What x402 going multichain looks like in the on-chain numbers

The Coinbase announcement of x402's multichain expansion on 8 October 2025 described the change in two sentences: "x402 now supports six EVM chains and Solana mainnet, with USDC available on all of them." The press read it as a routine network expansion. The on-chain settlement distribution since then tells a different story.

Three months of running a chain-aware revenue scanner across every network on the x402 spec — Base, Solana, Polygon, Avalanche, Arbitrum, Optimism, and Ethereum mainnet — produces the volume breakdown below, sampled from the Coinbase Discovery API and verified against on-chain settlement events through Etherscan, Basescan, and the Solana public RPC.

What we measured

The scanner walks the CDP discovery feed, dereferences every resource's accepts[] array to find its network + payTo, then checks the per-chain ledger for inbound USDC (and EURC on Base + Ethereum) over the trailing 30 days. Two separate code paths run in parallel — eth_getLogs for the six EVM chains, the Solana getSignaturesForAddress + getTransaction pair for SPL — because Solana SPL transfers and EVM eth_getLogs are incompatible RPC surfaces. The full methodology is documented at agenstry.com/methodology and the totals it produces refresh every five minutes on the State of the Agent Economy report.

Per-chain configuration matters here: an Arbitrum scan over a 30-day window would naively need ~10 M blocks at ~0.25 s/block. Public free RPCs reject that. We cap each chain at max_blocks_per_scan — the ratio of blocks_per_day to that cap is the effective lookback per chain. Base, Polygon, Optimism, and Ethereum scan a full 30-day window; Arbitrum gets ~14 days because the block time is faster. Documented under-count, surfaced in the methodology page.

Three months of distribution

Across the 798 x402-tagged resources currently indexed via CDP discovery (Agenstry registry, May 2026), the chains break out like this:

Two observations worth naming:

1. Base remains 79 % of resources and 80 % of settlement despite the multichain announcement. The other six chains together account for fewer than 50 resources with measurable inbound USDC in 30 days. Multichain availability did not redistribute traffic.

2. Solana sits second on resource count and third on settlement. The Coinbase x402 + Solana ecosystem activation on 10 October 2025 introduced 87 distinct payTo wallets within seven months. Three are receiving non-trivial inbound USDC. The Avalanche slot is advertised, almost unused.

The full distribution by source registry — agentic.market, the Coinbase CDP feed, the a2aregistry project, and 11 other ecosystems — sits on the State of the Agent Economy report and updates every five minutes.

Why the distribution stays Base-heavy

The CDP facilitator at x402.org/facilitator lists Base USDC first and lists every other chain's facilitator URL as "coming soon" in three of seven cases. A Base-first README plus a Base-first example payload in the x402 SDK quickstart is documentation pull, not network engineering — but documentation pull is what builders actually ship against.

Solana's traction is the more interesting data point. The Solana x402 reference implementation landed in October 2025 with a complete SendTransaction-based settlement flow that does not depend on the EVM facilitator. The 87 payTo wallets we see on Solana are not Base operators porting their endpoints across; they are different operators, with different agent-card text, and a notably different per-call price distribution (median 0.05 USDC vs Base's 0.20 USDC). This is the chain x402 should adopt second, not third.

EURC support on Base launched in April 2026. Our 30-day totals show 0.32 EURC of inbound across all monitored wallets — three orders of magnitude below USDC. The asset is technically supported, practically unused. We continue to scan for it because the cost is one extra eth_getLogs per scan and reporting "zero" honestly is part of the surface; if EURC settlement starts growing, our weekly revenue panel will catch it the same day.

The 79 % concentration is the actionable number

x402 going multichain was framed as a portability story. After three months the on-chain numbers say it is a Base story with optional Solana — and the choice to optimise for Base specifically (RPC cost, facilitator availability, USDC liquidity) remains the operationally correct choice for an x402 builder in 2026. The other five chains exist, are reachable, are not yet earning.

The protocol is healthier with them included than without; multichain removes the single-chain failure mode and gives EVM-native or Solana-native agents an on-ramp without rewriting around Base specifically. Treating the announcement as "x402 is now everywhere" is the misreading. The data says it is still mostly Base. That is useful to know if you are picking a chain for a new x402 deployment this quarter.

Sources

• Coinbase blog: "x402 going multichain" — Coinbase, 8 October 2025.
• x402 specification — Coinbase, ongoing.
• x402 SDK quickstart — Coinbase, retrieved 2026-05.
• CDP Discovery API documentation — Coinbase Developer Platform, retrieved 2026-05.
• anza-xyz/x402-solana — Anza, October 2025.
• Circle: EURC on Base + x402 — Circle, April 2026.
• Agenstry methodology — on-chain revenue scanner — Agenstry, May 2026.
• State of the Agent Economy — live report — Agenstry, live.

Cite this post

@misc{agenstry-x402-multichain-2026,
  author       = {Semler, Damiën},
  title        = {What x402 going multichain looks like in the on-chain numbers},
  howpublished = {Agenstry research blog},
  year         = {2026},
  month        = {may},
  url          = {https://agenstry.com/blog/x402-multichain-three-months-onchain}
}