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Delx Seeded Holdout Assignment
x402
Delx Seeded Holdout Assignment is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Deterministically assigns a subject to a treatment or holdout group using a seed, returning a stable group label and bucket value based on a configurable holdout fraction.
Price / call$0.001
Success—
StatusUnknown
How this service works
Seeded Holdout Assignment: Seeded Holdout Assignment assigns a stable subject to holdout or treatment from bounded caller-supplied values without an external provider. Call Seeded Holdout 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 Holdout Assignment as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. F…
Output
Returns a JSON object with a 'group' field ('treatment' or 'holdout'), a numeric 'bucket' value (0–1) reflecting the deterministic hash position, the schema version, a 'status' of 'pass', and evidence metadata including whether data was retained (always false), the SHA-256 of the input, and the number of external calls made (always 0).
Example use cases
Gradual feature rollout gating
“I'm rolling out a new checkout flow to 80% of users — can you assign user 'acct_77123' to treatment or holdout using seed 'checkout_rollout_q3' with a holdout fraction of 0.2?”
Reproducible A/B test assignment
“For our email subject line experiment, assign customer 'cust_abc456' to a group using seed 'email_ab_oct' and a 50% holdout fraction so we can consistently know which variant they're in.”
Agent self-gating on new capability
“Before using the new search strategy, check if session 'sess_x9q2' falls in the holdout group — use seed 'agent_search_exp' and a holdout fraction of 0.1 so only 10% of sessions skip the new behavior.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/seeded-holdout-assignmentWhen to prefer
Use this endpoint when you need a stateless, reproducible, privacy-safe way to assign subjects to holdout vs. treatment groups without storing assignment state. Ideal for agent workflows that must make consistent branching decisions across calls using only a seed and subject identifier. Prefer this over random assignment when repeatability matters, and over stateful systems when you want zero data retention guarantees.
Side effects
- Missing required fields (seed, subject, holdout_fraction) result in a validation error
- holdout_fraction outside the 0–1 range may cause unexpected behavior or an error
- Overly long seed or subject strings (beyond 8192 chars) will be rejected
- Payment failure via x402 protocol will prevent the call from being processed
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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