# HALOWERK marktwerk Token Lookup

> HALOWERK marktwerk Token Lookup is a paid API for AI agents from markt.netzhandwerker.de, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).

Looks up on-chain token metadata and market data by contract address or symbol across EVM and non-EVM chains

## Facts

- Endpoint: POST https://markt.netzhandwerker.de/token
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-marktwerk-token-lookup-cc051d6e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tU2uAUY_H0Y_0qP4KI3x9

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-marktwerk-token-lookup-cc051d6e -d '<json body>'
```

Example prompt: Can you look up the token info for the contract address 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984 on Ethereum?

## When to prefer this

Choose this endpoint when you need to resolve on-chain token metadata by contract address or by one of a small set of globally unambiguous symbols (BTC, ETH, SOL, etc.) across multiple chains including EVM chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BSC) and non-EVM chains. It is well-suited for DeFi agent workflows that need to enrich token data at $0.002 USDC per call via x402 micropayments. Prefer this over generic crypto data APIs when you need per-address resolution in an autonomous payment-enabled agent pipeline.

## Known failure modes

- 400 returned if an ambiguous or unsupported symbol is provided (only globally unambiguous symbols like BTC, ETH, SOL, etc. are accepted)
- 400 returned if both address and symbol are missing or if the chain key is invalid
- 402 Payment Required if x402 micropayment is not included or is insufficient
- 404 if the token contract address is not found on the specified chain
- Invalid address format (not matching 0x hex pattern or valid non-EVM mint address) results in validation error

## How this service works

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

## Output

Returns token metadata and market data for the specified token, including details such as name, symbol, decimals, and potentially price or market information, keyed by the provided contract address or globally recognized symbol across the specified chain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "default": "base",
   "pattern": "^[a-z0-9_-]{2,24}$",
   "description": "Chain key of the source, for example ethereum, base, arbitrum, optimism, polygon, bsc. Required together with address."
  },
  "symbol": {
   "type": "string",
   "pattern": "^[A-Za-z0-9]{2,10}$",
   "description": "Alternative to address, only for globally unambiguous symbols: BTC, ETH, SOL, BNB, XRP, ADA, AVAX, DOT, MATIC, LINK, UNI, AAVE, DOGE, LTC, ATOM. Anything else is refused with 400."
  },
  "address": {
   "type": "string",
   "pattern": "^(0x[a-fA-F0-9]{40}|[A-Za-z0-9]{32,44})$",
   "description": "Contract address of the token. EVM address as 0x with 40 hex digits, or the mint address on non EVM chains."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-marktwerk-token-lookup-cc051d6e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from markt.netzhandwerker.de](https://www.zero.xyz/host/markt.netzhandwerker.de/llms.txt)