diff --git a/Cargo.lock b/Cargo.lock
index 22d5dcf..7f829bf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -625,6 +625,7 @@ version = "0.1.0"
 dependencies = [
  "base64 0.21.0",
  "base64-serde",
+ "chrono",
  "log",
  "rand",
  "reqwest",
diff --git a/dnapi-rs/Cargo.toml b/dnapi-rs/Cargo.toml
index 87b08d6..682e4e6 100644
--- a/dnapi-rs/Cargo.toml
+++ b/dnapi-rs/Cargo.toml
@@ -20,4 +20,10 @@ url = "2.3.1"
 base64 = "0.21.0"
 serde_json = "1.0.95"
 trifid-pki = { version = "0.1.6", path = "../trifid-pki" }
-rand = "0.8.5"
\ No newline at end of file
+rand = "0.8.5"
+chrono = "0.4.24"
+
+[features]
+default = ["blocking"]
+blocking = ["reqwest/blocking"]
+async = []
\ No newline at end of file
diff --git a/dnapi-rs/src/client.rs b/dnapi-rs/src/client.rs
deleted file mode 100644
index 4dc1f83..0000000
--- a/dnapi-rs/src/client.rs
+++ /dev/null
@@ -1 +0,0 @@
-//! Client structs to handle communication with the Defined Networking API.
\ No newline at end of file
diff --git a/dnapi-rs/src/client_async.rs b/dnapi-rs/src/client_async.rs
new file mode 100644
index 0000000..e69de29
diff --git a/dnapi-rs/src/client_blocking.rs b/dnapi-rs/src/client_blocking.rs
new file mode 100644
index 0000000..780cc32
--- /dev/null
+++ b/dnapi-rs/src/client_blocking.rs
@@ -0,0 +1,102 @@
+//! Client structs to handle communication with the Defined Networking API. This is the blocking client API - if you want async instead, set no-default-features and enable the async feature instead.
+
+use std::error::Error;
+use chrono::Local;
+use log::{debug, error};
+use url::Url;
+use trifid_pki::cert::serialize_ed25519_public;
+use crate::credentials::{Credentials, ed25519_public_keys_from_pem};
+use crate::crypto::new_keys;
+use crate::message::{ENROLL_ENDPOINT, EnrollRequest, EnrollResponse};
+
+/// A type alias to abstract return types
+pub type NebulaConfig = Vec<u8>;
+
+/// A type alias to abstract DH private keys
+pub type DHPrivateKeyPEM = Vec<u8>;
+
+/// A combination of persistent data and HTTP client used for communicating with the API.
+pub struct Client {
+    http_client: reqwest::blocking::Client,
+    server_url: Url
+}
+
+/// A struct containing organization metadata returned as a result of enrollment
+pub struct EnrollMeta {
+    /// The server organization ID this node is now a member of
+    pub organization_id: String,
+    /// The server organization name this node is now a member of
+    pub organization_name: String
+}
+
+impl Client {
+    /// Create a new `Client` configured with the given User-Agent and API base.
+    /// # Errors
+    /// This function will return an error if the reqwest Client could not be created.
+    pub fn new(user_agent: String, api_base: Url) -> Result<Self, Box<dyn Error>> {
+        let client = reqwest::blocking::Client::builder().user_agent(user_agent).build()?;
+        Ok(Self {
+            http_client: client,
+            server_url: api_base
+        })
+    }
+
+    /// Issues an enrollment request against the REST API using the given enrollment code, passing along a
+    /// locally generated DH X25519 Nebula key to be signed by the CA, and an Ed25519 key for future API
+    /// authentication. On success it returns the Nebula config generated by the server, a Nebula private key PEM,
+    /// credentials to be used for future DN API requests, and an object containing organization information.
+    /// # Errors
+    /// This function will return an error in any of the following situations:
+    /// - the server_url is invalid
+    /// - the HTTP request fails
+    /// - the HTTP response is missing X-Request-ID
+    /// - X-Request-ID isn't valid UTF-8
+    /// - the server returns an error
+    /// - the server returns invalid JSON
+    /// - the `trusted_keys` field is invalid
+    pub fn enroll(&self, code: &str) -> Result<(NebulaConfig, DHPrivateKeyPEM, Credentials, EnrollMeta), Box<dyn Error>> {
+        debug!("making enrollment request to API {{server: {}, code: {}}}", self.server_url, code);
+
+        let (dh_pubkey_pem, dh_privkey_pem, ed_pubkey, ed_privkey) = new_keys();
+
+        let req_json = serde_json::to_string(&EnrollRequest {
+            code: code.to_string(),
+            dh_pubkey: dh_pubkey_pem,
+            ed_pubkey: serialize_ed25519_public(ed_pubkey.as_bytes()),
+            timestamp: Local::now().format("%Y-%m-%dT%H:%M:%S.%f%:z").to_string(),
+        })?;
+
+        let resp = self.http_client.post(self.server_url.join(ENROLL_ENDPOINT)?).body(req_json).send()?;
+
+        let req_id = resp.headers().get("X-Request-ID").ok_or("Response missing X-Request-ID")?.to_str()?;
+        debug!("enrollment request complete {{req_id: {}}}", req_id);
+
+        let resp: EnrollResponse = resp.json()?;
+
+        let r = match resp {
+            EnrollResponse::Success { data } => data,
+            EnrollResponse::Error { errors } => {
+                error!("unexpected error during enrollment: {}", errors[0].message);
+                return Err(errors[0].message.clone().into());
+            }
+        };
+
+        let meta = EnrollMeta {
+            organization_id: r.organization.id,
+            organization_name: r.organization.name,
+        };
+
+        let trusted_keys = ed25519_public_keys_from_pem(&r.trusted_keys)?;
+
+        let creds = Credentials {
+            host_id: r.host_id,
+            ed_privkey,
+            counter: r.counter,
+            trusted_keys,
+        };
+
+        Ok((r.config, dh_privkey_pem, creds, meta))
+    }
+
+
+}
\ No newline at end of file
diff --git a/dnapi-rs/src/lib.rs b/dnapi-rs/src/lib.rs
index 8603e30..1317543 100644
--- a/dnapi-rs/src/lib.rs
+++ b/dnapi-rs/src/lib.rs
@@ -15,7 +15,18 @@
 #![allow(clippy::too_many_lines)]
 #![allow(clippy::module_name_repetitions)]
 
