# Synapse API — BNB Token Transfers Lookup

> Synapse API — BNB Token Transfers 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 token transfer history for a given wallet address on the BNB (BNB Chain) blockchain, with filtering by block range, contract addresses, and pagination.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/bnb/token/transfers
- 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-bnb-token-transfers-lookup-f4aa459f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ITzMYmpbSt97WITibzeP1

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-bnb-token-transfers-lookup-f4aa459f -d '<json body>'
```

Example prompt: Pull all token transfers for BNB wallet 0xAbC123...def456 between blocks 30000000 and 31000000, sorted ascending, up to 100 results — only for contract 0xTokenContract...789.

## When to prefer this

Use this endpoint when you need on-chain token transfer history specifically for BNB Chain (BNB Smart Chain) addresses, especially when you need block-level filtering, multi-contract filtering, or paginated access to large transfer histories. Prefer this over generic blockchain explorers when you need programmatic, structured JSON output for agent workflows.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty result
- Non-existent contract address in contractAddresses array yields no transfers
- fromBlock greater than toBlock returns an error or empty set
- Invalid pageKey causes pagination failure
- Rate or quota issues may return payment-related errors (x402)
- Blocks out of range for BNB Chain history return empty results

## 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 transfer events for the specified BNB Chain wallet, including sender, recipient, token contract address, amount, block number, and transaction hash. Supports pagination via a page key for large result sets.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "order": {
   "enum": [
    "asc",
    "desc"
   ],
   "type": "string"
  },
  "owner": {
   "type": "string"
  },
  "pageKey": {
   "type": "string"
  },
  "toBlock": {
   "type": "string"
  },
  "maxCount": {
   "type": "number"
  },
  "fromBlock": {
   "type": "string"
  },
  "contractAddresses": {
   "type": "array",
   "items": {
    "type": "string"
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-bnb-token-transfers-lookup-f4aa459f/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)