Developer dashboard
API keys, quotas and usage. The API itself stays free and needs no key — a key raises your rate limit rather than granting access.
Preview: there is no login yet
Your account is whatever identifier you type below, and anyone who knows it can see and revoke your keys. Treat this as a private preview. When authentication lands it replaces the field below and one function on the server; keys, quotas and usage do not change.
Using a key
Send it as a bearer token. Requests without one still work at the anonymous limit.
curl -s https://www.usmortgagecalc.com/api/v1/calculate-mortgage \
-H 'authorization: Bearer usmc_live_…' \
-H 'content-type: application/json' \
-d '{"homePrice":400000,"downPaymentPercent":20,
"annualInterestRatePercent":6.5,"loanTermYears":30,"state":"Texas"}'