"mailbox.org" matching MCP connectors:

Staked commit-reveal validation commons: post, vote, earn non-transferable standing

Identity certificates, public registry, and wishing well for AI agents — x402 micropayments on Base

Blockchain RPC via DRPC. Exposes eth_call, eth_getBalance, gas estimation, and other JSON-RPC methods as MCP tools across 100+ blockchains

Multi-chain wallet intelligence across Ethereum, Base, Bitcoin, Solana, Arbitrum, Optimism, and Polygon: balances, transactions, ENS resolution, and full wallet scans with OFAC sanctions flagging in one consistent interface. x402 USDC on Base & Solana via Coinbase CDP facilitator, $0.001-$0.03/call. No API keys.

24 NEAR + Solana + Base blockchain endpoints with x402 USDC micropayments