# Delx Commerce — Seeded Rendezvous Rank

> Delx Commerce — Seeded Rendezvous Rank is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Deterministically ranks and selects a node from a list using a seeded rendezvous (HRW) hashing algorithm, returning a ranked list with cryptographic scores.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/seeded-rendezvous-rank?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-seeded-rendezvous-rank-c21571e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_j7rkJLieaD0Gm0bWe3yTE

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-rendezvous-rank-c21571e3 -d '<json body>'
```

Example prompt: Use seeded rendezvous ranking to pick which node handles the key 'task-42' — seed it with 'deploy-round-7' and rank these three nodes: worker-A, worker-B, worker-C.

## When to prefer this

Choose this endpoint when you need deterministic, reproducible node selection with cryptographic evidence of the decision — particularly in distributed systems where consistent hashing, verifiable audit trails, or agent-fleet routing are required. Prefer it over random selection when reproducibility across runs matters, and over custom HRW implementations when you want a pay-per-call, no-infrastructure, verifiable result with no data retention guarantees baked in.

## Known failure modes

- Empty nodes array returns no selection
- Exceeding 256 nodes limit returns a validation error
- Malformed input types (non-string key or seed) cause schema rejection
- Missing required fields may result in a 400 or incomplete response
- Payment failure (x402) blocks execution before computation begins

## 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 top-selected node, a full ranked list of all nodes each with a deterministic hex score, plus an evidence block containing the SHA-256 of the inputs, a flag confirming no data was retained, and a count of zero external calls — enabling verifiable, auditable decisions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "key": {
   "type": "string",
   "maxLength": 8192,
   "description": "Key supplied to Seeded Rendezvous Rank; used only for this bounded calculation and processed in memory without retention."
  },
  "seed": {
   "type": "string",
   "maxLength": 8192,
   "description": "Seed supplied to Seeded Rendezvous Rank; used only for this bounded calculation and processed in memory without retention."
  },
  "nodes": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 8192
   },
   "maxItems": 256,
   "description": "Nodes supplied to Seeded Rendezvous Rank; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "selected": "n2",
   "ranked_nodes": [
    {
     "node": "n2",
     "score": "bd039453c0ba9edb4613bcc40672868b77523fa05df3607d1284201813691a3e"
    },
    {
     "node": "n1",
     "score": "444f37c2bc2a0abc09cffc79afebfd08a086442085bfb9f26fa31b239deaca4b"
    },
    {
     "node": "n3",
     "score": "17909b5cada1fd90f21c1c871bf21f5be354a535f741ad9ea9879a42922989f9"
    }
   ]
  },
  "schema": "delx/util-seeded-rendezvous-rank/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "3351b84ac1d977aa3f2c82a51fd28b618a255b972578172462ff51b4c20cf1b2",
   "external_calls": 0
  },
  "operation": "seeded_decision:seeded_rendezvous_rank"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-seeded-rendezvous-rank-c21571e3/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)