Make a real test payment from your own wallet on Bitcoin, Solana, Ethereum, Base, Arbitrum and Polygon test networks. No account, no email.
See the whole flow in a few minutes, with no account and no email. An agent gets a scoped API key that can create and track drafts but never spend . Full API: /swagger | agent overview: /llms.txt | status via GET /drafts/ {id} /status or signed webhooks ( draft.confirmed ). Create a free account and send your first pay link. Developer docs : Developer docs | API quickstart | Webhooks | MCP server for AI agents | Use send21 with Muse Code | Currencies and networks | Lightning payments | Draft integrity and hashing
Pricing & access
Send21 has a free tier, with paid plans unlocking more. Check send21.io for current plans.
Frequently asked questions
What is Send21?
Send21 is try a crypto pay link on testnet, no account. Make a real test payment from your own wallet on Bitcoin, Solana, Ethereum, Base, Arbitrum and Polygon test networks. No account, no email.
Is Send21 free?
Send21 has a free tier, with paid plans unlocking more.
What are the best Send21 alternatives?
People comparing Send21 also look at Bot403, Cypher eSIM, Reuily, Willder. See all options in the Developer Tools category on SiftFox.
Work on Send21?
Claim this profile for free - instant with a work email at send21.io.
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