x402 “Builders” List | Who’s Really Powering x402?

As AI advances rapidly, AI agents are evolving into independent economic actors, with needs to autonomously purchase data, access APIs, and rent computing power. Traditional payment systems, however, cannot adequately support these high-frequency, low-value, automated transactions. In response, the x402 protocol was developed.

x402 is an open-source payment protocol led by Coinbase, with support from Anthropic, Amazon Web Services, Hyperbolic, Google, and Cloudflare. Its core feature enables AI agents to perform autonomous micropayments by leveraging the HTTP 402 status code, allowing agents and software clients to directly pay with USDC—no API key required. This facilitates machine-to-machine (M2M) autonomous settlement, empowering AI agents with true payment capabilities.

The article “PayAI Surpasses PING! x402 Ecosystem Value Anchor Shifts“ explores the shifting momentum between PING and PayAI, highlighting a crucial point: the x402 ecosystem is transitioning from concept to reality, moving from hype to practical application.

This piece focuses on x402 ecosystem projects categorized as “infrastructure” and “execution” (excluding the main x402 developers). It’s important to recognize that the x402 ecosystem remains in a nascent stage—its infrastructure is incomplete, commercial viability unproven, and there is no mature reference for project selection. It’s too early to judge which projects will succeed. The key is whether a product creates real demand, and whether that demand is both essential and frequent enough to drive users and AI agents to utilize x402 for payments, avoiding the pitfall of false demand. Additionally, it’s vital to assess if the product has a clear, sustainable path to profitability to support long-term operations.

x402 Facilitators / Services / Endpoints

Kite AI

Kite AI is building the foundational transaction layer for the Agentic Internet, providing unified identity, payment, and governance infrastructure for autonomous agents. On February 10, 2025, Kite AI launched the PoAI (Proof of AI) L1 sovereign blockchain testnet.

Kite AI is natively integrated with the x402 agent payment standard, positioning itself as the protocol’s primary execution and settlement layer. This allows AI agents to seamlessly send, receive, and reconcile payments through standardized intent-based instructions.

In September 2025, Kite AI announced a $33 million funding round, with $18 million raised in Series A led by PayPal Ventures and General Catalyst. These funds will accelerate Kite AI’s work on the Agentic Internet. Subsequently, Kite AI received strategic investment from Coinbase Ventures to support the development of its autonomous AI agent payment infrastructure, with collaboration to drive mass adoption of the x402 protocol.

Further reading: “When Machines Start Paying: Kite AI and the Foundation of Agentic Payments“

Questflow

Questflow specializes in building the orchestration layer for multi-agent economies, enabling AI agents to autonomously research, execute actions, and earn on-chain rewards. It supports collaboration among agents, integrates services across Web2/Web3, and facilitates agent-to-agent payments and monetization via the x402 protocol.

A key participant in the x402 ecosystem, Questflow also partners on Google’s agent payment protocol (AP2). Recent developments include expanding x402 support to Mantle and X Layer chains.

Questflow’s autonomous agent network S.A.N.T.A operates as a core component of the Virtuals protocol, serving as a gateway for x402. S.A.N.T.A is rolling out the SANTA multi-chain Facilitator, currently supporting the Mantle network.

On the funding front, Questflow raised $1.5 million in an angel round in July 2024 led by MiraclePlus (founded by former Microsoft EVP, YC partner, and Baidu COO Lu Qi). In July 2025, it closed a $6.5 million seed round led by cyber•Fund, with Delphi Labs and grants from Aptos, Coinbase Developer Platform, and Virtuals Protocol.

Questflow does not have its own token, but its S.A.N.T.A token currently has a market cap of $11.6 million.

Crossmint

Crossmint is an enterprise API platform for wallets, stablecoins, and agentic commerce. In March 2025, it announced $23.6 million raised across seed, Series A, and strategic rounds, led by Ribbit Capital, with Franklin Templeton, Nyca, First Round, and Lightspeed Faction participating. In September, Crossmint received strategic investment from Circle Ventures.

Crossmint enables businesses to easily create embedded wallets (custodial or non-custodial), issue and distribute NFTs, and manage on-chain credentials. It also provides dedicated APIs for AI agents to autonomously manage funds, execute transactions, and access digital credentials.

Previously, Crossmint released a demo agentic commerce implementation on Base app using the XMTP protocol, featuring a custom “x402 Server” payment processor for crypto-to-Amazon payments.

Next, we introduce x402 Facilitators—service providers supporting x402 payments on Solana and EVM networks, offering unified endpoint access for on-chain verification and settlement of HTTP resource payments under the x402 protocol.

Source: x402scan

These Facilitators form the core infrastructure layer of the x402 payment ecosystem, responsible for validating and settling on-chain payments for HTTP resources via the x402 protocol.

PayAI (Token Market Cap: $27.3 Million)

By transaction volume, PayAI is now the largest x402 Facilitator after Coinbase, supporting Base, Solana, Polygon, and other networks. As of this writing, PayAI has processed 13.78% of all x402 transactions, representing 13.27% of total transaction value. Meanwhile, Coinbase’s market share by transaction value has dropped to around 80%.

