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Delx Seeded Permutation Index
x402
Delx Seeded Permutation Index is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-20).
Given a seed string and a count, deterministically computes a permutation index value using a seeded algorithm — no external calls, no data retention.
Price / call$0.001
Success—
StatusUnknown
How this service works
Seeded Permutation Index: Seeded Permutation Index selects one reproducible permutation index within a caller count from bounded caller-supplied values without an external provider. Call Seeded Permutation Index 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 Permutation Index as versioned deterministic JSON. Price: $0.001 USDC via x40…
Output
Returns a JSON object containing a numeric permutation_index derived from the seed and count, the operation name, a SHA-256 hash of the input for auditability, confirmation that no data was retained and no external calls were made, and a pass/fail status.
Example use cases
Stable A/B test bucket assignment
“I need to assign user 'usr_8821' to one of 10 experiment buckets reproducibly — use the seed 'usr_8821' with a permutation count of 10 to get the index.”
Seeded item selection from a list
“I have 250 items and want to pick one consistently based on the seed 'daily-promo-2024-06-15' — compute the permutation index for count 250 with that seed.”
Deterministic agent decision branching
“For agent session 'sess_alpha_7', I need a reproducible decision index out of 50 possible branches — run the seeded permutation with seed 'sess_alpha_7' and permutation count 50.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/seeded-permutation-index?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a deterministic, reproducible integer index derived from a seed string and a count — ideal for stable bucketing, A/B assignment, seeded shuffle selection, or any agent workflow requiring consistent permutation results without external randomness sources. Prefer it over local PRNG implementations when auditability (via SHA-256 evidence) and in-memory-only processing guarantees matter.
Side effects
- Missing or empty seed string causes validation error
- permutation_count of zero or negative integer may produce an error or undefined result
- Seed exceeding 8192 characters will be rejected
- Malformed JSON body returns 400 Bad Request
- Payment not provided or insufficient USDC results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seed | string | Seed supplied to Seeded Permutation Index; used only for this bounded calculation and processed in memory without retention. |
| permutation_count | integer | Permutation Count supplied to Seeded Permutation Index; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"cryptographic": false,
"permutation_index": 630
},
"schema": "delx/util-seeded-permutation-index/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "937802095c874e8dbf650e4af5cd07ddb5c7691d8eb727c6466e648e0050b056",
"external_calls": 0
},
"operation": "seeded_decision:seeded_permutation_index"
}
}Tags
x402
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