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Delx Seeded Multivariate Assignment
x402
Delx Seeded Multivariate Assignment 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 assigns a variant from a weighted list using a seed and subject, enabling reproducible A/B or multivariate test bucketing.
Price / call$0.001
Success—
StatusUnknown
How this service works
Seeded Multivariate Assignment: Seeded Multivariate Assignment assigns a stable subject to one weighted variant from bounded caller-supplied values without an external provider. Call Seeded Multivariate Assignment 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 Multivariate Assignment as versioned deterministic JSON. Price: $0.001 USDC…
Output
Returns a JSON object containing the assigned variant name and its index in the variants array, along with a schema identifier, status, and an evidence block confirming no data was retained, the SHA-256 hash of the input, and zero external calls made.
Example use cases
Feature flag rollout bucketing
“I'm rolling out a new checkout flow to 20% of users — assign user 'acct-8821' to either 'new-checkout' or 'legacy-checkout' using seed 'checkout-rollout-v3' with weights [0.2, 0.8] so I get the same answer every time for that user.”
Multivariate copy testing
“I have three email subject lines — 'subject-a', 'subject-b', and 'subject-c' — each with equal weight. Use seed 'email-campaign-jan' and subject 'subscriber-99123' to deterministically assign which one this subscriber should see.”
Personalized content variant selection
“For my recommendation engine, assign session 'sess-xyz789' to one of these content layouts — 'grid', 'list', or 'carousel' — using seed 'layout-test-q1' with weights [0.5, 0.3, 0.2]. I need the assignment to be stable for the same session every time.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/seeded-multivariate-assignmentWhen to prefer
Choose this endpoint when you need a stateless, reproducible, weighted variant assignment that produces the same result for the same seed+subject combination every time, without any server-side state or user data retention. Prefer it over custom hashing logic when you want an auditable evidence trail (input hash, no external calls) and need weighted (non-uniform) probability splits across more than two variants.
Side effects
- Mismatched lengths between variants and weights arrays — may return an error or undefined behavior
- Seed or subject strings exceeding 8192 characters — request rejected
- Weights array exceeding 256 items — request rejected
- Variants array exceeding 256 items — request rejected
- Malformed input types (e.g. non-numeric weights) — validation error
- Payment failure via x402 protocol — 402 response, no computation performed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seed | string | Seed supplied to Seeded Multivariate Assignment; used only for this bounded calculation and processed in memory without retention. |
| subject | string | Subject supplied to Seeded Multivariate Assignment; used only for this bounded calculation and processed in memory without retention. |
| weights | array | Weights supplied to Seeded Multivariate Assignment; used only for this bounded calculation and processed in memory without retention. |
| variants | array | Variants supplied to Seeded Multivariate Assignment; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"index": 2,
"variant": "copy-b"
},
"schema": "delx/util-seeded-multivariate-assignment/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "d4cc54b28dc2c9127391313e2d1f0fdfeb7409cb441c2107a91ae423c62cc39c",
"external_calls": 0
},
"operation": "seeded_decision:seeded_multivariate_assignment"
}
}Tags
x402
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