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Palmyr Phone Call Speak
x402
Palmyr Phone Call Speak is a paid API for AI agents from palmyr.ai, paid per call via x402, $0.08/call, status unknown (last checked 2026-09-13).
Send text-to-speech audio into an active phone call identified by a call control ID, paying $0.08 USDC per call via x402 on Solana or Base.
Price / call$0.08
Success—
StatusUnknown
How this service works
Autonomous infrastructure for AI agents — pay with USDC on Solana or Base via x402.
Output
A confirmation that the text-to-speech audio was successfully injected into the active phone call identified by the callControlId, along with any status details about the speak action.
Example use cases
Example prompt
“Say 'Your appointment is confirmed for tomorrow at 3pm. Thank you for calling.' into the active call with control ID abc-123-xyz right now.”
Technical details
Endpoint
POSThttps://palmyr.ai/phone/calls/%7BcallControlId%7D/speakWhen to prefer
Use this endpoint when you need to inject synthesized speech into a live, in-progress phone call and you have a valid callControlId. Ideal for AI agent telephony workflows where autonomous bots need to speak during calls, deliver dynamic messages mid-call, or run IVR-style interactions — and you are equipped to pay per-call in USDC via x402 on Solana or Base.
Side effects
- Invalid or expired callControlId returns 404 or error — call may have ended
- Insufficient USDC payment or failed x402 payment flow returns 402 Payment Required
- Text content missing or malformed returns 400 Bad Request
- Call already terminated before speak action is processed
- Network latency causes speak action to arrive too late in call lifecycle
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | — | |
| output | — |
Tags
x402
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