In the crypto world, every technological breakthrough has the potential to spark new market trends. In October 2025, a highly anticipated token—$PING—was launched on the Base chain.
As the first token issued on Base via the x402 protocol, $PING not only delivered remarkable wealth effects but also offered a glimpse into the future of deep integration between AI and blockchain payments.
▎What Is $PING? The Rising Star on Base Chain
$PING is the first token issued through Coinbase’s open payment protocol x402, built on the Ethereum Layer-2 network Base.
Its minting process is reminiscent of the inscription craze of 2023—no flashy front-end interface, a deliberately bare-bones design, and users simply mint by sending USDC to a designated address.
Behind this straightforward minting method lies impressive returns. Based on the initial cost and current token price, a successful mint yields roughly an 18x return, peaking at up to 30x.
PING’s price performance has been equally striking. On Gate, the PING token reached a high of $0.073 on October 25, with its market cap surpassing $70 million.
(Note: Cryptocurrency prices are highly volatile. For the latest data as of October 30, please refer to the Gate platform. Data in this article is for historical reference only.)
▎x402 Protocol: A Revolutionary Solution for AI Agent Payments
To understand the value of $PING, it’s essential to grasp the x402 protocol behind it. x402 is an open payment protocol developed by Coinbase, enabling AI agents to autonomously complete transactions.
Core Mechanism of the x402 Protocol
The x402 protocol leverages the long-reserved "HTTP 402 Payment Required" status code to require payment before completing API requests or loading web pages.
If an API request lacks payment information, x402 returns an HTTP 402 status code, prompting the client to pay and retry the request.
The protocol’s workflow is as follows:
- A user asks an AI (such as Claude): "Use my Coinbase wallet to buy a pair of jeans on Amazon."
- The AI receives the request and initiates a purchase request to Amazon.
- Amazon constructs a preliminary transaction, including the wallet address to be used, the blockchain, the token, and the exact amount.
- The AI sends this transaction to the x402 protocol validator to check whether the wallet has sufficient assets on the specified chain, whether the item is tradable, and whether the user has authorized the transaction.
- Once validated, the amount and proof of payment are sent to the merchant’s address, completing the transaction.
Solving Key Pain Points in AI Payments
The x402 protocol addresses two core pain points facing the AI agent economy:
- Lack of identity and sovereignty: AI agents lack legal or natural person status and cannot open accounts with traditional banks or payment systems. x402 provides AI agents with a payment identity based on blockchain addresses.
- Economic friction in micropayments: AI-driven economic activity is inherently high-frequency and low-value, but traditional payment fees often exceed the transaction amount itself. x402 enables blockchain-based micropayments, making payments as small as $0.01 economically viable.
▎How Does the x402 Protocol Enable Real-Time USDC Settlement for AI?
The x402 protocol’s ability to enable real-time USDC settlement for AI relies on its elegant architecture and robust technical foundation.
Minimalist Payment Verification Architecture
The strength of the x402 protocol lies in its minimalist design philosophy. It focuses exclusively on solving one core issue: the "verifiability" of payments between buyers (clients) and sellers (servers).
This approach dramatically lowers the adoption barrier. Developers or service providers don’t need to understand the complexities of blockchain operations—they simply create a wallet, integrate a few lines of code, and can monetize their service for AI agents or human users worldwide.
The Critical Role of the "Facilitator" Middleman
In the x402 protocol architecture, the "Facilitator" serves as the linchpin of simplicity, acting as both the on-chain payment coordinator and the technical abstraction layer.
The Facilitator completely encapsulates all blockchain-related complexities in the payment process, including wallet management, private key signing, gas fee estimation, transaction construction, on-chain broadcasting, and status verification.
Thanks to the Facilitator, neither client nor server needs to interact directly with the blockchain. They simply use standard HTTP requests to complete full on-chain value settlements, delivering a seamless, frictionless payment experience.
Asynchronous Settlement for Low-Latency Experience
The most ingenious aspect of the x402 protocol is its asynchronous settlement mechanism, enabling near real-time payment experiences.
- Payment challenge: The client requests a service from the server, which responds with a 402 - Payment Required status code.
- Signing payment intent: The client creates a "payment voucher" compliant with EIP-3009, inserts it into the HTTP request header, and resends the request to the server.
- Verification and asynchronous settlement: The server forwards the voucher to the Facilitator for verification. Upon receiving a "verified" confirmation, it immediately returns data to the client without waiting for blockchain confirmation, while settlement is completed "asynchronously" in the background.
This design shifts the "waiting for blockchain confirmation" latency risk to the Facilitator, so the client only experiences the round-trip time of two API calls between server and Facilitator (milliseconds), resulting in a near-instant payment experience.
Technical Support from the EIP-3009 Standard
All of this is possible thanks to Ethereum’s EIP-3009 standard. This standard allows users (or AI agents) to sign a one-time authorization, enabling the Facilitator to "pull" funds in the future without further client intervention.
Currently, USDC contracts on Base support this feature, making it the preferred settlement network for the x402 protocol.
▎x402 Ecosystem and Future Prospects
The x402 protocol ecosystem is still in its early stages, but several noteworthy projects have already emerged.
A Thriving x402 Ecosystem
Beyond $PING, there are several key projects in the x402 ecosystem:
- Questflow: A multi-AI agent workflow layer allowing multiple AI agents to autonomously coordinate and execute tasks. Has completed a $6.5 million seed round.
- PayAI: Offers multi-chain x402 payment services—including support for Solana—and x402 verification services. The $PAYAI token has a market cap of around $5 million.
- Daydreams: Provides x402-enabled LLM inference processes for applications and AI agents. The $dreams token has a market cap of about $6.7 million.
- Kite AI: Building the foundational transaction layer for the "Internet of Agents," providing unified identity, payment, and governance infrastructure for autonomous agents. Has raised $33 million, led by PayPal Ventures and General Catalyst.
Robust Backing
The x402 protocol enjoys strong backing. In September 2025, Coinbase and Cloudflare announced the joint establishment of the x402 Foundation to promote protocol development.
While there are competing solutions in the market, such as bitGPT’s h402 and Radius’s EVMAuth, x402 stands out with the strongest backing and highest level of attention.
Market Data and Adoption
The x402 protocol is already showing robust growth. Over the past 30 days, $PING’s interface has processed over 150,000 x402 transactions totaling around $140,000—far outpacing the second-place Questflow.
As of October 2025, the total market cap of the x402 ecosystem has reached approximately $806 million, with 24-hour trading volume exceeding $224 million, reflecting strong investor interest in micropayments and agent-based financial innovation.
▎Conclusion: The Future of $PING and the x402 Protocol
As the first token issued on Base via the x402 protocol, $PING’s significance goes far beyond short-term price action. It reveals a new digital economy powered by AI agents:
- For users, the x402 protocol makes "pay-per-use" micropayment models possible, offering a fairer and more efficient value exchange than traditional "registration/subscription" systems.
- For developers, the simple integration process allows any Web2 or Web3 developer to adopt the x402 protocol and monetize their services with minimal barriers.
- For AI agents, the x402 protocol provides autonomous payment capabilities for the first time, enabling AI-to-AI economic activity.
PING’s meteoric rise has not only revived the "inscription" legend on Base but also put the Coinbase x402 protocol in the spotlight. While PING’s current implementation has sparked debate, the vast potential of the x402 protocol—and the powerful backing of Coinbase and Cloudflare—signals that the Pandora’s box of autonomous AI agent payments has been opened.
Looking ahead, as the x402 ecosystem continues to evolve, we can expect more innovative applications to emerge, collectively building a smarter, more efficient digital financial future.
