Software that pays for what it uses, without asking a human first, has moved from demo talk to measurable traffic. Chainalysis counted 138.5 million payments through x402, a protocol Coinbase built for AI agents, in an October 14 report. That total stood at just 58,800 as of the third quarter of 2025. A Motley Fool analysis published October 24 calls that jump the market's next growth driver, naming Solana — near $101 — as best placed to ride it. Solana does not lead the count. Base, the Ethereum layer-2 Coinbase built, leads cumulative settled x402 transactions and payment volume, but has no token of its own. That gap leaves Solana — second on both measures, ahead of Base on single-day activity more than once in 2026 — as the proxy. SOL changed hands at $101.10, down 2.57%, at 3:28 p.m. ET on October 24, per the Fool's market data — a soft tape: MarketRadar's Saturday snapshot showed Bitcoin at $80,466, down 0.95%, and Ethereum at $2,338, down 2.42%.
Why would a machine need its own payment rail? The sums are too small for card networks. Chainalysis found more than 87% of analysed x402 payments fell between $0.0001 and $0.10 — a range where a card fee alone would swallow the purchase. An agent buying one API call or code check signs a cryptographic payment authorisation instead, and the money moves in stablecoins.
How we got here
x402 started life in May 2025, when Coinbase turned a dormant piece of web plumbing — the HTTP "402 Payment Required" status code — into a working mechanism: a server answers a request with a price, the buyer resubmits with signed authorisation, and a facilitator checks it and covers the fee. In July 2025 the protocol's foundation moved under the Linux Foundation with 40 members, including Visa and Stripe. Chainalysis's October 14 study of North American crypto then supplied the first hard count: Base x402 transactions rose from roughly 1,500 in mid-2025 to over 138 million by Q3 2026, while the median gap between a wallet's first funding and first payment collapsed from 73 days down to 18 minutes and the 30-day refill share climbed from 70.6% to 89.3%.
Geography split sharply. Wallets linked to the United States made up 88.1% of locatable inference payments, against 0.1% for China-linked wallets. Chainalysis research head Eric Jardine told CoinDesk that Chinese developers lean toward open-weight models like DeepSeek and Qwen. Chinese-linked wallets showed a different pattern, taking roughly nine in ten located payments for security and code checks, much of it to auditor AgentLisa.
Speed is the product.
Why it matters
Solana's case rests on speed and price, not the headline count. The Fool points to sub-cent fees and to Alpenglow, activated October 21, targeting finality of 150 milliseconds — down from 12.8 seconds under TowerBFT. For agents making thousands of tiny purchases, a slow rail means batching and waiting. Builders are squeezing the plumbing further: Solana now lets agents bundle payments through PayAI Network and BlockRunAI, and BlockRunAI says batching trims its monthly fee bill by over $20,000 while cutting latency to a tenth. September set a new Solana stablecoin high at $17.3 billion, while daily stablecoin addresses numbered 888,000, a 269% annual rise — the fuel agents spend. That fuel matters because x402 settles in stablecoins, not SOL: Solana is the road, not the cargo. Cloudflare strategy chief Stephanie Cohen told CoinDesk that stablecoins are "particularly well suited" for this first wave of agent spending; BlackRock's Will Su told Chainalysis the firm is tracking agentic commerce closely, pointing to appetite for "frequent, low-value" agent payments.
x402 by the numbers
| Measure | Figure | Source |
|---|---|---|
| Cumulative x402 payments on Base | 138.5 million (Q3 2025: 58,800) | Chainalysis, Oct 14 |
| Growth multiple | ~2,355x | MarketRadar calculation |
| Payments worth $0.0001–$0.10 | Over 87% | Chainalysis |
| July 2026: payments / value | ~75 million / ~$24 million | Chainalysis via CoinDesk |
| Implied average July payment | ~$0.32 | MarketRadar calculation |
| Settlements since March 2025 (Base, Solana, Polygon) | 198.9 million / $52.7 million | TRM Labs |
| TRM's "plausible" value after filtering | ~$25.6 million (48.6%) | TRM Labs via Motley Fool |
The count is real. The revenue is not yet proven.
Traffic is not demand.
For traders, the distinction is everything: traffic can be faked or looped, while revenue cannot be.
Chainalysis counts traffic; TRM Labs questions how much of it is commerce. A separate TRM cut reported by Decrypt put the genuinely agentic share of remaining payment value at just 0.6% to 7.5% — scripts and self-dealing can produce identical records. Until a quarterly dollar value replaces the July snapshot, x402 has proven machines will pay — not that anyone profits.
Solana levels to watch
| Level | Value |
|---|---|
| SOL, Oct 24 | $101.10 (-2.57%, Fool, 3:28 p.m. ET) / $101.32 (EconoTimes, 11:40 UTC) |
| Oct 24 session range | $101.73 – $105.24 |
| Averages overhead | SMA 7 $104.50, SMA 20 $107.99, SMA 50 $109.69 |
| Distance to SMA 20 / SMA 200 ($88.32) | +6.8% / -12.6% (MarketRadar calculation) |
| All-time high (Jan 2025) | $293 — SOL sits ~65% below it |
No prediction here — the table just frames the tape: SOL spent October 24 beneath every short- and medium-term average, well above its 200-day line.
Spot Solana ETFs add a second headwind: $6.7 million of outflows on October 19 extended the withdrawal streak to 11 sessions (EconoTimes), against $1.542 billion of inflows since launch.
What to watch
First, whether Solana keeps daily-activity leadership from Base, or Base reasserts its cumulative lead. Second, whether the money catches up with the count — watch for a quarterly dollar value for x402 activity and repeat spending that survives TRM's filters. Third, the calendar: the Federal Reserve meets October 27–28, and a risk-off tape like October 23–24's would swamp any chain-specific story, with Solana ETF flows the tell.
MarketRadar take
Treat this as an infrastructure story with a revenue question attached, not the other way round. Solana has the two things agent payments need — sub-cent fees and, since Alpenglow, near-instant finality — plus record stablecoin supply. What it lacks is proof that the 138.5 million count converts into durable fee income, and TRM's filters warn against reading traffic as demand. For now the levels above, not the transaction count, are the honest scoreboard: reclaiming the $104.50–$107.99 band would show buyers returning; sliding toward $88.32 would say the market still prices this as an experiment.
