PayCow vs send21

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

PayCow compared with send21
Detail	PayCow	send21
What it does	One workspace for donations, digital commerce, and crypto payments with funds sent directly to your wallet	Non-custodial crypto payment links and API for people and AI agents
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Paid	Paid
Pricing	Starter: 10 USDT/mo (up to 1,000 USDT monthly volume). Pro: 99 USDT/mo (up to 50,000 USDT monthly volume). Scale: 299 USDT/mo (up to 250,000 USDT monthly volume). Enterprise: Custom pricing (250,000+ USDT monthly volume). 0% transaction commission on all plans.	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.
Key features	Non-custodial direct-to-wallet USDT settlement on Ethereum ERC-20 and Tron TRC-20 Digital delivery of files up to 50 MB and license keys after confirmed payment Branded storefronts at /store/your-brand with product catalogs and checkout Searchable PayCow Marketplace for product discovery Multi-chain RPC node polling for deterministic payment confirmation Multiple destination wallet support with unique serial identifiers for routing Automated webhook notifications with HMAC-SHA256 cryptographic signatures Fixed monthly pricing model with 0% transaction commission	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
What makes it different	0% transaction commission with fixed monthly plans, keeping more per payment as volume grows Funds route directly to merchant wallets with no custodial intermediary holding assets Integrated platform combining donations, marketplace, storefronts, delivery and payments in one dashboard Built-in live stream donation alerts for streamers using OBS or Streamlabs	Not given
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)	2 +2 (up) since last check	6 +2 (up) since last check
Trust Flow (Majestic)	2	15
Citation Flow (Majestic)	18	28
Referring domains (Majestic)	6	35

4 details filled in for both companies.

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