# BNB Chain Token Balance Lookup

> BNB Chain Token Balance 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).

Returns token balances for a given wallet address across specified BEP-20 contract addresses on BNB Chain

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/bnb/token/balances
- 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/bnb-chain-token-balance-lookup-24ff51cb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gVWePAXdSLa0zO-v0EuA3

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 bnb-chain-token-balance-lookup-24ff51cb -d '<json body>'
```

Example prompt: What are the BEP-20 token balances for wallet 0xAbC...123 on BNB Chain for contract addresses 0xToken1 and 0xToken2?

## When to prefer this

Use this endpoint when you need to look up BEP-20 token balances on BNB Chain (BSC) for a specific wallet across one or more token contracts. Prefer this over generic blockchain explorers when you need programmatic, pay-per-call access without API key management, or when building automated DeFi portfolio tools that pay via x402/USDC.

## Known failure modes

- Invalid or malformed wallet address returns error
- Non-existent or invalid contract address may return zero balance or error
- Missing required 'owner' field causes validation error
- Rate limiting or payment failure via x402 protocol returns 402 status
- Network or RPC issues on BNB Chain may cause timeout or unavailability

## 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 a list of token balances for the specified owner wallet across the given BEP-20 contract addresses on BNB Chain, including token amounts per contract.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "owner": {
   "type": "string"
  },
  "contractAddresses": {
   "type": "array",
   "items": {
    "type": "string"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bnb-chain-token-balance-lookup-24ff51cb/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)