Agents can’t use credit cards or navigate subscription flows. They move on, and take their revenue with them.
Your free tiers get spammed by automated crawlers. You pay, agents don’t.
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.
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.
An agent calls your API (e.g., Python or Node).
The SDK inserts a PAYMENT-REQUIRED header with the price and accepted assets.
The agent signs the authorization off-chain and retries the request with a PAYMENT-SIGNATURE.
The SDK settles the payment via a facilitator (Coinbase, PayAI, AltLayer) and lets the request pass to your endpoint.
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Failover across verification providers ensures no missed payments and no outages. If the primary facilitator fails, the SDK immediately routes to a backup.
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.
Configure your security level:
- Instant: Accept unconfirmed transactions for real-time speed.
- Finalized: Wait for block confirmations to secure high-value data delivery.
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Track revenue, audit failed payments, and debug in real-time, no extra tooling needed.
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"
}));
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.
Building blocks for the decentralized future
Nethermind © 2025
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