docs: update migration docs after alchemy transport

site/pages/core/multi-chain-apps.mdx

@@ -13,10 +13,11 @@ In order to support multiple chains in your app, the first thing you need to do
 
 ```ts twoslash
 import { createConfig } from "@account-kit/core";
-import { sepolia, mainnet } from "@account-kit/infra";
+import { sepolia, mainnet, alchemy } from "@account-kit/infra";
 
 export const config = createConfig({
-  apiKey: "ALCHEMY_API_KEY",
+  // use this transport for all chains
+  transport: alchemy({ apiKey: "ALCHEMY_API_KEY" }),
   // this is the default chain
   chain: sepolia,
   chains: [
@@ -27,6 +28,8 @@ export const config = createConfig({
     },
     {
       chain: sepolia,
+      // optional: override the default transport for this chain
+      transport: alchemy({ apiKey: "OTHER_API_KEY" }),
       // optional: sponsor gas for this chain
       policyId: "SEPOLIA_GAS_MANAGER_POLICY_ID",
     },
@@ -55,10 +58,10 @@ await setChain(config, mainnet);
 
 ```ts twoslash [config.ts] filename="config.ts"
 import { createConfig } from "@account-kit/core";
-import { sepolia, mainnet } from "@account-kit/infra";
+import { sepolia, mainnet, alchemy } from "@account-kit/infra";
 
 export const config = createConfig({
-  apiKey: "ALCHEMY_API_KEY",
+  transport: alchemy({ apiKey: "ALCHEMY_API_KEY" }),
   // this is the default chain
   chain: sepolia,
   chains: [

site/pages/core/sponsor-gas.mdx

@@ -29,10 +29,10 @@ Remember to replace `ALCHEMY_API_KEY` with your Alchemy API key. If you don't ha
 
 ```ts twoslash
 import { createConfig } from "@account-kit/core";
-import { sepolia } from "@account-kit/infra";
+import { sepolia, alchemy } from "@account-kit/infra";
 
 export const config = createConfig({
-  apiKey: "ALCHEMY_API_KEY",
+  transport: alchemy({ apiKey: "ALCHEMY_API_KEY" }),
   chain: sepolia,
   policyId: "GAS_MANAGER_POLICY_ID", // [!code ++]
 });

site/pages/core/ssr.mdx

@@ -13,10 +13,10 @@ To enable this setting, you can set `ssr: true` when creating a config.
 
 ```ts twoslash
 import { createConfig } from "@account-kit/core";
-import { sepolia } from "@account-kit/infra";
+import { sepolia, alchemy } from "@account-kit/infra";
 
 export const config = createConfig({
-  apiKey: "YOUR_API_KEY",
+  transport: alchemy({ apiKey: "ALCHEMY_API_KEY" }),
   chain: sepolia,
   ssr: true, // [!code ++]
 });
@@ -59,10 +59,10 @@ import {
   createConfig,
   cookieStorage, // [!code ++]
 } from "@account-kit/core";
-import { sepolia } from "@account-kit/infra";
+import { sepolia, alchemy } from "@account-kit/infra";
 
 export const config = createConfig({
-  apiKey: "YOUR_API_KEY",
+  transport: alchemy({ apiKey: "ALCHEMY_API_KEY" }),
   chain: sepolia,
   ssr: true, // [!code ++]
   storage: cookieStorage, // [!code ++]
@@ -90,10 +90,10 @@ if (typeof window !== "undefined") {
 
 ```ts twoslash [config.ts] filename="config.ts"
 import { createConfig, cookieStorage } from "@account-kit/core";
-import { sepolia } from "@account-kit/infra";
+import { sepolia, alchemy } from "@account-kit/infra";
 
 export const config = createConfig({
-  apiKey: "YOUR_API_KEY",
+  transport: alchemy({ apiKey: "ALCHEMY_API_KEY" }),
   chain: sepolia,
   ssr: true,
   storage: cookieStorage,

site/pages/migration-guide.mdx

@@ -32,6 +32,19 @@ We still support all Signers in the SDK!
 use the guide above to integrate with any signer of your choice.
 :::
 
+### Alchemy Transport
+
+A new `Transport` type has been added: `AlchemyTransport`. This impacts how Alchemy clients, middleware, and configs are created. The `AlchemyTransport` is a type of `viem` transport that makes it easier to configure your communication with Alchemy RPC.
+It supports splitting traffic between Alchemy's AA infra and other Node providers (if needed). The `AlchemyTransport` has been added to `@account-kit/infra` and is exported as `alchemy`.
+
+For Smart Account Clients, the impact of this change is that every `create*AlchemyClient` method has been updated to take in a `transport` property instead of `rpcUrl` or `apiKey` directly.
+
+The `alchemyFeeEstimator` and `alchemyUserOperationSimulator` middleware methods no longer take in a `ClientWithAlchemyMethods` (returned by `createAlchemyPublicRpcClient`) and instead take in an `AlchemyTransport`.
+
+Creating a config to be used with `@account-kit/core` or `@account-kit/react` has also been updated to accept an `AlchemyTransport` and the parameters of `createConfig` have been simplified as a result. Replace your `rpcUrl` or `apiKey` params with `transport: alchemy({...})`.
+
+For more detailed examples, see the relevant guides, depending on which package you are using.
+
 ### Hooks: `useSendTransaction` and `useSendTransactions` removed
 
 These methods have been removed since `useSendUserOperation` can be used to send transactions and user operations. If you were using `useSendTransaction` or `useSendTransactions`, you can replace them with

site/shared/core/config.ts

@@ -1,8 +1,8 @@
 import { createConfig } from "@account-kit/core";
-import { sepolia } from "@account-kit/infra";
+import { alchemy, sepolia } from "@account-kit/infra";
 
 export const config = createConfig({
-  apiKey: "YOUR_API_KEY",
+  transport: alchemy({ apiKey: "YOUR_API_KEY" }),
   chain: sepolia,
   // optional if you want to sponsor gas
   policyId: "YOUR_POLICY_ID",

site/shared/core/ssr-config.ts

@@ -1,8 +1,8 @@
 import { createConfig } from "@account-kit/core";
-import { sepolia } from "@account-kit/infra";
+import { alchemy, sepolia } from "@account-kit/infra";
 
 export const config = createConfig({
-  apiKey: "YOUR_API_KEY",
+  transport: alchemy({ apiKey: "YOUR_API_KEY" }),
   chain: sepolia,
   ssr: true,
 });