The best verified APIs for agents in 2026

APIs for agents expose data or actions in a form that autonomous software can call. The category ranges from search and web extraction to payments, identity, sandboxes and specialised model services. A conventional API can work well for an agent when its authentication, errors and limits are predictable; an agent-oriented API may add tool definitions, structured responses or protocol adapters. Selection should begin with the required action and the consequences of a bad call. Review authentication scope, idempotency, rate limits, pricing, observability and whether a human approval step can be added for sensitive operations. Structured documentation and stable error responses also make recovery easier. Attest verifies that the listed public site resolves and displays real product evidence, plus any supplied public repository. It does not call every endpoint, assess data quality or certify a service for autonomous spending. This page is rendered from the live verified directory, ranks entries by recorded launch recency and links every API listing to the evidence record that states what Attest actually checked.