REST endpoints
Marketing tools with
a real public API.
Every tool I track that publishes a REST API you can actually read. Hook it into your warehouse, dashboards, scheduled jobs, or agent stack. Auth, SDK language, and OpenAPI spec verified at source, not guessed.
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Need a specific API?
Type a tool name or a category. Jump straight to auth, SDK languages, rate limits, and which plan unlocks the API.
Why it matters
What to look for in a marketing API
Three things separate a usable API from a frustrating one. An OpenAPI / Swagger spec means you can auto-generate typed clients. Official SDKs save auth boilerplate. Webhooks mean you can react to events instead of polling on a cron.
Each card shows these signals at a glance. Click into a tool for pricing per tier, rate limits, and a quickstart snippet.
My shortlist
Highest Agent-Fit Scores
The APIs that behave well under an agent. Scored on auth depth, action coverage, rate-limit honesty, and how predictable the responses are. The ones I'd wire into a Claude or LangChain stack first.
PromptWatch
AI Search Visibility (GEO)
AI visibility and GEO platform with a free tier and a 59-tool MCP server plus REST API on every plan.
SE Ranking
Top Picks
Complete SEO platform with AI visibility tracking, rank monitoring, and competitive research tools.
DataForSEO
SEO APIs
API-first SEO data platform for developers building SEO tools and software solutions
Zernio
Social Media Automation
Developer-first social and ads API with an MCP server, covering 16 social platforms and 7 ad networks.
AirOps
AI Search Visibility (GEO)
AI search visibility tracker paired with Quill, an agent that drafts, refreshes, and publishes content for you.
Outstand
Social Media Automation
Unified social media API and MCP server for 11 platforms, priced per post instead of per seat.
Spec-published
APIs with an OpenAPI Spec
These publish a machine-readable spec. Drop the URL into Postman, generate a typed Node / Python / Go client, skip the docs-page wrangling.
PromptWatch
AI Search Visibility (GEO)
AI visibility and GEO platform with a free tier and a 59-tool MCP server plus REST API on every plan.
Finseo
AI Search Visibility (GEO)
Enterprise AI visibility tracker for ChatGPT, Claude, Gemini and Perplexity, with a REST API and MCP server.
Leadpages
Top Picks
Drag-and-drop landing page builder with 200+ templates and strong conversion optimization tools
Loops
Email Marketing
API-first email platform designed specifically for SaaS teams and product-focused businesses
Resend
Email Marketing
Developer-focused email API with React templates and modern tooling for transactional and marketing emails
Rankability
Top Picks
AI-powered SEO tool for content optimization and AI search tracking built for agencies.
SearchApi
SEO APIs
Real-time SERP API with pay-per-success pricing and precise geo-targeting for data collection.
Frase
SEO Software
AI-powered SEO content platform with research, optimization, and AI search visibility tracking
Mailchimp
Email Marketing
Popular email marketing platform that's become overpriced with declining value for most users
Publer
Social Media Automation
Social scheduler with a free-forever plan, per-account pricing from $4/mo billed yearly, and an official MCP server.
Builderall
All-in-One Marketing
All-in-one marketing platform with 25+ tools including website builder, email marketing, and course creation
GoHighLevel
All-in-One Marketing
All-in-one CRM and marketing platform designed for agencies. Replaces multiple tools but has a steep learning curve.
ValueSERP
SEO APIs
A pay-as-you-go Google SERP API for developers who need structured search data without enterprise contracts.
LinkResearchTools
SEO Software
Enterprise-grade backlink audit and disavow platform, priced for enterprise budgets.
Flodesk
Email Marketing
Visual email marketing platform with stunning templates and creator-focused features for designers and online businesses
Instapage
Top Picks
Drag-and-drop landing page builder with A/B testing and personalization for marketers
LanderLab
Sales Funnel
AI-powered landing page builder specialized for performance marketing with proven templates and native integrations
Zenserp
SEO APIs
A pay-per-successful-request SERP API covering Google, Bing, Yandex, and YouTube for developers.
