AI brokers are already shopping for and promoting from one another thousands and thousands of occasions a day, and the cryptocurrency settling these offers was determined months in the past with out a lot fanfare. The winner may shock you, and the true battle has quietly shifted…
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Software program has been transacting with different software program for a yr, and most of the people are unaware of it. By late April 2026, Coinbase reported 69,000 energetic brokers and 165 million transactions, totaling round $50 million in cumulative quantity utilizing its x402 standard. In every of these transactions, each the client and vendor are applications, and the common switch quantity is only a fraction of 1 cent.
So which cryptocurrency is used to settle these payments? The simple reply is that the competition for dominance concluded in the second quarter of 2026. USDC (CRYPTO:USDC) has taken the lead in the market, whereas XRP (CRYPTO:XRP) and Solana (CRYPTO:SOL) are actually taking part in for totally different stakes.
Dominates Agent Funds
Circle’s current press materials revealed that USDC accounts for 98.8% of agent-driven transaction quantity. In a previous assertion, CEO Jeremy Allaire famous that this determine had reached 99.3% for funds made by AI brokers utilizing x402 in the second quarter of 2026.
This dominance was not unintended. Circle launched its Agent Stack in Might 2026, offering builders with policy-controlled wallets, nanopayments, and a market, which now helps over 900 paid companies. USDC’s circulation reached $73.3 billion, and transaction quantity rose 151% over the yr.
Chainalysis tracked over 100 million cumulative x402 transactions on Base by way of the primary quarter of 2026, however cautioned that a lot of the late-2025 surge was due to meme coin exercise. Thus, the precise working market is smaller than the transaction rely may indicate.
Why a Stablecoin Wins in a Market of Tiny Transactions
AI brokers often purchase information feeds, computing cycles, API calls, and mannequin inference companies, which is the technical time period for requesting a educated mannequin to generate a solution and paying for that response. Every of those companies has a low worth level and is commonly consumed hundreds of occasions a minute.
For example, if a service quotes an API name at $0.0004, that worth should maintain fixed even a minute later. Solely a token pegged to a forex can present this stability, which issues earlier than you contemplate components like transaction velocity or charges. A unstable asset would flip every bill right into a guess on the denominator.
The x402 customary is constructed on the HTTP 402 Fee Required response. When a server sends again a 402, the agent reads the cost directions, indicators a stablecoin transaction, consists of proof, and retries the request. Coinbase built-in stablecoin performance into the reference implementation, settling this concern earlier than any developer started working with the specification.
Coinbase created and open-sourced x402 in Might 2025, introduced a basis with Cloudflare in September, and transferred governance to the Linux Basis in April 2026. By that point, 5 deployments have been operational, together with Coinbase’s Agent.market, Stripe Machine Funds, CoinGecko’s paid endpoints, and the Cloudflare Agents SDK.
XRP and Solana Are Competing for Totally different Roles
Inside agent stacks, transactions sometimes default to Base for Ethereum-compatible duties and Solana for high-throughput circumstances, with the precise cost nonetheless settling in USDC. Solana gives confirmations in about half a second, whereas Base takes roughly two seconds, each at very low gasoline prices. In distinction, Ethereum’s principal chain is supported however is simply too pricey for sub-dollar transactions.
So, whereas Solana is successful a spot in this market, it capabilities as a routing chain reasonably than the asset used for funds, and people are separate enterprise fashions with separate economics.
XRP took longer to enter this area and got here from a distinct perspective. Ripple adopted the x402 customary in June 2026 and joined the Machine Payments Protocol on September 17, permitting XRP to serve a operate no different asset on its ledger can carry out, which is streaming cost classes. Whereas RLUSD can deal with one-off funds, session streaming requires a future improve from Ripple, which has but to be scheduled.
| Asset | Share of Agent Quantity | Position in Stack | Restrict |
|---|---|---|---|
| USDC | 98.8% | Settles funds | Depending on Circle as issuer |
| Solana | Not a settlement asset | Offers high-throughput routing | Native token worth can fluctuate towards invoices |
| XRP | Not measurable but | Streams cost classes | Joined the usual in September 2026 |
Which Coin Wins in Agent Funds?
USDC has emerged because the clear chief, accounting for 98.8% of agent-driven quantity, which leaves no significant competitors for the settlement asset. The market resolved that query in the second quarter.
The chain beneath stays open, and that’s the place the following two years get determined. Circle is growing Arc to management each the infrastructure and the token, Ripple helps competing requirements so the XRP Ledger stays reachable whichever approach builders go, and Solana already carries a share of the routing.
A holder who assumes the combat is over the coin watches the fallacious quantity. The one which counts is which chain the reference shopper selects first, as a result of no matter it picks turns into the behavior for thousands and thousands of day by day funds.
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