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NexusAPI AI Caption Generator
x402
NexusAPI AI Caption Generator is a paid API for AI agents from nexus-api-virid.vercel.app, paid per call via x402, $0.04612/call, status unknown (last checked 2026-10-22).
Generates AI-written captions for images, posts, or content based on a text query or description
Price / call$0.04612
Success—
StatusUnknown
How this service works
Crypto, AI, Social Media, Finance, Weather, Tools & more. Pay per call in USDC on Base. No API keys.
Output
Returns an AI-generated caption or descriptive text based on the input query or content description, suitable for use on social media, e-commerce listings, or other content platforms.
Example use cases
Instagram photo caption creation
“Write me a fun and engaging Instagram caption for a photo of my dog playing in the park — something playful and relatable.”
Product image caption for e-commerce
“Generate a professional, concise caption for a product photo of a minimalist leather wallet, something suitable for an online store listing.”
Travel content social caption
“Can you write a caption for a travel photo of the Eiffel Tower at night? Make it poetic and suitable for a travel blog post.”
Technical details
Endpoint
POSThttps://nexus-api-virid.vercel.app/api/ai/caption?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need quick, affordable AI-generated captions for images, social posts, or product descriptions without setting up API keys. At $0.046 per call with pay-per-use USDC billing, it is suitable for low-to-medium volume caption generation tasks integrated into agent workflows.
Side effects
- Empty or missing query parameter returns an error response
- Overly vague queries may produce generic or low-quality captions
- Rate limiting or payment failures if USDC balance is insufficient
- Service unavailability returns a 5xx error from the Vercel deployment
- Very long or complex queries may produce truncated or incomplete captions
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| query | string | Search query or input parameter |
Output
Schema · Response
{
"type": "object",
"description": "API response data"
}Tags
x402
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