New: voice agent API + MCP·Place calls over REST or MCP →
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Give your software
a voice.

An AI voice agent that places and answers real phone calls -- over a REST API or MCP. It books meetings, qualifies leads, and follows your rules.

Prefer it done for you? Meet your AI receptionist →

call placed
place-a-call.sh
# Place an outbound call with one request
curl -X POST https://api.byourside.ai/v1/agent/calls \
  -H "Authorization: Bearer bys_ak_live_..." \
  -H "Content-Type: application/json" \
  -d '{
  "to": "+12025551234",
  "objective": "Book a 30-min demo"
}'
// response (200 OK)
{
  "callId": "f47ac10b-58cc-4372-a567-0e02b2c3d479",
  "status": "queued"
}

// poll GET /v1/agent/calls/{id} — when completed:
// { status, summary, extracted, transcript, durationSec }
REST APIMCPNode + Python SDKsWebhooks

Two lines to a live call

It is this simple.

REST API
curl -X POST \
  https://api.byourside.ai/v1/agent/calls \
  -H "Authorization: Bearer bys_ak_..." \
  -d '{
    "to": "+14155550123",
    "objective": "Qualify this lead"
  }'
MCP -- Claude + Cursor

Add the By Your Side MCP server to Claude or Cursor. Your AI agent can now place calls as a native tool call.

# local stdio MCP
npx byourside-mcp

Or use the hosted connector at mcp.byourside.ai/mcp -- nothing to install.

What you can build

Four ways to connect.

REST API

POST to /v1/agent/calls with a phone number and an objective. Get back a callId. Poll or receive webhooks.

Quickstart →

MCP server

Add the By Your Side MCP connector to Claude or Cursor. Your AI agent can place calls and check results as tool calls.

MCP guide →

Node + Python SDKs

npm install byourside or pip install byourside. Zero dependencies. Includes waitForCall polling helpers.

SDK docs →

Webhooks

Receive real-time call events: call.in_progress and call.completed with transcript, summary, and extracted fields.

Webhook docs →

See it live

Real demos, real calls.

These are live product demos. No simulations.

Try it: place a real call

Enter a phone number and an objective. Watch the call status and transcript stream in live.

Open playground →

Lead-caller demo

See the agent qualify a sales lead: it asks your questions, extracts answers, and returns structured data.

Open demo →

Build it yourself

Follow the quickstart: get an API key, POST a number + objective, poll GET for the transcript and extracted fields. From zero to a live call in minutes.

API quickstart →

Built for production

Safety rails built in.

Real guards that ship with every call. No configuration required.

Do-not-call list

Numbers flagged as DNC are blocked automatically before the call is placed.

Quiet hours

Calls are gated by time-of-day rules so you never ring someone at 2 AM.

Recording notice

The agent announces recording at the start of every call so you stay compliant.

Fraud auto-suspend

Spend anomalies and blocked destinations trigger automatic account suspension.

Safe destinations only

Premium-rate, satellite, and high-cost international numbers are blocked automatically.

Hard call-length cap

Every call has a maximum length, so a runaway call can never drain your balance.

No impersonation

The agent never claims to be a bank, the government, or a specific person, and never asks for passwords or one-time codes.

Your own caller ID

Pass callerId per call or set a default on your agent key. The recipient sees your number.

Pricing

Plans from $49 / month.

Every plan starts with a 14-day free trial. No credit card to start.

Developer API

Starter, Pro or Business

From $49/mo for 1 number and 250 AI minutes, up to $299/mo for 5 numbers and 2,500 minutes. Or pay as you go with $10 free credit to start. No minimum commitment.

See pricing →

For business

No code? No problem.

The AI receptionist for business owners who just want calls answered, meetings booked, and customers happy -- without writing a line of code.

Meet the receptionist →

Start building

Your software, on the phone.

Get an API key, place your first call in minutes. A 14-day free trial is included on every plan.

Start buildingRead the docs