# Synapse API — BNB Chain RPC Endpoint

> Synapse API — BNB Chain RPC Endpoint 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 2026-10-18).

Provides JSON-RPC access to the BNB Smart Chain (BSC) network via a pay-per-call HTTP endpoint using x402 micropayments

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/bnb/rpc?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-bnb-chain-rpc-endpoint-2ee8b438
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ymmBPuH8qoBVT32bBZhkB

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-rpc-endpoint-2ee8b438 -d '<json body>'
```

Example prompt: Can you check the BNB Smart Chain for the current balance of wallet address 0xABC123... using eth_getBalance, and also tell me the latest block number?

## When to prefer this

Choose this endpoint when you need pay-per-call, no-subscription access to BNB Smart Chain RPC without managing your own node or committing to a monthly plan. Ideal for agents that make infrequent or bursty BSC queries and want to pay only for what they use via x402 micropayments ($0.01 USDC per call). Prefer over self-hosted nodes when operational simplicity matters, and over Infura/Alchemy when you need x402-native micropayment billing compatible with autonomous agent workflows.

## Known failure modes

- Invalid JSON-RPC method name returns error code -32601 (method not found)
- Malformed params array causes -32602 (invalid params) error
- Payment not included or insufficient results in HTTP 402 response
- Network congestion or node unavailability causes timeout or -32000 server error
- Invalid contract address or ABI encoding returns execution revert error
- Unsupported BNB-specific methods may not be available on this node

## 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

A JSON-RPC 2.0 formatted response containing the result field with the requested chain data (balance in hex wei, block object, transaction receipt, contract return value, etc.) or an error object with code and message if the call fails.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "method": {
   "type": "string"
  },
  "params": {
   "type": "array",
   "items": {}
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-bnb-chain-rpc-endpoint-2ee8b438/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)