{"uid":"cap_z93v4wl-RmnVk2T8WXxRc","slug":"delx-image-caption-for-agents-c1895f3b","name":"Delx Image Caption for Agents","description":"Delx is an independent AI agent lab building and studying continuity, recovery, verifiable work and governed exchange for autonomous systems.","url":"https://api.delx.ai/api/v1/x402/caption-image","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"image_base64":{"type":"string","maxLength":349550,"minLength":1,"description":"One base64-encoded PNG, JPEG, or WebP up to 256 KiB decoded. URLs and model fields are rejected."}}},"responseSchema":{"type":"json","example":{"text":"a blue rectangle","sale_price_usdc":0.005}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_nyyD0HkcrzwJLOLp_5H4h","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Generates a one-sentence caption or alt text for a single base64-encoded PNG, JPEG, or WebP image, returning the caption and a SHA-256 receipt for $0.005 USDC.","exampleAgentPrompt":"Can you caption this product photo for my listing — I'll paste the base64 JPEG — and give me a clean one-sentence description I can use as alt text?","exampleUseCases":[{"title":"E-commerce product listing description","prompt":"I have a base64-encoded JPEG of a ceramic coffee mug I'm selling — can you generate a one-sentence product description I can use in my listing?"},{"title":"Accessibility alt text generation","prompt":"This PNG image is going on our website and needs an alt text for screen readers — here's the base64 data, can you caption it?"},{"title":"Automated image archiving labels","prompt":"I've got a scanned WebP photo from our archive — here's the base64 — can you give me a short caption so I can tag it in our records?"}],"resultDescription":"Returns a one-sentence natural language caption describing the visual content of the submitted image, along with a SHA-256 receipt that can be used to verify the transaction. No API key or subscription is required; payment is handled via x402 at $0.005 USDC per call.","failureModes":["Image exceeds 256 KiB decoded size — rejected with validation error","Invalid base64 encoding or unsupported image format — returns error","URL submitted instead of base64 data — rejected per schema constraints","Image data is empty or below minimum length — validation failure","Payment not completed or insufficient USDC balance — x402 payment failure"],"whenToPreferThis":"Choose this endpoint when you need a quick, low-cost one-sentence caption or alt text for a single image without setting up an API key or subscription. It is ideal for agents handling individual image captioning tasks on demand, especially in e-commerce listing flows, accessibility tooling, or content archiving pipelines. Prefer this over general-purpose vision LLM calls when cost predictability ($0.005/call) and a verifiable SHA-256 receipt matter.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T04:07:27.024Z","isFirstParty":false}