Onchain Payments After "Fast and Cheap": Cards and Agents Win, But Read the Composition

Speed and cost have ceased to be differentiators

In its September 8 newsletter, Dune argued that the global spread of instant payment networks has removed always-on, seconds-to-settle, low-cost operation from the list of onchain advantages. India's UPI processes roughly 790 million transactions a day and Brazil's Pix around 250 million, both free to consumers. The US RTP and FedNow networks support transfers up to USD 10 million, RTP recently set a single-day record of USD 8.62 billion, and FedNow now counts nearly 1,700 participating financial institutions. The euro area's SEPA Instant settles within ten seconds. According to J.P. Morgan, instant payment networks are live in more than 70 countries.

Japan is no exception. The Zengin System has operated around the clock since the Moretime System went live in October 2018, with more than 1,070 participating institutions as of early 2026. An API gateway launched in November 2025, through which Wise Payments Japan became the first funds transfer service provider to connect. The room for onchain rails to win on domestic speed or cost in Japan is narrower still.

Cards are winning, but examine the fourfold increase

By Dune's count, monthly crypto card spending grew roughly fourfold from USD 126 million to USD 492 million, and in August 2026 some 142,510 users accounted for 98% of the consumer stablecoin payment volume Dune tracks. Native onchain checkout through Shopify, Stripe and similar routes totalled just USD 8.5 million. Off-ramp channels contracted across the board: onchain invoice payments roughly halved, and volume at payment service providers that collect stablecoins and disburse fiat fell about 13%. Cards added USD 366 million in net monthly volume while every other method declined by roughly USD 78 million combined.

One caveat matters. Dune notes that excluding Wirex, which saw a one-time surge in active cardholders, year-on-year card spend growth was 219%. The headline fourfold figure embeds a transient effect at a single issuer.

The structural implication matters more. What is winning is the format that connects onchain balances to existing card networks, not payment that completes onchain. Merchants remain inside the Visa and Mastercard fee structure. Onchain rails have changed where the funds originate, not the rail itself.

Transaction count and value have fully decoupled in agent payments

AI-agent payment counts surged from 39,496 a month a year ago to 15.3 million. In August, transactions below one cent made up 70.8% of all onchain payments, roughly 13.3 million of them, and 99.99% of those came from agents. Yet the combined value was about USD 35,000, and all agent payments together came to USD 643,721 — 0.13% of card volume.

The peak also requires care. Dune places the high at 69.6 million transactions and USD 8.9 million in December 2025, but Chainalysis attributes much of the fourth-quarter 2025 surge to PING, a pay-to-mint memecoin in which users paid 1 USDC in response to an HTTP 402 challenge to mint tokens, driving transactions up more than 10,000% in a single week. The peak likely reflected speculative repetition more than autonomous economic activity.

The technical floor, however, is real. FedNow's minimum fee of USD 0.045 per transaction makes sub-cent payments structurally impossible. This is territory only onchain rails can serve. But at USD 643,000 a month, it should be treated as a proof of concept rather than a market. Of August's 15.3 million agent transactions, 14.7 million — 96% — ran on x402, and concentration among users and recipients persists.

Round-the-clock settlement goes largely unused in business payments

In business-to-business flows, only about 5% of value was settled on weekends. Transaction counts tell a different story at 21%, and consumer and agent flows run at 25% to 29%, underscoring the contrast. The blockchain may run continuously, but corporate approval queues and off-ramps do not. The median business payment was around USD 500, and even August's largest single onchain payment of USD 8 million fell within the caps of the instant payment networks.

Dune identifies cross-border settlement and unbanked access as the remaining advantages. Domestic instant payment schemes face interoperability limits at borders, while stablecoins move value across them on a single network. But being able to send is not the same as being able to receive, and wallet identification, know-your-customer and anti-money-laundering compliance, and conversion into local currency all remain unresolved.

[Business Development Insights]

1. Investment in onchain payments should be assessed as connection to a distribution channel, not replacement of a rail. The winning card format rides on existing card networks and leaves merchant fee structures intact. Revenue comes from interchange participation and from foreign-exchange and treasury cost reduction, not from destroying payment fees. A business plan that misreads this has the wrong premise underneath its revenue model.
2. Separate count metrics from value metrics in KPI design. The 15.3 million transactions and the USD 643,000 are two faces of one phenomenon, and reading only the count means investing in a market that does not exist. Because the series is contaminated by speculative repetition such as PING, extrapolating from peak values should be prohibited by operating rule in favour of cleaned time series.
3. In Japan, the priority is not domestic payments but the cross-border receiving layer and card connectivity. With the Zengin System operating continuously and now open to funds transfer service providers, there is little room to compete on domestic speed or cost. By contrast, the design work that links yen stablecoin acceptance to overseas off-ramps with compliance built in remains unbuilt, and few operators can enter it. That is where the real contest sits.

[Sources]

CoinPost, "Onchain payments: cards and AI agents are the winning paths, per Dune analysis" (September 9, 2026) https://coinpost.jp/?p=736486 Dune, "Digital Asset Brief" (subscriber newsletter) https://dune.com/brief Blockchain.News, "Onchain Payments vs. Instant Rails: Access Sets Crypto Apart" (September 11, 2026) https://blockchain.news/news/onchain-payments-vs-instant-rails-access Dune Docs, Payments dataset collection overview https://docs.dune.com/data-catalog/curated/payments/overview Dune, "Dune Digest 041" (January 2026) https://dune.com/blog/dune-digest-041 Chainalysis, "Inside x402: 100M Agentic Payments on Base" https://www.chainalysis.com/blog/x402-agentic-payments-adoption/ CryptoPotato, "x402 Volume Plunges 93% YTD as Agentic AI Economy Hype Fades" https://cryptopotato.com/x402-volume-plunges-93-ytd-as-agentic-ai-economy-hype-fades/ Forbes, "Stablecoins Are Becoming Payment Rails—The Race To Connect Them Is On" (coverage of the Dune/Visa report, March 2026) https://www.forbes.com/sites/boazsobrado/2026/03/27/stablecoins-are-becoming-payment-rails-the-race-to-connect-them-is-on/ Japanese Banks' Payment Clearing Network, "About the Zengin System" https://www.zengin-net.jp/zengin_system/ Japanese Bankers Association, "The Domestic Exchange System" https://www.zenginkyo.or.jp/fileadmin/res/abstract/stats/viewpoint/viewpoint_07.pdf x402 whitepaper https://x402.org/wp-content/uploads/sites/10/2026/06/x402-whitepaper.pdf