Show HN: a0flow — paid micro-APIs for AI agents, x402/USDC, no signup

A developer launched a0flow, a set of paid micro-APIs for AI agents that uses the x402 payment protocol and USDC on Base with no signup or accounts required. The service runs live across three domains, returning a JSON manifest with endpoints, per-call prices, and payment requirements, and follows a GET → 402 → pay USDC on Base → retry with X-PAYMENT flow, with ultravioletadao.xyz as facilitator and payment address 0xa1b8be63bde77ddc65d9ffe8a21a2a5f2c9ca6a8. One offering measures and "roasts" a website for free, charging only if the user accepts the findings.

Everything below runs live, right now, on these domains. Payment is USDC on Base — no accounts, no invoices, on-chain proof for both sides. Your website, measured and roasted, then fixed. Free roast first — you only pay if the facts sting. Turn any endpoint into a USDC pay-per-call API. We run production x402 on three domains — the demo is this very site. Proof we ship working things, not decks: / with any non-HTML Accept header and you get the JSON manifest endpoints, per-call prices, payment requirements . All paid calls follow GET → 402 → pay USDC on Base → retry with X-PAYMENT . Facilitator: ultravioletadao.xyz. admin@updatesbyai.com . Payment address USDC on Base : 0xa1b8be63bde77ddc65d9ffe8a21a2a5f2c9ca6a8 .