This API lets you send handwritten notes to your customers or contacts. The notes are actually written by robots, not printed with a handwriting-style font. Use this to send handwritten letters to your key customers or prospects.

$3.55 per use

This API lets you create & send physical mail, like post cards and letters. Use it to send letters to VIP customers or automate sending important documents, like contracts.

Starting at $0.67 per letter

This powerful API lets you transcode videos, compress them, add subtitles, edit them, and more. Use it to auto-generate videos from text/visual content, add subtitles to social media videos, or add simple video cropping/editing to your product.

Free for videos of up to 10 minutes, then starting at ~$15 per month

Get profile information, interact with users, react to videos, etc. This unofficial API lets you do a whole lot on the massively popular TikTok platform. Use it to create a database of influencers, automatically grow your following, find trends, etc. There's always a risk with using unofficial APIs like this, but they can be super helpful when building MVPs or proof of concepts.

Starting at $29 p/m for 300 requests

Transistor is a podcast hosting platform that's just released an API which lets you manage podcasts, episodes, and private podcast subscribers. Use this to automate your podcast editing and publish flow, create custom podcast embeds in your site/app, or start an exclusive community for your private podcast subscribers.

From $19 per month

An API for scheduling social media posts. There are many social media scheduling tools, but finding a decent API to automate posting & scheduling is harder than it initially seems. The Buffer API, which I use, is no longer open for new customers. Ayrshare is an API first option that lets you schedule posts to Facebook, LinkedIn, Twitter, Reddit, and Telegram.

Free for 300 scheduled posts p/m, then custom

An API that lets you monitor Google search results from locations around the globe. Use this API to create SEO tools, monitor how your site appears in Google searches from other countries, or generate sales leads based in changes in Google search rankings, ratings, and more. The possibilities with this API are endless and I'm sure you can come up with more creative ideas than me!

From $50 per month for 5,000 searches

An API for sending and receiving iMessages and SMS. Use this API to stand out by contacting your iPhone loving customers with iMessages instead of SMS messages. This API is in beta and likely has to iron out some bugs, but seems promising. Messages default to SMS when sent to devices that don't support iMessage.

From $19.99 per month

An API for building waiting lists and referral programs. Use this API to create a viral waiting list for your new product or feature launch. Let people jump the queue by referring their friends - a proven tactic that you can now use without having to re-invent the wheel.

From free

An API that auto-generates social media visuals, e-commerce banners, and more. Use this API to automatically generate OG images, e-commerce images, and banners for the various social networks and ad platforms. Create a design once, generate an infinite variations.

Starting at $29 per month for 500 images per month