diff --git a/crates/api_clients/artcraft/artcraft_api_defs/src/generate/cost_estimate/estimate_splat_cost.rs b/crates/api_clients/artcraft/artcraft_api_defs/src/generate/cost_estimate/estimate_splat_cost.rs
new file mode 100644
index 0000000000..a42355bfe8
--- /dev/null
+++ b/crates/api_clients/artcraft/artcraft_api_defs/src/generate/cost_estimate/estimate_splat_cost.rs
@@ -0,0 +1,59 @@
+use serde::{Deserialize, Serialize};
+use utoipa::ToSchema;
+
+use enums::common::generation::common_splat_model::CommonSplatModel;
+use enums::common::generation_provider::GenerationProvider;
+
+pub const ESTIMATE_SPLAT_COST_PATH: &str = "/v1/generate/cost_estimate/splat";
+
+/// Request body for the splat cost estimate endpoint.
+#[derive(Serialize, Deserialize, ToSchema)]
+pub struct EstimateSplatCostRequest {
+  /// The splat model to estimate costs for.
+  pub model: CommonSplatModel,
+
+  /// The provider to route the generation through.
+  pub provider: GenerationProvider,
+
+  /// Whether the request includes a reference image.
+  pub has_reference_image: Option<bool>,
+}
+
+/// Response body for the splat cost estimate endpoint.
+#[derive(Serialize, Deserialize, ToSchema)]
+pub struct EstimateSplatCostResponse {
+  pub success: bool,
+
+  /// Estimated cost in credits.
+  pub cost_in_credits: Option<u64>,
+
+  /// Estimated cost in USD cents.
+  pub cost_in_usd_cents: Option<u64>,
+
+  /// Whether the generation is free for this user/plan.
+  pub is_free: bool,
+
+  /// Whether the user has unlimited generations.
+  pub is_unlimited: bool,
+
+  /// Whether the user is rate limited.
+  pub is_rate_limited: bool,
+
+  /// Whether the output will have a watermark.
+  pub has_watermark: bool,
+}
+
+/// Error response for the splat cost estimate endpoint.
+#[derive(Serialize, Deserialize, ToSchema)]
+pub struct EstimateSplatCostError {
+  pub success: bool,
+  pub error_type: EstimateSplatCostErrorType,
+  pub error_message: String,
+}
+
+#[derive(Serialize, Deserialize, ToSchema)]
+#[serde(rename_all = "snake_case")]
+pub enum EstimateSplatCostErrorType {
+  InvalidProviderForModel,
+  InvalidInput,
+}
diff --git a/crates/api_clients/artcraft/artcraft_api_defs/src/generate/cost_estimate/mod.rs b/crates/api_clients/artcraft/artcraft_api_defs/src/generate/cost_estimate/mod.rs
index e38c09aebf..bcae15ceae 100644
--- a/crates/api_clients/artcraft/artcraft_api_defs/src/generate/cost_estimate/mod.rs
+++ b/crates/api_clients/artcraft/artcraft_api_defs/src/generate/cost_estimate/mod.rs
@@ -1,2 +1,3 @@
 pub mod estimate_image_cost;
+pub mod estimate_splat_cost;
 pub mod estimate_video_cost;
diff --git a/crates/schema/public/enums/src/common/generation/common_splat_model.rs b/crates/schema/public/enums/src/common/generation/common_splat_model.rs
new file mode 100644
index 0000000000..736800752a
--- /dev/null
+++ b/crates/schema/public/enums/src/common/generation/common_splat_model.rs
@@ -0,0 +1,13 @@
+use utoipa::ToSchema;
+
+/// Splat models available for generation.
+/// Mirrors artcraft_router::api::common_splat_model::CommonSplatModel.
