The payment rail for the agentic internet

Any wallet pays any wallet — agent ↔ agent, agent ↔ human, human ↔ human. USDC end to end. No gas, no fees, no custodian, no KYC, no border. Open standard, on Base.

live Base mainnet chain 8453 USDC x402 dashboard · Jun 21
Read the docs

What this rail does that no other does

Structural, not promotional — the math, not the marketing.
USDC only
The only token any wallet holds — no second token to send it.
0% fee
No Xenarch contract in the money flow. No surface to charge from.
Non-custodial
Wallet to wallet, direct. Every payment lands on Basescan.
Borderless
Address is the destination. No SWIFT, no correspondent banks, no FX.
Permissionless
No KYC for the payer. No merchant account. Just a wallet.

Gating — for publishers

AI reads. AI pays.

AI agents are the new dominant readers of the web. Detect crawler traffic, return HTTP 402, settle in USDC per request — direct to your wallet.

install
WordPress Joomla Cloudflare Worker FastAPI pay.json
fee
0% Xenarch fee. 100% to publisher. Min charge $0.001.
See gating

Payments — for sellers

One link. Humans pay. Agents pay.
early access

The same URL is paid by humans through a hosted checkout, and by agents programmatically via x402 — same destination, same wallet. Outcome bounties + performance pricing for AI-native marketplaces ship on the same rail.

kinds
subscription · checkout · invoice · donation · ticket · bounty · API metering · paywall · wallet-topup · quick-charge · content-gate
integrate
hosted URL · embedded script · API & SDK · agent-callable
Join the waitlist

Agents — for builders

Make your agent an economic peer.

Your agent isn’t a tool anymore — it transacts. Hard spend caps, allowlisted scope, signed receipts. Member-since trust on every counterparty before any payment signs. USDC only, no gas token.

install
npx @xenarch/agent-mcp
stack
Claude Cursor LangChain CrewAI LangGraph
+ AutoGen
See agent wallets

How this compares

Why this slot wasn’t filled before.
Xenarch
USDC · 0% · non-custodial · borderless · open
Cloudflare PPC
gating only · Cloudflare-only · custodial · takes a cut
Stripe MPP
closed protocol · settles on Tempo (Stripe-co-owned L1) · custodial · Stripe pricing
Stripe ACP · Google AP2 · Visa TAP · PayPal SDK
card-rail agent checkout · KYC, accounts, 2–3% + ~$0.30 floor · cards architecturally cannot do account-less sub-$1
TollBit
enterprise licensing · manual contracts · no micropayments

How xenarch.com talks to agents

We expose the same surfaces we sell.
live

We expose the same surfaces we sell. Every page lets any AI agent (or crawler) discover what we do and what it costs — without our help. Each path below is live on this domain — click to inspect.

/llms.txt
Entity summary, structured for LLMs
/.well-known/pay.json
Machine-readable pricing (open standard)
/.well-known/mcp.json
MCP server package + tools
/.well-known/ai-plugin.json
ChatGPT plugin manifest
/.well-known/agent-card.json
A2A agent card
Link: headers
Protocol-level discovery on every response
schema.org JSON-LD
Organization · Service · FAQPage
/robots.txt
GPTBot · ClaudeBot · PerplexityBot — all allowed

Questions

what is x402
Open protocol for HTTP 402, governed by the Linux Foundation’s x402 Foundation. Client signs an EIP-712 USDC authorization, sends it in X-Payment, retries. Settles on Base L2. More →
0% how
No Xenarch contract in the money flow. Every payment goes wallet-to-wallet on-chain. Structural, not promotional.
no-gas how
USDC is the only token any wallet holds. The settlement layer handles on-chain submission so the wallet stays single-asset.
custody
None. Xenarch never holds, signs for, or touches funds. Every payment verifiable on Basescan.
network
USDC on Base mainnet, chain 8453. Direct wallet-to-wallet settlement.

Find us on

agent devs
smithery glama npm pypi github
publishers
WordPress Joomla Cloudflare pay.json