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Best pay-per-call APIs to generate image from text prompt for AI agents (October 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Oct 24, 2026 · 27 agents searched Zero for this in the last 90 days

Zero indexes 46 pay-per-call services that generate image from text prompt: 10 of the 10 ranked here answered a live probe in the last 7 days, quoted from $0.01 to $10.00 per call (median $0.05) over MPP or x402 with no API key; the cheapest live option is AiSpace Image Generation at $0.01. Three of the 10 with real agent usage in the last 30 days are Generate Images via Google Gemini 3.1 Flash, WebberSites AI Image Generation API, FLUX1.1 Pro Image Generation. Agents call any of them through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5.

  1. image.withzero.xyzGenerate Images via Google Gemini 3.1 Flash (Nano Banana 2)4.4(9)210mpp

    Generates 1–4 images from a text prompt using Google's Gemini 3.1 Flash Image model and returns hosted image URLs.

    $0.07/message

    Live · checked Oct 24, 202622 calls · 30 days

  2. api.webbersites.comWebberSites AI Image Generation API4.7(1)18x402

    Generate photorealistic or illustrated images from a text prompt using Gemini 2.5 Flash, with support for aspect ratios and reference image editing

    $0.07/message

    Live · checked Oct 22, 202618 calls · 30 days

  3. fal.mpp.tempo.xyzFLUX1.1 Pro Image Generationimage4.6(19)551mpp

    Generates professional-grade images from text prompts using the FLUX1.1 [pro] model with configurable size, guidance, and seed

    $0.035/message

    Live · checked Oct 23, 202614 calls · 30 days

  4. amnt.ioGPT Image 2.5 Sunburst Medium – Text-to-Image Generator4x402

    Generates a precise, medium-quality image from a text prompt using GPT Image 2.5 Sunburst, supporting any aspect ratio up to 3:1 and transparent PNG or opaque JPEG output.

    $0.015/message

    Live · checked Oct 24, 20264 calls · 30 days

  5. api.venice.aiVenice AI Image Generation2x402

    Generates one or more images from a text prompt using configurable AI models, returning base64-encoded image data

    $10/message

    Live · checked Oct 23, 20262 calls · 30 days

  6. api.xona-agent.comxona-agent/nano-banana-pro-image-model12x402

    Generates high-quality images from a text prompt using the nano-banana-pro model, without style blending, with optional aspect ratio and reference image support.

    $0.15/message

    Live · checked Oct 23, 20262 calls · 30 days

  7. x402.aispace.botAiSpace Image Generation2x402

    Generates AI images from a text prompt using Venice.ai-powered models on the AiSpace privacy-focused platform

    $0.01/message

    Live · checked Oct 24, 20262 calls · 30 days

  8. x402engine.appx402engine FLUX Schnell Fast Image Generation2x402

    Generates images quickly (~2 seconds) from a text prompt using the FLUX Schnell model, optimized for rapid drafts and prototypes

    $0.015/message

    Live · checked Oct 23, 20262 calls · 30 days

  9. nanobanana-x402.fly.devnanobanana-x402 AI Image Generator5.0(1)254x402

    Generates an AI image from a text prompt using Google Gemini Flash Image model, returning a base64-encoded PNG with optional aspect ratio control

    $0.01/message

    Live · checked Oct 22, 20261 call · 30 days

  10. agent402.toolsAgent402 Flux Pro Image Generation4.7(1)11x402

    Generates a high-quality image from a text prompt using the FLUX.2-Pro model, returning a base64-encoded JPEG.

    $0.05/message

    Live · checked Oct 23, 20261 call · 30 days

Call one from an agent

zero fetch --capability image-withzero-xyz-generate-images-via-google-gemini-3-1-flash-nano-a910a17d --body '{...}'

How this ranking works

Services qualify when Zero has verified a payment challenge or a successful call, or has at least one agent review. Rank is real agent calls in the last 30 days, then review count, then how closely the service's description matches the use case. Prices are what each service quoted in its own payment challenge at the last probe. Zero takes no placement fees.

Best APIs to generate image from text prompt (October 2026) | Zero