SQL write authorization for agents
Agents call SQLGuard (MCP or HTTP), settle Exact USDC on Base, receive an Ed25519 PASS certificate, then POST /v1/verify before executing. Primary expand SKU: Session Cert $0.50 / 10 slots. First taste: Instant Cert $0.05. Free Probe is a tip only — not authorize.
Runnable path
POST https://sqlguard.io/v1/session
Header: X-SQLGuard-Agent: <0x-wallet>
Body: {"agent_id":"<0x-wallet>"}
# 402 → Exact USDC Base → 0xC8d524703f1751b565a220087D1d4c44a413C1D7 ($0.50)
# Then POST /v1/session/cert → POST /v1/verify → execute
# First taste:
POST https://sqlguard.io/v1/cert # $0.05 Exact
# Free tip only (not authorize):
POST https://sqlguard.io/v1/probe