Spix
Voice, SMS and email infrastructure for AI agents — MCP-native, ~500ms call latency, CLI-first
0About Spix
Spix gives an AI agent a phone number, an inbox and a voice — the communications primitives that most agent frameworks leave as an exercise for the developer. Install once and the agent can place and receive voice calls, send and receive SMS, and send email, all driven from the CLI or over MCP. The voice pipeline is the substantial part: outbound and inbound AI calls run through real-time transcription and LLM conversation logic with speech synthesis at roughly 500ms end-to-end latency, and calls are driven by reusable playbooks rather than ad-hoc prompts, so a call is a repeatable artefact. Installation is a single curl script, with one-click install prompts published for Claude Code, Codex, OpenClaw and Hermes Agent, which is a clear signal about who the product is for. Billing is a hybrid that suits agent workloads: monthly plans set concurrency limits, email-event allowances and a bundled credit allocation, while usage beyond that draws on credit packs priced from $0.0100 down to $0.0088 per credit at volume. Phone numbers and extra inboxes are add-ons at $3-$5/month. A free Sandbox tier lets you test the voice path before spending anything.
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Key Features
Spix Pros & Cons
✅ Pros
- +Covers voice, SMS and email in one install instead of stitching three vendors together
- +MCP-native means any compatible agent gets telephony without custom glue code
- +Free sandbox lets you validate the voice pipeline before committing
- +Volume credit packs make high-call-count workloads meaningfully cheaper
- +Playbooks turn calls into versioned artefacts rather than one-off prompts
⚠️ Cons
- −Plan credits plus credit packs plus per-number add-ons make total cost hard to forecast
- −2 concurrent calls on the $20 tier is very limiting for anything beyond testing
- −Giving an autonomous agent outbound calling capability carries obvious compliance risk
- −Documentation-first, CLI-first design assumes a developer operator
Who Is Spix Best For?
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