Pieverse is an on-chain payment protocol that uses x402b to enable auditable, gas-free payments. It also timestamps value through on-chain invoices, receipts, and checks.

PING is the first token launched based on the Internet's native payment protocol x402. Its birth was accompanied by multiple operational problems such as insufficient funds and server crashes in the x402 protocol facilitator. The token has no real function and is designed to convey an early adopter vibe of the x402 protocol.

b402 is a complete internet-native payment infrastructure built on the BNB Chain, inspired by the HTTP 402 standard and x402 protocol.

x402scan is an open-source x402 ecosystem browser designed specifically for the x402 protocol to track and explore payment transactions, server activity, and resource usage in AI agents.

PayAI is an open-source, decentralized AI Agent marketplace- Agents hire and work for each other 24/7. Built on ElizaOS, libp2p, IPFS, and Solana.

Quack AI is a governance layer for the agent economy. It enables verifiable, gas-free transactions, and policy-based automation through its x402 signatures, facilitator relay system, and on-chain policy engine. The project connects AI agents, users, and applications under transparent, auditable rules across multiple blockchains.

Keyless is a wallet-signed AI platform powered by x402 mechanism where users Train → Earn → Generate. Users wallet acts as the API key; contributions to model training earn on-chain points, which replace API credits for text/image/code/audio generation. while held up Privacy-first (federated learning + differential privacy) with public mint/burn receipts.

AEON is the next-generation crypto payment framework, built for AI to drive intelligent, automated payments across Web3 and simplify how crypto works in real life. With omni-chain support, AEON's AI Payments system allows intelligent agents to manage and automate transactions, payments, subscriptions, and remittances for users.

Vend is building the infrastructure to bring unmanned businesses on-chain — enabling anyone to fund, own, and earn from real-world machines like laundromats, vending systems, and kiosks. With its flagship digital dollar vndUSD users can spend, stake, and earn yield, turning everyday payments into sticky rewards, real ownership, and passive income.

Onchain is an intelligent intermediary layer for x402 payments. Instead of integrating with a single facilitator (Coinbase CDP, x402.rs, etc.), integrate once with Onchain and get automatic routing across multiple facilitators with failover, cost optimization, and speed prioritization.

Meridian is a layer built on top of Base that introduces receiver wallet architecture for x402 payments. Unlike direct wallet-to-wallet transfers, Meridian’s proxy facilitator creates isolated receiver balances with built-in fee management and withdrawal controls.

AurraCloud is a platform for rapidly building and deploying AI agents, designed for the x402 protocol, enabling AI agents to pay and monetize autonomously.

Splendor is an AI-powered blockchain with real-time GPU acceleration and military-grade quantum resistance, enabling the next generation of AI agents, autonomous systems, and intelligent applications. Splendor is purpose-built for the AI-native internet, where intelligent agents communicate, transact, and collaborate autonomously.

Thirdfy is a decentralized exchange protocol governed by artificial intelligence.

RPC x402 is a pay-per-call RPC service based on the x402 protocol, designed to provide blockchain developers with a JSON-RPC endpoint that supports instant, automated stablecoin payments without the need for subscriptions, account registrations, or wasted credit.

402Gate is a decentralized paywall protocol that transforms how the internet handles value exchange. Powered by Solana, it introduces a frictionless pay-per-use model where users or even AI agents can instantly unlock content, APIs, or computation by sending micro-payments in $X402, USDC, or SOL.

Fluora is a peer-to-peer proxy marketplace based on standards such as x402 and MonetizedMCP, designed to enable AI agents to discover, negotiate, and purchase services autonomously, enabling seamless programmatic economic transactions.

402rush.fun is a Launchpad platform on Base powered by x402.

Hetu builds Deep Intelligence Money — the AI-Native Monetary Stack unifying verification, settlement, and financing for the intelligence economy. By combining an EVM-compatible causal-DAG with Proof of Causal Work, Hetu bridges Ethereum liquidity with the AI economy, enabling autonomous agents to verify outputs, transact instantly, and finance future work.

x402 is an autonomous payment protocol that supports AI, websites, and applications to automatically send and receive payments, provides programmable settlement and multi-chain compatibility, and is committed to building automated decentralized payment solutions.

xPlug is a plug-and-play payment platform built on Solana and powered by the x402 protocol, enabling instant, verified, and low-cost decentralized payments for everyone.