AlphaDrip

AlphaDrip is an x402-monetized trading signal API where every call is a real on-chain USDC settlement on Arc Testnet. No subscriptions, no middlemen, no batching abstractions — just direct per-call payment at $0.003 USDC, settled in sub-second time via EIP-3009 transferWithAuthorization on Arc's USDC contract. The cascade engine connects to Hyperliquid's public WebSocket trade feed, evaluates BTC trade volume against a rolling baseline, and fires liquidation cascade signals when volume spikes >2.5× with directional bias >70%. Each signal is exposed via a paywalled HTTP endpoint that returns 402 Payment Required, advertising Arc Testnet USDC as the accepted asset. Consumers sign an EIP-3009 authorization off-chain (no Gateway deposit required), the producer relays it on-chain as a real USDC transfer, the signal payload is returned with the Arc transaction hash. Every paid call is independently verifiable on the Arc Block Explorer. A recorded 326-second demo session produced 163 paid on-chain settlements, 263 cascade signals fired, $0.483 USDC settled by the consumer, $0.489 USDC earned by the producer (the difference being the producer's gas reimbursement of ~$0.0019 per tx). Net producer margin after gas: 36% — economically viable per-call pricing that's impossible on any other L1. The original architecture targeted Circle Gateway's batched-x402 facilitator. We discovered that endpoint returns "unsupported_network" for Arc Testnet (eip155:5042002) — a real bug we documented and submitted as Circle product feedback. Per the Arc team's explicit Discord guidance ("you can build x402-style logic on Arc, you'll need to implement the logic yourself"), we pivoted to direct EIP-3009 settlement, which works perfectly because Arc's USDC at 0x3600... is a fully EIP-3009-compliant Circle FiatTokenV2. Live demo: https://alphadrip.baserep.xyz Source: https://github.com/Makabeez/alphadrip