# Synapse API — BNB Chain Transaction History

> Synapse API — BNB Chain Transaction History 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 paginated transaction history for addresses on the BNB (Binance Smart Chain) blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/bnb/tx/history
- 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-chain-transaction-history-0e8d9b18
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VMPM60FacoOKGQz4p4dsO

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-chain-transaction-history-0e8d9b18 -d '<json body>'
```

Example prompt: Pull the last 50 transactions for BNB wallet address 0xABC...123, sorted descending, including metadata and excluding zero-value transfers.

## When to prefer this

Choose this endpoint when you need on-chain transaction history specifically for the BNB (Binance Smart Chain) network with flexible filtering by address, block range, category, and pagination support. Prefer it over generic blockchain explorers when you need programmatic, pay-per-call access with structured JSON output and metadata enrichment.

## Known failure modes

- Invalid or malformed address returns 400 error
- Non-existent block range returns empty result set
- Exceeding maxCount limits may truncate results
- Invalid pageKey causes pagination error
- Unsupported category value returns validation error
- Payment failure via x402 blocks the request with 402 status

## 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 paginated list of asset transfers and transactions on BNB Chain matching the specified address filters, block range, and category criteria. Each record typically includes transaction hash, block number, from/to addresses, asset type, value, and optional metadata such as token name and decimals.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "order": {
   "enum": [
    "asc",
    "desc"
   ],
   "type": "string"
  },
  "pageKey": {
   "type": "string"
  },
  "toBlock": {
   "type": "string"
  },
  "category": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "maxCount": {
   "type": "number"
  },
  "fromBlock": {
   "type": "string"
  },
  "toAddress": {
   "type": "string"
  },
  "fromAddress": {
   "type": "string"
  },
  "withMetadata": {
   "type": "boolean"
  },
  "excludeZeroValue": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-bnb-chain-transaction-history-0e8d9b18/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)