Solana Support - WalletConnect Pay Docs

Solana Support Guide

WalletConnect Pay supports Solana payments, enabling users to pay with native SOL and SPL tokens. This guide covers how to extend your wallet’s WalletConnect Pay integration to support Solana payments end-to-end.

This guide applies whether you integrate with the Wallet Pay SDK or directly with the Gateway API ( API-first). The signing requirements are identical — Solana actions arrive as walletRpc actions, and the signed transaction is returned in the results array. The code samples below use SDK method names; if you are integrating API-first, the equivalents are:

Everything else in this guide — advertising Solana accounts, routing by namespace, the solana_signTransaction payload, and returning the signed transaction blob — is the same in both integrations.

Solana payment flow

A Solana payment follows the same three-call flow as any other WalletConnect Pay payment. The only Solana-specific parts are the signing method (solana_signTransaction) and that your wallet signs but never broadcasts — the WalletConnect Pay backend submits the signed transaction to the network.

The results[] (or signatures[]) you submit on confirm must match the option’s actions[] in order and length — including any EVM actions that precede a Solana action in a mixed-chain option.

Key capabilities

Implementing Solana support enables three primary features:

1. Native SOL transactions — Users can initiate Solana payments through Pay links when merchants support the network.
2. Mixed-chain options — Single payment links can present both EVM and Solana choices simultaneously.
3. Namespace-based routing — Individual actions route to appropriate signers based on CAIP-2 namespace identifiers.

Implementation requirements

Follow these requirements to correctly implement Solana payment support in your wallet.

Advertise Solana accounts

Include Solana accounts when calling getPaymentOptions using the CAIP-10 format:

solana:<chainReference>:<base58Pubkey>

For example, a Solana mainnet account would be formatted as:

solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp:7xKXtg2CW87d97TXJSDpbD5jBkheTqA83TZRuJosgAsU

• TypeScript

const evmAccounts = evmChains.map(
  (chain) => `eip155:${chain.id}:${evmAddress}`
);
const solanaAccounts = solanaChains.map(
  (chain) => `solana:${chain.reference}:${solanaPublicKey.toBase58()}`
);

const options = await pay.getPaymentOptions({
  paymentId,
  accounts: [...evmAccounts, ...solanaAccounts],
});

• Kotlin

val evmAccounts = evmChains.map { chain ->
    "eip155:${chain.id}:${evmAddress}"
}
val solanaAccounts = solanaChains.map { chain ->
    "solana:${chain.reference}:${solanaPublicKey}"
}

val options = pay.getPaymentOptions(
    paymentId = paymentId,
    accounts = evmAccounts + solanaAccounts
)

• Swift

let evmAccounts = evmChains.map { chain in
    "eip155:\(chain.id):\(evmAddress)"
}
let solanaAccounts = solanaChains.map { chain in
    "solana:\(chain.reference):\(solanaPublicKey)"
}

let options = try await pay.getPaymentOptions(
    paymentId: paymentId,
    accounts: evmAccounts + solanaAccounts
)

Only advertise Solana accounts if your wallet has Solana keys available. Wallets without Solana support should not include Solana accounts in the request.

Route actions by namespace

Determine the signing wallet for each action using the namespace from the chain ID. Extract the namespace from actions[i].walletRpc.chainId rather than assuming a single wallet type for all actions.

• TypeScript

function getNamespace(chainId: string): string {
  return chainId.split(':')[0];
}

for (const action of actions) {
  const namespace = getNamespace(action.walletRpc.chainId);

switch (namespace) {
    case 'eip155':
      // Route to EVM wallet
      await handleEvmAction(action);
      break;
    case 'solana':
      // Route to Solana wallet
      await handleSolanaAction(action);
      break;
    default:
      throw new Error(`Unsupported namespace: ${namespace}`);
  }
}

• Kotlin

fun getNamespace(chainId: String): String = chainId.split(':')[0]

for (action in actions) {
    val namespace = getNamespace(action.walletRpc.chainId)

when (namespace) {
        "eip155" -> handleEvmAction(action)
        "solana" -> handleSolanaAction(action)
        else -> error("Unsupported namespace: $namespace")
    }
}

• Swift

func getNamespace(_ chainId: String) -> String {
    chainId.split(separator: ":").first.map(String.init) ?? ""
}

for action in actions {
    let namespace = getNamespace(action.walletRpc.chainId)

switch namespace {
    case "eip155":
        try await handleEvmAction(action)
    case "solana":
        try await handleSolanaAction(action)
    default:
        throw PaymentError.unsupportedNamespace(namespace)
    }
}

Implement Solana signing

For Solana actions, implement the solana_signTransaction method. Sign the transaction and append the signed transaction blob, base64-encoded to the signatures array.

