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AgentPhone SMS Message Send
phonevoicesmscallssocial
AgentPhone SMS Message Send is a paid API for AI agents from AgentPhone at mpp.orthogonal.com, paid per call via MPP, $0.03/call, not verified (last probed 2026-10-10); live alternatives: Spraay SMS Payment Notification ($0.02) and PaySponge Textbelt SMS Send ($0.02).
Agents call it through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5. Live alternatives for the same use case: Spraay SMS Payment Notification ($0.02) · PaySponge Textbelt SMS Send ($0.02).
Send an outbound SMS message from an AI agent's provisioned phone number to a recipient, with first-message compliance requirements.
Price / call$0.03
Success17%
StatusUnknown
How this service works
Send an SMS from an agent's phone number. First message compliance: Your initial SMS to any new contact must include (1) your brand name, (2) opt-in confirmation, and (3) opt-out instructions (e.g., "Reply STOP to unsubscribe"). Non-compliant first messages may be silently filtered by carriers.
Output
Returns a delivery confirmation including a message ID, delivery status, timestamp, and the sending phone number. Confirms whether the message was queued or sent successfully.
Example use cases
Example prompt
“Send an SMS from my AgentPhone number to +15551234567 saying: 'Hi, this is Bloom Coffee. Reply STOP to opt out. Your order is ready for pickup!' — make sure it includes the opt-in disclosure since it's our first message to this contact.”
Technical details
Endpoint
POSThttps://mpp.orthogonal.com/agentphone/v1/messages?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to send outbound SMS to a human contact using a real US/Canada phone number provisioned via AgentPhone. Prefer this over email or push notification when SMS delivery is required. This is the right choice when the agent already has a provisioned number (via the Numbers endpoint) and needs to initiate or continue a text conversation, especially for notifications, alerts, or customer outreach workflows.
Side effects
- Missing first-message compliance text (brand name or opt-out) causes rejection
- Invalid or unprovisioned sender phone number returns 400 or 403 error
- Recipient number in unsupported region or invalid format
- Message body exceeds SMS character limits
- Insufficient USDC balance or unpaid account returns payment error
- Rate limiting if too many messages sent in short succession
Tags
phonevoicesmscallssocial
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