# Synapse API — Token Metadata Lookup

> Synapse API — 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 2026-09-14).

Retrieves on-chain token metadata (name, symbol, decimals, supply, etc.) for a given smart contract address across 57+ blockchain networks.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/stable/token/metadata
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-token-metadata-lookup-4da765c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fgeCTT-gRTeGurBgVDqfm

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-token-metadata-lookup-4da765c4 -d '<json body>'
```

Example prompt: Can you look up the token metadata — name, symbol, decimals, and total supply — for the contract address 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48?

## When to prefer this

Choose this endpoint when you need quick, pay-per-call token metadata lookup without a subscription, especially across a broad range of blockchain networks. Ideal for agents that need on-demand token resolution for DeFi workflows, portfolio tracking, or pre-trade validation without maintaining a dedicated indexer.

## Known failure modes

- Invalid or malformed contract address returns an error
- Contract address exists but is not a token contract (e.g. a plain wallet or non-ERC20 contract)
- Network not supported among the 57+ chains returns an unsupported network error
- Payment failure via x402 protocol prevents request from processing
- Rate limits or server errors on the Vercel deployment cause timeouts

## 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 structured token metadata for the given contract address, including fields such as token name, ticker symbol, number of decimals, total supply, and potentially additional on-chain attributes. Response is scoped to the specific contract queried.

## 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-token-metadata-lookup-4da765c4/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)