Directory
Twilio
SMS, voice and WhatsApp API
PaidEmail, forms & notificationstwilio.com
What it is
The default programmable communications API for SMS, MMS, voice, WhatsApp and RCS. Provides phone number provisioning, two-way messaging webhooks, Verify for one-time passcodes, and Messaging Services with automatic number pooling and compliance handling. Also owns SendGrid and Segment.
Why it earns a slot
When you need an SMS one-time code or an alert that reaches a phone, Twilio is three lines and works in almost every country. Verify handles the whole OTP flow including rate limiting and fraud checks.
Know before you commit
US A2P 10DLC brand and campaign registration is mandatory before sending to US numbers — expect registration fees plus days of carrier review. Carrier surcharges are billed on top of the quoted per-message rate.
Getting started
npm i twilio
Neighbourhood
How Twilio sits against the rest of the atlas — swaps, companions and the tools builders actually save alongside it.
Instead of thisDiscord WebhooksFormikReact EmailReact Hook FormSlack Incoming WebhooksAmazon SESBasinCourierFillout
Named in the wiringSendGrid
Also in Email, forms & notifications
Amazon SES
aws.amazon.comNot yet swept
Cheapest bulk email (AWS)
PaidEmail, forms & notifications
A la carte $0.10 per 1,000 emails. Essentials plan $0.16 per 1,000. Outbound attachment data $0.12/GB, managed dedicated IPs $15/mo. New AWS accounts get up to $200 in Free Tier credits.
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Basin
usebasin.comNot yet swept
Form backend with spam blocking
Free tier + paidEmail, forms & notifications
Free: 50 submissions/mo, 1 form, 30-day retention. Starter $12.50/mo (250), Growth $24.17/mo (1,000, unlimited forms), Pro $30.62/mo (5,000), Agency $81.25/mo (25,000), billed yearly.
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Courier
courier.comNot yet swept
Multi-channel notification API
Free tier + paidEmail, forms & notifications
Free Developer: 10,000 sends/mo. Business is usage-based at $0.005 per send beyond that. Enterprise is custom with volume discounts.
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Discord Webhooks
docs.discord.comNot yet swept
Community alerts via webhook
FreeEmail, forms & notifications
Free. No bot user, OAuth or authentication required; standard Discord API rate limits apply per webhook.
Open dossier