Payment confirmation for your own cold wallets
Your wallets.
Our watch.
Exact-amount crypto payments, sent straight to addresses you control. A webhook the moment they confirm on-chain. No custody of funds. No KYC.
Get your API key
Start in one request.
Your key is ready immediately. Activate the free Starter plan with a donation of at least $5 to the EFF, then receive up to 100 payment events a month.
Your API key
Store it now. It cannot be recovered.
To activate it, send exactly this donation to the EFF
Your key works for registering addresses immediately, and starts accepting payments once the donation confirms on-chain, before the expires_at time shown above.
Never custodial
Addresses stay under your control. Payments go straight to your wallets; Confirmations never touches funds.
Ten chains
Native-token payments across Bitcoin, Ethereum and eight more networks. See all ten chains.
Built for agents
llms.txt, OpenAPI, MCP and a machine-readable CLI. Everything your coding agent needs to integrate.