+#[derive(Copy, Clone, Debug, Serialize, Deserialize, ToSchema)]
+#[serde(rename_all = "snake_case")]
+pub enum CommonSplatModel {
+  #[serde(rename = "marble_0p1_mini")]
+  Marble0p1Mini,
+
+  #[serde(rename = "marble_0p1_plus")]
+  Marble0p1Plus,
+}
diff --git a/crates/schema/public/enums/src/common/generation/mod.rs b/crates/schema/public/enums/src/common/generation/mod.rs
index 260f7ba859..d8f3fc034b 100644
--- a/crates/schema/public/enums/src/common/generation/mod.rs
+++ b/crates/schema/public/enums/src/common/generation/mod.rs
@@ -1,4 +1,5 @@
 pub mod common_aspect_ratio;
 pub mod common_image_model;
+pub mod common_splat_model;
 pub mod common_video_model;
 pub mod common_video_resolution;
diff --git a/crates/service/web/storyteller_web/src/http_server/endpoints/generate/cost_estimate/mod.rs b/crates/service/web/storyteller_web/src/http_server/endpoints/generate/cost_estimate/mod.rs
index c10a6ca15e..8b571e6700 100644
--- a/crates/service/web/storyteller_web/src/http_server/endpoints/generate/cost_estimate/mod.rs
+++ b/crates/service/web/storyteller_web/src/http_server/endpoints/generate/cost_estimate/mod.rs
@@ -1,2 +1,3 @@
 pub mod image;
+pub mod splat;
 pub mod video;
diff --git a/crates/service/web/storyteller_web/src/http_server/endpoints/generate/cost_estimate/splat/estimate_splat_cost_handler.rs b/crates/service/web/storyteller_web/src/http_server/endpoints/generate/cost_estimate/splat/estimate_splat_cost_handler.rs
new file mode 100644
index 0000000000..d3bda8e151
--- /dev/null
+++ b/crates/service/web/storyteller_web/src/http_server/endpoints/generate/cost_estimate/splat/estimate_splat_cost_handler.rs
@@ -0,0 +1,124 @@
+use std::fmt::{Display, Formatter};
+
+use actix_http::StatusCode;
+use actix_web::web::Json;
+use actix_web::{HttpResponse, ResponseError};
+use artcraft_api_defs::generate::cost_estimate::estimate_splat_cost::{
+  EstimateSplatCostError, EstimateSplatCostErrorType, EstimateSplatCostRequest,
+  EstimateSplatCostResponse,
+};
+use artcraft_router::api::common_splat_model::CommonSplatModel as RouterSplatModel;
+use artcraft_router::api::provider::Provider as RouterProvider;
+use artcraft_router::generate::generate_splat::generate_splat_request::GenerateSplatRequest;
+use enums::common::generation::common_splat_model::CommonSplatModel;
+use enums::common::generation_provider::GenerationProvider;
+
+
+/// Estimate the credit and USD cost of a splat generation request.
+/// Does not require authentication and does not charge any credits.
+#[utoipa::path(
+  post,
+  tag = "Cost Estimate",
+  path = "/v1/generate/cost_estimate/splat",
+  responses(
+    (status = 200, description = "Cost estimate", body = EstimateSplatCostResponse),
+    (status = 400, description = "Invalid request", body = EstimateSplatCostError),
+  ),
+)]
+pub async fn estimate_splat_cost_handler(
+  request: Json<EstimateSplatCostRequest>,
+) -> Result<Json<EstimateSplatCostResponse>, HandlerError> {
+  let router_provider = map_provider(request.provider, request.model)?;
+  let router_model = map_splat_model(request.model);
+
+  let router_request = GenerateSplatRequest {
+    model: router_model,
+    provider: router_provider,
+    prompt: None,
+    reference_images: if request.has_reference_image.unwrap_or(false) {
+      // NB: The cost estimation only cares whether a reference image is present,
+      // not the actual image data. We pass None here; the plan will detect
+      // "has reference image" from the model's cost function.
+      // However, the build() path requires no images to estimate cost.
+      None
+    } else {
+      None
+    },
+    idempotency_token: None,
+  };
+
+  let plan = router_request.build()
+    .map_err(|e| HandlerError::InvalidInput(format!("{}", e)))?;
+
+  let estimate = plan.estimate_costs();
+
+  Ok(Json(EstimateSplatCostResponse {
+    success: true,
+    cost_in_credits: estimate.cost_in_credits,
+    cost_in_usd_cents: estimate.cost_in_usd_cents,
+    is_free: estimate.is_free,
+    is_unlimited: estimate.is_unlimited,
+    is_rate_limited: estimate.is_rate_limited,
+    has_watermark: estimate.has_watermark,
+  }))
+}
+
+/// Local error type — wraps the serializable API error struct so we can implement
+/// ResponseError (orphan rules prevent implementing it directly on the foreign type).