+#[cfg(all(feature = "blocking", feature = "async"))]
+compile_error!("Cannot compile with both blocking and async features at the same time. Please pick one or the other.");
+
 pub mod message;
+
+#[cfg(feature = "blocking")]
+#[path = "client_blocking.rs"]
 pub mod client;
+
+#[cfg(feature = "async")]
+#[path = "client_async.rs"]
+pub mod client;
+
 pub mod credentials;
 pub mod crypto;
\ No newline at end of file
diff --git a/dnapi-rs/src/message.rs b/dnapi-rs/src/message.rs
index e52140e..31f4a29 100644
--- a/dnapi-rs/src/message.rs
+++ b/dnapi-rs/src/message.rs
@@ -4,7 +4,7 @@ use base64_serde::base64_serde_type;
 use serde::{Serialize, Deserialize};
 
 /// The version 1 `DNClient` API endpoint
-const ENDPOINT_V1: &str = "/v1/dnclient";
+pub const ENDPOINT_V1: &str = "/v1/dnclient";
 
 base64_serde_type!(Base64Standard, base64::engine::general_purpose::STANDARD);
 
@@ -114,7 +114,7 @@ pub struct DoUpdateResponse {
 }
 
 /// The REST enrollment endpoint
-const ENROLL_ENDPOINT: &str = "/v2/enroll";
+pub const ENROLL_ENDPOINT: &str = "/v2/enroll";
 
 #[derive(Serialize, Deserialize)]
 /// `EnrollRequest` is issued to the `ENROLL_ENDPOINT` to enroll this `dnclient` with a dnapi organization