diff --git a/common/contract.ts b/common/contract.ts
index 8427c84b..dc91a20e 100644
--- a/common/contract.ts
+++ b/common/contract.ts
@@ -33,6 +33,7 @@ export type Contract<T extends AnyContractType = AnyContractType> = {
   isResolved: boolean
   resolutionTime?: number // When the contract creator resolved the market
   resolution?: string
+  resolutionProbability?: number,
 
   closeEmailsSent?: number
 
diff --git a/docs/docs/api.md b/docs/docs/api.md
index 1b2c9e6e..e7e6a341 100644
--- a/docs/docs/api.md
+++ b/docs/docs/api.md
@@ -127,6 +127,7 @@ Requires no authorization.
     isResolved: boolean
     resolutionTime?: number
     resolution?: string
+    resolutionProbability?: number  // Used for BINARY markets resolved to MKT
   }
   ```
 
diff --git a/web/pages/api/v0/_types.ts b/web/pages/api/v0/_types.ts
index 47671ed4..4909efc9 100644
--- a/web/pages/api/v0/_types.ts
+++ b/web/pages/api/v0/_types.ts
@@ -36,6 +36,7 @@ export type LiteMarket = {
   isResolved: boolean
   resolution?: string
   resolutionTime?: number
+  resolutionProbability?: number
 }
 
 export type ApiAnswer = Answer & {
@@ -73,6 +74,7 @@ export function toLiteMarket(contract: Contract): LiteMarket {
     isResolved,
     resolution,
     resolutionTime,
+    resolutionProbability,
   } = contract
 
   const { p, totalLiquidity } = contract as any
@@ -106,6 +108,7 @@ export function toLiteMarket(contract: Contract): LiteMarket {
     isResolved,
     resolution,
     resolutionTime,
+    resolutionProbability,
   })
 }