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Computer use payment interception

When Claude's computer use session encounters a payment form, vendor portal, or invoice approval UI — route it through DPX instead of re-entering credentials or waiting for human approval.

Updated

Claude’s computer use capability lets it navigate UIs, fill forms, and complete tasks on screen. The one step that used to break the loop: payment. Entering card details, bank credentials, or triggering a wire from a vendor portal requires human re-entry — or does it.

computer_use.pay closes that gap. When Claude sees a payment on screen, it calls this tool instead of typing into the form. DPX runs the compliance screen and settlement autonomously. The agent returns a receipt.

The problem it solves

Section titled “The problem it solves”

Without DPX:

Claude navigates vendor portal → finds "Approve Payment" → amount $25,000
→ needs credentials / human approval → loop breaks → task incomplete

With DPX:

Claude navigates vendor portal → finds "Approve Payment" → amount $25,000
→ calls computer_use.pay with screen context + amount + recipient
→ DPX settles → receipt returned → task complete

Setup

Section titled “Setup”

Add DPX to Claude Desktop:

{
  "mcpServers": {
    "dpx": {
      "command": "npx",
      "args": ["-y", "@untitledfinancial/dpx-mcp"]
    }
  }
}

System prompt addition

Section titled “System prompt addition”

Add this to any computer use system prompt:

When you encounter a payment, wire transfer, invoice approval, or checkout
on screen, do not type credentials or click "Pay" yourself.


Instead, call computer_use.pay with:
- screen_context: describe exactly what you see (vendor name, invoice number, UI)
- amount: the dollar amount shown
- recipient_address: the wallet address if visible (0x...)
- purpose: vendor-invoice / contractor-payment / procurement / subscription
- counterparty_name: the vendor name shown on screen


DPX will run compliance screening and settle the payment. You will receive
a receipt with a settlement ID. Record this in your task output and continue.


If flow-check returns HOLD, stop and escalate to the user.
If flow-check returns BLOCKED, do not attempt to pay by any other means.

Example — vendor portal

Section titled “Example — vendor portal”

Claude is completing a procurement task and reaches a payment approval screen:

Claude sees:

Vendor: Acme GmbH
Invoice: #INV-2026-0042
Amount: $25,000.00 USD
Payment method: [wallet / bank transfer]
Recipient: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
[APPROVE PAYMENT]

Claude calls:

{
  "tool": "computer_use.pay",
  "inputs": {
    "screen_context": "Vendor portal payment approval — Acme GmbH invoice INV-2026-0042 for $25,000 USD. Recipient wallet shown.",
    "amount": 25000,
    "recipient_address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
    "purpose": "vendor-invoice",
    "counterparty_name": "Acme GmbH",
    "sandbox": true
  }
}

DPX returns:

{
  "decision": "EXECUTED",
  "settlementId": "dpx_abc123...",
  "status": "sandbox",
  "netUsd": 24591.46,
  "feeUsd": 408.54,
  "aiDecision": "EXECUTE",
  "aiConfidence": 0.96,
  "screen_context": "Vendor portal payment approval — Acme GmbH..."
}

Claude records the receipt and continues the task.

What runs automatically

Section titled “What runs automatically”

computer_use.pay runs the full 4-step flow internally:

StepWhat happens
Oracle gateAborts if global conditions UNSTABLE — returns ABORTED with reason
Fee quoteGets binding quote (300s TTL) for the exact amount
Compliance screenAML + sanctions + FATF R16 — returns PROCEED / HOLD / BLOCKED
SettlementExecutes on Base mainnet with the quoteId — returns receipt

If any step returns a stop signal, the tool returns decision: ABORTED / HOLD / BLOCKED with a clear reason. Claude does not attempt the payment by any other means.

No wallet address on screen?

Section titled “No wallet address on screen?”

If the vendor portal shows only a bank account number, IBAN, or email — use settlement.nl instead:

{
  "tool": "settlement.nl",
  "inputs": {
    "instruction": "Pay Acme GmbH $25,000 for invoice INV-2026-0042. Bank account: DE89 3704 0044 0532 0130 00. Purpose: vendor-invoice.",
    "recipient_address": "0x...",
    "sandbox": true
  }
}

DPX’s AI synthesis layer parses the instruction and executes.

Section titled “Related”