Pay-per-call or recurring? When to use x402 vs subscriptions
RelAI gives you two ways to charge in USDC: x402 micropayments per call, and on-chain subscriptions per period. Here's the honest guide to picking the right one — and why most products end up using both.
Subscriptions, without the bank account
Recurring billing today means a payment processor, a registered company, a bank account, and a multi-day payout cycle. We built subscriptions that need none of that — recurring USDC on Solana, settled wallet-to-wallet, non-custodial.
The Bank Vault In The Dark: A Plain-English Metaphor For Private Pool V2
An accessible explainer for RelAI's Private Pool V2 — a Sapling-style ZK privacy pool for USDC on Solana. We use a bank vault metaphor that finally makes "anonymity set" click for non-cryptographers. **Slug**: private-pool-v2-bank-vault-metaphor
Private Pool V2: A Sapling-Style UTXO Pool For Private USDC On Solana
RelAI's Private Pool V2 is a Sapling-style UTXO pool for USDC on Solana. Amounts hidden inside Poseidon commitments, internal transfers via JoinSplit2x2, persistent private balance, sponsored fees, ASP-gated compliance. Live on solana-devnet.
Why Digital Gift Cards Still Win Online
Digital gift cards are fast, flexible, and easy to share. Here is why they remain one of the best products for gifting, customer acquisition, and retention online.
Private Claim Links for Solana and EVM: Send USDC Without Exposing the Code
RelAI Payment Codes now support private claim links across Solana and EVM. Send USDC with a shareable link, keep the raw code hidden, and let recipients claim funds or reveal the code later.
Two Ways to Pay: Payment Requests and Payment Codes on SKALE
RelAI introduces two payment code models on SKALE. Payment Requests: merchant creates a code, buyer pays. Payment Codes: buyer pre-signs a code, merchant redeems. Both use EIP-3009, both settle with zero gas.
Dual-Channel Payments: One SDK, Two Protocols - x402 and MPP Side by Side
The @relai-fi/x402 SDK now supports Dual-Channel payments — x402 and MPP (Machine Payment Protocol) running through the same middleware. One protect() call, two payment rails, and every plugin works identically across both.
ERC-8004 Reputation Plugins: On-Chain Trust for Every x402 API
The @relai-fi/x402 SDK now has four ERC-8004 plugins: score(), feedback(), solanaFeedback(), and submitRelayFeedback(). Build verifiable on-chain reputation for your API in minutes.