# Delx Commerce Seeded Tie-Break

> Delx Commerce Seeded Tie-Break 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 selects one candidate from a list using a seed string, producing a verifiable, reproducible tie-breaking decision with no data retention.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/seeded-tie-break?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-seeded-tie-break-90981666
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qT0Ih545MiSfDebohUXs9

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-commerce-seeded-tie-break-90981666 -d '<json body>'
```

Example prompt: Break the tie between 'agent-a', 'agent-b', and 'agent-c' using the seed 'round-3-2024' — I need a reproducible, verifiable pick with no data stored.

## When to prefer this

Choose this endpoint when you need a deterministic, reproducible, and auditable tie-breaking decision with a verifiable seed — particularly in multi-agent systems where the same seed must always yield the same winner, or when auditability and no-retention guarantees are required. Prefer it over pure random selection when you need reproducibility, and over self-implemented hash logic when you need an external, pay-per-result verifiable record.

## Known failure modes

- Missing or empty candidates array returns a validation error
- Seed string exceeding 8192 characters is rejected
- Candidates array exceeding 256 items is rejected
- Malformed JSON body returns a 400-level error
- Payment not included or insufficient USDC results in a 402 response

## 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 with the selected candidate string and its index in the input array, plus an evidence block containing the input SHA-256 hash, a flag confirming no data was retained, and an external-calls count of zero — enabling full auditability of the decision.

## 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-commerce-seeded-tie-break-90981666/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from commerce.delx.ai](https://www.zero.xyz/host/commerce.delx.ai/llms.txt)