diff --git a/CHANGELOG.md b/CHANGELOG.md
index 094c42d..6651cb5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,15 @@
 All notable changes to the `cryptohopper` gem are documented in this file.
 The format is loosely based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
-## 0.1.0.pre.alpha.1 — Unreleased
+## 0.1.0.pre.alpha.2 — Unreleased
+
+### Fixed
+- **Critical: every authenticated request was rejected by the API gateway.** The transport sent `Authorization: Bearer <token>`, which the AWS API Gateway in front of `api.cryptohopper.com/v1/*` rejects (`405 Missing Authentication Token`). Cryptohopper's Public API v1 uses `access-token: <token>` — confirmed by the official [API documentation](https://www.cryptohopper.com/api-documentation/how-the-api-works) and the legacy iOS/Android SDKs. Switching to send `access-token`. The `Authorization` header is no longer set.
+
+### Compatibility
+No public-API change. `client.user.get`, `client.hoppers.list`, etc. keep their signatures.
+
+## 0.1.0.pre.alpha.1 — 2026-04-24
 
 Initial release. Launches at full surface parity with the other SDKs at 0.4.0 — all 18 public API domains from day one.
 
diff --git a/README.md b/README.md
index 33111b0..5fe513c 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ ch.hoppers.buy(hopper_id: 42, market: "BTC/USDT", amount: 0.001)
 ch.hoppers.config_update(42, strategy_id: 99)
 ch.hoppers.panic(42)
 
-# Exchange (public, no auth)
+# Exchange — market data (still requires a real token; the gateway has no anonymous routes)
 ch.exchange.ticker(exchange: "binance", market: "BTC/USDT")
 ch.exchange.candles(exchange: "binance", market: "BTC/USDT", timeframe: "1h")
 
diff --git a/lib/cryptohopper/client.rb b/lib/cryptohopper/client.rb
index ca50bdd..03d4086 100644
--- a/lib/cryptohopper/client.rb
+++ b/lib/cryptohopper/client.rb
@@ -136,7 +136,10 @@ def build_request(method, uri, body)
               end
 
       req = klass.new(uri.request_uri)
-      req["Authorization"] = "Bearer #{@api_key}"
+      # Cryptohopper Public API v1 uses `access-token: <token>`, not the
+      # OAuth2-conventional `Authorization: Bearer <token>`. The gateway
+      # in front of the API rejects Bearer with a SigV4 parse error.
+      req["access-token"] = @api_key
       req["Accept"] = "application/json"
       req["User-Agent"] = user_agent_header
       # Ruby treats empty strings as truthy, so a literal `if @app_key`
diff --git a/lib/cryptohopper/version.rb b/lib/cryptohopper/version.rb
index ac1603e..1a28c4d 100644
--- a/lib/cryptohopper/version.rb
+++ b/lib/cryptohopper/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Cryptohopper
-  VERSION = "0.1.0.pre.alpha.1"
+  VERSION = "0.1.0.pre.alpha.2"
 end
diff --git a/spec/cryptohopper/client_spec.rb b/spec/cryptohopper/client_spec.rb
index bcadfcb..9433fc9 100644
--- a/spec/cryptohopper/client_spec.rb
+++ b/spec/cryptohopper/client_spec.rb
@@ -23,11 +23,11 @@ def build_client(**opts)
   end
 
   describe "transport" do
-    it "sends Authorization + User-Agent headers and unwraps {data}" do
+    it "sends access-token + User-Agent headers and unwraps {data}" do
       stub_request(:get, "https://api.cryptohopper.com/v1/user/get")
         .with(
           headers: {
-            "Authorization" => "Bearer ch_test",
+            "access-token" => "ch_test",
             "Accept" => "application/json",
             "User-Agent" => "cryptohopper-sdk-ruby/#{Cryptohopper::VERSION}"
           }
@@ -39,6 +39,16 @@ def build_client(**opts)
       expect(out).to eq({ "hello" => "world" })
     end
 
+    it "does not send an Authorization header" do
+      stub_request(:get, "https://api.cryptohopper.com/v1/user/get")
+        .to_return(status: 200, body: '{"data":{}}')
+      build_client.send(:_request, "GET", "/user/get")
+      expect(WebMock).to(
+        have_requested(:get, "https://api.cryptohopper.com/v1/user/get")
+          .with { |req| req.headers["Authorization"].nil? }
+      )
+    end
+
     it "sends x-api-app-key when app_key is provided" do
       stub_request(:get, "https://api.cryptohopper.com/v1/user/get")
         .with(headers: { "x-api-app-key" => "client_123" })