diff --git a/activitystreams/activity.go b/activitystreams/activity.go
index 915ae56..81da084 100644
--- a/activitystreams/activity.go
+++ b/activitystreams/activity.go
@@ -11,7 +11,13 @@ const (
 	toPublic  = "https://www.w3.org/ns/activitystreams#Public"
 )
 
-var Extensions = map[string]string{}
+var (
+	Extensions = map[string]string{}
+
+	apMonetizationContext = map[string]interface{}{
+		"monetization": "https://interledger.org/ns#monetization",
+	}
+)
 
 // Activity describes actions that have either already occurred, are in the
 // process of occurring, or may occur in the future.
diff --git a/activitystreams/person.go b/activitystreams/person.go
index b878d2c..f359b80 100644
--- a/activitystreams/person.go
+++ b/activitystreams/person.go
@@ -13,6 +13,9 @@ type Person struct {
 	Summary           string    `json:"summary"`
 	PublicKey         PublicKey `json:"publicKey"`
 	Endpoints         Endpoints `json:"endpoints"`
+
+	// Extensions
+	Monetization string `json:"monetization,omitempty"`
 }
 
 func NewPerson(accountRoot string) *Person {
@@ -49,3 +52,8 @@ func (p *Person) SetPrivKey(k []byte) {
 func (p *Person) GetPrivKey() []byte {
 	return p.PublicKey.privateKey
 }
+
+func (p *Person) AddWebMonetization(wallet string) {
+	p.Context = append(p.Context, apMonetizationContext)
+	p.Monetization = wallet
+}