Add an endpoint for precise circulating supply

documentation/en/api-methods.md

@@ -165,6 +165,7 @@
   * [StateSectorGetInfo](#StateSectorGetInfo)
   * [StateSectorPartition](#StateSectorPartition)
   * [StateSectorPreCommitInfo](#StateSectorPreCommitInfo)
+  * [StateVMCirculatingSupply](#StateVMCirculatingSupply)
   * [StateVerifiedClientStatus](#StateVerifiedClientStatus)
   * [StateVerifiedRegistryRootKey](#StateVerifiedRegistryRootKey)
   * [StateVerifierStatus](#StateVerifierStatus)
@@ -3094,7 +3095,8 @@ Response:
 ```
 
 ### StateCirculatingSupply
-StateCirculatingSupply returns the circulating supply of Filecoin at the given tipset
+StateCirculatingSupply returns the exact circulating supply of Filecoin at the given tipset.
+This is not used anywhere in the protocol itself, and is only for external consumption.
 
 
 Perms: read
@@ -3113,16 +3115,7 @@ Inputs:
 ]
 ```
 
-Response:
-```json
-{
-  "FilVested": "0",
-  "FilMined": "0",
-  "FilBurnt": "0",
-  "FilLocked": "0",
-  "FilCirculating": "0"
-}
-```
+Response: `"0"`
 
 ### StateCompute
 StateCompute is a flexible command that applies the given messages on the given tipset.
@@ -4265,6 +4258,38 @@ Response:
 }
 ```
 
+### StateVMCirculatingSupply
+StateVMCirculatingSupply returns an approximation of the circulating supply of Filecoin at the given tipset.
+This is the value reported by the runtime interface to actors code.
+
+
+Perms: read
+
+Inputs:
+```json
+[
+  [
+    {
+      "/": "bafy2bzacea3wsdh6y3a36tb3skempjoxqpuyompjbmfeyf34fi3uy6uue42v4"
+    },
+    {
+      "/": "bafy2bzacebp3shtrn43k7g3unredz7fxn4gj533d3o43tqn2p2ipxxhrvchve"
+    }
+  ]
+]
+```
+
+Response:
+```json
+{
+  "FilVested": "0",
+  "FilMined": "0",
+  "FilBurnt": "0",
+  "FilLocked": "0",
+  "FilCirculating": "0"
+}
+```
+
 ### StateVerifiedClientStatus
 StateVerifiedClientStatus returns the data cap for the given address.
 Returns nil if there is no entry in the data cap table for the