# Synapse API — Base Token Metadata Lookup

> Synapse API — Base 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 2026-10-10).

Fetches on-chain token metadata (name, symbol, decimals, etc.) for a given ERC-20 or similar contract address on the Base blockchain network.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/base/token/metadata?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-base-token-metadata-lookup-754b57f4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1MxZ2Sz7ErTqRGS-A6mx0

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-base-token-metadata-lookup-754b57f4 -d '<json body>'
```

Example prompt: Can you pull the token metadata — name, symbol, and decimals — for the contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base?

## When to prefer this

Use this endpoint when you need fast, pay-per-call resolution of token metadata on the Base blockchain specifically, without needing to run your own node or maintain an API key with a traditional provider. Ideal for agents that only occasionally need token lookups and want to avoid subscription costs.

## Known failure modes

- Invalid or malformed contract address returns an error
- Contract address exists but is not a token contract (e.g. a plain EOA or non-ERC20 contract) may return empty or error
- Network congestion or RPC issues may cause timeouts
- Non-Base network addresses will not return correct metadata
- Payment failure via x402 protocol blocks the 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 on-chain metadata for the specified token contract on the Base network, typically including token name, symbol, number of decimals, and potentially total supply or other contract-level fields.

## 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-base-token-metadata-lookup-754b57f4/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)