Morningscore
SEO Software
Gamified all-in-one SEO and GEO tool: rank tracking, backlinks, audits, AI-visibility tracking, and an AI writer.
bundle.social
Social Media Automation
Social media management platform with a full dashboard plus a developer API, official MCP server and CLI. Unlimited users and accounts on every plan.
Docs-only
Other APIs
Public API documented, but no OpenAPI spec detected. You write the wrappers yourself. Still usable, just more legwork.
Kit
Top Picks
Creator-focused email marketing platform with powerful automations and integrated monetization tools
Mailjet
Email Marketing
Email platform combining marketing campaigns with developer APIs and volume-based pricing
Profound
AI Search Visibility (GEO)
AI search visibility platform tracking how your brand shows up across ChatGPT, Perplexity and other AI engines.
SE Ranking
Top Picks
Complete SEO platform with AI visibility tracking, rank monitoring, and competitive research tools.
Sequenzy
Email Marketing
AI-powered email marketing platform built specifically for SaaS with native Stripe integration
Superlines
AI Search Visibility (GEO)
Finnish AI search intelligence platform: tracks 10+ AI engines from real interfaces, with MCP and API on every plan.
ActiveCampaign
Top Picks
AI-powered email marketing and automation platform for businesses serious about personalized campaigns
Ahrefs
SEO Software
Comprehensive SEO platform with powerful backlink analysis and keyword research tools
DataForSEO
SEO APIs
API-first SEO data platform for developers building SEO tools and software solutions
Klaviyo
Email Marketing
AI-powered marketing automation platform for ecommerce businesses with unified customer data and omnichannel campaigns
Omnisend
Email Marketing
Ecommerce-focused email and SMS marketing platform with powerful automation and 160+ integrations
Semrush
Top Picks
Complete SEO platform with AI search tracking, keyword research, competitor analysis, and content optimization tools.
Systeme.io
Top Picks
Complete marketing platform with sales funnels, email marketing, courses, and more at budget-friendly prices
AWeber
Email Marketing
Established email marketing platform with 27 years of experience, AI features, and reliable fundamentals
Ayrshare
Social Media Automation
Developer-focused social media API for posting to 13+ platforms. Starting at $149/month.
beehiiv
Top Picks
All-in-one newsletter platform with built-in website builder and monetization tools for creators
Blotato
Social Media Automation
AI-powered social media automation with viral templates and cross-platform publishing for creators.
Bolta.ai
Social Media Automation
AI-powered social media automation with 28 specialist agents for content creation and cross-platform publishing
Bright Data
SEO Software
Web scraping and proxy infrastructure with 400M+ residential IPs.
Buffer
Social Media Automation
The original social media scheduler with 11 platforms, AI assistant, and forever-free plan for 3 channels.
Clickfunnels
All-in-One Marketing
All-in-one marketing platform for building sales funnels, hosting courses, and managing customers
Crawly
SEO Software
Free native macOS SEO crawler with built-in MCP server (Windows and Linux coming soon).
HubSpot
All-in-One Marketing
All-in-one CRM and marketing platform with a real free tier, per-seat paid plans, and credit-metered AI features.
MailerLite
Email Marketing
Affordable email marketing with surprisingly powerful features and stellar support
Mailgun
Email Marketing
Developer-focused email API platform for transactional emails and high-volume sending with 99%+ deliverability
Postmark
Email Marketing
Developer-focused transactional email API with industry-leading speed and deliverability for apps
Screaming Frog
SEO Software
Desktop SEO crawler for technical audits with unlimited crawling for $279/year
SerpApi
SEO APIs
A search-engine scraping API with 100+ engine coverage, an MCP server, and pricing that climbs fast.
Serpstat
SEO Software
All-in-one SEO platform (8.62B keywords, 529B backlinks) with an official open-source MCP server for Claude and Gemini.
SimilarWeb
SEO Software
Digital market intelligence platform for traffic analysis and competitive research.
