diff --git a/.github/workflows/publish-protocol-core.yaml b/.github/workflows/publish-protocol-core.yaml
index 07470e4..19cbcaf 100644
--- a/.github/workflows/publish-protocol-core.yaml
+++ b/.github/workflows/publish-protocol-core.yaml
@@ -114,87 +114,21 @@ jobs:
           fi
           echo "Build validation passed"
 
-      - name: Upload build artifact
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
-        with:
-          name: protocol-core-build
-          path: packages/protocol-core/dist/
-          retention-days: 7
-
   # ============================================
-  # JOB 3: Version Bump (if manual trigger)
-  # ============================================
-  version-bump:
-    name: Version Bump
-    runs-on: ubuntu-latest
-    needs: build-and-test
-    if: github.event_name == 'workflow_dispatch' && !inputs.dry_run
-    timeout-minutes: 5
-    permissions:
-      contents: write
-
-    outputs:
-      new_version: ${{ steps.bump.outputs.new_version }}
-
-    steps:
-      - name: Verify branch is main
-        run: |
-          if [ "${{ github.ref }}" != "refs/heads/main" ]; then
-            echo "Error: Can only publish from main branch"
-            exit 1
-          fi
-
-      - name: Checkout repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          fetch-depth: 0
-
-      - name: Install pnpm
-        uses: pnpm/action-setup@b307475762933b98ed359c036b0e51f26b63b74b # v5.0.0
-        with:
-          version: 9
-
-      - name: Setup Node.js
-        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
-        with:
-          node-version: '20'
-
-      - name: Configure Git
-        run: |
-          git config user.name "quickswap-bot"
-          git config user.email "bot@quickswap.exchange"
-
-      - name: Bump version
-        id: bump
-        run: |
-          cd packages/protocol-core
-          echo "Current version: $(node -p "require('./package.json').version")"
-          pnpm version ${{ inputs.bump }} --no-git-tag-version --no-commit-hooks
-          NEW_VERSION=$(node -p "require('./package.json').version")
-          echo "new_version=$NEW_VERSION" >> $GITHUB_OUTPUT
-          echo "Version bumped to: $NEW_VERSION"
-
-      - name: Commit and push version
-        run: |
-          git add packages/protocol-core/package.json
-          git diff --staged --quiet || git commit -m "chore(release): protocol-core v$(cd packages/protocol-core && node -p "require('./package.json').version") [skip ci]"
-          git tag "protocol-core/v$(cd packages/protocol-core && node -p "require('./package.json').version")"
-          git push origin HEAD --follow-tags
-
-  # ============================================
-  # JOB 4: Publish to NPM (Secure OIDC)
+  # JOB 3: Publish to NPM (Secure OIDC)
+  # Atomic: bump → build → publish → commit
+  # Version is only committed AFTER successful publish
   # ============================================
   publish-npm:
     name: Publish to NPM
     runs-on: ubuntu-latest
-    needs: [build-and-test, version-bump]
+    needs: build-and-test
     if: |
-      always() &&
+      !cancelled() &&
       needs.build-and-test.result == 'success' &&
       (
         (github.event_name == 'push' && startsWith(github.ref, 'refs/tags/protocol-core/v')) ||
-        (github.event_name == 'workflow_dispatch' && !inputs.dry_run && needs.version-bump.result == 'success')
+        (github.event_name == 'workflow_dispatch' && !inputs.dry_run)
       )
     timeout-minutes: 10
     permissions:
@@ -206,15 +140,20 @@ jobs:
       url: https://www.npmjs.com/package/@quickswap-defi/protocol-core
 
     steps:
+      - name: Verify branch is main
+        if: github.event_name == 'workflow_dispatch'
+        run: |
+          if [ "${{ github.ref }}" != "refs/heads/main" ]; then
+            echo "Error: Can only publish from main branch"
+            exit 1
+          fi
+
       - name: Checkout repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
+          token: ${{ secrets.GITHUB_TOKEN }}
           fetch-depth: 0
 
-      - name: Fetch version bump
-        if: github.event_name == 'workflow_dispatch'
-        run: git fetch origin --tags
-
       - name: Verify tag is on main branch
         if: github.event_name == 'push'
         run: |
@@ -243,6 +182,19 @@ jobs:
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
+      # --- Version bump (local only, NOT committed yet) ---
+      - name: Bump version locally
+        if: github.event_name == 'workflow_dispatch'
+        id: bump
+        run: |
+          cd packages/protocol-core
+          echo "Current version: $(node -p "require('./package.json').version")"
+          pnpm version ${{ inputs.bump }} --no-git-tag-version --no-commit-hooks
+          NEW_VERSION=$(node -p "require('./package.json').version")
+          echo "new_version=$NEW_VERSION" >> $GITHUB_OUTPUT
+          echo "Version bumped to: $NEW_VERSION (local only, not committed)"
+
+      # --- Build and publish ---
       - name: Build package
         run: pnpm --filter @quickswap-defi/protocol-core build
 
