Custom Vision Prediction Client
Custom Vision Prediction Client
Custom Vision Prediction API runs inference using your trained Custom Vision model — upload an image, get classification labels and confidence scores.
Pairs with Custom Vision Training API — seamless training-to-inference
Only invokes your own trained models — not a general-purpose vision API
Train and publish a model in the Custom Vision portal to get endpoint + prediction key. POST /customvision/v3.0/Prediction/{projectId}/classify/iterations/{iterationName}/image with the image upload.
Uptime · 30-day window
About this API
Custom Vision is Azure's "no-ML-expertise-needed" tool for training custom image classification/object detection models: upload labeled images, click train in the UI, get a model in minutes — zero code. Prediction API is the inference endpoint — call the published endpoint with the prediction key, get confidence scores per class. Typical uses: QA inspection (train "pass/fail" classifier), UGC auto-tagging (train business-specific tags), branded-SKU detection. Complements the general-purpose Computer Vision API (out-of-the-box, no training).
What you can build
- 1Production inference on a trained image-classification model
- 2Object detection (e.g. defect detection on a production line)
- 3Auto-tag product images
Strengths & limitations
Strengths
- Pairs with Custom Vision Training API — seamless training-to-inference
- Low-latency single-image inference (~500ms typical)
- Supports model export to ONNX/TensorFlow Lite for offline inference
Limitations
- Only invokes your own trained models — not a general-purpose vision API
- Accuracy depends entirely on training-data quality
Example request
curl https://microsoft.com/<endpoint>Getting started
Train and publish a model in the Custom Vision portal to get endpoint + prediction key. POST /customvision/v3.0/Prediction/{projectId}/classify/iterations/{iterationName}/image with the image upload.
FAQ
Are Prediction and Training the same API?+
No. Training runs on *.cognitiveservices.azure.com; Prediction has a different endpoint (per-project prediction key).
Can models be exported for offline use?+
Yes — the Custom Vision portal supports export to ONNX / TensorFlow Lite / CoreML for edge inference.
Technical details
- Auth type
- unknown
- Pricing
- unknown
- Protocols
- REST
- SDKs
- python, javascript, csharp, java, go
- Response time
- 48 ms
- Last health check
- 5/12/2026, 7:37:52 AM
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