| RANK | PAYER | SAMPLED TXS | EST DAY COUNT |
|---|
Fingerprint: AuthorizationUsed events on Base USDC 0x8335…2913 (EIP-3009). This fires for every gasless USDC authorization spend — including non-x402 uses.
Two calibers shown side by side: ALL EIP-3009 (exact event count) and FACILITATOR-CONFIRMED — settlements whose submitting address is in the x402scan facilitator registry (51 Base addresses; Coinbase ×40, FluxA, Ultravioleta DAO, Primer, Polymer, Meridian; snapshot Sep 27 2026).
Excluded from x402 volume: Circle-Gateway-type infrastructure deposits (they also use ERC-3009 for gasless USDC onboarding). Out-of-scope: Hyperliquid and other venues — this radar indexes Base mainnet only.
Counts and payer addresses are exact (full event replay, 2.6M+ events, no gaps, deduplicated by block range). Amounts and payee identities come from a stratified sample: 1,200 txs/day, decoded from tx input or receipt logs; daily volume = sampled sum × (day events / sampled events), single-ticket decode errors >$1M dropped (35 records).
Addresses we could not verify are marked unidentified — never guessed. Path badges: registered = submitting facilitator in registry; gateway = Circle Gateway-type infra; unregistered = active settlement path outside the registry.
Before Sep 8: farming/airdrop campaign inflated raw counts to 1M+/day (visible in x402scan aggregates). Sep 23 spike: burst-settlement farm pattern (see Note.01). Facilitator-confirmed share is the steadier signal on both.
All figures recompute from public Base RPC endpoints. Rebuilt hourly from the chain; og card regenerates with each build.