Thinkific
Online Course Platforms
Course platform with drag-and-drop builder, communities, and commerce tools for educators and businesses
Unbounce
Sales Funnel
Drag-and-drop landing page builder with A/B testing and AI optimization for marketers and agencies
Unipile
Social Media Automation
Unified communication API for developers to integrate LinkedIn, email, messaging & calendar into apps
Zernio
Social Media Automation
Developer-first social and ads API with an MCP server, covering 16 social platforms and 7 ad networks.
Customer.io
Email Marketing
Advanced customer engagement platform with AI agents, starting at $100/month for data-driven teams
Drip
Email Marketing
Advanced email marketing automation for B2C businesses with powerful segmentation and workflows starting at $39/mo
Encharge
Email Marketing
SaaS-focused email automation platform with behavior-based triggers starting at $99/month
Ghost
Email Marketing
Publishing platform with built-in newsletter and membership monetization. No platform fees on revenue.
Kajabi
Online Course Platforms
All-in-one platform for course creators, coaches, and experts to build, market, and sell knowledge products
LowFruits
SEO Software
SERP-focused keyword research tool that analyzes competition weaknesses beyond traditional KD scores
Mangools
Top Picks
User-friendly SEO suite with excellent keyword research tools and competitive pricing for agencies
NeuronWriter
AI Content SEO
NLP content scoring plus AI Overview and chatbot citation tracking, starting at $23/mo.
SISTRIX
SEO Software
German SEO suite known for the Visibility Index, European data hosting, and a price tag to match.
Zoho Campaigns
Email Marketing
Email marketing platform with SMS and deep Zoho ecosystem integration for business users
Botify
SEO Software
Enterprise SEO platform with AI search optimization and custom pricing for large-scale sites
Brevo
Top Picks
All-in-one email marketing platform with SMS, automation, and AI features at competitive prices
Buttondown
Email Marketing
Minimal newsletter platform with markdown support and privacy-first approach for content creators
Constant Contact
Email Marketing
Established email marketing platform with simple tools but outdated features at $12-80/month
GetResponse
Top Picks
AI-powered email marketing platform with automation, landing pages, and webinars starting at $19/month
Keap
Email Marketing
All-in-one CRM and marketing automation platform for small businesses ready to scale operations
Keywords Everywhere
SEO Software
Browser extension for keyword data, not a full SEO suite.
Majestic
SEO Software
Backlink intelligence platform with proprietary Trust Flow metrics, but API access sits on the priciest tier.
Plunk
Email Marketing
Open-source email platform with $0.001/email pricing, unlimited contacts, and self-hosting options
Sender
Top Picks
Affordable email marketing platform with generous free plan and multichannel automation
SpyFu
SEO Software
Competitive intelligence tool for Google Ads and SEO research with 18+ years of historical data
SurferSEO
Top Picks
AI visibility and SEO platform for optimizing content to rank and get cited across Google, ChatGPT, Gemini, and Perplexity
Wincher
SEO Software
SEO rank tracker with keyword research, on-page checks, and white-label reporting for small teams.
Benchmark Email
Email Marketing
Simple email builder with AI tools but no automation or A/B testing
Conductor
AI Search Visibility (GEO)
Enterprise AEO + SEO platform combining AI visibility tracking, content generation, and site monitoring.
MailerSend
Email Marketing
Developer-focused transactional email API with team collaboration features and competitive pricing
Outranking
AI Content SEO
AI content briefs, first drafts, and on-page SEO scoring built for agency-scale output.
AccuRanker
SEO Software
Daily rank tracking and AI-search visibility tracking, starting at $224/month.
Advanced Web Ranking
SEO Software
SEO rank tracker with AI search visibility, priced for agencies managing multiple clients.
AnswerThePublic
SEO Software
Visual keyword research tool that maps out questions people actually search for online
Campaign Monitor
Email Marketing
Elegant email marketing platform with powerful automation and beautiful templates for growing businesses
EmailOctopus
Email Marketing
Budget-friendly email marketing platform with a generous free plan and simple automation for small businesses.
JetOctopus
SEO Software
A log analyzer and crawler for large sites, tracking Googlebot and AI bot behavior at scale.
