# Synapse API — zkSync Token Metadata Lookup

> Synapse API — zkSync Token Metadata Lookup is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-18).

Fetches token metadata (name, symbol, decimals, etc.) for a given contract address on the zkSync blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/zksync/token/metadata?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-zksync-token-metadata-lookup-427d0f7c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TYgudAKAA0Z8pCUnCJdco

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 synapse-api-zksync-token-metadata-lookup-427d0f7c -d '<json body>'
```

Example prompt: What token is deployed at zkSync contract address 0x3355df6D4c9C3035724Fd0e3914dE96A5a83aaf4? Give me its name, symbol, and decimals.

## When to prefer this

Choose this endpoint when you specifically need token metadata from the zkSync (Era) Layer 2 network. It is ideal for DeFi agents enriching portfolio data, pre-swap validation workflows, or any pipeline that needs to resolve a raw zkSync contract address into human-readable token information without setting up your own blockchain node.

## Known failure modes

- Invalid or malformed contract address returns an error
- Contract address exists but is not a token contract (no ERC-20 metadata) returns empty or error
- Contract not deployed on zkSync returns not found error
- Network or RPC availability issues may cause timeouts
- Payment failure (insufficient USDC) blocks request

## How this service works

High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.

## Output

Returns token metadata for the specified zkSync contract address, including the token name, symbol, decimals, and potentially other on-chain metadata fields associated with the ERC-20 or similar token standard.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "contractAddress": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-zksync-token-metadata-lookup-427d0f7c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from synapse-api-brown.vercel.app](https://www.zero.xyz/host/synapse-api-brown.vercel.app/llms.txt)