diff --git a/.github/workflows/pr-checks.yml b/.github/workflows/pr-checks.yml
new file mode 100644
index 0000000..5a05701
--- /dev/null
+++ b/.github/workflows/pr-checks.yml
@@ -0,0 +1,56 @@
+name: Pull Request Checks
+
+on:
+  pull_request:
+    branches:
+      - main
+    types: [opened, synchronize, reopened]
+    paths-ignore:
+      - 'docs/**'
+      - '*.md'
+      - 'README.md'
+
+jobs:
+  test_and_check_version:
+    name: Test and Check Version
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out base branch
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.base_ref }}
+          path: 'main'
+
+      - name: Check out PR branch
+        uses: actions/checkout@v4
+        with:
+          path: 'pr'
+
+      - name: Check for version increment
+        id: check_version
+        run: |
+          # Install jq, a tool for parsing JSON
+          sudo apt-get update && sudo apt-get install -y jq
+
+          # Extract version from the main branch's package.json
+          main_version=$(jq -r .version main/package.json)
+          echo "Version on main: $main_version"
+
+          # Extract version from the PR branch's package.json
+          pr_version=$(jq -r .version pr/package.json)
+          echo "Version on PR branch: $pr_version"
+
+          if [ "$main_version" == "$pr_version" ]; then
+            echo "Version has not been incremented from main."
+            exit 1
+          fi
+
+          # The `sort -V` command handles version numbers correctly.
+          # It understands that 0.1.10 is greater than 0.1.9.
+          if [ "$(printf '%s\n' "$main_version" "$pr_version" | sort -V | head -n1)" != "$main_version" ]; then
+             echo "PR version ($pr_version) is not greater than main version ($main_version)."
+             exit 1
+          fi
+
+          echo "Version check passed!"
diff --git a/package.json b/package.json
index 40ebe7a..e8ab64f 100644
--- a/package.json
+++ b/package.json
@@ -43,5 +43,5 @@
     "dev": "tsx watch src/index.ts",
     "format": "biome format --write"
   },
-  "version": "0.0.6"
+  "version": "0.0.7"
 }
diff --git a/src/overmind-client.ts b/src/overmind-client.ts
index 70f58f0..859c234 100644
--- a/src/overmind-client.ts
+++ b/src/overmind-client.ts
@@ -27,6 +27,10 @@ type OvermindClientConfig = {
   appName?: string;
 };
 
+const LOCAL_API_KEY_PREFIX = "ovr_core_";
+const LOCAL_BASE_URL = "http://localhost:8000";
+const DEFAULT_BASE_URL = "https://api.overmindlab.ai";
+
 export class OvermindClient {
   public readonly appName: string;
   private version: string = version;
@@ -36,14 +40,16 @@ export class OvermindClient {
   public experimentSlug?: string;
 
   constructor(config: OvermindClientConfig) {
+    // biome-ignore lint/style/noNonNullAssertion: must always set api key
+    this.apiKey = config.apiKey || process.env.OVERMIND_API_KEY!;
+
     this.baseUrl =
       config.baseUrl ||
       process.env.OVERMIND_API_URL ||
       process.env.OVERMIND_TRACES_URL ||
-      "https://api.overmindlab.ai";
-
-    // biome-ignore lint/style/noNonNullAssertion: must always set api key
-    this.apiKey = config.apiKey || process.env.OVERMIND_API_KEY!;
+      this.apiKey.startsWith(LOCAL_API_KEY_PREFIX)
+        ? LOCAL_BASE_URL
+        : DEFAULT_BASE_URL;
 
     this.appName = config.appName || "overmind-js";
     if (!this.apiKey) {
@@ -73,7 +79,7 @@ export class OvermindClient {
     const traceExporter = this.baseUrl
       ? new OTLPTraceExporter({
           headers: { "X-API-TOKEN": this.apiKey },
-          url: `${this.baseUrl}/api/v1/traces/create`,
+          url: `${this.baseUrl}/api/v1/traces`,
         })
       : new ConsoleSpanExporter();