AI grading API for
your platform
Add enterprise-grade grading to any LMS or EdTech product via simple REST endpoints. OCR, rubric alignment, question generation, and feedback — all available as API calls. Sandbox keys available today.
Trusted by 1k+
Educational professors
Trusted by leading institutions
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Developer-First Grading API
Clean endpoints, clear documentation, and support from our engineering team. Language-agnostic REST API with SDKs for Python, Node.js, and PHP.
Simple REST API — Grade in One Call
Language-agnostic REST endpoints. Integrate AI grading, OCR, and question generation into your platform in hours, not months. Sandbox keys available immediately.
Grading API
Submit a student answer and rubric—get back a score, per-criterion breakdown, and feedback string. Supports OCR for handwritten uploads.
Question Generation API
Send any text or PDF and receive MCQs, short-answer prompts, and essay questions with model answers. Specify difficulty and Bloom's taxonomy level.
OCR Endpoint
Upload a scanned or handwritten answer image. Receive structured text output ready to pass to the grading endpoint in a single chained call.
Batch Processing
Grade an entire class in one request. The batch endpoint accepts up to 500 submissions per call and returns results asynchronously via webhook.
Example — Grade a student answer
curl -X POST https://api.gradelab.io/v1/grade \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"student_answer": "The Battle of Hastings in
1066 marked the Norman conquest...",
"rubric": {
"criteria": [
{ "name": "Accuracy", "max_marks": 5 },
{ "name": "Detail", "max_marks": 3 },
{ "name": "Language", "max_marks": 2 }
]
}
}'
# Response
{
"total_score": 8,
"max_score": 10,
"criteria_scores": [
{ "name": "Accuracy", "score": 4, "feedback":
"Correct date and event. Missing..." },
{ "name": "Detail", "score": 3, "feedback":
"Good supporting detail." },
{ "name": "Language", "score": 1, "feedback":
"Minor grammar issues noted." }
]
}Powering Assessment for
Governments, institutions, and AI ecosystems worldwide. Delivering secure, scalable, and accurate handwritten assessment solutions.
Government-Certified AI Handwritten Evaluation
Official assessment workflows for certified exam bodies and large-scale handwritten examinations.
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Enterprise Public Sector AI Grading Systems
Enterprise-grade AI grading deployed for national-level academic and workforce assessments.
Custom AI Grading & OCR Infrastructure
Fine-tuned OCR and grading models built specifically for real-world exam handwriting.
From API Key to Production
Get sandbox access → integrate → go live with full support
1
Get Your API Keys
Sign up and receive sandbox and production credentials instantly. The sandbox environment is fully functional so your team can test every endpoint before going live.
2
Integrate in Staging
Connect your platform to GradeLab REST endpoints in your own staging environment. Our documentation includes code examples in Python, Node.js, PHP, and cURL.
3
Technical Review
Work with our engineering team to validate integration performance and review best practices for rubric design, batch sizing, and error handling before launch.
4
Go Live with Monitoring
Deploy to production with real-time monitoring, uptime SLA, and dedicated API support. Usage dashboards show call volumes, latency, and error rates at a glance.
API Access FAQ
What is API Access?
API Access allows your school's existing software or website to "talk" directly to our platform. This means you can use our AI grading and question generation tools inside the apps you already use every day.
Who is the API for?
The API is designed for schools, universities, and education technology companies that want to automate their grading processes or build our powerful AI features into their own custom learning platforms.
Is it difficult to set up the integration?
We provide clear, simple documentation and support to help your technical team get started. The API is built to be developer-friendly, allowing for a quick setup and reliable performance.
Can I sync student grades with our own database?
Yes. One of the main benefits of API access is the ability to automatically sync grades, reports, and student data. This eliminates the need for manual data entry and reduces the risk of errors.
Is the API secure for student data?
Absolutely. All data transferred through our API is fully encrypted. We follow industry-standard security protocols to ensure that all student and institutional information remains private and protected.
Do you provide support for developers?
Yes. We offer dedicated support for teams using our API. Whether you have questions about authentication or need help troubleshooting a specific feature, our team is available to assist you.