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Delx Commerce — Seeded Reservoir Sample
x402
Delx Commerce — Seeded Reservoir Sample is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Returns a reproducible random sample of integers from a list using a seed, with cryptographic evidence of no data retention or external calls.
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 the sampled items (as an integer array), their original indices, an operation name, schema version, a pass/fail status, and an evidence block containing a SHA-256 hash of the input, a flag confirming no data was retained, and a count of zero external calls made.
Example use cases
Reproducible lottery draw from candidates
“I have a list of 50 participant IDs as integers and I need to pick 10 winners. Use seed 'contest-2024-Q3' so the draw is reproducible and auditable, and confirm no data was stored.”
Agent decision tie-breaking with fixed seed
“My agent needs to deterministically pick 2 tasks from this list [101, 102, 103, 104, 105] using seed 'agent-run-7f3a' so it always makes the same choice given the same run identifier.”
Random test dataset split with verifiable seed
“Split this array of integers [1,2,3,4,5,6,7,8,9,10] by sampling 4 elements using seed 'split-seed-v1', and give me evidence that the input wasn't retained externally.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/seeded-reservoir-sample?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need deterministic, reproducible random sampling from an integer array and require cryptographic proof that the input was not retained and no external calls were made — particularly useful in auditable agent workflows, privacy-sensitive contexts, or trust-minimized environments where verifiable computation matters. Prefer it over a generic shuffle or random library call when on-chain payment accountability and evidence of stateless processing are required.
Side effects
- items array exceeds 256-element limit — request rejected
- seed string exceeds 8192 character limit — request rejected
- count greater than items length — may return fewer results or error
- malformed JSON body — HTTP 400 response
- payment not provided or insufficient USDC — HTTP 402 response
- invalid integer types in items array — schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seed | string | Seed supplied to Seeded Reservoir Sample; used only for this bounded calculation and processed in memory without retention. |
| count | integer | Count supplied to Seeded Reservoir Sample; used only for this bounded calculation and processed in memory without retention. |
| items | array | Items supplied to Seeded Reservoir Sample; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"items": [
1,
3,
5
],
"indices": [
0,
2,
4
]
},
"schema": "delx/util-seeded-reservoir-sample/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "fe584420fbe1d387c960f909168094961a1eae04083c9ffe25a052869b8a68e5",
"external_calls": 0
},
"operation": "seeded_decision:seeded_reservoir_sample"
}
}Tags
x402
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