$TBC TBC (Turing Bit Chain)

x402 Protocol: Redefining the Open Standard for Machine-to-Machine Payments
The core innovation of the x402 protocol lies in seamlessly embedding the act of “payment” into the network request layer, thus eliminating the manual friction found in traditional payment processes. Its design philosophy is based on a long-overlooked HTTP status code—402 Payment Required. When AI agents or applications request protected API resources, the server can return an HTTP 402 response, requiring the client to attach payment credentials before continuing access. This mechanism enables machines to “pay as they go” just like humans, but without the need for account registration, API key management, or subscription binding. The x402 payment process is highly standardized:
Request and Response: The client initiates an API call; if no valid payment is attached, the server returns a 402 status code with structured data (such as amount, recipient address, asset type).
Payment Authorization: The client (such as an AI agent) uses a cryptocurrency wallet to sign the payment information and retries the request.
On-chain Verification and Settlement: After verifying the payment signature, the server broadcasts the transaction to the blockchain for real-time settlement.
This process is suitable not only for AI agents but also for micropayment scenarios involving human users. For example, when a user reads a single article or uses an API once, they can confirm payment directly through their wallet, avoiding forced subscriptions. The openness of x402 allows it to support various stablecoins (such as USDC) and blockchain networks, though the current implementation is still limited by the underlying chain’s performance and cost.
As shown in the diagram, x402’s payment flow enables seamless interaction between AI agents, API services, and blockchains. However, to fully realize its potential, the underlying public chain must offer instant finality, near-zero fees, and high scalability—these are precisely the core advantages of the TBC public chain.