▸ HTTP-NATIVE PAYMENTS · BASE NETWORK · x402

THE
PROTOCOL

Vellum is built on x402 — the HTTP-native payment protocol for the internet. Named after the dormant HTTP 402 status code "Payment Required", it lets any HTTP request carry real payment intent natively.

HOW IT WORKS
01PAYMENT FLOW x402 PROTOCOL

No wallets to connect manually. No pop-ups. No approvals. On-chain payments as frictionless as a REST API call — so AI agents can execute them with zero human intervention.

Every payment goes through Vellum's x402 middleware, which handles signing, routing, and on-chain confirmation on Base — Coinbase's Ethereum L2.

Confirmations take roughly 2 seconds. Fees are a fraction of a cent. Gas is abstracted away entirely.

Origin App or AI Agent
x402 Payment Request
Middleware Vellum x402 Layer
Signed Transaction
Network Base (Ethereum L2)
On-chain Confirm
Result Payment Verified ✦
TECH SPECS
02NETWORK SPECS BASE MAINNET
  • NetworkBase (Ethereum L2)
  • Chain ID8453
  • Protocolx402 · HTTP-native
  • AssetsETH · USDC · Any ERC-20
  • Confirmation~2 seconds
  • GasAbstracted · Sub-cent fees
  • Wallet typeEOA · Non-custodial
  • LicenseMIT · Open source
WHY BASE
03WHY WE CHOSE BASE COINBASE L2
⚡
Speed

~2s finality. Fast enough for real-time agent decisions and human UX.

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Cost

Sub-cent fees make micro-transactions and high-frequency agent payments viable.

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Security

Ethereum-secured. Backed by Coinbase. Built for the next billion users.