# Acutis QR
Buying guide: https://acutisignatius.com/agentic/qr/
Output schema: /openapi.json → paths → /v1/qr/render → post → responses → 200. Actual fixed response: /v1/example.
Generate SVG or PNG QR codes for links, text and standard payloads. Includes a four-module quiet zone, selectable error correction and validated foreground/background contrast.
POST /v1/qr/render: {"text":"https://acutisignatius.com/agentic","format":"png","size":512}
Price: 0.02 USDC (20000 atomic) on Base mainnet eip155:8453. x402 v2 PAYMENT-REQUIRED / PAYMENT-SIGNATURE / PAYMENT-RESPONSE. Validate and prepare work before payment. Result released after settlement.
JSON file artifacts contain filename, MIME type, size_bytes, sha256 and base64. Decode base64 to save file bytes. Diagnostic APIs return structured JSON directly.
Exact proof + normalized input delivers the cached result for 30 minutes across restarts. A proof cannot buy another input. Do not create a new authorization after ambiguous delivery. Receipt cache stores the returned result for retry delivery; central analytics omits inputs, caller identities and proofs.
Empty unsigned POSTs inspect payment and Bazaar metadata without performing work. Signed empty requests return 422 before verification or settlement.
Free: GET /v1/example (fixed, no customization), /docs, /openapi.json, /service.json, /health. Production has no free custom-work bypass. One-megabyte JSON request limit. Bounded instance concurrency; 429 Retry-After when busy.
Bazaar discovery metadata is declared; external directory listing is not guaranteed.