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Instantly

Instantly is a cold email outbound platform that combines mailbox sending infrastructure, email warmup, a B2B lead database, deliverability tools, and a unified inbox for replies. The Instantly v2 REST API at api.instantly.ai/api/v2 covers campaigns, leads, accounts, email verification, inbox placement tests, webhooks, analytics, API keys, and workspaces, with Bearer token authentication and scoped API keys.

9 APIs 0 Features
Cold EmailOutboundSalesDeliverabilityLead DatabaseEmail VerificationWebhooks

Instantly publishes 9 APIs on the APIs.io network, including Campaigns API, Leads API, Accounts API, and 6 more. Tagged areas include Cold Email, Outbound, Sales, Deliverability, and Lead Database.

Instantly’s developer surface includes documentation, API reference, getting-started guide, authentication, pricing, engineering blog, signup flow, and 10 more developer resources.

APIs

Instantly Campaigns API

REST endpoints to create, list, fetch, update, launch, pause, and schedule cold email campaigns, plus manage sequences, A/B variants, and sender mailbox assignments.

Instantly Leads API

Endpoints to create, list, fetch, update, and delete leads, manage lead lists, move leads between campaigns, and update lead interest status.

Instantly Accounts API

Endpoints to add, list, update, and remove sender email accounts (SMTP, Gmail, Microsoft), configure per-account sending limits, and toggle warmup state.

Instantly Email Verification API

Single and bulk email address verification endpoints that check syntax, MX records, deliverability, and risk scoring before sending.

Instantly Inbox Placement Test API

Endpoints to run and read inbox placement tests across major mailbox providers, used to measure deliverability and quantify spam-folder risk before launching campaigns.

Instantly Webhooks API

CRUD endpoints for webhook subscriptions on campaign, lead, and account events (sent, opened, replied, bounced, unsubscribed) for streaming activity to external systems.

Instantly Analytics API

Campaign and account-level analytics — sent, open, click, reply, bounce, unsubscribe, and interested-lead counts aggregated over time ranges.

Instantly API Keys API

Endpoints to create, list, scope, and revoke API keys — the v2 API uses scoped Bearer tokens that can be restricted to specific resource permissions.

Instantly Workspaces API

Endpoints for managing workspaces — the multi-tenant boundary used by agencies and large teams to isolate campaigns, accounts, and billing.

Resources

🔗
Website
Website
🔗
App
App
🔗
Documentation
Documentation
🔗
APIReference
APIReference
🚀
GettingStarted
GettingStarted
🔑
Authentication
Authentication
🔗
OpenAPI
OpenAPI
💰
Pricing
Pricing
📰
Blog
Blog
🔗
Help
Help
📝
SignUp
SignUp
📝
SignIn
SignIn
📜
PrivacyPolicy
PrivacyPolicy
📜
TermsOfService
TermsOfService
🔗
LinkedIn
LinkedIn
🔗
Twitter
Twitter
👥
YouTube
YouTube

