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Delx Commerce — Seeded Weighted Choice
x402
Delx Commerce — Seeded Weighted 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).
Deterministically selects one item from a weighted list using a seed, returning the chosen item's index and value with verifiable evidence.
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 containing the selected item's value and its zero-based index, a pass/fail status, the operation schema identifier ('delx/util-seeded-weighted-choice/v1'), and an evidence block confirming no data was retained, the SHA-256 hash of the input, and that zero external calls were made.
Example use cases
Reproducible A/B variant assignment
“Assign this user to one of two variants — 'control' or 'treatment' — using weights 70 and 30 and the seed 'user-session-8821', and confirm no data was retained.”
Weighted winner selection for a campaign
“Pick one winner from this list — 'Alice', 'Bob', 'Carol', 'Dave' — with weights 10, 5, 3, 2 using the seed 'promo-draw-2025', and give me the selected name and its index.”
Probabilistic task routing for an agent fleet
“Route this job to one of three agents — 'agent-alpha', 'agent-beta', 'agent-gamma' — weighted at 60, 25, 15 using seed 'job-id-99123', and show me which one was chosen.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/seeded-weighted-choice?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a verifiable, reproducible weighted random selection — especially in agentic workflows where auditability matters (e.g. lotteries, A/B routing, task assignment) and you need cryptographic proof that no input data was stored. It is ideal when determinism from a seed is required, unlike true-random endpoints. At $0.001 USDC per call with no signup, it suits high-frequency agent pipelines.
Side effects
- Mismatched array lengths between items and weights — likely returns a validation error
- Seed string exceeds 8192 characters — rejected by schema
- Items or weights array exceeds 256 elements — rejected
- All weights are zero — undefined selection behavior
- Malformed JSON body — HTTP 400 or payment not triggered
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seed | string | Seed supplied to Seeded Weighted Choice; used only for this bounded calculation and processed in memory without retention. |
| items | array | Items supplied to Seeded Weighted Choice; used only for this bounded calculation and processed in memory without retention. |
| weights | array | Weights supplied to Seeded Weighted Choice; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"index": 0,
"selected": "fast"
},
"schema": "delx/util-seeded-weighted-choice/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "c6638a85aa14e9c05d911356c0a5fbd65272dc5841db91ed4d836ca7d4bf523b",
"external_calls": 0
},
"operation": "seeded_decision:seeded_weighted_choice"
}
}Tags
x402
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