diff --git a/catalyst-gateway/bin/src/service/api/legacy/v0/fund_get.rs b/catalyst-gateway/bin/src/service/api/legacy/v0/fund_get.rs
new file mode 100644
index 00000000000..5e2b9f5a862
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/api/legacy/v0/fund_get.rs
@@ -0,0 +1,21 @@
+//! Implementation of the GET /setting endpoint
+use poem_openapi::{payload::Json, ApiResponse};
+
+use crate::service::common::{objects::legacy::fund::Fund, responses::WithErrorResponses};
+
+/// Endpoint responses
+#[derive(ApiResponse)]
+pub(crate) enum Responses {
+    /// The default success response.
+    #[oai(status = 200)]
+    Ok(Json<Fund>),
+}
+
+/// All responses
+pub(crate) type AllResponses = WithErrorResponses<Responses>;
+
+/// The service endpoint
+#[allow(clippy::unused_async)]
+pub(crate) async fn endpoint() -> AllResponses {
+    Responses::Ok(Json(Fund::default())).into()
+}
diff --git a/catalyst-gateway/bin/src/service/api/legacy/v0/mod.rs b/catalyst-gateway/bin/src/service/api/legacy/v0/mod.rs
index e92b2ba85e4..73155f68c32 100644
--- a/catalyst-gateway/bin/src/service/api/legacy/v0/mod.rs
+++ b/catalyst-gateway/bin/src/service/api/legacy/v0/mod.rs
@@ -1,12 +1,25 @@
 //! `v0` Endpoints
-use poem_openapi::{payload::Binary, OpenApi};
+use poem_openapi::{
+    param::Path,
+    payload::{Binary, Json},
+    OpenApi,
+};
 
 use crate::service::{
-    common::{auth::none::NoAuthorization, tags::ApiTags},
+    common::{
+        auth::none::NoAuthorization, objects::legacy::vote_history::VoteHistoryItem, tags::ApiTags,
+    },
     utilities::middleware::schema_validation::schema_version_validation,
 };
+
+mod fund_get;
 mod message_post;
 mod plans_get;
+mod proposal_by_id_get;
+mod proposals_get;
+mod proposals_post;
+mod review_by_proposal_id_get;
+mod settings_get;
 
 /// `v0` API Endpoints
 pub(crate) struct V0Api;
@@ -41,4 +54,97 @@ impl V0Api {
     async fn plans_get(&self, _auth: NoAuthorization) -> plans_get::AllResponses {
         plans_get::endpoint().await
     }
+
+    /// Get settings.
+    ///
+    /// Get settings information including fees detail.
+    #[oai(
+        path = "/settings",
+        method = "get",
+        operation_id = "GetSettings",
+        deprecated = true
+    )]
+    async fn settings_get(&self, _auth: NoAuthorization) -> settings_get::AllResponses {
+        settings_get::endpoint().await
+    }
+
+    /// Get fund.
+    ///
+    /// Get fund information.
+    #[oai(
+        path = "/fund/",
+        method = "get",
+        operation_id = "GetFund",
+        deprecated = true
+    )]
+    async fn fund_get(&self, _auth: NoAuthorization) -> fund_get::AllResponses {
+        fund_get::endpoint().await
+    }
+
+    /// Get list of proposals.
+    ///
+    /// Get list of proposals and the proposal's detail.
+    #[oai(
+        path = "/proposals",
+        method = "get",
+        operation_id = "GetProposals",
+        deprecated = true
+    )]
+    async fn proposals_get(&self, _auth: NoAuthorization) -> proposals_get::AllResponses {
+        proposals_get::endpoint().await
+    }
+
+    /// Get list of proposals.
+    ///
+    /// Get list of proposals according to the filter options.
+    /// This is a POST method, only to send the filter data over the HTTP body.
+    #[oai(
+        path = "/proposals",
+        method = "post",
+        operation_id = "GetProposalsByFilter",
+        deprecated = true
+    )]
+    async fn proposals_post(
+        &self, message: Json<Vec<VoteHistoryItem>>, _auth: NoAuthorization,
+    ) -> proposals_post::AllResponses {
+        proposals_post::endpoint(message.0).await
+    }
+
+    /// Get a proposal.