Sources

Raw ↑ 
aid: instantly-ai
url: https://raw.githubusercontent.com/api-evangelist/instantly-ai/refs/heads/main/apis.yml
name: Instantly
kind: company
description: >-
  Instantly is a cold email outbound platform that combines mailbox sending
  infrastructure, email warmup, a B2B lead database, deliverability tools, and
  a unified inbox for replies. The Instantly v2 REST API at
  api.instantly.ai/api/v2 covers campaigns, leads, accounts, email
  verification, inbox placement tests, webhooks, analytics, API keys, and
  workspaces, with Bearer token authentication and scoped API keys.
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
tags:
  - Cold Email
  - Outbound
  - Sales
  - Deliverability
  - Lead Database
  - Email Verification
  - Webhooks
created: '2026-05-23'
modified: '2026-05-23'
specificationVersion: '0.19'
apis:
  - aid: instantly-ai:campaigns-api
    name: Instantly Campaigns API
    description: >-
      REST endpoints to create, list, fetch, update, launch, pause, and
      schedule cold email campaigns, plus manage sequences, A/B variants, and
      sender mailbox assignments.
    humanURL: https://developer.instantly.ai/api-reference/groups/campaign
    baseURL: https://api.instantly.ai/api/v2/campaigns
    tags:
      - Campaigns
      - Sequences
    properties:
      - type: Documentation
        url: https://developer.instantly.ai/api-reference/groups/campaign
      - type: OpenAPI
        url: https://api.instantly.ai/openapi/api_v2.json
  - aid: instantly-ai:leads-api
    name: Instantly Leads API
    description: >-
      Endpoints to create, list, fetch, update, and delete leads, manage lead
      lists, move leads between campaigns, and update lead interest status.
    humanURL: https://developer.instantly.ai/api-reference/groups/lead
    baseURL: https://api.instantly.ai/api/v2/leads
    tags:
      - Leads
      - Contacts
      - Lists
    properties:
      - type: Documentation
        url: https://developer.instantly.ai/api-reference/groups/lead
      - type: OpenAPI
        url: https://api.instantly.ai/openapi/api_v2.json
  - aid: instantly-ai:accounts-api
    name: Instantly Accounts API
    description: >-
      Endpoints to add, list, update, and remove sender email accounts (SMTP,
      Gmail, Microsoft), configure per-account sending limits, and toggle
      warmup state.
    humanURL: https://developer.instantly.ai/api-reference/groups/account
    baseURL: https://api.instantly.ai/api/v2/accounts
    tags:
      - Email Accounts
      - Mailboxes
      - Warmup
    properties:
      - type: Documentation
        url: https://developer.instantly.ai/api-reference/groups/account
      - type: OpenAPI
        url: https://api.instantly.ai/openapi/api_v2.json
  - aid: instantly-ai:email-verification-api
    name: Instantly Email Verification API
    description: >-
      Single and bulk email address verification endpoints that check syntax,
      MX records, deliverability, and risk scoring before sending.
    humanURL: https://developer.instantly.ai/api-reference/groups/email-verification
    baseURL: https://api.instantly.ai/api/v2/email-verification
    tags:
      - Verification
      - Deliverability
      - Email
    properties:
      - type: Documentation
        url: https://developer.instantly.ai/api-reference/groups/email-verification
      - type: OpenAPI
        url: https://api.instantly.ai/openapi/api_v2.json
  - aid: instantly-ai:inbox-placement-api
    name: Instantly Inbox Placement Test API
    description: >-
      Endpoints to run and read inbox placement tests across major mailbox
      providers, used to measure deliverability and quantify spam-folder risk
      before launching campaigns.
    humanURL: https://developer.instantly.ai/api-reference/groups/inbox-placement-test
    baseURL: https://api.instantly.ai/api/v2/inbox-placement-tests
    tags:
      - Inbox Placement
      - Deliverability
      - Testing
    properties:
      - type: Documentation
        url: https://developer.instantly.ai/api-reference/groups/inbox-placement-test
      - type: OpenAPI
        url: https://api.instantly.ai/openapi/api_v2.json
  - aid: instantly-ai:webhooks-api
    name: Instantly Webhooks API
    description: >-
      CRUD endpoints for webhook subscriptions on campaign, lead, and account
      events (sent, opened, replied, bounced, unsubscribed) for streaming
      activity to external systems.
    humanURL: https://developer.instantly.ai/api-reference/groups/webhook
    baseURL: https://api.instantly.ai/api/v2/webhooks
    tags:
      - Webhooks
      - Events
      - Subscriptions
    properties:
      - type: Documentation
        url: https://developer.instantly.ai/api-reference/groups/webhook
      - type: OpenAPI
        url: https://api.instantly.ai/openapi/api_v2.json
  - aid: instantly-ai:analytics-api
    name: Instantly Analytics API
    description: >-
      Campaign and account-level analytics — sent, open, click, reply, bounce,
      unsubscribe, and interested-lead counts aggregated over time ranges.
    humanURL: https://developer.instantly.ai/api-reference/groups/analytics
    baseURL: https://api.instantly.ai/api/v2
    tags:
      - Analytics
      - Reporting
      - Metrics
    properties:
      - type: Documentation
        url: https://developer.instantly.ai/api-reference/groups/analytics
      - type: OpenAPI
        url: https://api.instantly.ai/openapi/api_v2.json
  - aid: instantly-ai:api-keys-api
    name: Instantly API Keys API
    description: >-
      Endpoints to create, list, scope, and revoke API keys — the v2 API uses
      scoped Bearer tokens that can be restricted to specific resource
      permissions.
    humanURL: https://developer.instantly.ai/api-reference/groups/api-key
    baseURL: https://api.instantly.ai/api/v2/api-keys
    tags:
      - API Keys
      - Auth
      - Scopes
    properties:
      - type: Documentation
        url: https://developer.instantly.ai/api-reference/groups/api-key
      - type: OpenAPI
        url: https://api.instantly.ai/openapi/api_v2.json
  - aid: instantly-ai:workspaces-api
    name: Instantly Workspaces API
    description: >-
      Endpoints for managing workspaces — the multi-tenant boundary used by
      agencies and large teams to isolate campaigns, accounts, and billing.
    humanURL: https://developer.instantly.ai/api-reference/groups/workspace
    baseURL: https://api.instantly.ai/api/v2/workspaces
    tags:
      - Workspaces
      - Multi-Tenant
      - Agency
    properties:
      - type: Documentation
        url: https://developer.instantly.ai/api-reference/groups/workspace
      - type: OpenAPI
        url: https://api.instantly.ai/openapi/api_v2.json
common:
  - type: Website
    url: https://instantly.ai
  - type: App
    url: https://app.instantly.ai
  - type: Documentation
    url: https://developer.instantly.ai
  - type: APIReference
    url: https://developer.instantly.ai/api-reference
  - type: GettingStarted
    url: https://developer.instantly.ai/getting-started/getting-started
  - type: Authentication
    url: https://developer.instantly.ai/getting-started/authorization
  - type: OpenAPI
    url: https://api.instantly.ai/openapi/api_v2.json
  - type: Pricing
    url: https://instantly.ai/pricing
  - type: Blog
    url: https://instantly.ai/blog
  - type: Help
    url: https://help.instantly.ai
  - type: SignUp
    url: https://app.instantly.ai/auth/signup
  - type: SignIn
    url: https://app.instantly.ai/auth/login
  - type: PrivacyPolicy
    url: https://instantly.ai/privacy-policy
  - type: TermsOfService
    url: https://instantly.ai/terms
  - type: LinkedIn
    url: https://www.linkedin.com/company/instantlyai
  - type: Twitter
    url: https://x.com/Instantlydotai
  - type: YouTube
    url: https://www.youtube.com/@instantly-ai
integrations:
  - name: Clay
  - name: HubSpot
  - name: Salesforce
  - name: Pipedrive
  - name: Zapier
  - name: Make
  - name: n8n
  - name: Slack
maintainers:
  - FN: Kin Lane
    email: [email protected]