diff --git a/backend/src/proposal/proposal.service.ts b/backend/src/proposal/proposal.service.ts
index 896bb22..14a65a9 100644
--- a/backend/src/proposal/proposal.service.ts
+++ b/backend/src/proposal/proposal.service.ts
@@ -88,7 +88,7 @@ export class ProposalService {
       createdEpochNo: govActionProposal.epoch_no,
       url: govActionProposal.url,
       metadataHash: govActionProposal.metadata_hash,
-      protocolParams: govActionProposal.row_to_json,
+      protocolParams: govActionProposal.proposal_params,
       title: govActionProposal.title,
       abstract: govActionProposal.abstract,
       motivation: govActionProposal.motivation,
diff --git a/backend/src/sql/list-proposals.sql b/backend/src/sql/list-proposals.sql
index 392ca68..65da8ad 100644
--- a/backend/src/sql/list-proposals.sql
+++ b/backend/src/sql/list-proposals.sql
@@ -59,7 +59,16 @@ SELECT
     creator_block.epoch_no,
     voting_anchor.url,
     encode(voting_anchor.data_hash, 'hex') AS metadata_hash,
-    ROW_TO_JSON(proposal_params),
+    jsonb_set(
+        ROW_TO_JSON(proposal_params)::jsonb,
+        '{cost_model}', 
+        CASE
+            WHEN cost_model.id IS NOT NULL THEN
+                ROW_TO_JSON(cost_model)::jsonb
+            ELSE
+                'null'::jsonb
+        END
+    ) AS proposal_params,
     off_chain_vote_gov_action_data.title,
     off_chain_vote_gov_action_data.abstract,
     off_chain_vote_gov_action_data.motivation,
@@ -73,7 +82,7 @@ SELECT
     ) AS yes_votes,
     COALESCE(SUM(ldd_drep.amount) FILTER (WHERE voting_procedure.vote::text = 'No'), 0) + (
         CASE WHEN gov_action_proposal.type = 'NoConfidence' THEN
-            0
+            0`
         ELSE
             always_no_confidence_voting_power.amount
         END
@@ -98,6 +107,7 @@ FROM
     JOIN block AS creator_block ON creator_block.id = creator_tx.block_id
     LEFT JOIN voting_anchor ON voting_anchor.id = gov_action_proposal.voting_anchor_id
     LEFT JOIN param_proposal AS proposal_params ON gov_action_proposal.param_proposal = proposal_params.id
+    LEFT JOIN cost_model AS cost_model ON proposal_params.cost_model_id = cost_model.id
     LEFT JOIN off_chain_vote_data ON off_chain_vote_data.voting_anchor_id = voting_anchor.id
     LEFT JOIN off_chain_vote_gov_action_data ON off_chain_vote_gov_action_data.off_chain_vote_data_id = off_chain_vote_data.id
     LEFT JOIN voting_procedure ON voting_procedure.gov_action_proposal_id = gov_action_proposal.id
diff --git a/backend/src/types/proposal.ts b/backend/src/types/proposal.ts
index bb9e526..e854b2a 100644
--- a/backend/src/types/proposal.ts
+++ b/backend/src/types/proposal.ts
@@ -44,7 +44,7 @@ export type RawQueryGovernanceActionProposalType = {
   epoch_no: number;
   url: string;
   encode: string;
-  row_to_json: any;
+  proposal_params: any;
   metadata_hash: string;
   title: string | null;
   abstract: string | null;