+    ///
+    /// Get a proposal filtering by its identifier.
+    #[oai(
+        path = "/proposals/:id",
+        method = "get",
+        operation_id = "ShowProposalById",
+        deprecated = true
+    )]
+    async fn proposal_by_id_get(
+        &self,
+        /// The proposal identifier to be retrieved.
+        #[oai(validator(max_length = 256, min_length = 0, pattern = "[A-Za-z0-9_-]"))]
+        id: Path<String>,
+        _auth: NoAuthorization,
+    ) -> proposal_by_id_get::AllResponses {
+        proposal_by_id_get::endpoint(id.0).await
+    }
+
+    /// Get proposal reviews.
+    ///
+    /// Get proposal reviews by proposal identifier.
+    #[oai(
+        path = "/reviews/:proposal_id",
+        method = "get",
+        operation_id = "GetReviewByProposalId",
+        deprecated = true
+    )]
+    async fn review_by_proposal_id_get(
+        &self,
+        /// The proposal identifier to retrieve the reviews.
+        #[oai(validator(max_length = 256, min_length = 0, pattern = "[A-Za-z0-9_-]"))]
+        proposal_id: Path<String>,
+        _auth: NoAuthorization,
+    ) -> review_by_proposal_id_get::AllResponses {
+        review_by_proposal_id_get::endpoint(proposal_id.0).await
+    }
 }
diff --git a/catalyst-gateway/bin/src/service/api/legacy/v0/proposal_by_id_get.rs b/catalyst-gateway/bin/src/service/api/legacy/v0/proposal_by_id_get.rs
new file mode 100644
index 00000000000..73b60f87a12
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/api/legacy/v0/proposal_by_id_get.rs
@@ -0,0 +1,21 @@
+//! Implementation of the GET /setting endpoint
+use poem_openapi::{payload::Json, ApiResponse};
+
+use crate::service::common::{objects::legacy::proposal::Proposal, responses::WithErrorResponses};
+
+/// Endpoint responses
+#[derive(ApiResponse)]
+pub(crate) enum Responses {
+    /// The default success response.
+    #[oai(status = 200)]
+    Ok(Json<Proposal>),
+}
+
+/// All responses
+pub(crate) type AllResponses = WithErrorResponses<Responses>;
+
+/// The service endpoint
+#[allow(clippy::unused_async)]
+pub(crate) async fn endpoint(_id: String) -> AllResponses {
+    Responses::Ok(Json(Proposal::default())).into()
+}
diff --git a/catalyst-gateway/bin/src/service/api/legacy/v0/proposals_get.rs b/catalyst-gateway/bin/src/service/api/legacy/v0/proposals_get.rs
new file mode 100644
index 00000000000..66f9dd4fda4
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/api/legacy/v0/proposals_get.rs
@@ -0,0 +1,21 @@
+//! Implementation of the GET /setting endpoint
+use poem_openapi::{payload::Json, ApiResponse};
+
+use crate::service::common::{objects::legacy::proposal::Proposal, responses::WithErrorResponses};
+
+/// Endpoint responses
+#[derive(ApiResponse)]
+pub(crate) enum Responses {
+    /// The default success response.
+    #[oai(status = 200)]
+    Ok(Json<Vec<Proposal>>),
+}
+
+/// All responses
+pub(crate) type AllResponses = WithErrorResponses<Responses>;
+
+/// The service endpoint
+#[allow(clippy::unused_async)]
+pub(crate) async fn endpoint() -> AllResponses {
+    Responses::Ok(Json(Default::default())).into()
+}
diff --git a/catalyst-gateway/bin/src/service/api/legacy/v0/proposals_post.rs b/catalyst-gateway/bin/src/service/api/legacy/v0/proposals_post.rs
new file mode 100644
index 00000000000..4ce4b5e90bb
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/api/legacy/v0/proposals_post.rs
@@ -0,0 +1,22 @@
+//! Implementation of the GET /setting endpoint
+use poem_openapi::{payload::Json, ApiResponse};
+
+use super::VoteHistoryItem;
+use crate::service::common::{objects::legacy::proposal::Proposal, responses::WithErrorResponses};
+
+/// Endpoint responses
+#[derive(ApiResponse)]
+pub(crate) enum Responses {
+    /// The default success response.
