The Execution API Specification for Ethereum provides an exhaustive standard of JSON-RPC methods implemented by all execution clients. This essential interface enables downstream tools and infrastructure to interact seamlessly with various Ethereum clients, enhancing modularity and interchangeability. The specification, crafted in OpenRPC and structured across multiple files for clarity, can be built into a unified document and validated syntactically using OpenRPC tools. Comprehensive testing mechanisms, such as speccheck and spelling validation, ensure adherence to the specifications and accuracy. Additionally, the project supports a GraphQL schema as proposed in EIP-1767, with live specifications and validation scripts available for integration and testing. The repository is openly licensed under CC0, inviting contributions and adaptations within the community.