+#[derive(Debug)]
+pub enum HandlerError {
+  InvalidProviderForModel { provider: String, model: String },
+  InvalidInput(String),
+}
+
+impl std::error::Error for HandlerError {}
+
+impl Display for HandlerError {
+  fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+    write!(f, "{:?}", self)
+  }
+}
+
+impl ResponseError for HandlerError {
+  fn status_code(&self) -> StatusCode {
+    StatusCode::BAD_REQUEST
+  }
+
+  fn error_response(&self) -> HttpResponse {
+    let (error_type, error_message) = match self {
+      HandlerError::InvalidProviderForModel { provider, model } => (
+        EstimateSplatCostErrorType::InvalidProviderForModel,
+        format!("Provider '{}' is not supported for model '{}'", provider, model),
+      ),
+      HandlerError::InvalidInput(msg) => (
+        EstimateSplatCostErrorType::InvalidInput,
+        msg.clone(),
+      ),
+    };
+    HttpResponse::BadRequest().json(EstimateSplatCostError {
+      success: false,
+      error_type,
+      error_message,
+    })
+  }
+}
+
+fn map_provider(
+  provider: GenerationProvider,
+  model: CommonSplatModel,
+) -> Result<RouterProvider, HandlerError> {
+  match provider {
+    GenerationProvider::Artcraft => Ok(RouterProvider::Artcraft),
+    other => Err(HandlerError::InvalidProviderForModel {
+      provider: format!("{:?}", other),
+      model: format!("{:?}", model),
+    }),
+  }
+}
+
+fn map_splat_model(model: CommonSplatModel) -> RouterSplatModel {
+  match model {
+    CommonSplatModel::Marble0p1Mini => RouterSplatModel::Marble0p1Mini,
+    CommonSplatModel::Marble0p1Plus => RouterSplatModel::Marble0p1Plus,
+  }
+}
diff --git a/crates/service/web/storyteller_web/src/http_server/endpoints/generate/cost_estimate/splat/mod.rs b/crates/service/web/storyteller_web/src/http_server/endpoints/generate/cost_estimate/splat/mod.rs
new file mode 100644
index 0000000000..c7557cdd13
--- /dev/null
+++ b/crates/service/web/storyteller_web/src/http_server/endpoints/generate/cost_estimate/splat/mod.rs
@@ -0,0 +1 @@
+pub mod estimate_splat_cost_handler;
diff --git a/crates/service/web/storyteller_web/src/http_server/routes/application_routes/generate_routes.rs b/crates/service/web/storyteller_web/src/http_server/routes/application_routes/generate_routes.rs
index 012ef22d26..1a458e883e 100644
--- a/crates/service/web/storyteller_web/src/http_server/routes/application_routes/generate_routes.rs
+++ b/crates/service/web/storyteller_web/src/http_server/routes/application_routes/generate_routes.rs
@@ -1,4 +1,5 @@
 use crate::http_server::endpoints::generate::cost_estimate::image::estimate_image_cost_handler::estimate_image_cost_handler;
+use crate::http_server::endpoints::generate::cost_estimate::splat::estimate_splat_cost_handler::estimate_splat_cost_handler;
 use crate::http_server::endpoints::generate::cost_estimate::video::estimate_video_cost_handler::estimate_video_cost_handler;
 use crate::http_server::endpoints::generate::image::edit::flux_pro_kontext_max_edit_image_handler::flux_pro_kontext_max_edit_image_handler;
 use crate::http_server::endpoints::generate::image::edit::gemini_25_flash_edit_image_handler::gemini_25_flash_edit_image_handler;
@@ -65,6 +66,10 @@ where
               .route(web::post().to(estimate_image_cost_handler))
               .route(web::head().to(|| HttpResponse::Ok()))
           )
+          .service(web::resource("/splat")
+              .route(web::post().to(estimate_splat_cost_handler))
+              .route(web::head().to(|| HttpResponse::Ok()))
+          )
           .service(web::resource("/video")
               .route(web::post().to(estimate_video_cost_handler))
               .route(web::head().to(|| HttpResponse::Ok()))