+    #[oai(status = 200)]
+    Ok(Json<Vec<Proposal>>),
+}
+
+/// All responses
+pub(crate) type AllResponses = WithErrorResponses<Responses>;
+
+/// The service endpoint
+#[allow(clippy::unused_async)]
+pub(crate) async fn endpoint(_message: Vec<VoteHistoryItem>) -> AllResponses {
+    Responses::Ok(Json(Vec::new())).into()
+}
diff --git a/catalyst-gateway/bin/src/service/api/legacy/v0/review_by_proposal_id_get.rs b/catalyst-gateway/bin/src/service/api/legacy/v0/review_by_proposal_id_get.rs
new file mode 100644
index 00000000000..c6d3a170d61
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/api/legacy/v0/review_by_proposal_id_get.rs
@@ -0,0 +1,23 @@
+//! Implementation of the GET /setting endpoint
+use std::collections::HashMap;
+
+use poem_openapi::{payload::Json, ApiResponse};
+
+use crate::service::common::{objects::legacy::review::Review, responses::WithErrorResponses};
+
+/// Endpoint responses
+#[derive(ApiResponse)]
+pub(crate) enum Responses {
+    /// The default success response.
+    #[oai(status = 200)]
+    Ok(Json<HashMap<String, Review>>),
+}
+
+/// All responses
+pub(crate) type AllResponses = WithErrorResponses<Responses>;
+
+/// The service endpoint
+#[allow(clippy::unused_async)]
+pub(crate) async fn endpoint(_id: String) -> AllResponses {
+    Responses::Ok(Json(HashMap::default())).into()
+}
diff --git a/catalyst-gateway/bin/src/service/api/legacy/v0/settings_get.rs b/catalyst-gateway/bin/src/service/api/legacy/v0/settings_get.rs
new file mode 100644
index 00000000000..eef113b86c6
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/api/legacy/v0/settings_get.rs
@@ -0,0 +1,23 @@
+//! Implementation of the GET /setting endpoint
+use poem_openapi::{payload::Json, ApiResponse};
+
+use crate::service::common::{
+    objects::legacy::settings_info::SettingsInfo, responses::WithErrorResponses,
+};
+
+/// Endpoint responses
+#[derive(ApiResponse)]
+pub(crate) enum Responses {
+    /// The default success response.
+    #[oai(status = 200)]
+    Ok(Json<SettingsInfo>),
+}
+
+/// All responses
+pub(crate) type AllResponses = WithErrorResponses<Responses>;
+
+/// The service endpoint
+#[allow(clippy::unused_async)]
+pub(crate) async fn endpoint() -> AllResponses {
+    Responses::Ok(Json(SettingsInfo::default())).into()
+}
diff --git a/catalyst-gateway/bin/src/service/common/objects/legacy/fund.rs b/catalyst-gateway/bin/src/service/common/objects/legacy/fund.rs
new file mode 100644
index 00000000000..bdc279dd632
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/common/objects/legacy/fund.rs
@@ -0,0 +1,11 @@
+//! Define the Fund
+
+use poem_openapi::Object;
+
+/// The fund information object.
