LexicostCosts, terms and calculators
Each page explains one thing and, where there is something to work out, has the calculator on the same page. The calculators use rates each vendor publishes, and show where every rate comes from.
With a calculator
Billed minutes: how vendors round a callPuts seven vendors' own rules for rounding, minimums, attempt fees, silence and voicemail side by side, including where a vendor's pages disagree or say nothing, and its calculator works out how many minutes the same calls are billed at every vendor whose per-minute rates it holds.Concurrency limits for AI voice agentsPuts what vendors' own pages say about included calls at once, the price of one more and what happens to a call over the limit side by side, and works out how many calls at once a given busy hour needs.Cost per call: AI agent or a personWorks out an AI call's cost from a vendor's own published rate and a person's from Bureau of Labor Statistics wage and benefit figures, finds the finish rate at which the AI stops saving money, and puts side by side how vendors bill a call after the AI hands it to a person.AI voice agent cost per minuteAdds up the five parts of a minute from each vendor's own published rates, with a box for any part a vendor does not price, and shows which parts each vendor's headline price leaves out.OpenAI Realtime API cost per minuteWorks out what OpenAI's per-token audio prices come to for a whole call and per minute, which OpenAI does not publish, and shows why a long call costs more per minute than a short one.
Explained
Containment rate and resolution rateDefines containment, transfer, resolution, deflection and repeat-contact rates with their formulas, runs one set of 100 example calls through all of them, and puts five voice agent platforms' own wording side by side on who decides that a call succeeded.Endpointing, turn detection and barge-inLines up what Retell, Vapi, Bland, ElevenLabs and Synthflow call the settings that decide when their agent starts and stops talking, with the defaults the vendors state and the places where a vendor's own pages disagree.HIPAA and BAAs for AI voice agentsPuts seven AI voice vendors' own words side by side on whether they sign a BAA, on which plan and, where published, at what price, and quotes each on at least one part of a call, such as the AI model or phone line, that can come from another company.TCPA rules for AI voice callsStates what the FCC's own documents say about AI voices and consent, with document numbers and dates, and separates the rules in force from those only proposed or not yet effective.