Two rails. x402 pay-per-call — including the flagship address-reputation verdict — settles in USDC on Base mainnet (eip155:8453), no testnet setup needed (quickstart). The on-chain subscribe flow and the EIP-712 attestation domain on this page run on Arbitrum Sepolia (chainId 421614) — audit-gated, mainnet anchor pending.
Feeds
First-party data feeds and oracles — pay-per-call in USDC on Base mainnet; on-chain subscribe on Arbitrum Sepolia.
Counts are live on-chain protocol totals. All current publishers and subscribers are first-party (protocol self-tests) — no external-usage claim.