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Tom Wang
Tom Wang

Posted on • Originally published at tomcn.uk

AI Agents Now Have Credit Cards

#fintech #crypto #payments #ai

Today Nevermined announced the integration that many fintech developers and crypto developers have been waiting for: a unified commerce layer that gives AI agents both delegated Visa credit cards and stablecoin wallets through a single platform. By combining Visa Intelligent Commerce with Coinbase's x402 protocol, Nevermined has created the first production infrastructure where autonomous software can pay for goods and services — using either traditional card rails or crypto — without human intervention per transaction. For any payment developer or AI agent developer in the UK, this is the clearest signal yet that agentic commerce infrastructure is ready to build on.

White humanoid robot representing AI agents entering the commerce ecosystem

How AI Agents Get Their Own Credit Cards

The core innovation is what Visa calls "agentic tokens" — a fourth token type purpose-built for AI agents, sitting alongside the familiar card-present, card-not-present, and device token categories.

Here is how the delegation flow works:

  1. User enrolment: A cardholder registers their Visa card with Visa Intelligent Commerce and authorises a specific AI agent to spend on their behalf.
  2. Token binding: Visa issues a cryptographically bound agentic token that ties to that specific agent. Unlike virtual cards, the token never exposes the card PAN to the agent runtime.
  3. Guardrails: The user sets granular controls — per-transaction limits, daily/monthly budgets, merchant category restrictions, time-based validity windows, and pre-approved vendor lists.
  4. Three-point validation: Every transaction is verified against three criteria: the credential request matches the user's instructions, the merchant authorisation aligns with the request, and the transaction data matches the original consumer intent.

The critical difference from virtual cards is visibility. Agentic tokens identify the agent to banks, merchants, and payment networks, creating a new "human-not-present" transaction category. This replaces the awkward workaround of disguising agent transactions as card-not-present human purchases — a practice that was already causing fraud detection headaches across the industry.

The x402 Protocol: Machine-Native Payments Over HTTP

On the crypto side, Nevermined integrates Coinbase's x402 protocol — the HTTP-native payment standard that revives the long-dormant HTTP 402 "Payment Required" status code.

The flow is elegantly simple for any payment developer who has worked with REST APIs:

  1. An AI agent sends a standard HTTP request to a merchant's API endpoint.
  2. The server responds with 402 Payment Required and a payment instruction in the response header — specifying the price, accepted currencies (USDC, RLUSD, etc.), and a wallet address.
  3. The agent autonomously executes payment via its agentic wallet — holding stablecoins and making payments without direct human handling of private keys.
  4. The merchant verifies payment and serves the requested resource.

Read the full article on tomcn.uk →

About the Author

I'm Tom Wang, a Founding Engineer at Radom building crypto payment infrastructure, Open Banking integrations, and cross-border payout systems with Rust and Go. Based in London, UK.

Currently open to new opportunities in fintech, crypto payments, and AI agent engineering.

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