Beyond x402 payments, PayAI offers:

• x402 Echo Merchant: Enables end-to-end testing of any x402 client.
• Freelance AI: An AI agent marketplace built on open tech such as libp2p, IPFS, ElizaOS, and Solana, enabling agents to offer services, find experts, and securely handle payments.

PayAI is developing additional features:

• CT Agent monetization.
• Token Gateway: Enables merchants to accept payments in their own tokens and grant feature access to token holders.

PayAI tokenomics feature a total supply of 1 billion tokens, all circulating at launch (March 2025). The PayAI team will purchase 20% of the supply for the project treasury, allocated for operations, marketing, and future releases such as community rewards and partnerships. Half of the treasury tokens provide liquidity to generate fees; the other half vests linearly over one year.

x402.rs

x402.rs is designed for crypto-native APIs, pay-per-request services, and autonomous agents, and also operates as a x402 Facilitator.

thirdweb

thirdweb, a Web3 developer platform, has recently expanded into x402, including:

Support for x402 payments in the thirdweb SDK, enabling developers to monetize backend and agent services with seamless, automated crypto payments.

Launch of Nexus, allowing AI agents to access services without accounts or API keys—i.e., endpoints are monetized via x402, enabling agents to instantly discover and pay for API access. thirdweb reports its dedicated gasless Facilitator wallet supports over 80 chains and 4,000 tokens.

Corbits

Corbits is focused on “Agentic Commerce” software. Its strength is the open-source, modular Faremeter framework, purpose-built for x402, supporting agent-driven transactions and flexible plugin-based integration with any payment standard, network, or wallet, enabling rapid adoption of new payment methods and digital assets. Corbits primarily builds on Polygon and Solana.

Notably, at the end of October, Corbits partnered with AI project Dark (@darkresearchai) to launch the open-source agent and mobile toolkit Mallory, combining AI chat with real-world functionality, powered by x402 and built on React Native.

For example, chatting with Mallory triggers real actions—such as using Nansen to analyze on-chain data—without requiring any subscription.

Daydreams (Token Market Cap: $12 Million)

Daydreams.Systems builds autonomous agents and applications on x402 payment rails, currently supporting Base, Solana, and Starknet.

Its ecosystem centers on three open-source tools: the Daydreams agent framework, Daydreams Router, and autonomous agent operations platform LUCID.

Daydreams enables building autonomous AI agents with a composable Context architecture, modular components, real memory, MCP integration, and TypeScript-first design. In July, Daydreams.Systems launched Daydreams Router, a crypto-native gateway to models like GPT, Claude, Groq, Gemini, and Gwen, with smart routing and instant USDC settlement for model requests, powered by x402. The upcoming LUCID will combine AI, x402, and ERC-8004.

Daydreams.Systems is also a x402 Facilitator, currently supporting Solana, Base, and Abstract.

As of this writing, the DREAMS token has a market cap of $12 million.

AurraCloud (Token Market Cap: $7.5 Million)

AurraCloud specializes in x402-driven AI agent infrastructure, allowing users to create AI agents in minutes and offering hosted MCP tools, smart wallet functionality, x402 payments, and x402-gated inference services.

AurraCloud also serves as a x402 Facilitator, enabling merchants and enterprises to quickly accept crypto payments.

The AURA token currently has a market cap of $7.5 million.

Mogami

Mogami is building an open-source software stack for the x402 protocol, offering Java-based SDKs, tools, and services.

Mogami’s core products include the Mogami x402 SDK, x402 payment gateway “Mogami Facility Server,” and x402 console, also serving as a x402 payment facilitator.

AEON

AEON builds a full-chain crypto payment framework, providing the AEON Pay orchestration solution that connects crypto payments with global fiat processing for seamless on-chain/off-chain settlement. AEON also offers Stripe-like experiences via AEON Checkout and AEON AI Payment, giving Web2/Web3 merchants and AI agents robust crypto checkout infrastructure.

On October 28, AEON launched a x402 Facilitator on BNB Chain, enabling AI agents to safely and verifiably conduct on-chain transactions. Every transaction generates an immutable receipt containing the agent’s unique identity (per ERC-8004), creating tamper-proof audit trails for accountability and reconciliation. Beyond BNB Chain, AEON will continue to expand x402 and its AI payments across multiple blockchains.

AEON was previously selected for BNB Chain’s Season 10 “Most Valuable Builder” accelerator.

Others

Firecrawl

Firecrawl provides simple APIs and SDKs for AI platforms, converting websites into LLM-ready data (Markdown, JSON, HTML, images, and news).

Recently, Firecrawl added an x402-enabled endpoint using the x402 payment standard, allowing any agent with a wallet to conduct web searches and optionally crawl results. Prices are displayed via HTTP 402 requests, USDC payments settle on-chain, and results are returned automatically.

