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1. observe observe Public

   Harpd x402 V2 observability + budget-control SDK for agent payments — the 4 lifecycle hooks, above any Facilitator. Maintained by Harpd (harpd.com).

   JavaScript 4

2. agent-budget-policy agent-budget-policy Public

   Local, synchronous budget control SDK for agent payments. Declare per-call/agent/endpoint/tool caps and evaluate them before a payment is sent. Maintained by Harpd (harpd.com).

   JavaScript 4

3. x402-logging-middleware x402-logging-middleware Public

   Drop-in x402 payment logging middleware for Node HTTP / Express. Structured, audit-friendly logs for every x402 interaction. Maintained by Harpd (harpd.com).

   JavaScript 4 1

4. mcp-paid-tool-starter mcp-paid-tool-starter Public

   Starter SDK for building MCP tools that require payment before they run. definePaidTool + enforcePayment + runPaidTool. Maintained by Harpd (harpd.com).

   JavaScript 4

5. agent-transaction-audit-schema agent-transaction-audit-schema Public

   Canonical, protocol-agnostic audit record for agent payments. Normalizes x402/MPP/AP2 into one schema and validates it. Maintained by Harpd (harpd.com).

   JavaScript 4 1

6. llm-cost-benchmark llm-cost-benchmark Public

   Public, reproducible LLM cost benchmarks from Harpd (harpd.com) — ranked by cost per successful task, not per-call price.

   JavaScript 4