diff --git a/hkp-java/src/main/kotlin/pgp/hkp/HKPApi.kt b/hkp-java/src/main/kotlin/pgp/hkp/HKPApi.kt
new file mode 100644
index 0000000..a2489f5
--- /dev/null
+++ b/hkp-java/src/main/kotlin/pgp/hkp/HKPApi.kt
@@ -0,0 +1,28 @@
+package pgp.hkp
+
+import pgp.hkp.operation.Get
+import java.net.http.HttpClient
+
+
+open class HKPApi(
+    val http: HttpClient,
+    val service: HKPServerInfo,
+    val openpgp: OpenPgpImplementation
+) {
+    companion object {
+        const val REQUEST_PATH_PREFIX = "/pks"
+        const val REQUEST_PATH_LOOKUP = "${Companion.REQUEST_PATH_PREFIX}/lookup"
+        const val REQUEST_PATH_ADD = "${Companion.REQUEST_PATH_PREFIX}/add"
+
+        const val VAR_OP = "op"
+        const val VAR_SEARCH = "search"
+
+        const val OP_GET = "get"
+        const val OP_INDEX = "index"
+        const val OP_VINDEX = "vindex"
+        const val OP_STATS = "stats"
+        const val OP_HGET = "hget"
+    }
+
+    fun get() = Get(http, service, openpgp)
+}
\ No newline at end of file
diff --git a/hkp-java/src/main/kotlin/pgp/hkp/HKPServerInfo.kt b/hkp-java/src/main/kotlin/pgp/hkp/HKPServerInfo.kt
new file mode 100644
index 0000000..348ee6b
--- /dev/null
+++ b/hkp-java/src/main/kotlin/pgp/hkp/HKPServerInfo.kt
@@ -0,0 +1,8 @@
+package pgp.hkp
+
+import java.net.URI
+
+data class HKPServerInfo(
+    val serviceUri: URI,
+) {
+}
\ No newline at end of file
diff --git a/hkp-java/src/main/kotlin/pgp/hkp/HockeypuckApi.kt b/hkp-java/src/main/kotlin/pgp/hkp/HockeypuckApi.kt
new file mode 100644
index 0000000..8a2494e
--- /dev/null
+++ b/hkp-java/src/main/kotlin/pgp/hkp/HockeypuckApi.kt
@@ -0,0 +1,14 @@
+package pgp.hkp
+
+import java.net.http.HttpClient
+
+class HockeypuckApi(
+    http: HttpClient,
+    service: HKPServerInfo,
+    openpgp: OpenPgpImplementation
+) : HKPApi(http, service, openpgp) {
+    companion object {
+        const val REQUEST_PATH_DELETE = "$REQUEST_PATH_PREFIX/delete"
+        const val REQUEST_PATH_REPLACE = "$REQUEST_PATH_PREFIX/replace"
+    }
+}
\ No newline at end of file
diff --git a/hkp-java/src/main/kotlin/pgp/hkp/OpenPgpImplementation.kt b/hkp-java/src/main/kotlin/pgp/hkp/OpenPgpImplementation.kt
new file mode 100644
index 0000000..17f8f3d
--- /dev/null
+++ b/hkp-java/src/main/kotlin/pgp/hkp/OpenPgpImplementation.kt
@@ -0,0 +1,8 @@
+package pgp.hkp
+
+abstract class OpenPgpImplementation {
+
+    abstract fun hexKeyId(keyId: Long): CharSequence
+
+    abstract fun hexFingerprint(fingerprint: ByteArray): CharSequence
+}
\ No newline at end of file
diff --git a/hkp-java/src/main/kotlin/pgp/hkp/SKSApi.kt b/hkp-java/src/main/kotlin/pgp/hkp/SKSApi.kt
new file mode 100644
index 0000000..b46e2ef
--- /dev/null
+++ b/hkp-java/src/main/kotlin/pgp/hkp/SKSApi.kt
@@ -0,0 +1,13 @@
+package pgp.hkp
+
+import java.net.http.HttpClient
+
+class SKSApi(
+    http: HttpClient,
+    service: HKPServerInfo,
+    openpgp: OpenPgpImplementation
+) : HKPApi(http, service, openpgp) {
+    companion object {
+        const val REQUEST_PATH_HASHQUERY = "$REQUEST_PATH_PREFIX/hashquery"
+    }
+}
\ No newline at end of file
diff --git a/hkp-java/src/main/kotlin/pgp/hkp/operation/Get.kt b/hkp-java/src/main/kotlin/pgp/hkp/operation/Get.kt
new file mode 100644
index 0000000..ce3e91a
--- /dev/null
+++ b/hkp-java/src/main/kotlin/pgp/hkp/operation/Get.kt
@@ -0,0 +1,30 @@
+package pgp.hkp.operation
+
+import pgp.hkp.HKPApi.Companion.OP_GET
+import pgp.hkp.HKPServerInfo
+import pgp.hkp.OpenPgpImplementation
+import java.net.http.HttpClient
+
+class Get(val http: HttpClient,
+          val service: HKPServerInfo,
+          val openpgp: OpenPgpImplementation) {
+
+    fun byKeyId(keyId: Long): LookupRequest {
+        return LookupRequest(http, service, OP_GET, "0x${openpgp.hexKeyId(keyId)}")
+    }
+
+    fun byFingerprint(fingerprint: ByteArray): LookupRequest {
+        return byFingerprint(openpgp.hexFingerprint(fingerprint))
+    }
+
+    fun byFingerprint(fingerprint: CharSequence): LookupRequest {
+        require(fingerprint.length in listOf(32, 40, 64)) {
+            "Fingerprint strings are either 32 (v3), 40 (v4) or 64 (v6) hexadecimal digits."
