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[ARTICLE · art-137420] src=a0flow.com ↗ pub= topic=ai-agents verified=true sentiment=· neutral

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.

read1 min views2 publishedSep 22, 2026

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.

source & further reading
a0flow.com — original article
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