# Delx Seeded Tie Break

> Delx Seeded Tie Break 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 selects one candidate from a list using a seed string, breaking ties or making seeded decisions reproducibly.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/seeded-tie-break
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-seeded-tie-break-e30b05c2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NRICMtdpWNhZVk93Tc9Ka

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-tie-break-e30b05c2 -d '<json body>'
```

Example prompt: I need to break a tie between these three agents — 'agent-a', 'agent-b', 'agent-c' — use the seed 'round-2-finals' to pick one deterministically.

## When to prefer this

Use this endpoint when you need a deterministic, reproducible, auditable tie-break or seeded selection from a bounded list of candidates — particularly when the same seed must always produce the same winner, external randomness is untrustworthy, or you need an evidence hash for audit trails. Prefer it over random selection when reproducibility matters, and over hash-based selection when you want a managed, governed API call with a verifiable evidence block.

## Known failure modes

- Empty candidates array returns an error or undefined behavior
- Seed exceeds 8192 character limit returns a validation error
- Candidates array exceeds 256 items returns a payload rejection
- Malformed JSON body returns a 400 bad request
- Network timeout on the POST returns no result

## How this service works

Seeded Tie Break: Seeded Tie Break breaks a tie reproducibly among equally scored candidates from bounded caller-supplied values without an external provider. Call Seeded Tie Break 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 Tie Break as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memo…

## Output

Returns a JSON object with the selected candidate string, its zero-based index in the input array, a status of 'pass', the operation name, and an evidence block confirming no data was retained and no external calls were made, plus a SHA-256 hash of the input for auditability.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "seed": {
   "type": "string",
   "maxLength": 8192,
   "description": "Seed supplied to Seeded Tie Break; used only for this bounded calculation and processed in memory without retention."
  },
  "candidates": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 8192
   },
   "maxItems": 256,
   "description": "Candidates supplied to Seeded Tie Break; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "index": 1,
   "selected": "agent-b"
  },
  "schema": "delx/util-seeded-tie-break/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "2af40d10ca5c00077ce59778ecab5e4435550298c2af584fa9395592d9a9208c",
   "external_calls": 0
  },
  "operation": "seeded_decision:seeded_tie_break"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-seeded-tie-break-e30b05c2/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)