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.

Syncing…

Live catalog from the x402 gateway. Subscriber / message counts are live on-chain protocol totals — first-party self-tests, no external-usage claim.