diff --git a/x/rootpool/types/types.go b/x/rootpool/types/types.go
new file mode 100644
index 0000000..3226d3d
--- /dev/null
+++ b/x/rootpool/types/types.go
@@ -0,0 +1,43 @@
+package types
+
+import "encoding/json"
+
+const (
+	ModuleName   = "rootpool"
+	StoreKey     = ModuleName
+	RouterKey    = ModuleName
+	QuerierRoute = ModuleName
+)
+
+// RootPool is the mesh's treasury (§5)
+// Attested by Watchers, visible to every Holder.
+type RootPool struct {
+	BalanceGrain    int64  `json:"balance_grain" yaml:"balance_grain"`
+	LastAttestation int64  `json:"last_attestation" yaml:"last_attestation"`
+	QuorumMet       bool   `json:"quorum_met" yaml:"quorum_met"`
+	ReserveRatioPct uint32 `json:"reserve_ratio_pct" yaml:"reserve_ratio_pct"`
+}
+
+// RootPoolEntry tracks incoming/outgoing Root-Pool movements
+type RootPoolEntry struct {
+	EntryID   string `json:"entry_id" yaml:"entry_id"`
+	Source    string `json:"source" yaml:"source"`
+	Amount    int64  `json:"amount" yaml:"amount"`
+	Reason    string `json:"reason" yaml:"reason"`
+	Timestamp int64  `json:"timestamp" yaml:"timestamp"`
+}
+
+type Params struct{}
+
+func DefaultParams() Params { return Params{} }
+
+type GenesisState struct {
+	Params   Params   `json:"params" yaml:"params"`
+	RootPool RootPool `json:"root_pool" yaml:"root_pool"`
+}
+
+func DefaultGenesisState() *GenesisState {
+	return &GenesisState{Params: DefaultParams()}
+}
+
+func ValidateGenesis(bz json.RawMessage) error { return nil }
diff --git a/x/stash/types/types.go b/x/stash/types/types.go
new file mode 100644
index 0000000..6fa391e
--- /dev/null
+++ b/x/stash/types/types.go
@@ -0,0 +1,55 @@
+package types
+
+import "encoding/json"
+
+const (
+	ModuleName   = "stash"
+	StoreKey     = ModuleName
+	RouterKey    = ModuleName
+	QuerierRoute = ModuleName
+)
+
+// Stash is a per-Holder sovereign storage (§5)
+// The Holder owns it. No one else can access it without a Window (§10).
+type Stash struct {
+	HolderID     string `json:"holder_id" yaml:"holder_id"`
+	StashID      string `json:"stash_id" yaml:"stash_id"`
+	CreatedAt    int64  `json:"created_at" yaml:"created_at"`
+	LastActive   int64  `json:"last_active" yaml:"last_active"`
+	BalanceGrain int64  `json:"balance_grain" yaml:"balance_grain"`
+	IsStill      bool   `json:"is_still" yaml:"is_still"` // Still = Holder paused partner access (§10)
+}
+
+// StashActivity tracks Stash maturity for Freeholder signals (§9.1: 90 days, no gap >30 days)
+type StashActivity struct {
+	StashID         string `json:"stash_id" yaml:"stash_id"`
+	ActiveDays      uint32 `json:"active_days" yaml:"active_days"`
+	MaxGapDays      uint32 `json:"max_gap_days" yaml:"max_gap_days"` // must be ≤30 for Freeholder
+	LastActivityDay int64  `json:"last_activity_day" yaml:"last_activity_day"`
+}
+
+// MaturityThreshold for Freeholder signal (§9.1: 90 days)
+const MaturityThresholdDays = 90
+
+// MaxGapForMaturity for Freeholder signal (§9.1: no gap > 30 days)
+const MaxGapForMaturity = 30
+
+// IsMature checks if Stash activity meets the Freeholder maturity threshold (§9.1)
+func (a StashActivity) IsMature() bool {
+	return a.ActiveDays >= MaturityThresholdDays && a.MaxGapDays <= MaxGapForMaturity
+}
+
