every agent runtime can learn to pay for things by reading one file. is a published instruction set that teaches an agent how to use ampersend. an agent that loads it knows how to create its account, make paid HTTP requests with a single command, and browse a live marketplace of services it can buy: web search with full page contents, working email addresses, AI-driven voice calls, image and video generation, and LLM inference across providers without per-provider accounts. the safety model runs on co-approval between two parties. funds stay in an account the user owns, spending limits set once in the ampersend app get checked on every payment, and money moves only when the app and the agent approve the same transaction. agents hold zero long-lived credentials, so a compromised or confused agent has nothing to drain. setup takes two commands. npx skills add edgeandnode/ampersend-sdk#skills#/latest installs the skill into Claude Code, Cursor, Codex, and most other runtimes, then npm install -g @ ampersend_ai/ampersend-sdk adds the CLI. from there, ampersend fetch --pay works against any compatible paid endpoint on the open web.