x402 has been everywhere these days — Coinbase’s new open payment protocol

Lately, x402 has been trending continuously. Introduced by Coinbase in early 2025, this open payment protocol creates a blockchain-agnostic micro-payment system, drawing inspiration from the HTTP 402 status code as its conceptual foundation.

Designed for AI agents and autonomous payments, the protocol enables instant settlement in stablecoins like USDC without requiring account registration, subscriptions, or complex signature processes. x402 represents a novel transaction model that bridges Web2 and Web3.

Envision a future where an on-chain AI receives your instruction to purchase a MacBook, configures it with specific specifications, searches the web for the best price, and instantly pays the chosen merchant via the x402 protocol.

No platform account needed, no dependency on subscriptions or credit cards. x402 simply pays on behalf of your agent.

We are living in an extraordinary era where AI will permeate every aspect of daily life.

What is the x402 protocol?

Simply put, x402 is Coinbase's new payment protocol that allows AI agents to pay for services using USDC or similar stablecoins within seconds, eliminating the need for account creation or subscriptions. Its concept stems from the nearly forgotten HTTP status code: 402 Payment Required. Coinbase has revitalized this idea, aiming to make payments as seamless as requesting a web page—an Internet-native primitive.

Currently, ordinary users should focus on three key areas: payments, AI identity, and funds provenance/tracing.

The three core roles in x402

• Buyer: the AI agent
• Seller: the service provider
• Transaction channel: the x402 protocol

Technical references:

• EIP-3009 spec: https://eips.ethereum.org/EIPS/eip-3009
• ICRC-1 standard: https://github.com/dfinity/ICRC-1
• x402 protocol docs: https://github.com/coinbase/x402
• ICP developer docs: https://internetcomputer.org/docs

For instance, consider a meme project called Ping. Traditionally, users would register accounts and complete KYC to access services or tokens (PING). With x402, purchases are direct. In this scenario:

• Buyer: a player
• Seller: the meme project team
• Channel: x402 protocol

The transaction flow resembles familiar on-chain transfers but utilizes x402 instead of ERC-20 processes. Primarily, x402 facilitates autonomous on-chain transactions for AI agents.

AI agents + crypto: a new stablecoin payment flow

Core characteristics

• Machine-to-machine payments: AI agents autonomously complete commercial transactions.
• Cross-chain compatibility: Supports Base, Solana, Polygon, NEAR, and others.
• Enterprise-grade backing: Involves Coinbase, Cloudflare, Visa, Google, AWS, and similar entities.
• Open standard: The x402 Foundation drives ecosystem development.

Notable ecosystem projects performing well with x402

PayAINetwork ($PAYAI)

• Market cap: ≈ $4.8M (fully diluted)
• Funding: $5M seed round led by Borderless Capital (May 2025)
• Core business: B2B/B2C agent marketplace where autonomous agents settle payments in USDC via x402
• Tech progress: v1 PayAI accelerator deployed on Base; processed over 42,000 autonomous microtransactions since July 2025

daydreamsagents ($DREAMS)

• Market cap: ≈ $7.6M
• Funding: Angel round with participation from Solana Ventures and Archetype (Apr 2025)
• Core business: TypeScript-first framework; DREAMS Router handles USDC micro-payments via x402 for model inference
• Tech progress: Router migrated from testnet to Base mainnet; exceeds 1.3 million model calls monthly

peaq ($PEAQ)

• Market cap: ≈ $50M (circulating), ≈ $324M fully diluted
• Funding: Approximately $43M total raised, including a $15M strategic round by Borderless & Generative Ventures
• Core business: DePIN-focused L1; integrated native x402 support in Aug 2025
• Tech progress: Supports M2M payments for over 850,000 connected devices; two DePIN dApps transitioned to x402 payment flows

GoKiteAI

• Funding: $18M Series A led by General Catalyst & PayPal Ventures
• Core business: "The agent internet base layer"—provides agent identity, programmable permissions, and payment infrastructure
• Token plan: Tokenomics published; TGE planned for Q1 2026

Other chain projects—examples below:

Questflow — a multi-agent economy driven by x402

This on-chain multi-agent orchestration platform enables agents to coordinate, execute tasks autonomously, and generate economic value without human intervention. Central to it is $SANTA—a cluster of 13 autonomous agents owned by Questflow and published via @virtuals_io.

AurraCloud ($AURA) — agent orchestration layer for x402

Builds an orchestration layer for AI agents, deployable and manageable in minutes, integrating MCP and crypto APIs. With smart wallets, agents autonomously pay for services and execute transactions without human involvement.

mrdn_finance ($MRDN) — x402 payment coordinator (flagship)

A flagship x402 project incubated by UOS, featuring mechanisms including:

• 1% protocol treasury fee to establish long-term fiscal stability.
• 2% cashback rewards (gradually decaying with a halving schedule) to encourage early adoption.
• $MRDN per-transaction rewards to attract developers and agent builders.
• Multi-chain support: Base, Optimism, Unichain—expanding x402 across superchains.

itsgloria_ai ($GLORIA) — x402 data & API hub

Serves as the data and API center for the x402 ecosystem, enabling agents to access and transact real-time data on a pay-per-use, trustless basis. This bridges the data economy with the agent economy, allowing information monetization for agents.

The first x402 meme — pingobserver

How can ordinary people participate early in x402?

x402 remains in its early stages but embodies a convergence of payments + machine/AI + on-chain settlement, aligning with future trends. Early adopters—developers, websites, and AI agents—gain first-mover advantages. As chain-level infrastructure, x402 resembles a fundamental technological shift more than a typical speculative token project.

Capital quickly identifies opportunities—x402 concept plays are emerging in public markets. On-chain represents a blue ocean, with key exchanges and infrastructure players racing to establish foundations—

For newcomers without accounts, start by researching—such as this overview: 2026 Latest Top 10 Cryptocurrency Exchange Rankings 🔥【Must Save】, pre-register where applicable, and conduct basic due diligence to position yourself in this emerging blue ocean.