Cardano 现可在纸面上支持 AI 支付

Unconfirmed links are equally critical

The fact that has not yet been confirmed is equally important. On the main web, no public application demonstrates that AI agents can repeatedly pay for real services using tokens issued by ADA or Cardano. Therefore, this progress establishes technical compatibility rather than commercial adoption.

Imagine a scenario where an AI agent purchases a dataset

The agent requests data from an online service. The service provider responds to an HTTP 402 message that contains the price, accepted asset types, and payment address. The wallet or signature system checks whether the payment meets the restrictions set by the user or developer. The signed payment is then verified and submitted to the Cardano network. The data set is released after the service provider confirms the payment.

The agent does not necessarily have full control of the wallet. Applications can limit the amount they spend, the services they are allowed to use, and the types of assets they can send. This distinction is crucial because the goal of x402 is to automate single payments rather than give AI systems unlimited access to their funds.

What Cardano actually adds

x402 is an open payment standard built around HTTP 402, or "payment required" network response code. It allows a website or API to request payment during the same interaction as requesting a product. The current official x402 software development kit (SDK) lists support for the Cardano network in its TypeScript implementation. This provides JavaScript and TypeScript developers with a standard tool to prepare Cardano payments and connect them to x402-enabled services.

The current function matrix does not list support for Cardano in official Go or Python implementations. As a result, developers using these languages need additional components or do their own integration work. An independent project of the Cardano Foundation provides a Java-based mediation tool (Facilitator). It is related to the same payment standard, but is not the Java version of the official TypeScript package. These two distributions address different aspects of the integration problem and should not be considered the same product.

Who can move funds?

The mediation tool is located between the application requesting payment and the Cardano network. Its responsibility is to check signed transactions, verify whether they match payment requests, and submit them to the blockchain.

• User or developer: Set spending limits, select allowed assets, and decide which services the agent can use.
• Wallet: After checking that the transaction complies with the rules, approve and sign the exact transaction.
• Mediation tool: 验证并提交已签名的交易。它不持有私钥，也不代表付款人签名。

Cardano 的扩展未花费交易输出（eUTXO）模型使支付条款变得明确。交易标识了正在花费的资金以及将创建的新输出。如果有人在批准后更改收款人或金额，现有的签名将不再有效。

这防止了中介工具悄悄重写已签名的支付。但这并不能保护用户免受最初批准恶意请求的风险，因此钱包权限和支出限制仍然至关重要。

预生产测试证明了一条可行的路径

Cardano 基金会的中介工具已在 preprod（Cardano 的公共测试网络）上完成了端到端交易。根据项目仓库的信息，测试显示服务方能够验证已签名的支付，提交它并确认其被纳入链上。

测试所演示的内容

• Cardano 支付可以被准备和签名
• 中介工具可以验证其详细信息
• 交易可以提交至 preprod 网络
• 链上包含状态可以得到确认

尚未公开测试的内容

• 使用有价值的主网资产进行的支付
• 来自独立应用的持续流量
• 买卖双方产生的商业需求
• 在生产环境下的可靠性

仓库还指出，其服务器提交路由已进行端到端测试，而客户端提交选项仅在软件层面进行了测试，未针对真实提供商进行实操。在第二种模式中，中介工具准备或验证支付，而由另一个系统提交交易。

投入生产使用不仅仅意味着切换网络设置。开发者需要确保中介工具的验证和结算端点的安全，限制接受的交易脚本，并谨慎处理延迟确认的问题。最后一点非常实用：即使应用程序尚未收到确认，交易可能已经到达网络。自动重新提交相同的支付可能会造成混淆，或者根据实现方式的不同，导致意外的重复尝试。应用程序需要在重试之前检查交易的状态。

支持 Cardano 支付并不保证对 ADA 的需求

x402 服务可以选择接受 ADA 或 Cardano 上发行的其他资产，包括稳定币。软件使得这些支付路线成为可能，但它并不决定卖家将要求哪种资产。ADA 可能仍用于网络费用，具体取决于应用程序如何构建结算流程。然而，仅靠小额交易费用并不能建立对该代币的重大需求。这需要实际的服务、重复的使用以及相对于更广泛的 ADA 市场而言足够的支付量。

目前没有公开的商業应用程序披露在 Cardano 上 recurring 的 x402 支付量，也未展示客户偏好哪些资产。因此，声称 AI 支付已经在创造大量 ADA 需求的说法，往往超出了现有证据的范围。

其他 x402 集成使用不同的运营模式。例如，Circle 引入了托管式中介工具，为支持的 USDC 支付处理验证、交易提交和 Gas 管理。正如我们在关于 Circle 面向 AI 代理的 x402 服务的报告中所述，这种方法减少了开发者必须运营的基础设施，但也使应用程序更加依赖 Circle。

Cardano 提供的工具给予开发者更多空间来运行自己的中介工具。这可以提供更大的控制权，但开发者也需承担安全、正常运行时间以及正确处理交易的责任。

下一个证明必须来自实际应用

另一份库的发布将扩大可以尝试 Cardano 支付的开发者范围，尤其是如果官方的 Go 或 Python 支持紧随其后。但这并不能回答是否有人真的想使用该系统。

更有意义的证据将是一个命名的应用程序完成主网对真实产品的支付，公布交易参考链接，并回来进行额外购买。可靠性数据也很重要：支付失败频率如何，服务方确认速度多快，以及自动化买家是否会提出重复请求。

Cardano now has the components needed to try this test. The next big announcement should not be that an AI agent can theoretically pay, but that an independent agent pays for something useful-and comes back to buy again.

This article is for reference only and does not constitute financial or investment advice. As development continues, blockchain software, test results and network support may change.