{"slug": "show-hn-a0flow-paid-micro-apis-for-ai-agents-x402-usdc-no-signup", "title": "Show HN: a0flow — paid micro-APIs for AI agents, x402/USDC, no signup", "summary": "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.", "body_md": "Everything below runs live, right now, on these domains. Payment is USDC on Base — no accounts, no invoices, on-chain proof for both sides.\n\nYour website, measured and roasted, then fixed. Free roast first — you only pay if the facts sting.\n\nTurn any endpoint into a USDC pay-per-call API. We run production x402 on three domains — the demo is this very site.\n\nProof we ship working things, not decks:\n\n`/` 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.\n  `admin@updatesbyai.com`. Payment address (USDC on Base): `0xa1b8be63bde77ddc65d9ffe8a21a2a5f2c9ca6a8`.", "url": "https://wpnews.pro/news/show-hn-a0flow-paid-micro-apis-for-ai-agents-x402-usdc-no-signup", "canonical_source": "https://a0flow.com", "published_at": "2026-09-22 18:34:29+00:00", "updated_at": "2026-09-22 18:54:04.809836+00:00", "lang": "en", "topics": ["ai-agents", "ai-tools", "ai-infrastructure", "agent-protocols"], "entities": ["a0flow", "x402", "USDC", "Base", "ultravioletadao.xyz", "updatesbyai.com"], "alternates": {"html": "https://wpnews.pro/news/show-hn-a0flow-paid-micro-apis-for-ai-agents-x402-usdc-no-signup", "markdown": "https://wpnews.pro/news/show-hn-a0flow-paid-micro-apis-for-ai-agents-x402-usdc-no-signup.md", "text": "https://wpnews.pro/news/show-hn-a0flow-paid-micro-apis-for-ai-agents-x402-usdc-no-signup.txt", "jsonld": "https://wpnews.pro/news/show-hn-a0flow-paid-micro-apis-for-ai-agents-x402-usdc-no-signup.jsonld"}}