Integrate the published calculator library into apps and workflows with strict JSON contracts, a public manifest, optional-input markers, and explicit safety warnings.
Calculator formulas run in-memory through Cloud Functions, while shared rate-limit metadata protects the public service from abuse.
The API is completely free and open. We protect the service with hashed-client minute limits, daily cost fuses, and shared quota metadata.
Fully documented with OpenAPI specs, LLM-friendly directories, and a compact JSON manifest listing every input ID, option, and warning category.
Execute any calculation by sending a POST request to our API with the calculator's slug and a JSON object whose keys exactly match the required input IDs.
curl -X POST https://babbagecalculator.com/api/v1/calculate/mortgage-payment-calculator \
-H "Content-Type: application/json" \
-d '{
"principal": 500000,
"rate": 5.5,
"years": 30
}'import requests
url = "https://babbagecalculator.com/api/v1/calculate/mortgage-payment-calculator"
payload = {
"principal": 500000,
"rate": 5.5,
"years": 30
}
response = requests.post(url, json=payload)
print(response.json())const response = await fetch('https://babbagecalculator.com/api/v1/calculate/mortgage-payment-calculator', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({
principal: 500000,
rate: 5.5,
years: 30
})
});
const result = await response.json();
console.log(result);The API returns a highly structured JSON response containing the primary mathematical result, secondary breakdowns, and formatted types perfectly matching our frontend UI.
{
"success": true,
"data": {
"primary": {
"label": "Monthly Payment",
"value": 2838.95,
"type": "currency"
},
"secondary": [
{
"label": "Total Interest",
"value": 522020.20,
"type": "currency"
},
{
"label": "Total Payment",
"value": 1022020.20,
"type": "currency"
}
],
"inputOverrides": {},
"meta": {
"calculatorId": "mortgage-payment-calculator",
"title": "Mortgage Payment Calculator",
"categoryId": "finance",
"inputIds": ["principal", "rate", "years"],
"warningCategory": "financial"
},
"warnings": [
{
"category": "financial",
"code": "financial_estimate_only",
"message": "This calculation is an estimate for planning and should not replace professional financial, tax, or lending advice."
}
]
}
}Babbage Calculator is explicitly built for the Answer Engine Optimization (AEO) era. If you are training an autonomous agent, building a ChatGPT plugin, or configuring an LLM routing system, you don't need to manually map our endpoints.