{"id":"42167e25-b376-4ba7-834b-1895cecd75f2","shortId":"84BYjy","kind":"mpp","title":"Nano Banana Pro image generation via micropayments — up to 4K, ~10s, $0.13–$0.24 per image","tagline":"Nano Banana Pro image generation via micropayments — up to 4K, ~10s, $0.13–$0.24 per image","description":"This endpoint generates images using the Nano Banana Pro model through StableStudio's pay-per-generation API. It accepts a text prompt and optional aspect ratio (10 options from 1:1 to 21:9) and resolution (1K, 2K, or 4K), returning a job ID that can be polled for the completed image URL. Pricing is $0.13–$0.24 per generation depending on resolution, with results typically delivered in ~10 seconds.\n\nStableStudio is a broader platform offering multiple AI image and video models (GPT Image 1.5, Flux 2 Pro, Grok, Seedance, Wan 2.6, Sora 2, Veo 3.1) all accessible through the same payment flow. This specific endpoint covers Nano Banana Pro's generate operation. Payment is settled in USDC on Base (EIP-155:8453) via x402 or MPP (Tempo method). No API keys are required — authentication and payment happen through on-chain USDC authorization headers.\n\nThe workflow is: POST to the endpoint without payment to receive a 402 challenge with the exact USDC amount, sign the payment, re-POST with the PAYMENT-SIGNATURE header to get a pending job, then poll GET /api/jobs/{jobId} with a SIGN-IN-WITH-X wallet signature header until the job completes and returns an imageUrl. An edit endpoint at the same model path also supports image-to-image editing with up to 14 reference images. The full OpenAPI spec is available at /api/openapi.json and an MCP server is available via `npx -y agentcash@latest`.","tags":["image","video","generation","nano-banana","gpt-image","grok","flux","sora","veo","seedance","wan"],"capabilities":["text-to-image","image-generation","up-to-4k-resolution","aspect-ratio-control","usdc-payment","x402-protocol","mpp-tempo-protocol","async-job-polling","no-api-key","wallet-auth"],"categories":["vision","image-generation"],"synonyms":["nano banana","nano-banana-pro","AI image generator","text to image","stablestudio image","micropayment image generation","USDC image API","pay-per-image","crypto image generation"],"warnings":["Probe used HEAD/GET which returned 405; this is a POST-only endpoint so liveness is not confirmed by probe but is expected to work based on OpenAPI spec","No dedicated documentation page at /docs (returns 404); all docs are embedded in the OpenAPI x-guidance field","The listing URL path is /nano-banana/generate but the OpenAPI spec documents /nano-banana-pro/generate — verify the correct model slug"],"endpointUrl":"https://stablestudio.dev/api/generate/nano-banana/generate","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"stablestudio.dev","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.880","qualityRationale":"Full OpenAPI 3.1 schema with detailed input/output definitions, comprehensive guidance docs, clear pricing, and live 402 challenge flow documented. The probe returned 405 on HEAD/GET (expected since this is a POST-only endpoint), so the endpoint is not confirmed broken. Deducting slightly because the probe didn't capture an actual 402 on POST, and no dedicated docs page exists (404 on 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'/api/jobs':215 '/api/openapi.json':263 '0.13':12,27,87 '0.24':13,28,88 '1':61,62 '1.5':115 '10':58,99 '10s':11,26 '14':253 '1k':68 '2':117,124 '2.6':122 '21':64 '2k':69 '3.1':126 '402':188 '4k':10,25,71 '8453':153 '9':65 'AI image generator' 'USDC image API' 'accept':50 'access':128 'agentcash':273 'ai':108 'also':243 'amount':194 'api':48,161 'aspect':56 'aspect-ratio-control' 'async-job-polling' 'authent':165 'author':174 'avail':261,269 'banana':2,17,38,139 'base':150 'broader':104 'chain':172 'challeng':189 'complet':82,230 'cover':137 'crypto image generation' 'deliv':97 'depend':91 'edit':236,249 'eip':151 'endpoint':32,136,182,237 'exact':192 'flow':133 'flux':116 'full':257 'generat':5,20,33,47,90,142 'get':208,214 'gpt':113 'grok':119 'happen':168 'header':175,206,226 'id':75 'imag':4,15,19,30,34,83,109,114,246,248,255 'image-generation' 'image-to-imag':245 'imageurl':234 'job':74,211,229 'jobid':216 'key':162 'latest':274 'mcp':266 'method':159 'micropay':7,22 'micropayment image generation' 'model':40,112,241 'mpp':157 'mpp-tempo-protocol' 'multipl':107 'nano':1,16,37,138 'nano banana' 'nano-banana-pro' 'no-api-key' 'npx':271 'offer':106 'on-chain':170 'openapi':258 'oper':143 'option':55,59 'path':242 'pay':45 'pay-per-gener':44 'pay-per-image' 'payment':132,144,167,184,197,204 'payment-signatur':203 'pend':210 'per':14,29,46,89 