+type Params struct{}
+
+func DefaultParams() Params { return Params{} }
+
+type GenesisState struct {
+	Params  Params  `json:"params" yaml:"params"`
+	Stashes []Stash `json:"stashes" yaml:"stashes"`
+}
+
+func DefaultGenesisState() *GenesisState {
+	return &GenesisState{Params: DefaultParams(), Stashes: []Stash{}}
+}
+
+func ValidateGenesis(bz json.RawMessage) error { return nil }
diff --git a/x/stash/types/types_test.go b/x/stash/types/types_test.go
new file mode 100644
index 0000000..4a83cdd
--- /dev/null
+++ b/x/stash/types/types_test.go
@@ -0,0 +1,43 @@
+package types_test
+
+import (
+	"testing"
+
+	"github.com/oy/openyield/x/stash/types"
+)
+
+func TestMaturityThreshold(t *testing.T) {
+	if types.MaturityThresholdDays != 90 {
+		t.Errorf("MaturityThresholdDays = %d, expected 90 (§9.1)", types.MaturityThresholdDays)
+	}
+}
+
+func TestMaxGapForMaturity(t *testing.T) {
+	if types.MaxGapForMaturity != 30 {
+		t.Errorf("MaxGapForMaturity = %d, expected 30 (§9.1: no gap > 30 days)", types.MaxGapForMaturity)
+	}
+}
+
+func TestStashIsMature(t *testing.T) {
+	mature := types.StashActivity{ActiveDays: 90, MaxGapDays: 15}
+	if !mature.IsMature() {
+		t.Error("90 days active, 15 max gap should be mature (§9.1)")
+	}
+
+	notEnoughDays := types.StashActivity{ActiveDays: 89, MaxGapDays: 15}
+	if notEnoughDays.IsMature() {
+		t.Error("89 days should NOT be mature (threshold = 90)")
+	}
+
+	gapTooBig := types.StashActivity{ActiveDays: 100, MaxGapDays: 31}
+	if gapTooBig.IsMature() {
+		t.Error("31-day gap should NOT be mature (max gap = 30)")
+	}
+}
+
+func TestStashStillFlag(t *testing.T) {
+	stash := types.Stash{IsStill: true}
+	if !stash.IsStill {
+		t.Error("Stash with IsStill=true should reflect Still state (§10: Holder paused partner access)")
+	}
+}
diff --git a/x/vault/types/types.go b/x/vault/types/types.go
new file mode 100644
index 0000000..38de60f
--- /dev/null
+++ b/x/vault/types/types.go
@@ -0,0 +1,42 @@
+package types
+
+import "encoding/json"
+
+const (
+	ModuleName   = "vault"
+	StoreKey     = ModuleName
+	RouterKey    = ModuleName
+	QuerierRoute = ModuleName
+)
+
+// Vault is a per-Stand governed storage (§5)
+// Governed by the Stand Council (§19). Holds shared funds for a Stand.
+type Vault struct {
+	VaultID      string `json:"vault_id" yaml:"vault_id"`
+	StandID      string `json:"stand_id" yaml:"stand_id"`
+	CreatedAt    int64  `json:"created_at" yaml:"created_at"`
+	BalanceGrain int64  `json:"balance_grain" yaml:"balance_grain"`
+}
+
+// VaultAllocation tracks sub-Vault allocations within a Stand
+type VaultAllocation struct {
+	VaultID    string `json:"vault_id" yaml:"vault_id"`
+	SubVaultID string `json:"sub_vault_id" yaml:"sub_vault_id"`
+	Percentage uint32 `json:"percentage" yaml:"percentage"`
+	Purpose    string `json:"purpose" yaml:"purpose"`
+}
+
+type Params struct{}
+
+func DefaultParams() Params { return Params{} }
+
+type GenesisState struct {
+	Params Params  `json:"params" yaml:"params"`
+	Vaults []Vault `json:"vaults" yaml:"vaults"`
+}
+
+func DefaultGenesisState() *GenesisState {
+	return &GenesisState{Params: DefaultParams(), Vaults: []Vault{}}
+}
+
+func ValidateGenesis(bz json.RawMessage) error { return nil }