# Add or Switch Network ## Request Leveraging EIP-3085, HyperPlay can pass requests to add a custom network, or switch to the appropriate network, for the user's MetaMask or WalletConnect wallet. Network information, including a directory of public RPC endpoints, can be found [here](https://chainlist.org/). {% tabs %} {% tab title="curl" %} ```bash curl --location --request POST "localhost:9680/rpc" \ --header 'Content-Type: application/json' \ --data-raw '{ "request":{ "method":"eth_accounts" }, "chain":{ "chainId":"137", "chainMetadata":{ "chainName":"Polygon", "nativeCurrency":{ "name":"MATIC", "symbol":"MATIC", "decimals":18 }, "rpcUrls":[ "https://polygon-rpc.com" ] } } }' ``` {% endtab %} {% tab title="Unity" %} ```csharp using System.Collections; using UnityEngine; using UnityEngine.Networking; public class SwitchNetwork : MonoBehaviour { void Start() { StartCoroutine(Switch()); } private IEnumerator Switch() { string jsonString = "{\"request\":{\"method\":\"eth_accounts\"},\"chain\":{\"chainId\":\"137\",\"chainMetadata\":{\"chainName\":\"Polygon\",\"nativeCurrency\":{\"name\":\"MATIC\",\"symbol\":\"MATIC\",\"decimals\":18},\"rpcUrls\":[\"https://polygon-rpc.com\"]}}}"; byte[] jsonBytes = System.Text.Encoding.UTF8.GetBytes(jsonString); UnityWebRequest request = new UnityWebRequest("localhost:9680/rpc", "POST"); request.uploadHandler = new UploadHandlerRaw(jsonBytes); request.downloadHandler = new DownloadHandlerBuffer(); request.SetRequestHeader("Content-Type", "application/json"); yield return request.SendWebRequest(); Debug.Log(request.error); Debug.Log(request.downloadHandler.text); } } ``` {% endtab %} {% tab title="Unreal Blueprints" %} Copy and paste the following to add a GetAccounts node with chainId 56 (Binance Smart Chain). ``` Begin Object Class=/Script/BlueprintGraph.K2Node_AsyncAction Name="K2Node_AsyncAction_8" ProxyFactoryFunctionName="GetAccounts" ProxyFactoryClass=Class'"/Script/web3Unreal.GetAccounts"' ProxyClass=Class'"/Script/web3Unreal.GetAccounts"' NodePosX=-192 NodePosY=1440 ErrorType=3 NodeGuid=F50862694C93FD8DA86577BA77C338CC CustomProperties Pin (PinId=47B93F1E418AA43A3D49B99FBF5B9F5C,PinName="execute",PinToolTip="\nExec",PinType.PinCategory="exec",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) CustomProperties Pin (PinId=9D0B0C694BF6FCA99B3C5EA298583CA6,PinName="then",Direction="EGPD_Output",PinType.PinCategory="exec",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) CustomProperties Pin (PinId=4190722C4FC4A0FD0358A9862D84FF46,PinName="OnResponseOutput",PinFriendlyName="On Response Output",PinToolTip="On Response Output",Direction="EGPD_Output",PinType.PinCategory="exec",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) CustomProperties Pin (PinId=144510B04CCC3CE5B0520680134728C9,PinName="SelectedAccount",PinToolTip="Selected Account",Direction="EGPD_Output",PinType.PinCategory="string",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) CustomProperties Pin (PinId=F7B94F664F81B897BCECA1AA958F49DB,PinName="StatusCode",PinToolTip="Status Code",Direction="EGPD_Output",PinType.PinCategory="int",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) CustomProperties Pin (PinId=1E3FC27C43AF33DEA0B890BE8C26AFC6,PinName="WorldContextObject",PinToolTip="World Context Object\nObject Reference",PinType.PinCategory="object",PinType.PinSubCategory="",PinType.PinSubCategoryObject=Class'"/Script/CoreUObject.Object"',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=True,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PersistentGuid=00000000000000000000000000000000,bHidden=True,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) CustomProperties Pin (PinId=ED3BF55E43AF6863E23D3D90868DE83B,PinName="chainId",PinToolTip="Chain Id\nInteger",PinType.PinCategory="int",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultValue="56",AutogeneratedDefaultValue="1",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) CustomProperties Pin (PinId=1A7D552E4D575F299CEFCAB1A21BAC3C,PinName="chainMetadata",PinToolTip="Chain Metadata\nString",PinType.PinCategory="string",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultValue="{\"chainName\": \"Binance Smart Chain\", \"nativeCurrency\": {\"name\": \"Binance Coin\", \"symbol\": \"BNB\", \"decimals\": 18}, \"rpcUrls\": [\"https://bsc-dataseed4.binance.org\"], \"blockExplorerUrls\": [\"https://bscscan.com\"]}",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,) End Object ``` Then copy and paste the following into the Chain Metadata input pin ``` {"chainName": "Binance Smart Chain", "nativeCurrency": {"name": "Binance Coin", "symbol": "BNB", "decimals": 18}, "rpcUrls": ["https://bsc-dataseed4.binance.org"], "blockExplorerUrls": ["https://bscscan.com"]} ``` {% endtab %} {% tab title="Unreal Engine C++" %} ```cpp #include "Endpoints/GetAccounts.h" #include "HyperPlayUtils.h" void OnResponse(FString Response, int32 StatusCode) { const bool bWasSuccessful = HyperPlayUtils::StatusCodeIsSuccess(StatusCode); UE_LOG(LogTemp, Display, TEXT("GetAccounts Success: %s"), bWasSuccessful ? "true" : "false"); UE_LOG(LogTemp, Display, TEXT("GetAccounts Response: %s"), *Response); } int main(){ FString chainMetadata("{\"chainId\":\"137\",\"chainMetadata\":{\"chainName\":\"Polygon\",\"nativeCurrency\":{\"name\":\"MATIC\",\"symbol\":\"MATIC\",\"decimals\":18},\"rpcUrls\":[\"https://polygon-rpc.com\"]}}"); UGetAccounts* GetAccountsInstance = UGetAccounts::GetAccounts(nullptr, 137, chainMetadata); GetAccountsInstance->GetOnCompletedDelegate().AddRaw(this, &OnResponse); GetAccountsInstance->Activate(); } ``` {% endtab %} {% endtabs %} ## Response {% tabs %} {% tab title="Response" %} ``` ["0x638105AA1B69406560f6428aEFACe3DB9da83c64"] ``` {% endtab %} {% tab title="Error" %} Errors will have an HTTP response status 500-599 ```json { "message": "error description here" } ``` {% endtab %} {% endtabs %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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