize tier selection for a giveaway
“I'm running a giveaway with three prize tiers: 'bronze', 'silver', and 'gold'. Bronze should come up most often, so give it weight 10, silver weight 3, and gold weight 1. Pick a prize tier for this winner.”
Randomized content recommendation with bias
“I want to recommend one content category to a user — 'news', 'sports', 'entertainment', or 'tech' — where news is twice as likely as the others. Use weights 2, 1, 1, 1 and tell me which category was selected and how likely it was.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/weighted-choice?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a stateless, pay-per-call weighted random selection with cryptographically verifiable delivery and no signup overhead. Prefer it over rolling your own PRNG when you need an auditable, reproducible random draw billed per use via USDC on Base or Solana. Ideal for agents that need probabilistic branching, A/B routing, weighted lotteries, or randomized content selection in a pipeline without managing server infrastructure.
Side effects
- Mismatched array lengths between items and weights — likely returns an error or undefined behavior
- Empty items or weights arrays — API may return an error response
- Non-numeric weights — validation failure expected
- Network or payment failure via x402 protocol — call not executed, no charge
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": 0,
"choice": "a",
"schema": "delx/util-weighted-choice/v1",
"weight": 1,
"probability": 0.25,
"total_weight": 4
}
}Tags
x402
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