opBNB

opBNB

API Overview

Architecture

TheRPC API follows JSON-RPC 2.0 specification and provides:

• Standard HTTP and WebSocket endpoints
• Authentication via API keys
• Unified response formats
• Cross-network compatibility

Communication Protocols

HTTP Endpoints

Best for single requests and simple integrations. See examples in our HTTP/Curl guide.

https://YOUR_API_ENDPOINT

WebSocket Endpoints

Ideal for subscriptions and real-time data. See eth_subscribe for subscription examples.

wss://YOUR_API_ENDPOINT

JSON-RPC Format

Request Structure

All API calls follow the JSON-RPC 2.0 format. See complete examples in our Basic Operations guide:

1{
2	"jsonrpc": "2.0",
3	"method": "eth_blockNumber",
4	"params": [],
5	"id": 1
6}

Required fields:

• jsonrpc: Version identifier (always "2.0")
• method: The RPC method to call (see Available Methods)
• params: Array of parameters (can be empty)
• id: Request identifier

Response Format

All responses follow a consistent structure:

1{
2	"jsonrpc": "2.0",
3	"id": 1,
4	"result": "0x..."
5}

Or in case of error:

1{
2	"jsonrpc": "2.0",
3	"id": 1,
4	"error": {
5		"code": -32600,
6		"message": "Invalid Request"
7	}
8}

Authentication

All requests require an API key in the Authorization header. See our Authentication guide for detailed setup:

1Authorization: Bearer YOUR_API_KEY

Method Categories

Standard Methods

• eth_: Ethereum protocol methods (eth_blockNumber, eth_getBalance, etc.)
• net_: Network status methods (net_version)
• web3_: Web3 utility methods (web3_clientVersion)

Advanced Methods

• debug_: Debugging capabilities (debug_traceTransaction)
• trace_: Transaction tracing (trace_transaction)
• txpool_: Transaction pool information (txpool_status)

Error Handling

Common error codes (see FAQ for detailed error handling strategies):

• -32700: Parse error
• -32600: Invalid request
• -32601: Method not found
• -32602: Invalid params
• -32603: Internal error

Implementation Examples

For practical implementation examples, check our language-specific guides:

• JavaScript/TypeScript Guide
• Python Guide
• HTTP/Curl Examples
• View all available SDKs in our Tools & SDKs section

Rate Limits

For information about request limits and quotas, see our Rate Limits documentation.

See Also

• Authentication Guide - Detailed Auth Info
• Available Methods - Complete Method List
• Basic Operations - Common Usage Patterns
• FAQ - Common Questions and Answers