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Delx Commerce — Seeded A/B Assignment
x402
Delx Commerce — Seeded A/B Assignment 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).
Deterministically assigns a subject to an A/B test variant (A or B) based on a seed and optional weight, returning a verifiable bucket value and variant label.
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 a JSON object with the assigned variant ('A' or 'B'), a numeric bucket value between 0 and 1, the operation schema identifier, a pass/fail status, and an evidence block confirming no data was retained, the SHA-256 hash of the input, and that zero external calls were made.
Example use cases
Feature flag rollout by user ID
“I need to deterministically assign user 'acct_20291' to either the new checkout flow or the old one using seed 'checkout-redesign-q2' — weight A at 80% and tell me which variant they get.”
Reproducible experiment bucketing for replay
“Re-run the A/B assignment for subject 'session_4477' with seed 'promo-banner-test' and equal weights so I can verify they were in variant B during last week's experiment.”
Agent routing by variant split
“Split incoming agent requests between two prompt strategies — assign subject 'req_id_9912' using seed 'prompt-strategy-sept' with 60% weight for variant A and tell me the bucket score.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/seeded-ab-assignment?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a stateless, reproducible, and verifiable A/B assignment with no data retention — especially in agent pipelines where auditability matters, you want a cryptographic hash of inputs as evidence, and you need to pay per-result with no upfront signup or subscription.
Side effects
- Missing required fields (seed or subject) may return a validation error
- Malformed JSON body returns a 400-level error
- Payment not included or insufficient USDC results in a 402 Payment Required response
- seed or subject strings exceeding 8192 characters may be rejected
- Network timeout on the Base/Solana payment settlement layer
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seed | string | Seed supplied to Seeded Ab Assignment; used only for this bounded calculation and processed in memory without retention. |
| subject | string | Subject supplied to Seeded Ab Assignment; used only for this bounded calculation and processed in memory without retention. |
| weight_a | number | Weight A supplied to Seeded Ab Assignment; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"bucket": 0.207537504388443,
"variant": "A"
},
"schema": "delx/util-seeded-ab-assignment/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "96739ac478c933dfd4385515e11012fab06dfd8342764dd368da174bbe750bfa",
"external_calls": 0
},
"operation": "seeded_decision:seeded_ab_assignment"
}
}Tags
x402
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