{"uid":"cap_zdFKWb_bawcakGISP6Omj","slug":"delx-commerce-image-captioning-api-22b6f812","name":"Delx Commerce Image Captioning API","description":"Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.","url":"https://commerce.delx.ai/api/v1/x402/caption-image?utm_source=zero.xyz","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_N-xWT4UOfLDxT9fNzF_J0","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 plain-text caption describing the visual content of a base64-encoded image, paid per-result via USDC","exampleAgentPrompt":"Can you caption this image for me? Here it is as a base64-encoded JPEG — just tell me what's in it.","exampleUseCases":[{"title":"Auto alt-text for product images","prompt":"I have a base64-encoded PNG of one of our product shots — can you generate a caption describing what's in it so I can use it as alt text on the website?"},{"title":"Screenshot content extraction","prompt":"Here's a base64-encoded screenshot from our app — describe what's visible in it so I can log it in our bug report."},{"title":"Image inventory labeling","prompt":"I've got a base64-encoded JPEG of an item in our warehouse — what does the image show? I need a short description to tag it in our inventory system."}],"resultDescription":"A JSON object containing a 'text' field with a natural language caption describing the image contents, and a 'sale_price_usdc' field confirming the per-call charge (e.g. 0.005 USDC).","failureModes":["Image exceeds 256 KiB decoded size — request rejected","Invalid base64 encoding — returns error","Unsupported image format (not PNG, JPEG, or WebP) — request rejected","URL passed instead of base64 data — explicitly rejected by schema","Model field included — rejected","Payment not provided or insufficient USDC — 402 Payment Required response","Network timeout if image is at size limit"],"whenToPreferThis":"Choose this endpoint when you need a quick, low-cost, no-signup image captioning call paid per result with on-chain verifiability via USDC. Ideal for AI agents operating autonomously without pre-negotiated API keys, or when you need pay-as-you-go billing with cryptographic payment proof. Best suited for single-image captioning of PNG, JPEG, or WebP files under 256 KiB.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T02:48:14.687Z","isFirstParty":false,"canonicalSlug":"delx-commerce-image-captioning-api-22b6f812"}