+#[allow(clippy::missing_docs_in_private_items)]
+#[derive(Object, Default)]
+pub(crate) struct Fund {
+    #[oai(validator(max_length = 256, min_length = 0, pattern = "[A-Za-z0-9_-]"))]
+    id: String,
+}
diff --git a/catalyst-gateway/bin/src/service/common/objects/legacy/mod.rs b/catalyst-gateway/bin/src/service/common/objects/legacy/mod.rs
index 40b61cca759..ee342458483 100644
--- a/catalyst-gateway/bin/src/service/common/objects/legacy/mod.rs
+++ b/catalyst-gateway/bin/src/service/common/objects/legacy/mod.rs
@@ -7,8 +7,13 @@ pub(crate) mod event_id;
 pub(crate) mod fragment_status;
 pub(crate) mod fragments_batch;
 pub(crate) mod fragments_processing_summary;
+pub(crate) mod fund;
 pub(crate) mod hash;
+pub(crate) mod proposal;
+pub(crate) mod review;
+pub(crate) mod settings_info;
 pub(crate) mod stake_public_key;
+pub(crate) mod vote_history;
 pub(crate) mod vote_plan;
 pub(crate) mod voter_group_id;
 pub(crate) mod voter_info;
diff --git a/catalyst-gateway/bin/src/service/common/objects/legacy/proposal.rs b/catalyst-gateway/bin/src/service/common/objects/legacy/proposal.rs
new file mode 100644
index 00000000000..9581d709a45
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/common/objects/legacy/proposal.rs
@@ -0,0 +1,60 @@
+//! Define the Proposal
+
+use std::collections::HashMap;
+
+use poem_openapi::Object;
+
+/// The proposal object.
+#[allow(clippy::missing_docs_in_private_items)]
+#[allow(clippy::struct_field_names)]
+#[derive(Object, Default)]
+pub(crate) struct Proposal {
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    internal_id: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    chain_voteplan_id: String,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    chain_proposal_index: u32,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    chain_vote_encryption_key: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    chain_voteplan_payload: String,
+    #[oai(validator(
+        max_length = 32767,
+        min_length = 0,
+        pattern = "[\\s\\S]",
+        max_properties = 100,
+        min_properties = 0
+    ))]
+    chain_vote_options: HashMap<String, String>,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    proposal_public_key: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    fund_id: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    proposal_summary: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    proposal_importance: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    proposal_title: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    proposal_goal: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    proposal_url: String,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    proposal_funds: u32,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    reviews_count: u32,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    proposal_impact_score: u32,
+    #[oai]
+    proposer: Option<Proposer>,
+}
+
+/// The proposer object.
+#[allow(clippy::missing_docs_in_private_items)]
+#[derive(Object, Default)]
+pub(crate) struct Proposer {
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    proposer_name: String,
+}
diff --git a/catalyst-gateway/bin/src/service/common/objects/legacy/review.rs b/catalyst-gateway/bin/src/service/common/objects/legacy/review.rs
new file mode 100644
index 00000000000..f46c04abe57
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/common/objects/legacy/review.rs
@@ -0,0 +1,25 @@
+//! Define the Review
+
+use poem_openapi::Object;
+
+/// The proposal review object from a reviewer.
+#[allow(clippy::missing_docs_in_private_items)]
+#[derive(Object, Default)]
+pub(crate) struct Review {
+    #[oai(validator(max_length = 256, min_length = 0, pattern = "[A-Za-z0-9_-]"))]
+    id: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    assessor: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    impact_alignment_note: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    impact_alignment_rating_given: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    auditability_note: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    auditability_rating_given: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    feasibility_note: String,
+    #[oai(validator(max_length = 32767, min_length = 0, pattern = "[\\s\\S]"))]
+    feasibility_rating_given: String,
+}
diff --git a/catalyst-gateway/bin/src/service/common/objects/legacy/settings_info.rs b/catalyst-gateway/bin/src/service/common/objects/legacy/settings_info.rs
new file mode 100644
index 00000000000..537374d0ea7
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/common/objects/legacy/settings_info.rs
@@ -0,0 +1,61 @@
+//! Define the Settings Info
+
+use poem_openapi::Object;
+
+/// The setting info object.
+#[allow(clippy::missing_docs_in_private_items)]
+#[derive(Object, Default)]
+pub(crate) struct SettingsInfo {
+    #[oai(
+        rename = "block0Hash",
+        validator(max_length = 66, min_length = 0, pattern = "[0-9a-f]")
+    )]
+    block_0_hash: String,
+    #[oai]
+    fees: Fees,
+    #[oai(
+        rename = "slotsPerEpoch",
+        validator(max_length = 256, min_length = 1, pattern = "[0-9]+")
+    )]
+    slots_per_epoch: String,
+}
+
+/// The fee information object.
