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What each call costs

A1, A2, A3 and X all count as a priority. A number that comes back unable_to_check is never charged.

Your balance

A new account starts with 500 free credits, once. If you subscribe, the ones you have not used stay in your balance beside your plan credits. Standard is $500 a month for 5,000 credits. A top-up is 1,000 credits for $100, on a paid plan, and is used after your plan credits.

How a charge works

1

The balance is checked first

If it cannot cover the whole call, you get a 402 insufficient_credits and nothing is spent.
2

The call runs

A find looks for a mobile. A check reads the number’s signals.
3

You are charged for what came back

The response says exactly what it cost in credit_cost.
Retrying? Send the same Idempotency-Key and you are charged once however many times the request arrives.