# Delx Seeded Rendezvous Rank

> Delx Seeded Rendezvous Rank 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).

Ranks a list of nodes by deterministic seeded rendezvous hashing to consistently select and order nodes given a key and seed.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/seeded-rendezvous-rank
- 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-rendezvous-rank-ecdf5e62
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZKTVS9zHyYLfeMO4YeyEI

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-rendezvous-rank-ecdf5e62 -d '<json body>'
```

Example prompt: I have a list of nodes ['n1', 'n2', 'n3'] and need to deterministically pick which one should handle the key 'user-42' — use seeded rendezvous ranking with seed 'myseed2024' and give me the full ranked order.

## When to prefer this

Choose this endpoint when you need deterministic, reproducible node selection or ranking given a key and seed — ideal for consistent hashing, sharding, load balancing, or task routing where the same key must always map to the same node. Prefer over random selection when reproducibility and coordination-free routing matter. Use when privacy is important, as inputs are processed in memory with no retention.

## Known failure modes

- Empty nodes array returns no selection
- Nodes or key exceeding 8192 character limit rejected
- More than 256 nodes in array rejected
- Missing required fields (key, seed, nodes) may cause validation error
- Payment failure (402) if USDC balance insufficient

## How this service works

Seeded Rendezvous Rank: Seeded Rendezvous Rank ranks nodes for a key using reproducible rendezvous hashing from bounded caller-supplied values without an external provider. Call Seeded Rendezvous Rank 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 Rendezvous Rank as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. Fi…

## Output

Returns the top-selected node, a full ranked list of all nodes each with their deterministic rendezvous hash score, plus evidence metadata including whether any data was retained (always false), the input SHA-256 hash, and number of external calls made (always zero).

## 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-seeded-rendezvous-rank-ecdf5e62/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)