http

The http Transport connects to a JSON-RPC API via HTTP. Wraps Viem's http Transport.

Import

import { http } from '@wagmi/core'

Usage

import { 
  createConfig, 
  http
} from '@wagmi/core'
import { mainnet, sepolia } from '@wagmi/core/chains'

export const config = createConfig({
  chains: [mainnet, sepolia],
  connectors: [injected()],
  transports: {
    [mainnet.id]: http('https://eth-mainnet.g.alchemy.com/v2/...'), 
    [sepolia.id]: http('https://eth-sepolia.g.alchemy.com/v2/...'), 
  },
})

WARNING

If no URL is provided, then the transport will fall back to a public RPC URL on the chain. It is highly recommended to provide an authenticated RPC URL to prevent rate-limiting.

Batch JSON-RPC

The http Transport supports Batch JSON-RPC. This means that multiple JSON-RPC requests can be sent in a single HTTP request.

The Transport will batch up Actions over a given period and execute them in a single Batch JSON-RPC HTTP request. By default, this period is a zero delay meaning that the batch request will be executed at the end of the current JavaScript message queue. Consumers can specify a custom time period wait (in ms).

You can enable Batch JSON-RPC by setting the batch flag to true:

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...', {
  batch: true
})

Parameters

url

string

URL of the JSON-RPC API. Defaults to chain.rpcUrls.default.http[0].

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...')

batch

boolean | BatchOptions

Toggle to enable Batch JSON-RPC. Defaults to false

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...', {
  batch: true
})

batch.batchSize

number

The maximum number of JSON-RPC requests to send in a batch. Defaults to 1_000.

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...', {
  batch: {
    batchSize: 2_000
  }
})

batch.wait

number

The maximum number of milliseconds to wait before sending a batch. Defaults to 0 (zero delay).

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...', {
  batch: {
    wait: 16
  }
})

fetchOptions

RequestInit

Fetch options to pass to the internal fetch function. Useful for passing auth headers or cache options.

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...', {
  fetchOptions: { 
    headers: {
      'Authorization': 'Bearer ...'
    }
  }
})

key

string

A key for the Transport. Defaults to "http".

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...', {
  key: 'alchemy', 
})

name

string

A name for the Transport. Defaults to "HTTP JSON-RPC".

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...', {
  name: 'Alchemy HTTP Provider', 
})

retryCount

number

The max number of times to retry when a request fails. Defaults to 3.

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...', {
  retryCount: 5, 
})

retryDelay

number

The base delay (in ms) between retries. By default, the Transport will use exponential backoff (~~(1 << count) * retryDelay), which means the time between retries is not constant.

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...', {
  retryDelay: 100, 
})

timeout

number

The timeout for requests. Defaults to 10_000.

const transport = http('https://eth-mainnet.g.alchemy.com/v2/...', {
  timeout: 60_000, 
})