Anonymous prepaid API credits
zkAPI
Deposit once on-chain, then make unlinkable off-chain API requests. Server-protected against replay and non-payment; users remain unlinkable via a state-anchor chain.
Post-quantum by default
Cairo STARKs, Poseidon, XMSS. Pedersen is the one isolated EC exception.
Drop-in OpenAI proxy
`clientd` speaks /v1/chat/completions, /v1/responses, and Ollama /api/chat.
Net-settled refunds
Variable refunds via Pedersen homomorphism — no per-request tokens flow.