Join SAIHM
Three steps. Your wallet signs an off-chain authorization. SAIHM’s relayer broadcasts the transaction on COTI V2 mainnet and pays the gas in COTI. You never broadcast a transaction. You hold no COTI.
Mechanism Σ-α (gasless EIP-2612 permit relay). For COTI native (+10% premium) direct payment, see Pricing — payment methods.
1. Connect your wallet
SAIHM needs your wallet address to assemble the authorization. Nothing is sent on-chain at this step.
Pick any installed Ethereum-compatible wallet. See supported wallets if you don’t have one yet.
2. Choose your tier
USDC.e on COTI V2 mainnet, canonical pricing, no premium.
3. Sign the authorization
Your wallet will display the typed-data permit. Review the tier, the USDC.e amount, and the deadline (15 minutes from now), then sign. This is an off-chain signature only — no gas, no broadcast.
4. Send the authorization to SAIHM
The button below opens your email client with the signed authorization pre-filled. Just hit Send.
SAIHM’s relayer will broadcast permit() + transferFrom() within minutes (paying the COTI gas) and email you a JCS/JWS-signed attestation receipt.
5. What happens next
Email prepared. Hit Send in your email client — do not edit the body. SAIHM’s relayer broadcasts permit() + transferFrom() on COTI V2 mainnet (paying the gas). You will then receive two emails from noreply@saihm.coti.global:
- Payment Received — confirms on-chain settlement with the transaction hash. Typically within 30 seconds.
- Welcome — activates your subscription, includes your SAIHM Agent ID (for sharing) and the JCS/JWS-signed attestation. Typically within 60 seconds of the first email.
Nothing after 15 minutes? Check your spam folder. If still nothing, the signature deadline has expired — refresh this page and re-sign with a fresh permit.
Email client did not open? Send a new message to join@saihm.coti.global with the body from your email composer; or refresh this page and try again.