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Use the mermail-xstocks-desk skill to find an evidence-backed xStock and prepare one reviewed purchase through Mermail Agent Wallet. The skill uses the published xStocks catalog to identify the product and its Solana token. PayBox then provides the current quote, approval, signing, and request status. An xStock is a tokenized tracker certificate linked to an underlying stock or fund. It is not a share held directly in a brokerage account. Product identity verification also does not guarantee liquidity, eligibility, price, or execution. Start with a direct request such as:
10 USDC is an example. PayBox may apply a different minimum order, fee, or eligibility requirement when it prepares the live quote.

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Before you begin

You need:
  • A Mermail workspace and mailbox.
  • An AI client that supports Agent Skills and MCP OAuth.
  • The mermail-xstocks-desk skill installed in that client.
  • The default full Mermail MCP connection at https://console.mermail.app/mcp, authenticated with OAuth.
  • An active PayBox connection for the workspace.
  • An eligible Solana wallet with enough USDC and SOL for any network fee.
USDC balances are network-specific. USDC on Base is not USDC on Solana. The Mermail Funding checkout currently funds an eligible Base wallet, so it does not by itself prepare a Solana wallet for this xStocks workflow.

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Set up the skill and wallet

1

Install the xStocks skill

If you use Codex, run this in your terminal to install the skill for your user account:
For another Agent Skills-compatible client, run the Skills CLI in the environment used by that client:
Start a new AI session after installation. In Codex, ask it to use mermail-xstocks-desk for your xStock purchase. If Codex cannot find the skill, check that the command completed and start a new session. See Skills for other client-specific setup.
2

Connect the full Mermail MCP profile

Add https://console.mermail.app/mcp to your AI client, choose OAuth, sign in to Mermail, and select the workspace that owns the mailbox and wallet.API-key connections and the agent-inbox profile cannot expose Agent Wallet tools. If you previously connected one of those profiles, add the default /mcp OAuth connection and start a new chat after authentication.
3

Connect PayBox

The workspace owner opens a mailbox in Mermail Console, selects Agent Wallet, and connects PayBox. Confirm that PayBox connection shows ACTIVE.Current workspace members can use the live PayBox tools through the owner’s active connection. If the connection needs repair, the owner must reconnect it in Mermail.
4

Check the Solana wallet

In Agent Wallet, verify the intended Solana wallet and its USDC balance. Keep a small SOL balance available for network fees when the provider requires it.If more than one eligible Solana wallet exists and no saved default is returned, the assistant asks which wallet to use. Selecting a wallet does not submit a purchase.

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Buy one xStock

1

Name the product and amount

Give the assistant one exact product and a USDC amount:
The skill resolves the exact product through the published catalog and checks its current Solana identity. If a name matches multiple products, select one from the returned choices before continuing.
2

Choose a wallet when asked

The assistant uses a provider-declared default wallet or the only eligible Solana wallet. When several eligible wallets remain, reply with the exact wallet shown in the list.Check that the selected wallet holds USDC on Solana. A balance shown for another network cannot fund this purchase.
3

Review the PayBox terms

PayBox prepares the live swap. Review the xStock name, USDC amount, Solana wallet, fees, expected output, and minimum received in the PayBox interface.If the quote expires or its terms change, review the refreshed terms before approving them. Catalog verification identifies the token; the live PayBox response determines whether the transaction can proceed.
4

Approve and sign when required

Complete the approval, passkey, or signing step shown by PayBox. If your AI client cannot render the PayBox interface, open the single authenticated Mermail signing handoff returned for that request.Keep the conversation open. Do not ask the assistant to create another purchase while the original request is waiting for a signature or provider result.
5

Check the original request

After signing, use this prompt:
The assistant checks the existing provider request. Treat pending as still processing and uncertain as a request whose authoritative result is unavailable. The purchase is complete only when PayBox returns a confirmed terminal result.

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Explore products before buying

You can ask for a short list without opening the wallet or creating a swap.

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Browse a category

The assistant matches your wording to categories returned by the live catalog and shows products whose category assignment has evidence. If the category is ambiguous, choose one of the catalog categories it offers. A category with no verified assignments can return no products.

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Browse familiar names

The assistant returns up to five familiar-name products that it can match uniquely in the live catalog. This is a discovery list, not a market ranking or investment recommendation. Neither prompt creates a transaction. After reviewing the list, name one exact product and an exact USDC amount when you want to continue.

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Understand the status

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Troubleshooting

Confirm that the client uses https://console.mermail.app/mcp with OAuth. API keys and the agent-inbox profile do not expose PayBox. Reconnect the full profile, complete workspace consent, and open a new chat so the client refreshes its tool catalog.
Open the returned Mermail handoff. The workspace owner connects or reauthorizes PayBox from Agent Wallet. Return to the same conversation after the connection shows ACTIVE.
Check the network shown next to the balance. This workflow requires USDC on Solana. USDC on Base or another network is a separate asset balance. After the intended Solana wallet is funded, ask the assistant to refresh the portfolio once and continue the same product and amount.
More than one eligible Solana wallet exists and PayBox did not identify a saved default. Reply with one exact wallet from the list. Wallet autonomous permission does not make that wallet the default.
Read the reason returned by the assistant. A halted product, identity conflict, unsupported provider requirement, or unavailable dependency can stop the flow. Do not substitute a similarly named token or send USDC to a token mint.
Use a returned invocation-specific Mermail signing handoff when available. A blank or waiting PayBox frame is not confirmation that the transaction was signed. Keep the original request and do not create a replacement.
Ask the assistant to check the original request. A timeout can happen after submission, so retrying the purchase could create a duplicate. Wait for an authoritative provider result before deciding whether to start a new purchase.

Install Mermail Skills

Install the xStocks workflow for your AI client.

Set up Agent Wallet

Connect PayBox and inspect delegated wallets.

Connect Mermail MCP

Authenticate the full MCP profile with OAuth.

Swaps and recovery

Review the shared PayBox swap and request-status flow.