An SDK hides the x402 handshake behind a few lines of code: middleware for servers, a client wrapper for the agent side. These libraries span languages and frameworks so you can integrate pay-per-request quickly — and are cross-listed in the per-language categories when they target one stack specifically.
Below are the x402 SDKs and client libraries in the directory.
The SDKs & Clients category right now
175 SDKs & Clients SDKs are tracked here, together holding 1,822 GitHub stars. Attention is concentrated: 3 repositories account for the bulk of it, with agentpay-sdk (516★) at the top, while the median project sits at 1★. Treat the tail as prior art and reference code rather than production dependencies.
Language mix: TypeScript (47%) and Python (15%). Repeat publishers matter in this category — go:github.com (12), @armory-sh (4), agentscore (4) ship more than one project each. Most-used topics: ai-agents, x402, sdk.
Momentum check: 43% of these SDKs saw a commit in the past quarter (44 in the past month alone), while 31 have been dormant for more than a year — activity is uneven — check the last-commit date before adopting. tael-protocol is the most recently updated repository in the group.
Figures recomputed from the tracked repositories on every build.
