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Fretchen AI Image Generation & NFT Minting Service
x402
Fretchen AI Image Generation & NFT Minting Service is a paid API for AI agents from imagegen-agent.fretchen.eu, paid per call via x402, $0.07/call, status unknown (last checked 2026-09-15).
Generates AI images from text prompts (or edits existing images) and mints them as NFTs on Optimism/Base, paid via x402 USDC.
Price / call$0.07
Success—
StatusUnknown
How this service works
AI-powered image generation with NFT minting on Optimism/Base, paid via x402 USDC.
Output
Returns a JSON object containing a URL to the generated image, a URL to the NFT metadata JSON, and the on-chain transaction hash confirming the mint on Optimism/Base.
Example use cases
Mint original AI artwork as NFT
“Generate an AI image of 'a serene Japanese garden at sunset with cherry blossoms reflecting in a koi pond' at 512x512 and mint it as NFT token ID 7.”
Edit existing NFT with new AI image
“I have NFT token ID 15 — can you update it with an edited version that adds dramatic storm clouds to the background? Here's the reference image in base64.”
Automated AI art NFT collection drop
“Create a new AI-generated image of 'a glowing geometric dragon on a dark void background' in 1024x1024 and publish it as NFT token ID 101 on-chain.”
Technical details
Endpoint
POSThttps://imagegen-agent.fretchen.eu/When to prefer
Choose this endpoint when you need to both generate an AI image AND mint it as an NFT on Optimism or Base in a single call, especially in Web3 or blockchain-native agent workflows where payment via x402 USDC is already supported. It is uniquely suited for scenarios requiring on-chain provenance of AI-generated art, NFT collection management, or automated minting pipelines. If you only need image generation without NFT minting, a standard image generation API would be simpler and cheaper.
Side effects
- Invalid or missing prompt — returns error indicating prompt is required
- Missing tokenId — returns validation error as tokenId is required
- Insufficient USDC payment via x402 — payment not accepted, request rejected
- Edit mode requested without referenceImage — returns error that base64 reference image is required
- Invalid base64 referenceImage — image decoding failure
- Unsupported size parameter — may return error or default to a supported dimension
- On-chain transaction failure — mint may fail due to network congestion or contract error, no transaction_hash returned
- Rate limiting or service unavailability — HTTP 429 or 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| mode | string | generate: create new image, edit: modify existing image |
| size | string | Output image dimensions |
| promptrequired | string | The text prompt for AI image generation |
| tokenIdrequired | integer | The NFT token ID to update |
| referenceImage | string | Base64-encoded reference image (required for edit mode) |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| image_url | string | URL to the generated image |
| metadata_url | string | URL to the NFT metadata JSON |
| transaction_hash | string | Mint transaction hash on-chain |
Tags
x402
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