diff --git a/docs/api-reference.md b/docs/api-reference.md
index 89fa309..00fa0b0 100644
--- a/docs/api-reference.md
+++ b/docs/api-reference.md
@@ -53,21 +53,21 @@ Example response:
   "mainnet": {
     "totalBlocks": 7000000,
     "processedBlocks": 3000000,
-    "progressPct": 42.9,
+    "historicalBlocksFetchedPct": 42.9,
     "isRealtime": false,
     "isComplete": false
   },
   "gnosis": {
     "totalBlocks": 17000000,
     "processedBlocks": 17000000,
-    "progressPct": 100.0,
+    "historicalBlocksFetchedPct": 100.0,
     "isRealtime": true,
     "isComplete": true
   }
 }
 ```
 
-- `progressPct` is rounded to one decimal place (0–100).
+- `historicalBlocksFetchedPct` is rounded to one decimal place (0–100).
 - `isRealtime` flips to `true` once the chain enters live-sync mode.
 - `isComplete` flips to `true` once all historical blocks are processed.
 - Returns `{}` if the `/metrics` endpoint is unreachable.
diff --git a/src/api/endpoints/sync-progress.ts b/src/api/endpoints/sync-progress.ts
index c72bb35..4caf985 100644
--- a/src/api/endpoints/sync-progress.ts
+++ b/src/api/endpoints/sync-progress.ts
@@ -56,7 +56,7 @@ export const syncProgressHandler: RouteHandler<typeof syncProgressRoute> =
       {
         totalBlocks: number;
         processedBlocks: number;
-        progressPct: number;
+        historicalBlocksFetchedPct: number;
         isRealtime: boolean;
         isComplete: boolean;
       }
@@ -72,7 +72,7 @@ export const syncProgressHandler: RouteHandler<typeof syncProgressRoute> =
       result[chain] = {
         totalBlocks: t,
         processedBlocks: processed,
-        progressPct: pct,
+        historicalBlocksFetchedPct: pct,
         isRealtime: (isRealtime.get(chain) ?? 0) === 1,
         isComplete: (isComplete.get(chain) ?? 0) === 1,
       };
diff --git a/src/api/routes.ts b/src/api/routes.ts
index cc7b777..8b65a80 100644
--- a/src/api/routes.ts
+++ b/src/api/routes.ts
@@ -35,7 +35,7 @@ export const syncProgressRoute = createRoute({
   tags: ["Indexer"],
   summary: "Per-chain historical sync progress",
   description:
-    "Returns the indexer's historical backfill progress per chain: total blocks to process, blocks already processed, percentage complete, and whether the chain is in realtime mode. Reads from Ponder's built-in Prometheus metrics. During initial sync, progressPct will rise from 0 to 100 and isComplete will flip to true once the chain is fully caught up.",
+    "Returns the indexer's historical backfill progress per chain: total blocks to process, blocks already processed, percentage complete, and whether the chain is in realtime mode. Reads from Ponder's built-in Prometheus metrics. During initial sync, historicalBlocksFetchedPct will rise from 0 to 100 and isComplete will flip to true once the chain is fully caught up.",
   responses: {
     200: {
       description: "Per-chain sync progress.",
diff --git a/src/api/schemas/sync-progress.ts b/src/api/schemas/sync-progress.ts
index 25f525a..fded028 100644
--- a/src/api/schemas/sync-progress.ts
+++ b/src/api/schemas/sync-progress.ts
@@ -9,7 +9,7 @@ export const ChainProgressSchema = z.object({
     .number()
     .int()
     .describe("Blocks already processed (completed + served from cache)."),
-  progressPct: z
+  historicalBlocksFetchedPct: z
     .number()
     .describe("Completion percentage (0–100). Rounded to one decimal place."),
   isRealtime: z
diff --git a/tests/api/sync-progress.test.ts b/tests/api/sync-progress.test.ts
index 87857ad..b39e401 100644
--- a/tests/api/sync-progress.test.ts
+++ b/tests/api/sync-progress.test.ts
@@ -5,7 +5,7 @@ import { syncProgressHandler } from "../../src/api/endpoints/sync-progress";
 type ChainProgress = {
   totalBlocks: number;
   processedBlocks: number;
-  progressPct: number;
+  historicalBlocksFetchedPct: number;
   isRealtime: boolean;
   isComplete: boolean;
 };
@@ -84,15 +84,15 @@ describe("GET /api/sync-progress", () => {
     expect(body["gnosis"]!.processedBlocks).toBe(2_400_000);
   });
 
-  it("computes progressPct correctly (rounded to 1 decimal)", async () => {
+  it("computes historicalBlocksFetchedPct correctly (rounded to 1 decimal)", async () => {
     mockFetch(SAMPLE_METRICS);
     const app = buildApp();
     const res = await app.request("http://localhost/api/sync-progress");
     const body = (await res.json()) as Record<string, ChainProgress>;
     // mainnet: 3_000_000 / 7_000_000 = 42.857... → 42.9
-    expect(body["mainnet"]!.progressPct).toBe(42.9);
+    expect(body["mainnet"]!.historicalBlocksFetchedPct).toBe(42.9);
     // gnosis: 2_400_000 / 17_000_000 = 14.117... → 14.1
-    expect(body["gnosis"]!.progressPct).toBe(14.1);
+    expect(body["gnosis"]!.historicalBlocksFetchedPct).toBe(14.1);
   });
 
   it("sets isRealtime and isComplete from metrics flags", async () => {