AI Agents & Infrastructure

Monetize the Agent Economy

Don’t let automated traffic drain your resources—turn your API into pay-per-request revenue with the x402 Seller-Side SDK to charge AI agents without wallets, gas, or blockchain infrastructure

Why most APIs loseagent revenue?

Subscription blocked

Agents can’t use credit cards or navigate subscription flows. They move on, and take their revenue with them.

Free tiers abused

Your free tiers get spammed by automated crawlers. You pay, agents don’t.

Blockchain complexity

You want to accept micropayments, but custom crypto integration is a time sink. You are spending to serve automated traffic without reaping the full benefits.

How our x402 solution works?

Drop-in, pay per-request architecture. The x402 Universal SDK is intelligent middleware that drops into your API. It handles invoicing (402 headers), verification, and failover routing automatically. No wallet code. No infra to manage. Funds go straight to you.

01 Request Comes In

An agent calls your API (e.g., Python or Node).

02 Real-Time Quote

The SDK inserts a PAYMENT-REQUIRED header with the price and accepted assets.

03 Instant Sign

The agent signs the authorization off-chain and retries the request with a PAYMENT-SIGNATURE.

04 Verified Access

The SDK settles the payment via a facilitator (Coinbase, PayAI, AltLayer) and lets the request pass to your endpoint.

Built for production-grade APIs

Zero Downtime Router

Failover across verification providers ensures no missed payments and no outages. If the primary facilitator fails, the SDK immediately routes to a backup.

Smart Pricing & Discovery

Quote per-request pricing based on payload size or compute load to maximize ROI. Includes Auto-Discovery (Bazaar) so crawler agents can automatically index and "purchase" your API.

Risk Controls

Configure your security level:
- Instant: Accept unconfirmed transactions for real-time speed.
- Finalized: Wait for block confirmations to secure high-value data delivery.

Embedded Analytics

Track revenue, audit failed payments, and debug in real-time, no extra tooling needed.

Developer first integration

Add 1 line of code to your API. Works with any existing API in Python or Node.js via middleware wrappers. The SDK abstracts the logic entirely. We rely on facilitators to sign the envelope transaction, so you never have to manage private keys or custody funds.

// Example: Node.js / Express Middleware
import { x402 } from '@x402/express';

app.use(x402({
  price: "0.001",
  network: "eip155:8453", // Base
  payTo: "0xYourWalletAddress"
}));

Powered by the builders of Ethereum

We don’t just build apps; we maintain the infrastructure they run on. The Nethermind Client currently powers ~30% of the entire Ethereum network.  

When you integrate the x402 SDK, you aren't just adding a payment gateway, you are inheriting the same reliability engineering used by the world's largest financial institutions. We understand the protocol level—from gas optimization to block finality so your API can process agentic payments with zero downtime and no missed transactions.

Join the x402 Pilot Program

We are applying our battle-tested engineering expertise to build the financial rails for AI. Join our pilot program to help shape the standard for the Agent Economy alongside a trusted infrastructure leader.

Thank you!
‍Your submission has been received!

Oops! Something went wrong while submitting the form.