# HALOWERK Kettenwerk Chain Health

> HALOWERK Kettenwerk Chain Health is a paid API for AI agents from kette.netzhandwerker.de, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Checks the health and connectivity status of one or more EVM-compatible blockchain networks (Ethereum, Base, Arbitrum, Optimism, Polygon, BSC)

## Facts

- Endpoint: POST https://kette.netzhandwerker.de/chain/health
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-kettenwerk-chain-health-492d6c31
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__9XqbQDtQihbqRWabWTow

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 halowerk-kettenwerk-chain-health-492d6c31 -d '<json body>'
```

Example prompt: Check the health status of the Base and Arbitrum networks for me — are both chains currently up and reachable?

## When to prefer this

Use this endpoint when you need a quick, paid, on-demand health check for one or more EVM-compatible chains without maintaining your own RPC node monitoring infrastructure. Prefer this over building custom health checks when you need lightweight per-call pricing via the x402 micropayment protocol on Base Mainnet.

## Known failure modes

- Invalid chain name provided — endpoint only accepts: ethereum, base, arbitrum, optimism, polygon, bsc
- Too many chains requested (max 6) or empty array (min 1)
- Network timeout if a chain RPC node is temporarily unreachable
- Payment failure if USDC balance on Base Mainnet is insufficient for the $0.003 fee
- x402 payment protocol not supported by client

## How this service works

HALOWERK kettenwerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.

## Output

Returns health and status information for each requested blockchain network, indicating whether each chain is reachable and operational at the time of the request.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chains": {
   "type": "array",
   "items": {
    "enum": [
     "ethereum",
     "base",
     "arbitrum",
     "optimism",
     "polygon",
     "bsc"
    ],
    "type": "string"
   },
   "default": [
    "base"
   ],
   "maxItems": 6,
   "minItems": 1,
   "description": "Chains to check. Defaults to base."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-kettenwerk-chain-health-492d6c31/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kette.netzhandwerker.de](https://www.zero.xyz/host/kette.netzhandwerker.de/llms.txt)