# Delx Seeded Canary Sequence

> Delx Seeded Canary Sequence is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).

Deterministically assigns subjects to staged groups using a seed, producing a reproducible canary/rollout sequence with no data retention.

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/seeded-canary-sequence?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-seeded-canary-sequence-af535572
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VTbmx0oUJVBXhrU73WW1S

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-canary-sequence-af535572 -d '<json body>'
```

Example prompt: Using the seeded canary sequence, assign these 5 services — ['s1','s2','s3','s4','s5'] — to rollout stages of sizes [1,1,2] using the seed 'launch-2024', so I can do a controlled staged rollout.

## When to prefer this

Choose this endpoint when you need fully deterministic, reproducible partitioning of a subject list into ordered stages — particularly for canary rollouts, phased deployments, or A/B test assignments where the same seed must always produce the same grouping. Prefer it over random shufflers or stateful assignment services when auditability (via SHA-256 evidence hash) and zero data retention are required. It is purpose-built for agent workflows that need staged sequencing without side effects.

## Known failure modes

- Seed exceeds 8192 character limit — request rejected
- Subjects array exceeds 256 items — request rejected
- Stage sizes array exceeds 256 entries — request rejected
- Stage sizes sum exceeds number of subjects — some subjects left unassigned (returned in 'unassigned' field)
- Malformed JSON body — HTTP 400 error
- Payment not provided or insufficient USDC — HTTP 402 error

## How this service works

Seeded Canary Sequence: Seeded Canary Sequence orders subjects reproducibly for a staged canary rollout from bounded caller-supplied values without an external provider. Call Seeded Canary Sequence 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 Canary Sequence as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First…

## Output

Returns a JSON object with a 'stages' array where each element is a list of subjects assigned to that stage in order, an 'unassigned' array for any overflow, an evidence block containing an input SHA-256 hash and confirmation of no data retention or external calls, plus operation metadata and a pass/fail status.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "seed": {
   "type": "string",
   "maxLength": 8192,
   "description": "Seed supplied to Seeded Canary Sequence; used only for this bounded calculation and processed in memory without retention."
  },
  "subjects": {
   "type": "array",
   "items": {
    "type": "string",
    "maxLength": 8192
   },
   "maxItems": 256,
   "description": "Subjects supplied to Seeded Canary Sequence; used only for this bounded calculation and processed in memory without retention."
  },
  "stage_sizes": {
   "type": "array",
   "items": {
    "type": "integer"
   },
   "maxItems": 256,
   "description": "Stage Sizes supplied to Seeded Canary Sequence; used only for this bounded calculation and processed in memory without retention."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {
   "stages": [
    [
     "s3"
    ],
    [
     "s2"
    ],
    [
     "s4",
     "s1"
    ]
   ],
   "unassigned": []
  },
  "schema": "delx/util-seeded-canary-sequence/v1",
  "status": "pass",
  "evidence": {
   "retained": false,
   "input_sha256": "b7c4baf8edc708c4cf95b7a38dca0834e87950d8893128fa9f9eccacac92ccce",
   "external_calls": 0
  },
  "operation": "seeded_decision:seeded_canary_sequence"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-seeded-canary-sequence-af535572/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)