AI Agent 不会干掉信用卡——但会撕开一道缝

Cards will dominate agentic commerce for existing merchants. Stablecoins will power the ones that don't exist yet — and that gap is bigger than most people think.对现有商户，AI agent 支付还是信用卡赢。但稳定币会拿下那些传统支付无法服务的新商户——这个缺口，比大多数人想象的大得多。

The Setup

When Citrini Research published a piece arguing stablecoins would disintermediate Visa and Mastercard, card stocks dropped sharply and Crypto Twitter cheered. The thesis sounded clean: AI agents optimize every transaction, interchange is a tax, stablecoins route around it.

Noah Levine at a16z Crypto spent his days in crypto — and wanted it to be right. But most of it is wrong. Not because stablecoins don’t matter. Because the real opportunity has nothing to do with replacing cards.

Why Cards Win Most of This

Cards don’t just move money. They extend unsecured credit, pre-authorize uncertain transactions, and guarantee fraud protection with chargeback rights. Stablecoins can move money. They cannot yet do the rest.

82% of Americans carry a rewards card. 18 billion cards are in circulation globally.
Visa has issued over 16 billion tokens — an agent is just another device that carries one.
Visa’s Intelligent Commerce framework is in pilot. Mastercard’s Agent Pay is live for all US cardholders.
Stripe + OpenAI’s Agentic Commerce Protocol has Etsy live and 1M+ Shopify merchants coming online.

For existing merchants and consumers, cards will likely dominate agentic commerce. Full stop.

The Real Stablecoin Opportunity: Merchants That Don’t Exist Yet

Every platform shift creates merchants the existing payment system cannot serve — until it adapts. PayPal took 16 years before processors created formal underwriting guidelines for the model it pioneered.

The AI wave is creating these merchants faster than any prior shift:

36 million new developers joined GitHub last year alone
In YC W2025, 25% of companies had codebases 95%+ AI-generated
On Bolt.new, 67% of 5 million users are not developers

A vibe coder builds a financial data tool in four hours. No website. No legal entity. Another agent calls it 40,000 times at $0.001/call — $40 revenue, zero human checkout. The first question is always: “How do I get paid?” Right now, most of them can’t.

Processors reject them — not because the tech is lacking, but because underwriting requires a merchant profile. No website, no entity, no track record = unacceptable risk.

Protocols like x402 embed stablecoin payments directly into HTTP requests. No merchant account, no processor, no onboarding, no chargeback liability. These merchants aren’t choosing stablecoins over cards. They’re choosing stablecoins over nothing.

Why It Matters

The pattern is consistent across every platform shift: new merchant waves come first, underwriting catches up later. In that gap, stablecoins are the infrastructure.

Cards serve every merchant a processor can underwrite. Stablecoins serve every merchant a processor cannot. The next wave of commerce will be built in that gap — and vibe coders, AI-native tools, and autonomous agent services are already living there.

What to watch:

x402 protocol adoption across AI developer tooling
How quickly Visa/Mastercard extend agent token support
Whether stablecoin payment rails (Circle, Base) capture the “new merchant” cohort before processors adapt

背景

前段时间，Citrini Research 发了篇报告说稳定币会取代 Visa 和 Mastercard，卡公司股票当天应声大跌，Crypto Twitter 一片欢呼。逻辑听起来很干净：AI agent 会优化每一笔交易，跨行手续费就是税，稳定币绕过去就行了。

a16z Crypto 的 Noah Levine 自己在 crypto 圈混，也希望这个逻辑是对的。但大部分都是错的。不是因为稳定币不重要，而是真正的机会根本不在于取代信用卡。

为什么信用卡会赢大部分

信用卡不只是搬钱。它提供无担保信贷、预授权不确定金额、带消费纠纷保护。稳定币能搬钱，但其他的暂时做不到。

82% 的美国人有奖励信用卡，全球流通 180 亿张
Visa 已发行超过 160 亿个 token——agent 只是一个新设备，用一样的 token
Visa Intelligent Commerce 框架在试点，Mastercard Agent Pay 已向所有美国持卡人开放
Stripe + OpenAI 的 Agentic Commerce Protocol 已有 Etsy 接入，超百万 Shopify 商家即将上线

对现有商户和消费者来说，AI agent 支付的主战场，信用卡大概率是赢家。就这样。

稳定币的真正机会：那些还不存在的商户

每次平台浪潮都会制造传统支付体系无法服务的新商户——直到系统慢慢适应。PayPal 开创了聚合商户模式，结果等了16年，行业才有正式的承保标准。

这次 AI 浪潮制造新商户的速度，比任何一次都快：

去年一年 GitHub 新增 3600 万开发者
YC 2025 冬季班里，25% 的公司代码库 95% 以上由 AI 生成
Bolt.new 的 500 万用户里，67% 根本不是开发者

一个 vibe coder 用四小时做了个金融数据工具，没有网站，没有公司实体。另一个 agent 一周调用了 4 万次，每次 0.001 美元，赚了 40 美元，全程没有人类点击付款页面。这些人的第一个问题永远是：「怎么收钱？」 现在，大多数人收不了。

原因不是技术，是风控。支付处理商不接受没有网站、没有实体、没有记录的商户。

x402 协议直接把稳定币支付嵌进 HTTP 请求。不需要商户账号、不需要处理商、不需要审核、没有退款风险。这些人不是在「选稳定币 vs 信用卡」，他们是在「选稳定币 vs 什么都没有」。

为什么重要

历史规律很清楚：新商户浪潮先来，支付体系的承保能力后到。在这个空档期，稳定币就是基础设施。

信用卡服务每一个支付体系能承保的商户；稳定币服务每一个支付体系无法承保的商户。下一波商业浪潮就在那道缝里建起来——vibe coder、AI 原生工具、自主 agent 服务，都已经住在里面了。

值得关注：

x402 协议在 AI 开发者工具中的渗透速度
Visa/Mastercard 的 agent token 支持范围扩展进度
Circle、Base 等稳定币支付轨道，能否在传统处理商适应前锁定「新商户」群体

Agentic Commerce Won't Kill Cards — But It Will Open a GapAI Agent 不会干掉信用卡——但会撕开一道缝