Phone & Voice

Phone-number intelligence (Twilio Lookup) and AI-powered outbound voice calls (Bland.ai) through ClawRouter's local proxy. Payment is automatic via x402 from the user's BlockRun wallet.

Shortcuts:

• Slash: /cr-call +1<E.164> "<task>" [--voice nat] [--max-duration 5] [--from +1<owned-number>] [--language en-US]
• CLI: clawrouter phone numbers list/buy/renew/release, clawrouter phone lookup <+E.164>, clawrouter phone fraud <+E.164>
• Partner tools (LLM-callable): blockrun_phone_lookup, blockrun_phone_lookup_fraud, blockrun_phone_numbers_buy/renew/list/release, blockrun_voice_call, blockrun_voice_status

⚠️ Real-world side effects. blockrun_voice_call places a real outbound phone call to a real number. Only invoke when the user has explicitly asked for a call to be placed. Server enforces an emergency-number blocklist.

Phone Number Intelligence (Twilio)

Carrier + Line Type Lookup — $0.01

POST to http://localhost:8402/v1/phone/lookup:

{ "phoneNumber": "+14155552671" }

Returns carrier name, line type (mobile / landline / voip), country, mobile country/network codes. Use to verify whether a number is reachable, detect VoIP/spam patterns, or route SMS appropriately.

Fraud Risk Check — $0.05

POST to http://localhost:8402/v1/phone/lookup/fraud:

{ "phoneNumber": "+14155552671" }

Adds SIM-swap recency and call-forwarding signals on top of carrier+line type. Run this before sending sensitive SMS codes or initiating account-recovery flows — a number flagged for recent SIM swap is high-risk for account takeover.

Wallet-Owned Phone Numbers

Numbers are leased for 30 days, bound to the wallet's payer address. Use one as the from parameter of voice_call to present a stable caller ID.

Buy — $5.00 / 30 days

POST to http://localhost:8402/v1/phone/numbers/buy:

{ "country": "US", "areaCode": "415" }

country is "US" or "CA". areaCode is optional (3-digit, best-effort match). Returns { phone_number, expires_at, chain }.

Renew — $5.00 / +30 days

POST to http://localhost:8402/v1/phone/numbers/renew:

{ "phoneNumber": "+14155551234" }

Run before the existing lease expires. Numbers not renewed are released back to the pool.

List — $0.001

POST to http://localhost:8402/v1/phone/numbers/list with an empty body. Returns an array of { phone_number, expires_at, country, chain }. The CLI surfaces this as a human table with renew-soon warnings:

$ clawrouter phone numbers list

Active numbers (2):
  +14155551234   US   expires 2026-06-12 (in 27d)
  +12135555678   US   expires 2026-05-18 (in 2d) ⚠ renew soon

Release — free

POST to http://localhost:8402/v1/phone/numbers/release:

{ "phoneNumber": "+14155551234" }

No refund. Use only when the user has explicitly asked to give up the number.

AI Voice Call (Bland.ai)

Place a Call — $0.54 flat (up to 30 min)

POST to http://localhost:8402/v1/voice/call:

{
  "to": "+14155552671",
  "task": "Call and confirm the 3pm Thursday meeting; reschedule if they can't make it.",
  "voice": "nat",
  "max_duration": 5,
  "from": "+14155551234",
  "language": "en-US"
}

Required: to (E.164), task (free-form natural language — what the AI should say or accomplish).

Optional:

from auto-pick rules (server-side, after payment verification):

If an explicit from is supplied but the wallet doesn't own it, the response is 403 with a clear ownership-mismatch message (no charge taken when validation fails).

Response is fire-and-forget:

{
  "call_id": "call_abc123",
  "poll_url": "/v1/voice/call/call_abc123",
  "status": "queued"
}

The call runs in the cloud for up to max_duration minutes. The HTTP response returns immediately — do not wait for the call to finish. Poll voice_status every 10–30s to retrieve transcript and recording when the call completes.

Poll Status — free

GET http://localhost:8402/v1/voice/call/{call_id}. Returns:

{
  "call_id": "call_abc123",
  "status": "completed",
  "duration_seconds": 47,
  "transcript": [
    { "role": "assistant", "text": "Hi, this is calling to confirm tomorrow's 3pm meeting..." },
    { "role": "user", "text": "Yes, that still works." }
  ],
  "recording_url": "https://..."
}

status progresses through queued → in_progress → completed or failed. The transcript array and recording URL only appear on completed. On failed, an error field describes why.

Example Agentic Flows

Verify before texting:

User: "Send a verification code to +1 415 555 0123" Agent: First call blockrun_phone_lookup_fraud({ phoneNumber: "+14155550123" }). If sim_swap.last_sim_swap is within the past 7 days, refuse and ask the user to confirm out-of-band. Otherwise proceed.

Appointment confirmation:

User: "Call my client at +1 415 555 0123 and confirm tomorrow's 3pm meeting" Agent: blockrun_voice_call({ to: "+14155550123", task: "Call to confirm the 3pm Thursday meeting; if they can't make it, offer to reschedule for Friday morning.", max_duration: 5 }). Returns call_id. Tell the user: "Calling now — I'll have the transcript in a few minutes." Then blockrun_voice_status({ callId }) every 30s until completed, then summarize the transcript.

Acquire dedicated caller ID:

User: "Buy me a San Francisco number for the next 30 days" Agent: blockrun_phone_numbers_buy({ country: "US", areaCode: "415" }). Confirm the assigned number to the user and warn them: "Lease expires in 30 days, costs $5 to renew."

Notes

• Payment is automatic on every call — an x402 USDC micropayment from the user's wallet, or a draw on account credit if a BlockRun API key is configured.
• If a call fails with a 402, check GET http://localhost:8402/health and read authMode first: wallet → fund the wallet at blockrun.ai; api-key → top up at user.blockrun.ai/dashboard/credits.
• Number leases are bound to the wallet's payer address, so phone numbers list/buy/renew/release and the from parameter are wallet-mode features. In API-key mode the gateway answers those routes with a raw 402 x402 challenge (verified 2026-09-05) because there is no payer address to bind a lease to. Lookups, fraud checks and outbound calls all work on an API key; just let the server auto-pick from.
• Phone numbers are real, regulated resources — numbers bought are reachable from any phone within ~60 seconds of purchase
• Bland.ai's emergency-number blocklist is enforced server-side; ClawRouter does not duplicate it but trusts upstream
• Recordings and transcripts are retained by Bland.ai; ClawRouter does not download them locally (returns the upstream URL)
• For programmatic polling, see the voice_status tool — for one-off CLI checks, hit curl http://localhost:8402/v1/voice/call/{call_id} directly