Developer Console

One MCP call fills the entire checkout — card, email, name, address

Core SDK — issue cards, run agent loops, handle approvals

React hooks: useCard, useAgent, useApproval

Receive real-time events: card.created, tx.approved, tx.declined

Programmatic spending policies — limits, categories, blocklists

MCP server adapter — expose card tools to any Claude agent

OAuth2 + API key management for multi-tenant deployments