eConsent SMS

eConsent SMS provides a complete compliance layer for outbound text messaging. Every message goes through a multi-step verification pipeline before sending, and every consent interaction is captured as tamper-proof evidence.

Key Features

Feature	Description
Pre-send Check	6-layer compliance gate: quota → quiet hours → frequency caps → revocation → double opt-in → consent
STOP Processing	Automatic keyword recognition (STOP, UNSUBSCRIBE, CANCEL + 7 more) with FCC 10-business-day honor period
HELP Response	Configurable auto-reply with business info per CTIA guidelines
Quiet Hours	Blocks marketing SMS before 8 AM / after 9 PM in recipient’s timezone
Frequency Caps	3/day marketing, 10/day transactional per phone number
Content Validation	Scans for opt-out language, sender ID, and rate disclosure
Double Opt-in	Optional confirmation workflow with 24-hour token expiry
Certificates	HMAC-SHA256 signed consent evidence with full audit trail

API Endpoints

Method	Endpoint	Auth	Description
POST	/v1/sms/register	None	Create an SMS API key
POST	/v1/sms/pre-send	Bearer	Verify consent before sending
POST	/v1/sms/capture-consent	Bearer	Record opt-in consent
POST	/v1/sms/revoke	Bearer	Revoke consent
POST	/v1/sms/message-log	Bearer	Log outbound message with content scan
POST	/v1/sms/stop-webhook	Bearer	Process STOP keyword
POST	/v1/sms/help-webhook	Bearer	Process HELP keyword
POST	/v1/sms/confirm-optin	Bearer	Confirm double opt-in
POST	/v1/sms/validate-content	None	Check message content compliance

Authentication

All authenticated endpoints require a Bearer token:

Authorization: Bearer ec_sms_YOUR_API_KEY

Keys are prefixed with ec_sms_ to distinguish from Voice keys (ec_voice_).

Pricing

Tier	Price	Pre-send Checks	Consent Captures
Free	$0/mo	5,000	0
Growth	$149/mo	50,000	10,000
Scale	$499/mo	500,000	100,000

Tip

SMS runs as a separate Rust binary from Voice. It has its own API keys, quotas, and billing — no Voice subscription required.