+        }
+        return LookupRequest(http, service, OP_GET, "0x$fingerprint")
+    }
+
+    fun byUserId(userId: CharSequence): LookupRequest {
+        return LookupRequest(http, service, OP_GET, userId.toString())
+    }
+}
\ No newline at end of file
diff --git a/hkp-java/src/main/kotlin/pgp/hkp/operation/LookupRequest.kt b/hkp-java/src/main/kotlin/pgp/hkp/operation/LookupRequest.kt
new file mode 100644
index 0000000..5d7a6e8
--- /dev/null
+++ b/hkp-java/src/main/kotlin/pgp/hkp/operation/LookupRequest.kt
@@ -0,0 +1,34 @@
+package pgp.hkp.operation
+
+import pgp.hkp.HKPApi.Companion.REQUEST_PATH_LOOKUP
+import pgp.hkp.HKPApi.Companion.VAR_OP
+import pgp.hkp.HKPApi.Companion.VAR_SEARCH
+import pgp.hkp.HKPServerInfo
+import java.net.URI
+import java.net.http.HttpClient
+import java.net.http.HttpRequest
+import java.net.http.HttpResponse
+import java.net.http.HttpResponse.BodySubscribers
+
+class LookupRequest(
+    val http: HttpClient,
+    val service: HKPServerInfo,
+    val op: CharSequence,
+    val search: CharSequence
+) {
+
+    val path: CharSequence
+        get() = "$REQUEST_PATH_LOOKUP?search=$search&op=$op"
+
+    fun execute() {
+        val request = HttpRequest.newBuilder(URIBuilder()URI.create("${service.serviceUri}$REQUEST_PATH_LOOKUP"))
+            .GET()
+            .(VAR_SEARCH, search.toString())
+            .header(VAR_OP, op.toString())
+            .build()
+
+        println(request.toString())
+
+        http.send(request, HttpResponse.BodyHandler {it -> BodySubscribers.ofByteArray()})
+    }
+}
\ No newline at end of file
diff --git a/hkp-java/src/test/kotlin/pgp/hkp/HKPApiTest.kt b/hkp-java/src/test/kotlin/pgp/hkp/HKPApiTest.kt
new file mode 100644
index 0000000..f73763d
--- /dev/null
+++ b/hkp-java/src/test/kotlin/pgp/hkp/HKPApiTest.kt
@@ -0,0 +1,27 @@
+package pgp.hkp
+
+import org.junit.jupiter.api.Test
+import java.net.URI
+import java.net.http.HttpClient
+import java.util.HexFormat
+
+class HKPApiTest {
+
+    @Test
+    fun test() {
+        val api = HKPApi(HttpClient.newHttpClient(),
+            HKPServerInfo(URI.create("http://keys.example.com:11371")),
+            object : OpenPgpImplementation() {
+                override fun hexKeyId(keyId: Long): CharSequence {
+                    return keyId.toString(16)
+                }
+
+                override fun hexFingerprint(fingerprint: ByteArray): CharSequence {
+                    return HexFormat.of().formatHex(fingerprint)
+                }
+            }
+        )
+
+        api.get().byUserId("Alice").execute()
+    }
+}
\ No newline at end of file