diff --git a/activitystreams-kinds/Cargo.toml b/activitystreams-kinds/Cargo.toml
index 07b0200..b432022 100644
--- a/activitystreams-kinds/Cargo.toml
+++ b/activitystreams-kinds/Cargo.toml
@@ -13,6 +13,7 @@ edition = "2021"
 
 [dependencies]
 serde = { version = "1", features = ["derive"] }
+url = "2"
 
 [dev-dependencies]
 anyhow = "1"
diff --git a/activitystreams-kinds/src/lib.rs b/activitystreams-kinds/src/lib.rs
index e12c254..cb8cf90 100644
--- a/activitystreams-kinds/src/lib.rs
+++ b/activitystreams-kinds/src/lib.rs
@@ -2,6 +2,25 @@
 //!
 //! Enums representing typed versions of activitypub 'type' fields.
 
+use url::Url;
+
+/// Returns the `https://www.w3.org/ns/activitystreams` Url
+pub fn context() -> Url {
+    "https://www.w3.org/ns/activitystreams".parse().unwrap()
+}
+
+/// Returns the `https://www.w3.org/ns/activitystreams#Public` Url
+pub fn public() -> Url {
+    "https://www.w3.org/ns/activitystreams#Public"
+        .parse()
+        .unwrap()
+}
+
+/// Returns the `https://w3id.org/security/v1` Url
+pub fn security() -> Url {
+    "https://w3id.org/security/v1".parse().unwrap()
+}
+
 /// Generate an enum implementing serde's Serialize and Deserialize with a single variant
 ///
 /// This is useful for describing constants