AI Diagnostics API for Rapid Differential Analysis

Revolutionizing healthcare with technology. Breaking barriers ... to leave no one behind

DxGPT is the AI that refuses to ask permission to save time and lives

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1M+ users worldwide

More than 1M estimated users of DxGPT.app, across 1.7M sessions.

1.2M diagnoses

Differential diagnosis searches run on DxGPT.app.

4.42/5 · 88.4% positive

Based on 18.8K user votes on the suggested diagnoses.

Figures as of October 2026.

About us

Fundación 29 is a non-profit tech rebel on a mission to make rare-disease diagnosis accessible to everyone.

We harness breakthrough AI, break down bureaucratic walls and—if needed—ask for forgiveness rather than permission. Because nothing should stand between a patient and a timely answer.

DxGPT is our clinical-grade AI engine for rapid, structured differential diagnosis. GDPR & HIPAA ready, running on Microsoft Azure. Trusted by more than 1 million users with 4.42/5 satisfaction.

DxGPT cuts diagnostic time from hours to seconds — so clinicians focus on care, not paperwork.

What You Can Do with DxGPT

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Submit natural language symptom descriptions

✓

Attach medical reports, lab results and clinical images

✓

Receive structured diagnostic suggestions

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Refine each hypothesis with targeted follow-up questions

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Ask general medical questions and get answers with cited sources

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Integrate into EHR, apps or patient portals

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Access detailed disease info and clinical summaries

About DxGPT

Fundación 29 is a non-profit organization using AI to make rare disease diagnosis accessible to everyone. DxGPT is our clinical-grade AI engine for rapid, structured differential diagnosis. GDPR & HIPAA compliant. More than 1 million users worldwide.

✅ Submit clinical descriptions in natural language
✅ Attach documents (PDF, Word, text) and clinical images
✅ Receive structured diagnostic suggestions
✅ Integrate into EHR, apps or portals
✅ Access detailed info, follow-up questions and clinical summaries

Want to know more? Visit our About Us page or check our FAQ

If you need to contact us, you can do so easily using the contact form at the bottom of the About Us page.

How does it work?

DxGPT's medical API analyzes clinical descriptions and suggests possible differential diagnoses. Fast responses, multilingual, data protection and easy integration.

POST /api/diagnose
{
  "description": "13-month-old patient. First focal seizure at 3 months. Multiple tonic-clonic seizures. Febrile seizures. One status epilepticus at 8 months.",
  "myuuid":"550e8400-e29b-41d4-a716-446655440000",
  "timezone":"Europe/Madrid"
}

Available Plans

Freemium

Free

50 calls/day
2 RPS
Same model as Pro
Ideal for testing and evaluation

Pro

Pay as you go

200 RPM, 1,000 calls/day
One model for every request, with text, documents and images
Diagnosis, medical questions, follow-up questions and disease info
For professionals, integrators and clinical platforms
💰 Transparent usage-based billing
✅ Pay only real consumption — no fixed fee per call
✅ Daily cost calculation, monthly invoice
✅ Costs include tokens, translations, and processing

Need a higher daily quota? Contact us

Cost Reference

Billing is based on real consumption: AI tokens processed, translation services, and infrastructure. The two main cost drivers are input volume (tokens from the patient description, documents and images) and input language (non-English inputs require translation). Every request runs on the same model; there are no modes to choose from. Figures below are the typical amount billed for real requests in September 2026.

Operation	Endpoint	English input	Non-English input	Notes
Diagnosis ⭐	`/diagnose`	~$0.022–0.037	~$0.038–0.067	Ranked differential diagnosis from a text description.
Documents & images	`/medical/analyze`	Diagnosis cost + ~$0.0024 per image + ~$0.012 per document page		Reads reports and lab results (OCR) and clinical images, then runs the diagnosis. Images also add input tokens to the diagnosis.
Medical question	`/ask`	~$0.048–0.072		Educational answer with web search and cited sources.
Follow-up questions	`/questions/followup`, `/patient/update`	~$0.012–0.018 per call		Questions to refine the case or a single hypothesis, and the updated description.
Disease info	`/disease/info`	~$0.004		Details about one suggested diagnosis.

📏

Input volume is the primary cost driver. Every token sent to the API is billed — this includes the patient description, any uploaded documents (PDF, Word, EHR exports), and images. A short description (~200 tokens) costs significantly less than a detailed clinical history or attached report (~2,000–5,000 tokens). Estimates in the table above assume ~500 tokens.

⚠️

Non-English inputs incur additional translation costs (Azure AI Translator) applied before and after AI processing. For short descriptions, translation can represent a large share of the total cost — which is why the non-English column is significantly higher.

💡

One model for every request. The API no longer has standard / advanced / multimodal modes, and those names are no longer billed at their old prices. If your client still sends model (gpt54mini, o3, gpt5, gpt4o and the other previous values), the request is accepted and runs on the current model: you do not need to change the integration. Uploaded documents and images are stored only to complete the request and are deleted within 24 hours.