Variable.missionEndpointString
const missionEndpointString: z.ZodPipe<z.ZodString, z.ZodTransform<string, string>>;
x402 endpoint of a mission: METHOD host/path, optionally with an
http(s):// scheme in front of the host. Normalized to the canonical form
(POST api.exa.ai/search): method upper-cased, host lower-cased, scheme,
query and fragment removed, trailing slash removed except on the root /.
Ambiguous forms are rejected, not normalized: a method outside
MISSION_ENDPOINT_METHODS, a % in the path, a . or .. segment, an
empty segment (//).