send21 vs VoixCall

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

send21 compared with VoixCall
Detail	send21	VoixCall
What it does	Non-custodial crypto payment links and API for people and AI agents	Cheap international calls from your browser or app
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Paid	Paid
Pricing	One fee per payment: 0.49% on $0-$10, 0.39% on $10-$50, 0.29% on $50-$100, 0.19% on $100-$500, 0.14% on $500-$2,000, 0.09% on $2,000-$10,000, 0.04% on $10,000-$50,000, 0.02% on $50,000-$100,000, 0.01% above $100,000. Minimum $0.01, maximum $100. No subscription, setup fee or monthly minimum.	Pay-as-you-go credits starting from 2.5¢/min. Starter: $10 credits (~100-200 minutes); Popular: $25 credits (~500-1000 minutes); Premium: $45 credits + 10% bonus (~900-1800 minutes); Business: $90 credits + 10% bonus (~1800-3600 minutes). Call recording: $0.003/min. Transcripts with AI summaries: $0
Key features	REST API with scoped keys and batch drafts up to 25 per call Support for Bitcoin PSBT and batching wallets like Safe No KYC required, encrypted email storage only Idempotency keys for safe retries Shopify connection with custom app and setup help Fee collected separately on Ethereum and EVM chains via Safe batching	Call 160+ countries from browser or app No software installation required Pay-as-you-go credits from 2.5¢/min Custom caller ID with verified phone number Virtual international phone numbers Call recording with transcripts and AI summaries Encrypted WebRTC calls Crystal-clear HD voice quality Credits never expire SMS-capable virtual numbers
What makes it different	Not given	50x cheaper than traditional carriers with rates from 2.5¢/min No app download needed, works directly in browser Calls to real phone numbers without requiring recipient to have app or internet Optional call transcripts with AI summaries and extracted details Verified caller ID so recipients recognize your calls
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	6 +2 (up) since last check	3 no change since last check
Trust Flow (Majestic)	15	7
Citation Flow (Majestic)	28	26
Referring domains (Majestic)	35	22

4 details filled in for both companies.

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