+#[allow(clippy::missing_docs_in_private_items)]
+#[allow(clippy::struct_field_names)]
+#[derive(Object, Default)]
+pub(crate) struct Fees {
+    #[oai]
+    per_certificate_fees: PerCertificateFee,
+    #[oai]
+    per_vote_certificate_fees: PerVoteCertificateFees,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    constant: u32,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    coefficient: u32,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    certificate: u32,
+}
+
+/// The per-certificate fee object.
+#[allow(clippy::missing_docs_in_private_items)]
+#[allow(clippy::struct_field_names)]
+#[derive(Object, Default)]
+pub(crate) struct PerCertificateFee {
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    certificate_pool_registration: u32,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    certificate_stake_delegation: u32,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    certificate_owner_stake_delegation: u32,
+}
+
+/// The per-vote certificate fee object.
+#[allow(clippy::missing_docs_in_private_items)]
+#[derive(Object, Default)]
+pub(crate) struct PerVoteCertificateFees {
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    certificate_vote_plan: u32,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    certificate_vote_cast: u32,
+}
diff --git a/catalyst-gateway/bin/src/service/common/objects/legacy/vote_history.rs b/catalyst-gateway/bin/src/service/common/objects/legacy/vote_history.rs
new file mode 100644
index 00000000000..a46b41cbb74
--- /dev/null
+++ b/catalyst-gateway/bin/src/service/common/objects/legacy/vote_history.rs
@@ -0,0 +1,13 @@
+//! Define the Vote history
+
+use poem_openapi::Object;
+
+/// An option item to specify proposal to query.
+#[allow(clippy::missing_docs_in_private_items)]
+#[derive(Object, Default)]
+pub(crate) struct VoteHistoryItem {
+    #[oai(validator(max_length = 256, min_length = 0, pattern = "[A-Za-z0-9_-]"))]
+    vote_plan_id: String,
+    #[oai(validator(minimum(value = "0"), maximum(value = "4294967295")))]
+    indexes: u32,
+}
diff --git a/catalyst-gateway/tests/.oapi-v3.spectral.yml b/catalyst-gateway/tests/.oapi-v3.spectral.yml
index 9d8710175cc..c126c3dc7c6 100644
--- a/catalyst-gateway/tests/.oapi-v3.spectral.yml
+++ b/catalyst-gateway/tests/.oapi-v3.spectral.yml
@@ -92,6 +92,8 @@ overrides:
   # ONLY Legacy endpoints may be added to this override.
   - files:
       - "**#/components/schemas/FragmentStatus"
+      - "**#/components/schemas/Review"
+      - "**#/components/schemas/Proposal/properties/chain_vote_options"
     rules:
       # Ref: https://github.com/stoplightio/spectral-owasp-ruleset/blob/2fd49c377794222352ff10dee99ed2a106c35199/src/ruleset.ts#L678
       owasp:api3:2023-no-additionalProperties: off
@@ -101,6 +103,9 @@ overrides:
   - files:
       - "**#/paths/~1api~1v0~1vote~1active~1plans/get/responses"
       - "**#/paths/~1api~1v1~1votes~1plan~1account-votes~1%7Baccount_id%7D/get/responses"
+      - "**#/paths/~1api~1v0~1proposals/get/responses"
+      - "**#/paths/~1api~1v0~1proposals/post/requestBody"
+      - "**#/paths/~1api~1v0~1proposals/post/responses"
     rules:
       # Ref: https://github.com/stoplightio/spectral-owasp-ruleset/blob/2fd49c377794222352ff10dee99ed2a106c35199/src/ruleset.ts#L506
       owasp:api4:2023-array-limit: off
@@ -109,6 +114,7 @@ overrides:
   # ONLY Legacy endpoints may be added to this override.
   - files:
       - "**#/paths/~1api~1v1~1fragments~1statuses/get/responses"
+      - "**#/paths/~1api~1v0~1reviews~1%7Bproposal_id%7D/get/responses"
     rules:
       # Ref: https://github.com/stoplightio/spectral-owasp-ruleset/blob/2fd49c377794222352ff10dee99ed2a106c35199/src/ruleset.ts#L678
       owasp:api3:2023-constrained-additionalProperties: off