The strongest available figures demonstrate individual supplier activity, not total US market volume. These disclosures are not additive: suppliers can participate in the same underlying call, and the reporting periods and units differ.
| Source and date | Disclosed activity | What it does—and does not—establish |
|---|---|---|
| Vapi, 12 May 2026 | More than 1 billion calls handled, cumulatively; 1 million developers had built on the platform | Platform activity, not a count of paying businesses, annual US calls or independently verified resolutions. (vapi.ai) |
| ElevenLabs, 30 September 2026, updated 5 October 2026 | ElevenAgents handling more than 15 million conversations weekly, up 3× since February; ElevenAgents ARR increased more than 3× over the same interval | Company-reported growth. The disclosure does not provide a US-only, telephone-only volume breakdown or the agent product’s absolute ARR. (elevenlabs.io) |
| ElevenLabs, 4 February 2026, reporting year-end 2025 | Company-wide ARR above $330m | A corporate scale indicator spanning the company’s products—not US telephone-agent revenue. (elevenlabs.io) |
| PolyAI, 15 December 2025 | 100+ enterprise customers and 2,000+ live deployments across 25+ countries | A dated enterprise footprint; deployments are not equivalent to distinct customers or resolved calls. (poly.ai) |
| ServiceTitan / Bill Joplin’s HVAC, 9 June 2026 | 1,300+ calls in just over three months; more than 90% resulted in booked jobs; 72% completed without human intervention | One supplier-published customer case. Booking and autonomous completion are explicitly different measures. (servicetitan.com) |
| Arini / Unified Dental Care, undated case observed 23 October 2026 | 250,000+ calls, 18,000+ appointments and $1m+ production over a stated 12-month period, across 12 practices | The case identifies an October 2024 launch but does not specify the exact measurement cut-off. Production from booked appointments is not supplier revenue or proof of incremental profit. (arini.ai) |
| Assort Health, executive interview published 24 June 2026 | Proprietary dataset described as drawing on 190 million patient interactions | A data-resource claim, not evidence of 190 million autonomous patient calls completed in production. (fiercehealthcare.com) |
What should buyers learn from the home-services case?
The ServiceTitan case also reports customer estimates of more than $74,000 in incremental booked revenue and approximately $23,000 in reduced operating costs, associated with fewer missed calls and avoided seasonal hiring. Those are customer estimates published by the supplier; the article does not provide a controlled attribution analysis or a complete deployment cost ledger. (servicetitan.com)
Recommended interpretation: use the case to design a test, not to forecast the same return. Ask for eligibility rules, booking cancellations, completed jobs, repeat callers, human involvement and the counterfactual callback process.
What volumes remain unknown?
This review did not establish reliable public totals for:
- Annual US business calls handled by generative voice agents.
- Paying US businesses using agents in production.
- The share of deployments completing tasks without human intervention.
- Sector-wide correct-booking, repeat-contact or failed-transfer rates.
- A representative distribution of monthly spend or implementation fees.
Consequently, supplier volume milestones should not be converted into market share estimates.