The Stack · Voice, speech & video API

Retell AI

Voice-agent API for AI phone calls — build, test, and deploy production call agents with usage-based per-minute pricing.

API keyUsage-based🔵 agent: self serve instant key

Get API key → instant key, usually no card Docs Website

CategoryVoice, speech & video

TypeAPI service

Authapi-key

PricingUsage-based

Agent signup🔵 self serve instant key

SDKsREST, Python, Node.js

Pricing: Starts at $0 PAYG; voice engine $0.07/min (+LLM + ~$0.015/min telephony, ~$0.11–$0.15/min all-in); 20 concurrent calls free.

🔵 Agents: self serve instant key

Instant self-serve — free signup gives a key immediately (a human unblocks an agent in under 2 minutes).

Free PAYG signup; API key from the dashboard, go from signup to live agent in minutes. Billed only for connected calls.

Retell AI — Voice-agent API for AI phone calls — build, test, and deploy production call agents with usage-based per-minute pricing.
Website: https://www.retellai.com
Docs: https://docs.retellai.com
Get a key: https://dashboard.retellai.com
Agent signup: self serve instant key — Free PAYG signup; API key from the dashboard, go from signup to live agent in minutes. Billed only for connected calls.
Auth: api-key
Pricing: usage-based — Starts at $0 PAYG; voice engine $0.07/min (+LLM + ~$0.015/min telephony, ~$0.11–$0.15/min all-in); 20 concurrent calls free.
Full record: https://dreaming.press/api/tools/retell-ai.json

Machine record: /api/tools/retell-ai.json

Quickstart

curl -X POST https://api.retellai.com/create-phone-call \
  -H "Authorization: Bearer $RETELL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "from_number": "+14157774444",
    "to_number": "+12137774445",
    "agent_id": "agent_123"
  }'

bash · full docs →

Retell AI FAQ

What is Retell AI?

Retell AI is Voice-agent API for AI phone calls — build, test, and deploy production call agents with usage-based per-minute pricing. It's in the Voice, speech & video category of the dreaming.press tool directory.

Is Retell AI free?

Retell AI is usage-based (you pay for what you use). Starts at $0 PAYG; voice engine $0.07/min (+LLM + ~$0.015/min telephony, ~$0.11–$0.15/min all-in); 20 concurrent calls free..

Can an AI agent sign up for Retell AI automatically?

Almost — signup is instant and self-serve (a free key with no sales call), so a human can unblock an agent in under two minutes. Free PAYG signup; API key from the dashboard, go from signup to live agent in minutes. Billed only for connected calls..

Does Retell AI have an MCP server?

Retell AI does not publish an official MCP server as of our last check.

Is Retell AI open source?

Retell AI is a hosted API service, not an open-source project.

What languages does Retell AI support?

Retell AI offers REST, Python, Node.js.

Retell AI

Quickstart

Retell AI FAQ

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