Kartra
Top Picks
True all-in-one marketing platform with advanced funnels, email automation, and membership hosting
LearnWorlds
Online Course Platforms
AI-powered course platform with interactive video tools and white-label branding at premium prices
Moosend
Top Picks
Email marketing platform with powerful automation, landing pages, and forms at budget-friendly pricing
Moz
SEO Software
Veteran SEO platform with 20+ years of experience and comprehensive toolkit for rankings, traffic, and optimization
Nightwatch
SEO Software
Rank tracker that also monitors AI citations across ChatGPT, Claude, Gemini, and Perplexity.
Otterly.AI
AI Search Visibility (GEO)
AI search visibility tracker across ChatGPT, Perplexity and Copilot, with a live MCP server and API.
Oxylabs
SEO APIs
Proxy and web scraping infrastructure for data teams, not a plug-and-play marketing dashboard.
Perspective Funnels
Top Picks
Mobile-first funnel builder with interactive features and high conversion templates for modern marketers.
Postiz
Social Media Automation
Open-source social media scheduler for 30+ platforms with built-in AI agents and a public REST API. Self-hostable or use the hosted version.
Scrunch AI
AI Search Visibility (GEO)
AI search visibility platform tracking brand mentions across ChatGPT, Perplexity and more, from $250/month.
Seobility
SEO Software
User-friendly SEO platform with website auditing, keyword tracking, and backlink analysis for all skill levels.
Teachable
Online Course Platforms
Course platform with AI tools, global payments, and mobile apps for serious creators scaling worldwide
Wishpond
All-in-one marketing platform with landing pages, email marketing, and lead generation tools
Yoast SEO
SEO Software
WordPress SEO plugin with real-time optimization guidance and content analysis for 13+ million sites
Keysearch
SEO Software
Affordable SEO tool with keyword research, competitor analysis, and AI content features for growing websites
Landingi
Top Picks
Landing page builder with AI assistance, A/B testing, and 170+ integrations for marketers
Selzy
Email Marketing
Budget email marketing with flexible pricing and strong support, but basic automation features
AgencyAnalytics
SEO Software
White-label client reporting for agencies, aggregating 85+ marketing data sources with confirmed MCP access.
AIclicks
AI visibility tracker monitoring brand mentions across 10+ LLMs, from $59/month.
AirOps
AI Search Visibility (GEO)
AI search visibility tracker paired with Quill, an agent that drafts, refreshes, and publishes content for you.
Aiso
AI Search Visibility (GEO)
AI visibility tracker built on a consent panel of real human-AI conversations, with a REST API and hosted MCP.
Arvow
AI Content SEO
AI-powered content automation platform that generates and publishes SEO articles across multiple CMS platforms
AthenaHQ
AI Search Visibility (GEO)
AI search visibility tracker with a built-in content optimization agent, from $295/month.
AutoSEO
SEO Software
AI SEO autopilot that publishes a researched article a day and builds network backlinks, for Google and AI search.
BabyLoveGrowth
AI Content SEO
AI SEO autopilot: ~30 optimized articles a month, backlinks, and AI-search tracking for Google and ChatGPT traffic.
BlogSEO
SEO Software
AI SEO platform that writes and auto-publishes optimized blog articles to WordPress, Webflow, Ghost and more.
BrightLocal
SEO Software
Local SEO platform for rank tracking, citations, and reviews, from $39/location/mo, now with an MCP server.
Chatbase
AI support agent builder with deep integrations, model choice, and a steep price ladder past the entry tier.
ChatSEO
SEO Software
An AI SEO co-pilot that reads your Google Search Console data and hands you prioritized fixes, with a hosted MCP server.
Crisp
Customer Support
Omnichannel support platform with AI agents and flat per-workspace pricing.
EngageBay
All-in-One Marketing
Affordable all-in-one CRM with email marketing, automation, and customer support for small businesses
Genviral
Social Media Automation
AI social scheduler and short-form content engine with a full REST API and CLI built for AI agents.
Hootsuite
Social Media Automation
Veteran social media management suite with AI drafting, listening, and inbox tools, priced per user, per month.
Intercom
AI-native helpdesk combining human agents and Fin AI Agent, priced per seat plus per resolution.
