# Delx Seeded Percentage Rollout

> Delx Seeded Percentage Rollout 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 decides whether a subject is included in a percentage rollout based on a seed and percentage threshold, returning a boolean result and bucket value.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/seeded-percentage-rollout
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-seeded-percentage-rollout-b6d5074c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_flQCI1QH_Fd0TM-bZX5lM

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability delx-seeded-percentage-rollout-b6d5074c -d '<json body>'
```

Example prompt: Check whether user ID 'user_8821' is included in the 'beta-dashboard' feature rollout set at 25% — use 'beta-dashboard' as the seed and 'user_8821' as the subject.

## When to prefer this

Choose this endpoint when you need a deterministic, reproducible bucketing decision for feature flags, A/B tests, or gradual rollouts — especially when you need auditability (SHA-256 evidence) and a guarantee that no input data is retained. Prefer this over a random number approach when you need the same subject to always land in the same bucket for a given seed, or when you need a lightweight, stateless computation without managing your own hashing logic.

## Known failure modes

- Missing required fields (seed, subject, or percentage) return a validation error
- Percentage value out of 0–100 range may return an error or unexpected behavior
- Network timeout or service unavailability returns a connection error
- Invalid data types (e.g. non-numeric percentage) cause schema validation failure

## How this service works

Seeded Percentage Rollout: Seeded Percentage Rollout evaluates stable inclusion in a percentage rollout from bounded caller-supplied values without an external provider. Call Seeded Percentage Rollout 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 Percentage Rollout as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base.…

## Output

Returns a JSON object with an 'included' boolean indicating whether the subject falls within the specified percentage, a 'bucket_percent' float showing the subject's computed bucket value, an operation name, a schema version, a status field ('pass'), and evidence including input SHA-256 hash, a 'retained: false' flag confirming no data is stored, and an external_calls count.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "seed": {
   "type": "string",
   "maxLength": 8192,
   "description": "Seed supplied to Seeded Percentage Rollout; used only for this bounded calculation and processed in memory without retention."
  },
  "subject": {
   "type": "string",
   "maxLength": 8192,
   "description": "Subject supplied to Seeded Percentage Rollout; used only for this bounded calculation and processed in memory without retention."
  },
  "percentage": {
   "type": "number",
   "description": "Percentage supplied to Seeded Percentage Rollout; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "included": false,
   "bucket_percent": 18.47354188710196
  },
  "schema": "delx/util-seeded-percentage-rollout/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "81678a13647db7a4f1b151b8288397c3c5f872a52bed79342f44fc6eb2ea00fe",
   "external_calls": 0
  },
  "operation": "seeded_decision:seeded_percentage_rollout"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-seeded-percentage-rollout-b6d5074c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)