# PayWeave Replicate – FLUX 2 Klein 4B Image Generation

> PayWeave Replicate – FLUX 2 Klein 4B Image Generation is a paid API for AI agents from replicate.payweave.services, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Runs Black Forest Labs' FLUX 2 Klein 4B model via Replicate to generate images from a prompt, billed per-call via x402 micropayment.

## Facts

- Endpoint: POST https://replicate.payweave.services/models/black-forest-labs/flux-2-klein-4b/predictions
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/payweave-replicate-flux-2-klein-4b-image-generation-9ff3b31a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JPu3fBVBrujwERQWRSaVq

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability payweave-replicate-flux-2-klein-4b-image-generation-9ff3b31a -d '<json body>'
```

Example prompt: Use the FLUX 2 Klein 4B model on Replicate to generate an image of a misty Japanese forest at dawn with soft golden light filtering through the trees.

## When to prefer this

Choose this endpoint when you need to generate images using the open-source FLUX 2 Klein 4B model specifically, want pay-per-call micropayment billing via x402 with no subscription required, and are comfortable with Replicate-hosted CDN output URLs with a 24-hour TTL.

## Known failure modes

- Model inference fails — status='failed', error field contains reason
- Payment not accepted or x402 auth rejected — HTTP 402 before inference begins
- Invalid or missing input object — HTTP 400 or error in response body
- Model is starting or processing and output is not yet ready — status='starting' or 'processing'
- CDN URL expires after ~24 hours — image no longer accessible

## How this service works

Run open-source AI models — image, video, audio.

## Output

Returns a Replicate prediction object containing a status (succeeded/failed/canceled/processing/starting), a CDN-hosted image URL valid for ~24 hours, the prediction ID, timing metrics (total_time, predict_time), and the USD amount charged for the call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "id",
  "model",
  "status",
  "error",
  "predicted_price_usd"
 ],
 "properties": {
  "id": {
   "type": "string",
   "description": "Replicate prediction ID."
  },
  "error": {
   "type": [
    "string",
    "null"
   ]
  },
  "model": {
   "type": "string"
  },
  "output": {
   "description": "Model-specific output. Image/audio models return CDN URLs (Replicate-hosted, ~24h TTL); vision-LLM models return a string; music models return a single audio URL or array."
  },
  "status": {
   "enum": [
    "succeeded",
    "failed",
    "canceled",
    "processing",
    "starting"
   ],
   "type": "string"
  },
  "metrics": {
   "type": "object",
   "properties": {
    "total_time": {
     "type": "number"
    },
    "predict_time": {
     "type": "number"
    }
   },
   "additionalProperties": false
  },
  "created_at": {
   "type": "string"
  },
  "completed_at": {
   "type": "string"
  },
  "predicted_price_usd": {
   "type": "string",
   "description": "USD charged for this call."
  }
 },
 "description": "Replicate prediction result with metadata.",
 "additionalProperties": false
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/payweave-replicate-flux-2-klein-4b-image-generation-9ff3b31a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from replicate.payweave.services](https://www.zero.xyz/host/replicate.payweave.services/llms.txt)