Landbot
No-code chatbot builder for website, Messenger, and WhatsApp with AI agent flows.
LLM Pulse
AI Search Visibility (GEO)
AI search visibility tracker with a hosted MCP server and REST API, monitoring your brand across 10+ AI models.
LLMClicks
AI visibility tracking, audits, and listicle placements for GEO, sold as a one-time lifetime deal.
ManyChat
AI Lead-Generation Chatbots
A social-first chat marketing tool for Instagram, Messenger, WhatsApp and SMS lead capture.
Omnia
AI Search Visibility (GEO)
AI search visibility tracker that turns citation data into a weekly action plan for lean teams.
Ontraport
Marketing CRM
All-in-one CRM with enterprise power at mid-market prices, beating HubSpot in most G2 categories
Outrank
SEO Software
AI SEO content autopilot that auto-generates and publishes optimized articles to your CMS, plus a backlink exchange.
Outstand
Social Media Automation
Unified social media API and MCP server for 11 platforms, priced per post instead of per seat.
Peec AI
AI Search Visibility (GEO)
AI search visibility analytics tracking your brand across ChatGPT, Perplexity and Gemini, with MCP on every paid plan.
Peekaboo AI
AI visibility tracker for ChatGPT, Gemini, and Perplexity mentions, priced per brand.
post bridge
Social Media Automation
Affordable cross-platform scheduler with MCP agent access on every plan, starting at $29/month.
Post for Me
Social Media Automation
Unified social media posting API for developers, covering 9 platforms from $10/mo.
PosterMyWall
Social Media Automation
Design-first all-in-one: AI creative, social scheduling, email, and event pages in one affordable place.
PostFast
Social Media Automation
11-platform social scheduler with MCP server and API included on every tier, starting at €12/month.
Ranklytics
SEO Software
AI SEO autopilot with rank tracking and AI-visibility monitoring: writes, publishes and tracks content in one tool.
RankPilot
SEO Software
AI SEO autopilot and AI-visibility tracker: writes and publishes articles, with a white-label agency tier.
Rankshift
AI Search Visibility (GEO)
AI search visibility tracker for 9 LLMs, with a real MCP server and REST API from its Professional plan.
RobotSpeed
SEO Software
AI SEO autopilot: writes and publishes articles, builds backlinks, and tracks Google and AI-search visibility.
SE Visible
AI Search Visibility (GEO)
AI search visibility tracker from the SE Ranking team, monitoring your brand across ChatGPT, Gemini and Perplexity.
Search Atlas
SEO Software
AI SEO platform built on the OTTO agent, with an official 587-tool MCP server for Claude, GPT and Gemini.
Searchable
AI Search Visibility (GEO)
AI search visibility platform with an official MCP server and REST API on every paid plan, from $125/mo.
SEObot
AI Content SEO
AI agent that autonomously creates, optimizes, and publishes SEO content with CMS integrations
Sight AI
SEO Software
AI SEO agent that writes and publishes articles and tracks AI-search visibility, with a Slack approval workflow.
SiteGPT
A website-trained AI chatbot with its own CLI, API, and MCP server for AI-agent workflows.
SocialPilot
Social Media Management
Social scheduling and reputation management for agencies, priced by account tier, not per seat.
Sorank
AI Search Visibility (GEO)
GEO and SEO autopilot: generates AI-first articles, builds backlinks, fixes technical SEO and tracks AI mentions.
Temso AI
AI Search Visibility (GEO)
Closed-loop AEO platform that tracks AI search visibility and runs an AI agent to act on it, with a REST API.
Tidio
AI Lead-Generation Chatbots
A live chat and support platform with the Lyro AI agent that can plug into your stack via REST API and MCP.
Typebot
Open-source, no-code chatbot builder for websites and WhatsApp, priced by chat volume.
WoopSocial
Social Media Automation
AI social scheduler with a native MCP server and REST API, built to be driven by agents.
Prefer an MCP server?
If you're wiring tools into Claude, Cursor, or Codex, an MCP server is usually less code than the REST API. The /mcp directory lists every tool that ships one.
See the MCP directory