'platform':105 'poll':79,213 'post':179,200 'price':85 'pro':3,18,39,118,140 'prompt':53 'ratio':57 're':199 're-post':198 'receiv':186 'refer':254 'requir':164 'resolut':67,93 'result':95 'return':72,232 'second':100 'seedanc':120 'server':267 'settl':146 'sign':195,220 'sign-in-with-x':219 'signatur':205,225 'sora':123 'spec':259 'specif':135 'stablestudio':42,101 'stablestudio image' 'support':244 'tempo':158 'text':52 'text to image' 'text-to-image' 'typic':96 'up-to-4k-resolution' 'url':84 'usdc':148,173,193 'usdc-payment' 'use':35 'veo':125 'via':6,21,154,270 'video':111 'wallet':224 'wallet-auth' 'wan':121 'without':183 'workflow':177 'x':223 'x402':155 'x402-protocol' 'y':272","prices":[{"id":"743b2fd8-2d58-4cb8-b525-86d9070ed033","listingId":"42167e25-b376-4ba7-834b-1895cecd75f2","amountUsd":"0.039","unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":"39000","chain":"tempo","payTo":null,"paymentMethod":"mpp-tempo","isPrimary":true,"details":{"realm":"stablestudio.dev","intent":"charge","method":"tempo","dynamic":false,"decimals":6,"unit_type":null,"amount_hint":null,"raw_payment":{"amount":"39000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Nano Banana image generation"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T20:00:04.047Z"}],"sources":[{"listingId":"42167e25-b376-4ba7-834b-1895cecd75f2","source":"mpp_dev","sourceId":"stablestudio:POST:/api/generate/nano-banana/generate","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T20:00:04.047Z","lastSeenAt":"2026-04-22T07:15:16.900Z"}],"details":{"listingId":"42167e25-b376-4ba7-834b-1895cecd75f2","quickStartSnippet":"# 1. Get payment challenge\ncurl -X POST https://stablestudio.dev/api/generate/nano-banana-pro/generate \\\n  -H 'Content-Type: application/json' \\\n  -d '{\"prompt\": \"A cat astronaut floating in space\"}'\n# Returns 402 with PAYMENT-REQUIRED header (base64 JSON)\n# 2. Decode challenge, sign USDC authorization, re-POST with PAYMENT-SIGNATURE header\n# 3. Poll GET /api/jobs/{jobId} with SIGN-IN-WITH-X header until complete","exampleRequest":{"prompt":"A cat astronaut floating in space, photorealistic","imageSize":"2K","aspectRatio":"16:9"},"exampleResponse":{"type":"nano-banana-pro-generate","jobId":"abc123-def456","status":"pending","success":true},"schema":{"path":"/api/generate/nano-banana/generate","method":"POST","payment":{"amount":"39000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"description":"Nano Banana image generation"},"description":"Nano Banana image generation"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Nano Banana Pro generate costs $0.13–$0.24 per generation and takes ~10s","source_url":"https://stablestudio.dev/api/openapi.json"},{"claim":"Payment is USDC on Base (eip155:8453) with amount in 6-decimal micro-units (134000 = $0.134)","source_url":"https://stablestudio.dev/api/openapi.json"},{"claim":"Supports aspect ratios 1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9, 21:9 and resolutions 1K, 2K, 4K","source_url":"https://stablestudio.dev/api/openapi.json"},{"claim":"MCP server available via npx -y agentcash@latest","source_url":"https://stablestudio.dev/agents.txt"},{"claim":"Payment system is USDC on Base with no API keys required","source_url":"https://stablestudio.dev/agents.txt"}],"useCases":["Generate high-resolution images from text prompts with per-call micropayments","Programmatic image creation for apps/agents without subscription commitments","Produce images up to 4K resolution in various aspect ratios for marketing or content","Agent-driven image generation using on-chain USDC payments"],"bestFor":["Agents or apps needing on-demand image generation without API key management","Pay-per-use image generation with no subscription","High-resolution (up to 4K) text-to-image with flexible aspect ratios","Crypto-native workflows settling in USDC on Base"],"notFor":["Users without an EVM wallet or USDC on Base","Bulk batch image generation requiring sub-second latency","Image editing workflows (use the /edit endpoint instead)"],"kindDetails":{"docs":{"llmsTxt":"https://stablestudio.dev/llms.txt","homepage":"https://stablestudio.dev"},"tags":["image","video","generation","nano-banana","gpt-image","grok","flux","sora","veo","seedance","wan"],"realm":"stablestudio.dev","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://stablestudio.dev","name":"Merit Systems"},"categories":["ai","media"],"service_id":"stablestudio","integration":"first-party","service_name":"StableStudio","service_description":"Pay-per-generation AI image and video creation — Nano Banana, GPT Image, Grok, Flux, Sora, Veo, Seedance, and Wan."},"updatedAt":"2026-04-22T07:15:16.900Z"}}