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Documentation Index

Fetch the complete documentation index at: https://docs.buildwithchirp.com/llms.txt

Use this file to discover all available pages before exploring further.

Chirp offers transparent, pay-as-you-go pricing with no hidden fees.

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Phone Numbers

Phone numbers have two cost components: Purchase Fee One-time cost when you acquire a new phone number. Monthly Rental Recurring monthly fee to maintain ownership of the phone number.

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Message Pricing

Messages are billed based on:
  • Message type (SMS or MMS)
  • Direction (inbound or outbound)
  • Phone number type (local, toll-free, short code)
  • Destination carrier

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SMS Messages

Text-only messages. Pricing varies by:
  • Number type (local, toll-free, short code)
  • Carrier (AT&T, T-Mobile, Verizon, etc.)
  • Direction (inbound vs outbound)
Typical Range: 0.0079−0.0079 - 0.015 per message

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MMS Messages

Messages with media (images, videos, audio). MMS is more expensive than SMS. Typical Range: 0.02−0.02 - 0.03 per message

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Test Mode is Free

All messages sent using test API keys (sk_test_app_*) are completely free. This includes:
  • Messages sent through the Playground
  • API calls using test keys
  • Webhook testing
There are no limits on test messages.

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Billing

You’re only charged for:
  • Phone number rental fees (monthly)
  • Messages sent with live API keys (sk_live_app_*)
  • Phone number purchase fees (one-time)
You’re not charged for:
  • API requests
  • Webhook deliveries
  • Messages in test mode
  • Failed messages

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Volume Discounts

High-volume customers may qualify for discounted rates. Contact our sales team for custom pricing.