• TypeScript

async function handleSolanaAction(action: Action): Promise<string> {
  const { method, params } = action.walletRpc;

if (method !== 'solana_signTransaction') {
    throw new Error(`Unsupported Solana method: ${method}`);
  }

const [{ transaction }] = JSON.parse(params);

const txBuffer = Buffer.from(transaction, 'base64');
  const tx = Transaction.from(txBuffer);

tx.sign(solanaKeypair);

return tx.serialize().toString('base64');
}

• Kotlin

suspend fun handleSolanaAction(action: Action): String {
    val method = action.walletRpc.method

require(method == "solana_signTransaction") {
        "Unsupported Solana method: $method"
    }

val params = JSONArray(action.walletRpc.params)
    val txData = params.getJSONObject(0).getString("transaction")

val txBytes = Base64.decode(txData, Base64.DEFAULT)
    val signedTx = solanaWallet.signTransaction(txBytes)

return Base64.encodeToString(signedTx, Base64.NO_WRAP)
}

• Swift

func handleSolanaAction(_ action: Action) async throws -> String {
    let method = action.walletRpc.method

guard method == "solana_signTransaction" else {
        throw PaymentError.unsupportedMethod(method)
    }

let params = try JSONDecoder().decode(
        [[String: String]].self,
        from: action.walletRpc.params.data(using: .utf8)!
    )
    let txData = params[0]["transaction"]!

let txBytes = Data(base64Encoded: txData)!
    let signedTx = try solanaWallet.signTransaction(txBytes)

return signedTx.base64EncodedString()
}

Return the signed transaction, not the signature. Solana signer libraries may return both a detached bs58 signature and the signed transaction blob. WalletConnect Pay expects the complete base64-encoded signed transaction, not the detached signature.

Do not send transactions

Do not implement solana_signAndSendTransaction for Pay flows. The WalletConnect Pay backend handles broadcasting the signed transaction. Your wallet should only sign and return the signed transaction blob.

Handle array-wrapped params

The Pay backend provides params in an array-wrapped structure: [{ transaction }]. Make sure to unwrap this structure when parsing the transaction data.

// Correct: unwrap the array
const [{ transaction }] = JSON.parse(params);

// Incorrect: accessing params directly
const { transaction } = JSON.parse(params); // This will fail

Validate signers at runtime

Guard action handlers against missing signers at execution time. If your wallet doesn’t have a Solana signer available when a Solana action is encountered, raise an error rather than silently skipping the action.

if (namespace === 'solana' && !solanaWallet) {
  throw new Error('Solana wallet not available');
}

Reject unknown methods

Reject unknown wallet-RPC methods instead of silently omitting them from result arrays. The signatures array must match the actions array in order and length.

default:
  throw new Error(`Unknown method: ${method}`);
// Never silently skip or return undefined

Complete action handler

Here’s a complete example showing how to handle both EVM and Solana actions in a single payment flow:

• TypeScript

async function approvePayment(actions: Action[]): Promise<string[]> {
  const signatures: string[] = [];

for (const action of actions) {
    const { chainId, method, params } = action.walletRpc;
    const namespace = chainId.split(':')[0];

let signature: string;

switch (namespace) {
      case 'eip155':
        signature = await handleEvmAction(method, chainId, params);
        break;
      case 'solana':
        signature = await handleSolanaAction(method, params);
        break;
      default:
        throw new Error(`Unsupported namespace: ${namespace}`);
    }

signatures.push(signature);
  }

return signatures;
}

Validate your integration

Before shipping your Solana support implementation, verify these scenarios work correctly:

1. SOL-only payment: Test a payment link that only offers Solana options.
   • Verify that: The Solana option is presented to the user, the transaction is signed correctly, the base64-encoded signed transaction is submitted, the payment completes successfully.
2. Mixed EVM and Solana payment: Test a payment link that offers both EVM and Solana options.
   • Verify that: Both option types are presented, users can select either network, the correct signer is used for the selected option, payment completes regardless of which option is chosen.
3. EVM flow regression: After adding Solana support, verify that existing EVM flows still work:
   • USDC payments with EIP-3009, USDT payments with Permit2, Native token payments.
4. Missing Solana wallet: Test behavior when Solana keys are not available:
   • Verify that: Solana options should not be advertised to users, no errors should occur during option fetching, EVM options should work normally.

Sample implementation

The React Native reference wallet demonstrates Solana support implementation: React Native \ wallets/rn_cli_wallet — see PaymentStore.approvePayment for namespace dispatch logic and usePairing.handlePaymentLink for account concatenation.