PARTNER

Phone & Voice

AI voice calls + wallet-owned phone numbers, paid in USDC via Circle Gateway.

Outbound conversational AI calls via Bland.ai, and dedicated US/CA phone numbers via Twilio. Numbers auto-register with Bland on purchase so they can be used as outbound caller-ID. Carrier and fraud lookups round it out. Every endpoint pay-per-use.

8 endpoints live on Polygon · Arbitrum · Optimism · Unichain

Real-time conversation

Wallet-bound numbers

No account required

Twilio Bland.ai Bland Docs

US/CA ONLY · NO SMS

Number provisioning is currently limited to US and Canada. SMS is not offered — A2P 10DLC registration adds 1–4 week onboarding friction. Inbound (receiving calls) isn't enabled yet; this is outbound-only for now.

What Agents Use It For

Anywhere your agent needs to reach a human in real time — verification callbacks, appointment reminders, voice surveys, automated outbound — without standing up telephony infrastructure or signing carrier contracts.

AI Voice Calls

Outbound conversational AI calls powered by Bland.ai. The agent dials, speaks, listens, and responds in real time based on a natural-language task prompt.

Wallet-Owned Numbers

Provision a dedicated US or Canadian number bound to your wallet for 30 days. Use it as caller ID on outbound calls via Bland (BYOT auto-imported on purchase).

Carrier + Fraud Lookup

Identify line type, carrier, and risk signals like SIM swap and call forwarding. Useful for KYC, anti-fraud, or routing decisions before calling.

Pay-per-Use, No Accounts

Every endpoint settled in USDC via Circle Gateway across Polygon, Arbitrum, Optimism, and Unichain. No API keys, no monthly subscription for callers.

Endpoints & Pricing

All endpoints are 402-gated. Send a request without payment to receive payment requirements, then re-send with a Circle Gateway signature attached. Settlement happens after the upstream Twilio or Bland call succeeds — failed upstream calls are not charged.

Method	Endpoint	Price	Purpose
POST	/v1/voice/call	$0.54	Outbound AI conversation call (Bland.ai). Defaults to 5 min, max 30 min.
GET	/v1/voice/call/{call_id}	free	Poll call status, duration, transcript, and recording URL.
POST	/v1/phone/numbers/buy	$5.00	Provision a dedicated US/CA number, wallet-bound for 30 days.
POST	/v1/phone/numbers/renew	$5.00	Extend the lease on a provisioned number by 30 days.
POST	/v1/phone/numbers/list	$0.001	List active numbers owned by your wallet.
POST	/v1/phone/numbers/release	free	Release a provisioned number back to the Twilio pool.
POST	/v1/phone/lookup	$0.01	Carrier identification + line type (landline, mobile, VoIP).
POST	/v1/phone/lookup/fraud	$0.05	Lookup + fraud signals (SIM swap, call forwarding).

How It Works

Buy a number (optional)

POST /v1/phone/numbers/buy → pay $5 USDC → receive a US/CA number leased to your wallet for 30 days. Automatically registered with Bland for outbound caller-ID.

Place an AI call

POST /v1/voice/call with a natural-language task and the destination number. Optionally pass your own number as 'from' for caller-ID. Settlement happens after Bland accepts the call.

Poll for transcript

GET /v1/voice/call/{call_id} returns status, duration, full transcript, and recording URL. Free — no payment needed.

Behind the Scenes

Twilio

Powers number search, purchase, lease management, release, and carrier + fraud lookups. We absorb Twilio's per-month carrier fee in the $5 number price.

twilio.com

Bland.ai

Powers the actual voice AI — STT, LLM, TTS, interruption detection, voicemail handling. Your Twilio numbers are imported into Bland on purchase so they can be used as outbound caller-ID (BYOT).

bland.ai

Get Started

All you need is USDC pre-deposited at the Circle Gateway on any of Polygon, Arbitrum, Optimism, or Unichain. Hit any endpoint, get a 402, attach payment, get the response.

View Docs View on GitHub