diff --git a/src/intents/intent-expiry.guard.ts b/src/intents/intent-expiry.guard.ts
new file mode 100644
index 0000000..91e781e
--- /dev/null
+++ b/src/intents/intent-expiry.guard.ts
@@ -0,0 +1,3 @@
+export function isQuoteExpired(expiresAt: Date, now = new Date()) {
+  return expiresAt.getTime() <= now.getTime();
+}
diff --git a/src/solvers/leaderboard-query.ts b/src/solvers/leaderboard-query.ts
new file mode 100644
index 0000000..49df8c3
--- /dev/null
+++ b/src/solvers/leaderboard-query.ts
@@ -0,0 +1,5 @@
+export interface LeaderboardQuery {
+  cursor?: string;
+  limit?: number;
+  chain?: string;
+}
diff --git a/src/tokens/price-feed.provider.ts b/src/tokens/price-feed.provider.ts
new file mode 100644
index 0000000..af3664d
--- /dev/null
+++ b/src/tokens/price-feed.provider.ts
@@ -0,0 +1,3 @@
+export interface PriceFeedProvider {
+  getUsdPrice(symbol: string): Promise<number>;
+}
diff --git a/src/tokens/token-chain-response.ts b/src/tokens/token-chain-response.ts
new file mode 100644
index 0000000..ec61432
--- /dev/null
+++ b/src/tokens/token-chain-response.ts
@@ -0,0 +1,3 @@
+export function toTokenChainResponse(tokens: unknown[]) {
+  return { items: tokens };
+}