Web calculations and API access are available. View Billing for payment and automatic top-up availability.

Web and API pricing

Free calculations on the web. Cost-per-mile API usage uses a monthly free allowance before prepaid USD balance.

Free web

Guest or unverified email: 10 calculations per tool, 30 total per UTC day.

Signed in with a verified email: 20 per tool, 60 total per UTC day.

With one tool, the effective daily limit is 10 or 20 calculations. Signing in does not reset usage.

Registration is free, with no card required. API balance does not increase web quotas.

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API pricing

Register, verify your email and create an API key to use the API. Manage balance purchases and optional automatic top-up in Billing when available.

$0.005 per new successful cost-per-mile API operation.

$1.50 per organization per calendar month UTC after email verification — enough for 300 operations at this price. This is the full monthly allowance, not your remaining balance.

Free allowance is used first, then prepaid funds. It resets each UTC month and does not carry over. Creating another API key does not create another allowance.

Errors and eligible replays with the same idempotency key within 24 hours do not create another charge.

Read API docs

Estimate API usage cost

Assumes one verified organization, a full monthly free allowance, and no other API usage. Errors and eligible replays are excluded.

JavaScript is needed to use the estimate. Prices and links remain available.

This estimate uses the price snapshot shown above. Reload pricing to check current terms. Actual charges use the price at the time of the API operation. This is not a payment quote.

Prepaid balance

Top-ups: $10.00–$500.00 per purchase when available in Billing. A $10 payment adds $10 to API balance for manual and automatic top-ups. Any applicable tax is included; processing fees are our expense. Contact support with payment questions. Purchased funds do not expire. No overdraft.

Optional auto-recharge

OFF by default. The default threshold is $2.00 across available free + paid funds, with a $20.00 top-up. Enabling it below the threshold requires confirmation of a possible immediate purchase.

The monthly free allowance of $1.50 is below the default $2.00 threshold.

Spending limits

Default paid-spend limits: $10.00 per UTC day and $100.00 per UTC month. Only paid API consumption counts; free usage and top-ups do not.

Questions about pricing?

Unused prepaid funds are not ordinarily refundable. For incorrect or duplicate payments and required exceptions, contact support@doft.com.

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