Pay for x402 services on XDC with USDC from your own non-custodial smart wallet, with an on-chain spending limit your agents cannot exceed. The agent never pays gas (EIP-3009).

JS library for interacting with [Soroban](https://soroban.stellar.org/) smart contract `spending-limit-policy` via Soroban RPC.

Give an AI agent a funded wallet and a spending limit in seconds. The agent pays APIs autonomously, within its budget. Sandbox.

Run multiple promise-returning & async functions with limited concurrency

Basic IP rate-limiting middleware for Express. Use to limit repeated requests to public APIs and/or endpoints such as password reset.

Call an array of promise-returning functions, restricting concurrency to a specified limit.

A fast function for calculating where a string should be truncated, given an optional width limit and an ellipsis string.

CLI tool for Size Limit

A Redis store for the `express-rate-limit` middleware

File size plugin for Size Limit

Run an array of functions in parallel, but limit the number of tasks executing at the same time

limits calls to functions that return promises

This package is a helper to run multiple promise-returning & async functions with limited concurrency.

A low overhead rate limiter for your routes

Limit the cost of a GraphQL Query.

Bitcoin Miniscript, a high-level language for describing Bitcoin spending conditions. It includes a compiler/analyzer with a signer‑agnostic satisfier that derives symbolic witnesses (e.g., <sig(key)>).

async.mapLimit's functionality available as a standalone npm module

MCP server that lets an AI agent pay for x402 resources on Stellar. Holds exactly one key, runs locally over stdio.

esbuild plugin for Size Limit

Size Limit preset for small open source libraries