diff --git a/src/plugins/github/api.js b/src/plugins/github/api.js
index 428f380..9e46acd 100644
--- a/src/plugins/github/api.js
+++ b/src/plugins/github/api.js
@@ -31,6 +31,7 @@ import {
   PULL_REQUEST_NODE_TYPE,
   PULL_REQUEST_REVIEW_COMMENT_NODE_TYPE,
   PULL_REQUEST_REVIEW_NODE_TYPE,
+  REPOSITORY_NODE_TYPE,
   REFERENCES_EDGE_TYPE,
 } from "./types";
 
@@ -53,6 +54,34 @@ function assertEntityType(e: Entity, t: NodeType) {
   }
 }
 
+export class Porcelain {
+  graph: Graph<NodePayload, EdgePayload>;
+
+  constructor(graph: Graph<NodePayload, EdgePayload>) {
+    this.graph = graph;
+  }
+
+  /* Return all the repositories in the graph */
+  repositories(): Repository[] {
+    return this.graph
+      .nodes({type: REPOSITORY_NODE_TYPE})
+      .map((n) => new Repository(this.graph, n.address));
+  }
+
+  /* Return the repository with the given owner and name */
+  repository(owner: string, name: string): Repository {
+    const repo = this.repositories().filter(
+      (r) => r.owner() === owner && r.name() === name
+    );
+    if (repo.length > 1) {
+      throw new Error(
+        `Unexpectedly found multiple repositories named ${owner}/${name}`
+      );
+    }
+    return repo[0];
+  }
+}
+
 class GithubEntity<T: NodePayload> {
   graph: Graph<NodePayload, EdgePayload>;
   nodeAddress: Address;
diff --git a/src/plugins/github/api.test.js b/src/plugins/github/api.test.js
index 5b68350..e9f9ff8 100644
--- a/src/plugins/github/api.test.js
+++ b/src/plugins/github/api.test.js
@@ -2,7 +2,7 @@
 
 import {parse} from "./parser";
 import exampleRepoData from "./demoData/example-github.json";
-import {Repository, Issue, PullRequest, Comment, Author} from "./api";
+import {Porcelain, Issue, PullRequest, Comment, Author} from "./api";
 import {
   AUTHOR_NODE_TYPE,
   COMMENT_NODE_TYPE,
@@ -11,11 +11,11 @@ import {
   PULL_REQUEST_REVIEW_NODE_TYPE,
   PULL_REQUEST_REVIEW_COMMENT_NODE_TYPE,
 } from "./types";
+
 describe("GitHub porcelain API", () => {
   const graph = parse(exampleRepoData);
-  // TODO: Create a higher level API that contains all the repositories
-  const repoNode = graph.nodes({type: "REPOSITORY"})[0];
-  const repo = new Repository(graph, repoNode.address);
+  const porcelain = new Porcelain(graph);
+  const repo = porcelain.repository("sourcecred", "example-github");
   function issueOrPRByNumber(n: number): Issue | PullRequest {
     const result = repo.issueOrPRByNumber(n);
     if (result == null) {
@@ -23,6 +23,18 @@ describe("GitHub porcelain API", () => {
     }
     return result;
   }
+  describe("has repository finding", () => {
+    it("which works for an existing repository", () => {
+      expect(porcelain.repository("sourcecred", "example-github")).toEqual(
+        expect.anything()
+      );
+    });
+
+    it("which returns undefined when asking for a nonexistent repo", () => {
+      expect(porcelain.repository("sourcecred", "bad-repo")).toBe(undefined);
+    });
+  });
+
   describe("has wrappers for", () => {
     it("Repositories", () => {
       expect(repo.url()).toBe("https://github.com/sourcecred/example-github");