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Delx Commerce — Seeded Holdout Assignment
x402
Delx Commerce — Seeded Holdout 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 a treatment or holdout group based on a seed and holdout fraction, returning a verifiable group assignment with no data retention.
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 containing the group assignment ('treatment' or 'holdout'), a deterministic bucket float value, status, schema version, and an evidence block with the input SHA-256 hash, a flag confirming no data was retained, and a count of zero external calls — enabling verifiable, auditable group assignment.
Example use cases
Canary rollout traffic splitting
“I'm rolling out a new feature to 10% of users as a canary — use seed 'feature_dark_mode' and a holdout fraction of 0.1 to check if user 'u_987654' should get the new experience or stay in holdout.”
Reproducible A/B test assignment
“For my pricing experiment, assign customer 'cust_29301' to treatment or control using seed 'pricing_exp_q3' with a 20% holdout fraction — I need the same answer every time I call this.”
Privacy-safe experiment audit
“Can you re-check which group 'session_xyz' was assigned to in experiment seed 'onboarding_v3' with a 15% holdout? I need the bucket value and the input hash to verify the result without any stored data.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/seeded-holdout-assignment?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need deterministic, reproducible, and verifiable holdout/treatment group assignments with strong privacy guarantees (no data retention) and an on-chain payment audit trail. It is ideal for agent workflows that must assign subjects to experiment groups in a stateless, pay-per-call manner without managing experiment infrastructure or user databases. Prefer it over full-featured experimentation platforms when you need a lightweight, single-call computation with cryptographic evidence of the result.
Side effects
- Missing required fields (seed, subject, holdout_fraction) result in a validation error
- holdout_fraction outside [0,1] range may cause unexpected assignment behavior
- Payment failure via x402 (USDC on Base or Solana) blocks the request
- Malformed JSON input returns a parsing error
- Extremely long seed or subject strings (>8192 chars) are rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seed | string | Seed supplied to Seeded Holdout Assignment; used only for this bounded calculation and processed in memory without retention. |
| subject | string | Subject supplied to Seeded Holdout Assignment; used only for this bounded calculation and processed in memory without retention. |
| holdout_fraction | number | Holdout Fraction supplied to Seeded Holdout Assignment; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"group": "treatment",
"bucket": 0.5223946972379113
},
"schema": "delx/util-seeded-holdout-assignment/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "bd5b582a9597f6cff6a8c3ed859bd7cf28c6eac4c434b4828c22df3b23d6e4ef",
"external_calls": 0
},
"operation": "seeded_decision:seeded_holdout_assignment"
}
}Tags
x402
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