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 publishes a 173-operation OpenAPI 3.1 covering campaigns and subsequences, leads and lead lists, sending accounts and warmup, email verification, inbox placement tests, SuperSearch enrichment, blocklists, custom tags, audit logs, background jobs, webhooks, analytics, API keys, workspaces and workspace groups. Authentication is a scoped Bearer API key backed by a full OAuth 2.0 authorization server with 178 published scopes, PKCE and dynamic client registration. Instantly also runs a hosted remote MCP server, publishes an A2A agent card, an llms.txt and first-party Agent Skills.

Instantly publishes 2 APIs on the APIs.io network: API v2 and Campaigns API. Tagged areas include Cold Email, Outbound, Sales, Deliverability, and Lead Database.

The Instantly catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Instantly’s developer surface includes authentication, documentation, API reference, getting-started guide, pricing, engineering blog, signup flow, and 41 more developer resources.

🌐 Visit website 📡 Source on GitHub

67.1/100 exemplar ▬ flat Agent 61/100 agent ready Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0

AccessPaidSelf serve

2 APIs 1 MCP Servers

Cold Email Outbound Sales DeliverabilityLead DatabaseEmail Verification Webhook

Kin Score

Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0

Composite quality — 67.1/100 · exemplar

Contract Quality 17.3 / 25

Developer Ergonomics 15.7 / 20

Access Clarity 16.8 / 20

Operational Transparency 6.5 / 13

Contract Governance 2.0 / 12

Discoverability 8.7 / 10

Agent readiness — 61/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/instantly-ai: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Instantly MCP Server

MCP SERVER

GraphQL 1

GraphQL schemas published by this provider.

Rate Limits 1

Documented rate limits and quota policies.

Instantly Ai Rate Limits

7 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Scopes 1

OAuth scopes governing access to this provider's APIs.

Instantly Ai Scopes

178 scopes · authorizationCode

178 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Instantly Ai Agentic Access

186 operations · 112 acting · 2 human-in-the-loop

186 operations · 112 acting

AGENTIC

Resources

Get Started 6

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Signup

Signup

Login

DeveloperPortal

DeveloperPortal

Quickstart

Quickstart

SignUp

SignUp

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

OpenAPI

OpenAPI

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

LlmsText

LLMsTxt

WellKnown

MCPServer

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Conformance

Lifecycle

Webhooks

DataModel

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

ToolCrosswalk

Access & Security 4

Authentication, authorization, and security posture

DomainSecurity

Authentication

Authentication

OAuthScopes

Learn 1

Tutorials, courses, talks, and written guidance

YouTube

YouTube

Operate 5

Status, limits, changes, and where to get help

Help

Support

Community

Deprecation

RateLimits

Commercial 5

Pricing, plans, and the legal terms of use

Pricing

PrivacyPolicy

TermsOfService

Plans

FinOps

Company 4

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Twitter

Twitter

Other 3

Properties that don't map to a standard resource type

App

App

AgentCard

AgentCard

Overlay

Overlay

Source (apis.yml)

