No gas.
No fees.
Just USDC.

The first payment rail where USDC is the only token anyone ever needs to hold. Open standard. 0% fee. Non-custodial.

Read the docs
no gas token

Hold USDC. Send USDC.

End of crypto wallet checklist. No ETH. No gas coin of any kind. No bridges, no swaps, no "first you need ETH to send USDC" chicken-and-egg.

no platform fee

0%. Forever.

Not a launch promo. There's no Xenarch contract in the money flow, so there's no surface to charge from. Structural, not promotional.

no custody

Wallet to wallet, direct

Xenarch never holds, signs for, or touches a cent. Every payment lands on-chain in your wallet — verifiable on Basescan.

Three ways to use the rail
Gating

Your content trains AI. Make it pay.

Detect crawler traffic. Return HTTP 402. Settle in USDC per request — direct to your wallet. Works on any host.

WordPress · Joomla · FastAPI · Cloudflare Worker · pay.json
See gating →
Payments early access

Sell anything. Keep 100%.

Subscriptions, e-commerce, invoices, donations, tickets. Host it, embed it in your site, or call it from your API. Anyone — agent or human — pays in USDC.

Hosted · Embedded · API · SDK · CMS plugins · x402
Join the waitlist →
Agents

Let your agent spend. Without losing sleep.

Hard caps. Allowlisted scope. A signed receipt for every payment. Drops into Claude, Cursor, LangChain, CrewAI.

MCP · Python · LangChain · CrewAI · AutoGen · LangGraph
See agent wallets →
Landscape
xenarchUSDC · 0% · no gas · non-custodial · open standard · any host
cloudflare ppcgating only · cloudflare-only · custodial · takes a cut
stripe MPPclosed protocol · settles on Tempo (Stripe-co-owned L1) · custodial · Stripe pricing
tollbitenterprise gating · no micropayments · licensing model

This site speaks to agents

live
/llms.txtEntity summary, structured for LLMs
/.well-known/pay.jsonMachine-readable pricing (open standard)
/.well-known/mcp.jsonMCP server package + tools
/.well-known/ai-plugin.jsonChatGPT plugin manifest
HTTP Link: headersProtocol-level agent discovery
schema.org JSON-LDOrganization, Service, FAQPage
robots.txtGPTBot, ClaudeBot, PerplexityBot — all allowed
Questions
What is x402?
Open protocol for resolving HTTP 402, governed by the Linux Foundation's x402 Foundation. Client signs an EIP-712 USDC payment authorization, sends it in the X-Payment header, retries. Settles on Base L2. More on HTTP 402 →
How can payments be 0% fee?
Xenarch is not in the money flow. Every payment goes wallet-to-wallet on-chain. No Xenarch contract takes a cut, no balance sits with us. Structural, not promotional.
How can payments need no gas token?
USDC on Base is the only token you hold. The settlement layer handles on-chain submission so your wallet stays single-asset — no ETH, no SOL, no gas coin of any kind.
Is Xenarch a wallet?
No. Xenarch is the payment infrastructure between wallets you already control. Never holds, signs for, or touches funds. Every payment verifiable on Basescan.
Which network and asset?
USDC on Base mainnet, chain 8453. Direct wallet-to-wallet settlement. Verifiable on Basescan.
Listed on
For agent developers
smithery / glama / npm / pypi / github
For publishers
wordpress / joomla / pypi / plugins