@@ -251,8 +203,6 @@ jobs:
           cd packages/protocol-core
           echo "Package details:"
           npm pack --dry-run
-          echo ""
-          npm publish --dry-run
 
       - name: Check if version already exists
         id: check_version
@@ -277,6 +227,22 @@ jobs:
         run: |
           echo "Skipping: version ${{ steps.check_version.outputs.version }} already exists"
 
+      # --- Only after successful publish: commit version bump ---
+      - name: Configure Git
+        if: github.event_name == 'workflow_dispatch' && steps.check_version.outputs.exists == 'false'
+        run: |
+          git config user.name "quickswap-bot"
+          git config user.email "bot@quickswap.exchange"
+
+      - name: Commit and push version
+        if: github.event_name == 'workflow_dispatch' && steps.check_version.outputs.exists == 'false'
+        run: |
+          VERSION=$(cd packages/protocol-core && node -p "require('./package.json').version")
+          git add packages/protocol-core/package.json
+          git commit -m "chore(release): protocol-core v${VERSION} [skip ci]"
+          git tag "protocol-core/v${VERSION}"
+          git push origin HEAD --follow-tags
+
       - name: Get published version
         id: version
         run: |
@@ -284,6 +250,7 @@ jobs:
           echo "version=$VERSION" >> $GITHUB_OUTPUT
 
       - name: Create GitHub Release
+        if: steps.check_version.outputs.exists == 'false'
         env:
           GH_TOKEN: ${{ github.token }}
         run: |
@@ -300,7 +267,7 @@ jobs:
             ${{ contains(steps.version.outputs.version, '-') && '--prerelease' || '' }}
 
   # ============================================
-  # JOB 5: Post-Publish Verification
+  # JOB 4: Post-Publish Verification
   # ============================================
   verify-publish:
     name: Verify Publication
diff --git a/.github/workflows/publish-sdk.yaml b/.github/workflows/publish-sdk.yaml
index 7d8d2de..560038f 100644
--- a/.github/workflows/publish-sdk.yaml
+++ b/.github/workflows/publish-sdk.yaml
@@ -111,87 +111,21 @@ jobs:
           fi
           echo "Build validation passed"
 
-      - name: Upload build artifact
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
-        with:
-          name: sdk-build
-          path: packages/sdk/dist/
-          retention-days: 7
-
   # ============================================
-  # JOB 3: Version Bump (if manual trigger)
-  # ============================================
-  version-bump:
-    name: Version Bump
-    runs-on: ubuntu-latest
-    needs: build-and-test
-    if: github.event_name == 'workflow_dispatch' && !inputs.dry_run
-    timeout-minutes: 5
-    permissions:
-      contents: write
-
-    outputs:
-      new_version: ${{ steps.bump.outputs.new_version }}
-
-    steps:
-      - name: Verify branch is main
-        run: |
-          if [ "${{ github.ref }}" != "refs/heads/main" ]; then
-            echo "Error: Can only publish from main branch"
-            exit 1
-          fi
-
-      - name: Checkout repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          fetch-depth: 0
-
-      - name: Install pnpm
-        uses: pnpm/action-setup@b307475762933b98ed359c036b0e51f26b63b74b # v5.0.0
-        with:
-          version: 9
-
-      - name: Setup Node.js
-        uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
-        with:
-          node-version: '20'
-
-      - name: Configure Git
-        run: |
-          git config user.name "quickswap-bot"
-          git config user.email "bot@quickswap.exchange"
-
-      - name: Bump version
-        id: bump
-        run: |
-          cd packages/sdk
-          echo "Current version: $(node -p "require('./package.json').version")"
-          pnpm version ${{ inputs.bump }} --no-git-tag-version --no-commit-hooks
-          NEW_VERSION=$(node -p "require('./package.json').version")
-          echo "new_version=$NEW_VERSION" >> $GITHUB_OUTPUT
-          echo "Version bumped to: $NEW_VERSION"
-
-      - name: Commit and push version
-        run: |
-          git add packages/sdk/package.json
-          git diff --staged --quiet || git commit -m "chore(release): sdk v$(cd packages/sdk && node -p "require('./package.json').version") [skip ci]"
-          git tag "sdk/v$(cd packages/sdk && node -p "require('./package.json').version")"
-          git push origin HEAD --follow-tags
-
-  # ============================================
-  # JOB 4: Publish to NPM (Secure OIDC)
+  # JOB 3: Publish to NPM (Secure OIDC)
+  # Atomic: bump → build → publish → commit
+  # Version is only committed AFTER successful publish
   # ============================================
   publish-npm:
     name: Publish to NPM
     runs-on: ubuntu-latest
-    needs: [build-and-test, version-bump]
+    needs: build-and-test
     if: |
-      always() &&
+      !cancelled() &&
       needs.build-and-test.result == 'success' &&
       (
         (github.event_name == 'push' && startsWith(github.ref, 'refs/tags/sdk/v')) ||
-        (github.event_name == 'workflow_dispatch' && !inputs.dry_run && needs.version-bump.result == 'success')
+        (github.event_name == 'workflow_dispatch' && !inputs.dry_run)
       )
     timeout-minutes: 10
     permissions:
@@ -203,15 +137,20 @@ jobs:
       url: https://www.npmjs.com/package/@quickswap-defi/sdk
 