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
  publishes a 173-operation OpenAPI 3.1 covering campaigns and subsequences, leads and lead lists, sending accounts and warmup,
  email verification, inbox placement tests, SuperSearch enrichment, blocklists, custom tags, audit logs, background jobs,
  webhooks, analytics, API keys, workspaces and workspace groups. Authentication is a scoped Bearer API key backed by a full
  OAuth 2.0 authorization server with 178 published scopes, PKCE and dynamic client registration. Instantly also runs a hosted
  remote MCP server, publishes an A2A agent card, an llms.txt and first-party Agent Skills.
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid plan required · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - openapi
  generated: '2026-08-13'
  method: derived
  note: 'Corrected from "free" on 2026-08-13. Instantly publishes no free plan — the pricing page starts at $47/month — and
    API access is gated on a paid subscription: 170 of the 173 operations in the published OpenAPI document a 402 response
    meaning "the workspace does not have an active paid plan". Signup is self-serve, but an API key cannot be exercised without
    paying.'
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/instantly-ai.png
tags:
- Cold Email
- Outbound
- Sales
- Deliverability
- Lead Database
- Email Verification
- Webhook
tags_raw:
- Cold Email
- Outbound
- Sales
- Deliverability
- Lead Database
- Email Verification
- Webhooks
created: '2026-05-23'
modified: '2026-08-13'
specificationVersion: '0.23'
apis:
- aid: instantly-ai:instantly-ai-api-v2
  name: Instantly API v2
  description: The full Instantly REST API v2 — 129 paths, 173 operations across 28 resource groups, published as OpenAPI
    3.1.0 by Instantly at api.instantly.ai/openapi/api_v2.json. Every operation carries a unique operationId, a summary and
    documented 401/402/404/429 responses.
  humanURL: https://developer.instantly.ai/api-reference
  baseURL: https://api.instantly.ai/api/v2
  tags:
  - Campaigns
  - Leads
  - Account
  - Email Verification
  - Deliverability
  - Analytics
  - Webhook
  - Workspaces
  tags_raw:
  - Campaigns
  - Leads
  - Accounts
  - Email Verification
  - Deliverability
  - Analytics
  - Webhooks
  - Workspaces
  properties:
  - type: OpenAPI
    url: openapi/instantly-ai-api-v2-openapi.yml
  - type: Overlay
    url: overlays/instantly-ai-api-v2-overlay.yaml
  - type: APIReference
    url: https://developer.instantly.ai/api-reference
  - type: Documentation
    url: https://developer.instantly.ai
- aid: instantly-ai:instantly-ai-campaigns-api
  name: Instantly Campaigns API
  description: The Campaigns API from Instantly — 10 operation(s) for campaigns.
  humanURL: https://developer.instantly.ai/api-reference/groups/campaign
  baseURL: https://api.instantly.ai/api/v2/campaigns
  tags:
  - Campaigns
  properties:
  - type: OpenAPI
    url: openapi/instantly-ai-campaigns-api-openapi.yml
  - type: Documentation
    url: https://developer.instantly.ai/api-reference/groups/campaign
  - type: Documentation
    url: https://developer.instantly.ai/api-reference/groups/lead
  - type: Documentation
    url: https://developer.instantly.ai/api-reference/groups/account
  - type: Documentation
    url: https://developer.instantly.ai/api-reference/groups/email-verification
  - type: Documentation
    url: https://developer.instantly.ai/api-reference/groups/inbox-placement-test
  - type: Documentation
    url: https://developer.instantly.ai/api-reference/groups/webhook
  - type: Documentation
    url: https://developer.instantly.ai/api-reference/groups/analytics
  - type: Documentation
    url: https://developer.instantly.ai/api-reference/groups/api-key
  - type: Documentation
    url: https://developer.instantly.ai/api-reference/groups/workspace
common:
- type: AgenticAccess
  url: agentic-access/instantly-ai-agentic-access.yml
- type: DomainSecurity
  url: security/instantly-ai-domain-security.yml
- type: Authentication
  url: authentication/instantly-ai-authentication.yml
- 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: Login
  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
- type: LlmsText
  url: https://developer.instantly.ai/llms.txt
- type: LLMsTxt
  url: llms/instantly-ai-llms.txt
- type: DeveloperPortal
  url: https://developer.instantly.ai
- type: Quickstart
  url: https://developer.instantly.ai/quickstart
- type: Support
  url: https://help.instantly.ai
- type: Community
  url: https://developer.instantly.ai/getting-started/slack-channel
- type: SignUp
  url: https://app.instantly.ai/auth/signup
- type: GitHubOrganization
  url: https://github.com/Instantly-ai
- type: Packages
  url: packages/instantly-ai-packages.yml
- type: SDKs
  url: packages/instantly-ai-packages.yml
- type: CLI
  url: cli/instantly-ai-cli.yml
- type: WellKnown
  url: well-known/instantly-ai-well-known.yml
- type: MCPServer
  url: mcp/instantly-ai-mcp.yml
- type: ToolCrosswalk
  url: mcp/instantly-ai-tool-crosswalk.yml
- type: AgentCard
  url: a2a/instantly-ai-a2a.yml
- type: AgentSkill
  url: skills/_index.yml
- type: OAuthScopes
  url: scopes/instantly-ai-scopes.yml
- type: Conventions
  url: conventions/instantly-ai-conventions.yml
- type: ErrorCatalog
  url: errors/instantly-ai-problem-types.yml
- type: Conformance
  url: conformance/instantly-ai-conformance.yml
- type: Lifecycle
  url: lifecycle/instantly-ai-lifecycle.yml
- type: Deprecation
  url: https://developer.instantly.ai/guides/api-v1-migration
- type: Webhooks
  url: asyncapi/instantly-ai-webhooks.yml
- type: DataModel
  url: data-model/instantly-ai-data-model.yml
- type: Overlay
  url: overlays/instantly-ai-api-v2-overlay.yaml
- type: Plans
  url: plans/instantly-ai-plans-pricing.yml
- type: RateLimits
  url: rate-limits/instantly-ai-rate-limits.yml
- type: FinOps
  url: finops/instantly-ai-finops.yml
integrations:
- name: Clay
- name: HubSpot
- name: Salesforce
- name: Pipedrive
- name: Zapier
- name: Make
- name: n8n
- name: Slack
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 23
  pass: local-v1

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