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Delx Seeded Weighted Choice
x402
Delx Seeded 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).
Deterministically selects one item from a weighted list using a seed string, returning the chosen item and its index.
Price / call$0.001
Success—
StatusUnknown
How this service works
Seeded Weighted Choice: Seeded Weighted Choice selects one item using non-negative caller weights from bounded caller-supplied values without an external provider. Call Seeded Weighted Choice when an agent needs a reproducible decision that another run can independently replay. Returns the deterministic selection plus seed provenance, population bounds, and the operation-specific outcome for Seeded Weighted Choice as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party…
Output
Returns a JSON object containing the selected item string, its zero-based index in the input array, operational metadata including whether input was retained (always false), a SHA256 hash of the inputs for auditability, and the number of external calls made (always 0). The schema version and operation name are also included.
Example use cases
Reproducible A/B variant assignment
“Given the user ID 'user-8821' as my seed, pick one of ["control", "variant_a", "variant_b"] with weights [0.5, 0.3, 0.2] — I need the same user to always land in the same bucket.”
Weighted random task routing for agents
“I have three agents — Alpha, Beta, Gamma — and I want to assign tasks with probabilities 0.5, 0.3, 0.2. Use the task ID 'task-991' as the seed so the assignment is deterministic and auditable.”
Seeded prize tier selection for a campaign
“For our campaign draw, pick one prize tier from ["grand", "silver", "consolation"] with weights [0.05, 0.15, 0.8] using the entry code 'ENTRY-2024-XZ' as the seed so the result is verifiable.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/seeded-weighted-choiceWhen to prefer
Choose this endpoint when you need deterministic, reproducible weighted selection — i.e., the same seed must always produce the same result. It is ideal for auditable decisions (A/B testing, task routing, prize draws) where you need a verifiable input hash and guaranteed no data retention. Prefer this over pure random selection when reproducibility and auditability matter, and over client-side implementations when you want a governed, logged, off-device computation.
Side effects
- Mismatched array lengths between items and weights — likely returns a validation error
- Weights summing to zero or containing negative values — undefined or error behavior
- Items or weights arrays exceeding 256 elements — rejected by maxItems constraint
- Seed string exceeding 8192 characters — rejected by maxLength constraint
- Empty items array — no item to select, likely an error response
- Invalid JSON body — HTTP 400 or parse error
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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