# Sovereign Engine KV Store

> Sovereign Engine KV Store is a paid API for AI agents from api.zuluworksai.com, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Persistent key-value storage primitive accessible via pay-per-call x402 micropayment on Base (USDC)

## Facts

- Endpoint: POST https://api.zuluworksai.com/exec/kv-store
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sovereign-engine-kv-store-d8a1bd65
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7EjILW7OrKkSdoC3Cmw4_

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 sovereign-engine-kv-store-d8a1bd65 -d '<json body>'
```

Example prompt: Store the value 'session_token_abc123' under the key 'user_session_42' in the Sovereign Engine KV store — I want to retrieve it later in my workflow.

## When to prefer this

Choose this endpoint when your agent needs lightweight, ephemeral or persistent key-value storage on a true pay-per-call basis with no subscription, and you are already operating within the x402/Base USDC micropayment ecosystem. Ideal for stateless agent workflows that need to persist small data blobs between steps without provisioning a full database.

## Known failure modes

- Payment failure or insufficient USDC balance returns 402 Payment Required
- Malformed prompt or missing input returns 400 Bad Request
- Key not found on retrieval returns empty data object with success: false
- Rate limiting or quota exceeded returns 429 Too Many Requests
- Cloudflare Workers KV unavailability returns 503 Service Unavailable

## How this service works

Pay-per-call x402 execution primitives (USDC on Base). Code execution runs in isolated Cloudflare Dynamic Worker sandboxes (JavaScript + Python, network blocked). Web search backed by Bing RSS. Self-hosted facilitator.

## Output

Returns a JSON object with a 'data' field containing the stored or retrieved value, a 'success' boolean indicating whether the operation succeeded, and a 'receipt_id' UUID confirming the paid transaction.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "prompt": {
   "type": "string",
   "description": "The input prompt"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "success": true,
  "receipt_id": "uuid"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sovereign-engine-kv-store-d8a1bd65/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.zuluworksai.com](https://www.zero.xyz/host/api.zuluworksai.com/llms.txt)