{
  "@context": "https://www.w3.org/ns/activitystreams",
  "summary": "Sally offered the Foo object",
  "type": "Offer",
  "actor": {
    "type": "Person",
    "id": "http://sally.example.org",
    "summary": "Sally"
  },
  "object": "http://example.org/foo"
}