# Delx Seeded Round Robin Start

> Delx Seeded Round Robin Start 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 computes a starting index for a seeded round-robin rotation across a fixed number of members

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/seeded-round-robin-start
- 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-round-robin-start-aba85c2d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2ry9QdaD9aZik2DtjAN5w

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-round-robin-start-aba85c2d -d '<json body>'
```

Example prompt: Using seed 'batch-job-2024-05-20' and 7 members, compute the starting index for a seeded round-robin rotation.

## When to prefer this

Use this endpoint when you need a deterministic, reproducible starting position in a round-robin rotation derived from a seed string — such as distributing tasks, rotating API replicas, or seeding scheduler offsets. Prefer this over a random start when reproducibility across runs matters. It operates entirely in-memory with no data retention, making it safe for sensitive seed values.

## Known failure modes

- Missing or empty seed results in validation error
- member_count of zero or negative triggers an error response
- Extremely long seed strings (near 8192 char limit) may be rejected
- Malformed JSON body returns 400-level error
- Non-integer member_count causes schema validation failure

## How this service works

Seeded Round Robin Start: Seeded Round Robin Start chooses a reproducible starting index for round-robin rotation from bounded caller-supplied values without an external provider. Call Seeded Round Robin Start 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 Round Robin Start as versioned deterministic JSON. Price: $0.001 USDC via x402…

## Output

Returns a JSON object with a start_index (the computed zero-based position to begin the round-robin) and the member_count confirming the pool size, along with a schema identifier, pass/fail status, and an evidence block confirming no external calls were made and inputs were not retained.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "seed": {
   "type": "string",
   "maxLength": 8192,
   "description": "Seed supplied to Seeded Round Robin Start; used only for this bounded calculation and processed in memory without retention."
  },
  "member_count": {
   "type": "integer",
   "description": "Member Count supplied to Seeded Round Robin Start; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "start_index": 4,
   "member_count": 7
  },
  "schema": "delx/util-seeded-round-robin-start/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "40cb4e4bb3e1dab089d71313a59ec0aa2f02317e2e48c56a5e4981cc84c221f5",
   "external_calls": 0
  },
  "operation": "seeded_decision:seeded_round_robin_start"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-seeded-round-robin-start-aba85c2d/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)