What you can build
Agent-driven payments
Let AI agents pay merchants, subscribe to services, and settle invoices under policy-bound wallets and KYA verification tiers.
Multi-protocol commerce
One SDK, six protocols: UCP, ACP, AP2, x402, A2A, and MCP. Pick the one that fits your integration partner.
Money streaming
Per-second payment flows with configurable buffers, runways, and programmable termination.
Stablecoin payouts
Cross-border transfers in seconds with live FX quoting, auditable settlement, and on-chain receipts.
Two paths to your first integration
Guided wizard (recommended)
Pick a use-case template — API monetization, e-commerce, agent commerce, or recurring payments. The wizard walks you through every step and hands you working credentials in 10-15 minutes.
5-minute API quickstart
Raw cURL or Node SDK. Best if you’ve integrated payments before and want to understand the primitives first.
Or start from scratch
Apply for beta access
app.getsly.ai/auth/signup — Sly is currently invitation-only. Approval in 1-3 business days.
Pick your onboarding path
Guided wizard or raw API — see the onboarding overview.
Ship
Move to live when you’re ready. Swap
pk_test_ for pk_live_ — same API, real money.Built for agents
Sly is agent-first from the ground up. Every core capability has a corresponding MCP tool, A2A skill, and Ed25519-authenticated session interface, so autonomous agents can transact without human-readable credentials ever touching the wire.- KYA tiers — formal verification levels (0–3) with graduated spending limits
- Wallet policies — per-agent spending rules, kill-switch, and approval workflows
- Ed25519 auth — short-lived session tokens issued via challenge-response
- MCP catalog — drop-in Claude Desktop integration
- A2A marketplace — agents discover each other’s skills and transact peer-to-peer
Looking for something specific?
API Reference
Full REST reference for every endpoint.
SDKs
Node.js SDK, CLI, and MCP server.
Webhooks
Event catalog, signing, and replay.