In August 2025, Firecrawl raised $14.5 million in Series A funding led by Nexus Venture Partners, with investors including Y Combinator, Zapier, and Shopify CEO Tobias Lütke.

Heurist (Token Market Cap: $6.7 Million)

Heurist is developing full-stack AI infrastructure: Heurist Cloud (API access to AI models), Heurist Mesh (agent marketplace), and Heurist Chain (ZK Layer-2 for agent payments).

Heurist integrated x402 into Heurist Mesh and Deep Research. Heurist Mesh lets agents autonomously transact, build professional tools, and settle payments on-chain; Heurist Deep Research is an AI-powered research platform for Web3, charging 1 USDC per query via x402.

The HEU token has a max supply of 1 billion, serving for AI service payments, staking, governance, and as gas for Heurist Chain.

t54.ai

t54.ai focuses on building the trust layer for “trusted agent finance,” providing security infrastructure for x402, helping AI agents mitigate risk in autonomous payments and transactions, and enabling frictionless agent economies.

Its core product, x402-secure, enhances x402 protocol security, offering programmable trust, verifiable payments, and pre-settlement protection via its native risk engine Trustline.

t54.ai also provides a dashboard for x402 ecosystem health.

Tools

x402 Ecosystem

x402 Ecosystem is Coinbase’s official x402 aggregation site, listing innovative projects, tools, and applications across client integration, services/endpoints, infrastructure, learning/community resources, and facilitators.

x402scan

x402scan is an x402 ecosystem monitoring and analytics tool by Merit Systems, supporting Base and Solana.

x402scan acts as an “on-chain browser + agent dashboard,” tracking all x402 payments, agent activity, transactions, and facilitators in real time to help developers, agents, and users gain insight into agentic commerce operations.

x402station

x402station is a comprehensive x402 analytics platform for monitoring services, tracking performance, getting real-time insights, and exploring pay-per-use APIs powered by x402.

x402 Extensions

Vistara Labs / b402

Vistara Labs was selected for Binance Labs Season 6 incubation (September 2023) and completed a Pre-Seed round in November 2023 led by D1 Ventures and Factor.

Vistara Labs is an internet agent execution layer. Its Vistara OS transforms passive browsing into real-time deployment, remix, and monetization, powered by Zara Agents Engine.

The Vistara Labs autonomous development factory zara recently enabled seamless agent payments via x402, supporting one-click deployment for AI-driven Web3 micro-businesses (like content monetization).

On October 25, 2025, Vistara Labs announced that b402 will bring x402 to BNB Chain, supporting agent payments with all BEP-20 tokens primarily through the B402 relay as a trusted intermediary. Most BEP-20 tokens lack EIP-3009 and can’t natively handle signed “authorized transfer” operations.

The ZARA token now has a market cap of $1.8 million, with recent declines possibly linked to its removal from the Vistara Labs official Twitter bio.

Pieverse

Pieverse will launch the x402b protocol this month, bringing x402 to BNB Chain via the Pieverse Facilitator.

Pieverse supports gasless payments using the EIP-3009-enabled USDT wrapper pieUSD. Its custom Facilitator automatically generates jurisdiction-compliant receipts during payment settlement and immutably stores them on BNB Greenfield, solving tax and audit challenges.

Pieverse raised $7 million in strategic funding in late October, led by Animoca Brands and UOB Ventures, and previously received support from Binance’s MVB Season 9 program.

Pieverse held a Pre-TGE event in Binance Wallet on October 29, 08:00–10:00 UTC.

Further reading: “What’s Behind Pieverse Catching the x402 Wave Right Before Pre-TGE?“

Meridian (Token Market Cap: $2.9 Million)

Meridian is a blockchain project focused on the x402 payment protocol, tailored for the agent economy.

Meridian chose Across to implement its x402 protocol, stating that “when payments need to move between different EVM networks with distinct RPC configurations, Across is the best technology for fast settlement of agent and human transactions on x402. Sending from L2 to Ethereum faces a fraud-proof window, sometimes requiring up to 7 days to settle. Meridian uses Across to bypass this window entirely, supporting all EVM chains for rapid settlement. This also enables agents using x402 to pay each other with tokens beyond USDC.”

The MRDN token currently has a market cap of $2.9 million.

Summary

Although the x402 protocol has garnered support from major tech companies and crypto projects, and ecosystem participation is expanding, x402 remains in an early stage of development.

The community is sharply divided on x402, with optimism for a new agent economy paradigm contrasted by skepticism about protocol maturity, real-world value, and dispute resolution.

According to the x402 roadmap, the protocol will explore x402 Bazaar and ERC‑8004 integration, e-commerce refunds and escrow, support for arbitrary tokens, and Facilitator Router in 2026—issues of high user interest.

Progress on these roadmap items marks the evolution of the x402 ecosystem from concept to infrastructure, then to real-world application and ecosystem maturity. If achieved on or ahead of schedule, these milestones will further validate x402’s feasibility and value as the payment standard for the agent economy, accelerating the transition of the AI agent ecosystem from experimentation to commercialization.

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