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Seeded Random Sample
x402
Seeded Random Sample 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).
Selects a reproducible, deterministic random sample without replacement from a caller-supplied list using a seed string, returning sampled values, original indices, and a seed hash.
Price / call$0.001
Success—
StatusUnknown
How this service works
Select a reproducible sample without replacement from a bounded caller-supplied list. Use when multiple agents or retries must reach the same selection from the same seed. Returns sampled values, original indices, and a seed hash for 0.001 USDC via x402 on Base; local-only, stateless, and no input retention.
Output
Returns the sampled subset of values drawn from the input list, their original zero-based indices within the input array, and a hash of the seed used — enabling reproducibility verification. Sample is without replacement, deterministic for a given seed and input.
Example use cases
Reproducible lottery winner selection
“I need to pick 3 winners from this list of 50 entrant names in a way that's verifiable and reproducible — use seed 'contest-2024-final' so anyone can confirm the draw later.”
Consistent task assignment across agent retries
“Assign 10 tasks randomly from this pool of 200 jobs to a worker agent using seed 'batch-run-77', and make sure re-running the assignment gives the exact same 10 tasks.”
Deterministic A/B test group sampling
“From this list of 500 user IDs, sample 100 for the treatment group using seed 'experiment-cohort-3' so the same users are always selected if the experiment needs to be re-run.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/seeded-random-sampleWhen to prefer
Choose this endpoint when you need a reproducible, auditable random sample that multiple agents or retries must agree on. Ideal for distributed agent workflows where consistency across runs is critical, or when you need to prove to a third party that a selection was made fairly from a fixed seed. Prefer over local PRNG when the selection must be stateless, verifiable, and consistent across different environments or machines.
Side effects
- count exceeds items length — cannot sample more items than available without replacement
- count or items array exceeds maximum bounds (1000)
- seed string missing or empty — required for deterministic output
- malformed items array or non-array type
- payment not completed — x402 payment required before response is returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seed | string | |
| count | integer | |
| items | array |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 2,
"sample": [
"gamma",
"beta"
],
"schema": "delx/util-seeded-random-sample/v1",
"indices": [
2,
1
],
"seed_sha256": "f55bbb81faa69aaf4936ce9f0aa962c442851e4550566b83cc10573d585a0ed2",
"source_count": 4,
"without_replacement": true
}
}Tags
x402
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