Brian Armstrong Says Coinbase Processes $1T in Stablecoin Payments Annually

Coinbase CEO Brian Armstrong disclosed three platform-scale figures on Thursday, giving the most detailed public accounting to date of how deeply stablecoins and agentic payments have embedded in the exchange's operations.

Armstrong's post on X quoted an article by Alec Lovett, Coinbase's Head of Infrastructure Products.

“Stablecoins are quickly becoming the backbone of how money moves globally,” Lovett wrote. “Coinbase processes nearly $1T of stablecoin movement annually and holds nearly $20B in USDC on platform, the blockchain Base has processed $19T in stablecoin volume so far this year, and x402, our agentic payments protocol, has processed 160M+ agentic payments in the last year.”

USDC at Record Levels

Coinbase's Q1 2026 earnings deck, filed with the SEC, showed average USDC held in Coinbase products reached $19 billion in the quarter, an all-time high. More than 25% of all USDC in circulation sits in Coinbase's ecosystem, according to the same filing. Armstrong's $20 billion figure reflects a spot reading after Q1 closed, consistent with the upward trajectory in the earnings disclosure.

USDC's total circulating supply stands at $75 billion, per DefiLlama, with the majority on Ethereum at $48.5 billion. The stablecoin hit an all-time high market cap of roughly $80 billion in March 2026.

The $1 Trillion Movement Figure

The $1 trillion annual stablecoin movement figure refers to transfers flowing through Coinbase's payment infrastructure, distinct from the exchange's trading volumes. Visa processed approximately $14.5 trillion in total payment volume in fiscal 2025 and Mastercard processed roughly $9.2 trillion, per filings with the SEC. Coinbase's $1 trillion figure positions the company as a meaningful stablecoin payment rail, though still a fraction of what card networks handle annually.

Stablecoins as a category settled $33 trillion across all platforms in 2025, according to Coinbase's Q4 2025 shareholder letter, compared to Visa's $16.7 trillion in fiscal 2025.

x402's Growth Trajectory

X402, named after HTTP's long-dormant "402 Payment Required" error code, lets AI agents pay for digital resources directly within web requests. When an agent requests a paid resource, the server returns a 402 response; the agent signs a USDC payment on-chain and resubmits.

Coinbase's Q1 2026 earnings deck shows 100 million x402 payments processed through the end of Q1. A Chainalysis on-chain analysis published June 3 confirmed that figure, noting x402 volume on Base went from near-zero in mid-2025 to more than 100 million cumulative transactions by Q1. Armstrong's 160 million figure, cited as of June 2026, tracks with that progression: Coinbase's Agentic.Market launch in April already showed 165 million transactions and 480,000 agents transacting across the protocol.

The $1-or-above transaction tier now represents 95% of x402 transfer volume, up from 49% in early 2025, per Chainalysis, suggesting the protocol has shifted from micro-payment experiments toward larger commercial activity. More than 90% of x402 volume runs on Base, per Coinbase's earnings disclosure.

One caveat in the Chainalysis report: a large portion of Q4 2025's surge was driven by PING, a meme coin using x402's pay-to-mint mechanic that processed over 150,000 transactions in its first month. Organic commercial activity moderated after that burst, though week-over-week wallet retention is trending upward even without a speculative catalyst.

The x402 Foundation, which took over the protocol from Coinbase in April at the MCP Dev Summit North America, counts Google, Stripe, Visa, Mastercard, Adyen, Amazon Web Services, American Express, and Shopify among its founding members. QuickNode announced a free tier for x402 in June, offering one million requests per month per agent with no API key required.