Add x402 Data API

[Timwal78]

Adding the x402 Data API (Federal grant and financial data endpoint).

[gemini-code-assist]

Code Review

This pull request updates the openapi.yaml file to contain only a single url field pointing to the JSON specification. The reviewer correctly noted that this is not a valid OpenAPI document and requested converting the JSON content to YAML format instead.

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[gemini-code-assist]

The openapi.yaml file should contain a valid OpenAPI specification (typically the YAML equivalent of openapi.json). A single url field is not a valid OpenAPI document and will fail validation with standard OpenAPI parsers, linters, and tools (which expect required fields like openapi, info, and paths). Please convert the openapi.json content to YAML format and place it here.