     steps:
+      - name: Verify branch is main
+        if: github.event_name == 'workflow_dispatch'
+        run: |
+          if [ "${{ github.ref }}" != "refs/heads/main" ]; then
+            echo "Error: Can only publish from main branch"
+            exit 1
+          fi
+
       - name: Checkout repository
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
+          token: ${{ secrets.GITHUB_TOKEN }}
           fetch-depth: 0
 
-      - name: Fetch version bump
-        if: github.event_name == 'workflow_dispatch'
-        run: git fetch origin --tags
-
       - name: Verify tag is on main branch
         if: github.event_name == 'push'
         run: |
@@ -240,6 +179,19 @@ jobs:
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
+      # --- Version bump (local only, NOT committed yet) ---
+      - name: Bump version locally
+        if: github.event_name == 'workflow_dispatch'
+        id: bump
+        run: |
+          cd packages/sdk
+          echo "Current version: $(node -p "require('./package.json').version")"
+          pnpm version ${{ inputs.bump }} --no-git-tag-version --no-commit-hooks
+          NEW_VERSION=$(node -p "require('./package.json').version")
+          echo "new_version=$NEW_VERSION" >> $GITHUB_OUTPUT
+          echo "Version bumped to: $NEW_VERSION (local only, not committed)"
+
+      # --- Build and publish ---
       - name: Build package
         run: pnpm --filter @quickswap-defi/sdk build
 
@@ -248,8 +200,6 @@ jobs:
           cd packages/sdk
           echo "Package details:"
           npm pack --dry-run
-          echo ""
-          npm publish --dry-run
 
       - name: Check if version already exists
         id: check_version
@@ -274,6 +224,22 @@ jobs:
         run: |
           echo "Skipping: version ${{ steps.check_version.outputs.version }} already exists"
 
+      # --- Only after successful publish: commit version bump ---
+      - name: Configure Git
+        if: github.event_name == 'workflow_dispatch' && steps.check_version.outputs.exists == 'false'
+        run: |
+          git config user.name "quickswap-bot"
+          git config user.email "bot@quickswap.exchange"
+
+      - name: Commit and push version
+        if: github.event_name == 'workflow_dispatch' && steps.check_version.outputs.exists == 'false'
+        run: |
+          VERSION=$(cd packages/sdk && node -p "require('./package.json').version")
+          git add packages/sdk/package.json
+          git commit -m "chore(release): sdk v${VERSION} [skip ci]"
+          git tag "sdk/v${VERSION}"
+          git push origin HEAD --follow-tags
+
       - name: Get published version
         id: version
         run: |
@@ -281,6 +247,7 @@ jobs:
           echo "version=$VERSION" >> $GITHUB_OUTPUT
 
       - name: Create GitHub Release
+        if: steps.check_version.outputs.exists == 'false'
         env:
           GH_TOKEN: ${{ github.token }}
         run: |
@@ -297,7 +264,7 @@ jobs:
             ${{ contains(steps.version.outputs.version, '-') && '--prerelease' || '' }}
 
   # ============================================
-  # JOB 5: Post-Publish Verification
+  # JOB 4: Post-Publish Verification
   # ============================================
   verify-publish:
     name: Verify Publication
diff --git a/packages/protocol-core/package.json b/packages/protocol-core/package.json
index 083ece2..0cc39d0 100644
--- a/packages/protocol-core/package.json
+++ b/packages/protocol-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@quickswap-defi/protocol-core",
-  "version": "2.0.1",
+  "version": "0.1.0",
   "license": "MIT",
   "description": "Pure protocol knowledge for QuickSwap DEX — chains, stablecoins, fees, schema detection",
   "repository": {
diff --git a/packages/sdk/test/fraction.test.ts b/packages/sdk/test/fraction.test.ts
index 1a36ca7..698024d 100755
--- a/packages/sdk/test/fraction.test.ts
+++ b/packages/sdk/test/fraction.test.ts
@@ -1,7 +1,7 @@
 import { Fraction } from '../src'
 import JSBI from 'jsbi'
 
-describe.only('Fraction', () => {
+describe('Fraction', () => {
   describe('#quotient', () => {
     it('floor division', () => {
       expect(new Fraction(JSBI.BigInt(8), JSBI.BigInt(3)).quotient).toEqual(JSBI.BigInt(2)) // one below