diff --git a/cmd/lotus-shed/postfind.go b/cmd/lotus-shed/postfind.go
new file mode 100644
index 000000000..91377b734
--- /dev/null
+++ b/cmd/lotus-shed/postfind.go
@@ -0,0 +1,76 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/filecoin-project/go-state-types/abi"
+	"github.com/filecoin-project/lotus/chain/types"
+	lcli "github.com/filecoin-project/lotus/cli"
+	"github.com/filecoin-project/specs-actors/v2/actors/builtin"
+	"github.com/urfave/cli/v2"
+)
+
+var postFindCmd = &cli.Command{
+	Name:        "post-find",
+	Description: "return addresses of all miners who have posted in the last day",
+	Flags: []cli.Flag{
+		&cli.StringFlag{
+			Name:  "tipset",
+			Usage: "specify tipset state to search on",
+		},
+	},
+	Action: func(c *cli.Context) error {
+		api, acloser, err := lcli.GetFullNodeAPI(c)
+		if err != nil {
+			return err
+		}
+		defer acloser()
+		ctx := lcli.ReqContext(c)
+
+		ts, err := lcli.LoadTipSet(ctx, c, api)
+		if err != nil {
+			return err
+		}
+		if ts == nil {
+			ts, err = api.ChainHead(ctx)
+			if err != nil {
+				return err
+			}
+		}
+		oneDayAgo := ts.Height() - abi.ChainEpoch(2880)
+
+		mAddrs, err := api.StateListMiners(ctx, ts.Key())
+		if err != nil {
+			return err
+		}
+
+		for _, mAddr := range mAddrs {
+			// if they have no power ignore. This filters out 14k inactive miners
+			// so we can do 100x fewer expensive message queries
+			power, err := api.StateMinerPower(ctx, mAddr, ts.Key())
+			if err != nil {
+				return err
+			}
+			if !power.HasMinPower {
+				continue
+			}
+			query := &types.Message{To: mAddr}
+			mCids, err := api.StateListMessages(ctx, query, ts.Key(), oneDayAgo)
+			if err != nil {
+				return err
+			}
+			for _, mCid := range mCids {
+				msg, err := api.ChainGetMessage(ctx, mCid)
+				if err != nil {
+					return err
+				}
+				if msg.Method == builtin.MethodsMiner.SubmitWindowedPoSt {
+					fmt.Printf("%s\n", mAddr)
+					break // go to next mAddr
+				}
+			}
+		}
+
+		return nil
+	},
+}