# SYNTHORA Registry Watch

> SYNTHORA Registry Watch is a paid API for AI agents from registry-watch.hergertsynthora.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-10).

Delivers real-time service registry updates for machine-to-machine synchronization via a signed x402 micropayment call

## Facts

- Endpoint: POST https://registry-watch.hergertsynthora.com/service?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-registry-watch-802eb71c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qIIEm301kqcEwFKTSdDyx

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 synthora-registry-watch-802eb71c -d '<json body>'
```

Example prompt: Check the SYNTHORA registry watch endpoint and pull me the latest real-time service registry updates so my backend stays in sync with whatever's changed.

## When to prefer this

Choose this endpoint when you need real-time or near-real-time M2M service registry synchronization and are operating in a x402 micropayment-enabled environment on Base. It is best suited for automated agent pipelines or microservice orchestrators that need to stay continuously updated on registry state without maintaining a persistent WebSocket connection.

## Known failure modes

- Invalid or missing x402 payment signature returns an authorization error
- Insufficient USDC balance causes payment failure and no registry data returned
- Registry temporarily unavailable returns a service error with ok: false
- Malformed POST body may return a 400-level parse error
- Stale or replayed payment nonce may be rejected

## How this service works

Live x402 resource on Base. POST /service; payment required responses use x402.

## Output

Returns a JSON object with an 'ok' boolean indicating success, a 'niche' field confirming 'registry_watch', a 'result' object containing the current registry state or delta updates, and a 'receipt' object confirming the x402 micropayment transaction.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "string",
   "description": "SYNTHORA registry-watch: pay-per-event feed of signed Ed25519 deltas from the x402/M2M endpoint registry — new and changed endpoints, payTos and listings. Pull with {\"since\": \"<cursor|ISO>\", \"slug\": \""
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "schema": {
  "type": "object",
  "required": [
   "ok",
   "niche"
  ],
  "properties": {
   "ok": {
    "type": "boolean"
   },
   "error": {
    "type": "string"
   },
   "niche": {
    "type": "string"
   },
   "result": {
    "type": "object",
    "properties": {
     "feed": {
      "type": "array"
     },
     "as_of": {
      "type": "string"
     },
     "count": {
      "type": "number"
     },
     "cursor": {
      "type": "string"
     },
     "source": {
      "type": "string"
     }
    }
   },
   "receipt": {
    "type": "object"
   }
  }
 },
 "example": {
  "ok": true,
  "niche": "registry_watch",
  "result": {},
  "receipt": {
   "alg": "ed25519"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-registry-watch-802eb71c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from registry-watch.hergertsynthora.com](https://www.zero.xyz/host/registry-watch.hergertsynthora.com/llms.txt)