diff --git a/src/contracts-api/orderbookAction.test.ts b/src/contracts-api/orderbookAction.test.ts
new file mode 100644
index 0000000..5e29492
--- /dev/null
+++ b/src/contracts-api/orderbookAction.test.ts
@@ -0,0 +1,154 @@
+import { KwilSigner, NodeKwil } from "@trufnetwork/kwil-js";
+import { describe, it, expect, vi } from "vitest";
+import { OrderbookAction } from "./orderbookAction";
+
+/**
+ * Pure-unit tests for the address-parameterized portfolio getters (migration 051):
+ * getPositionsByWallet / getCollateralByWallet. These read a wallet BY ADDRESS (not the signer's
+ * @caller), so an owner — or a delegated market-maker bot — can monitor an agent wallet's (MAA)
+ * inventory without holding its key. The kwil client is mocked; this layer only forwards the call
+ * with the right action name + named params and maps the returned rows. The on-chain behaviour is
+ * covered by the node integration tests (tests/streams/order_book/portfolio_by_wallet_test.go).
+ */
+
+const mockSigner = { signatureType: "secp256k1_ep" } as unknown as KwilSigner;
+
+const ok = (result: unknown) => ({ status: 200, data: { result } });
+
+function makeAction(call: ReturnType<typeof vi.fn>) {
+  const mockKwil = { call } as unknown as NodeKwil;
+  return new OrderbookAction(mockKwil, mockSigner);
+}
+
+const wallet = "0x" + "ab".repeat(20);
+const bareWallet = "ab".repeat(20);
+
+describe("OrderbookAction.getPositionsByWallet", () => {
+  it("calls get_positions_by_wallet with the wallet as a named param and maps the rows", async () => {
+    const call = vi.fn().mockResolvedValue(
+      ok([
+        { query_id: 7, outcome: true, price: -55, amount: 100, position_type: "buy_order" },
+        { query_id: 9, outcome: false, price: 0, amount: 40, position_type: "holding" },
+      ]),
+    );
+    const action = makeAction(call);
+
+    const positions = await action.getPositionsByWallet(wallet);
+
+    expect(call).toHaveBeenCalledTimes(1);
+    expect(call).toHaveBeenCalledWith(
+      { namespace: "main", name: "get_positions_by_wallet", inputs: { $wallet_address: wallet } },
+      mockSigner,
+    );
+    expect(positions).toEqual([
+      { queryId: 7, outcome: true, price: -55, amount: 100, positionType: "buy_order" },
+      { queryId: 9, outcome: false, price: 0, amount: 40, positionType: "holding" },
+    ]);
+  });
+
+  it("accepts a bare-hex wallet (no 0x prefix)", async () => {
+    const call = vi.fn().mockResolvedValue(ok([]));
+    const action = makeAction(call);
+
+    await action.getPositionsByWallet(bareWallet);
+
+    expect(call.mock.calls[0][0].inputs).toEqual({ $wallet_address: bareWallet });
+  });
+
+  it("returns an empty array for a wallet that has never traded", async () => {
+    const call = vi.fn().mockResolvedValue(ok([]));
+    const action = makeAction(call);
+
+    expect(await action.getPositionsByWallet(wallet)).toEqual([]);
+  });
+
+  it("rejects a malformed wallet address before calling", async () => {
+    const call = vi.fn();
+    const action = makeAction(call);
+
+    await expect(action.getPositionsByWallet("0x1234")).rejects.toThrow(
+      "wallet address must be 40 hex characters",
+    );
+    expect(call).not.toHaveBeenCalled();
+  });
+
+  it("throws on a non-200 status", async () => {
+    const call = vi.fn().mockResolvedValue({ status: 500, data: {} });
+    const action = makeAction(call);
+
+    await expect(action.getPositionsByWallet(wallet)).rejects.toThrow(
+      "Failed to get positions by wallet: 500",
+    );
+  });
+});
+
+describe("OrderbookAction.getCollateralByWallet", () => {
+  it("calls get_collateral_by_wallet with wallet + bridge named params and maps the row", async () => {
+    const call = vi.fn().mockResolvedValue(
+      ok([
+        {
+          total_locked: "55000000000000000000",
+          buy_orders_locked: "55000000000000000000",
+          shares_value: "0",
+        },
+      ]),
+    );
+    const action = makeAction(call);
+
+    const collateral = await action.getCollateralByWallet(wallet, "hoodi_tt2");
+
+    expect(call).toHaveBeenCalledWith(
+      {
+        namespace: "main",
+        name: "get_collateral_by_wallet",
+        inputs: { $wallet_address: wallet, $bridge: "hoodi_tt2" },
+      },
+      mockSigner,
+    );
+    expect(collateral).toEqual({
+      totalLocked: "55000000000000000000",
+      buyOrdersLocked: "55000000000000000000",
+      sharesValue: "0",
+    });
+  });
+
+  it("returns zeros for a wallet that has never traded", async () => {
+    const call = vi.fn().mockResolvedValue(ok([]));
+    const action = makeAction(call);
+
+    expect(await action.getCollateralByWallet(wallet, "hoodi_tt2")).toEqual({
+      totalLocked: "0",
+      buyOrdersLocked: "0",
+      sharesValue: "0",
+    });
+  });
+
+  it("rejects an invalid or empty order-book bridge before calling", async () => {
+    const call = vi.fn();
+    const action = makeAction(call);
+
+    // hoodi_tt is the funding/fee bridge, not a valid order-book collateral bridge.
+    await expect(action.getCollateralByWallet(wallet, "hoodi_tt")).rejects.toThrow("Invalid bridge");
+    await expect(action.getCollateralByWallet(wallet, "")).rejects.toThrow("Invalid bridge");
+    expect(call).not.toHaveBeenCalled();
+  });
+
+  it("rejects a malformed wallet address before calling", async () => {
+    const call = vi.fn();
+    const action = makeAction(call);
+
+    await expect(action.getCollateralByWallet("nothex", "hoodi_tt2")).rejects.toThrow(
+      "wallet address",
+    );
+    expect(call).not.toHaveBeenCalled();
+  });
+
+  it("throws on a non-200 status", async () => {
+    const call = vi.fn().mockResolvedValue({ status: 503, data: {} });
+    const action = makeAction(call);
+
+    await expect(action.getCollateralByWallet(wallet, "hoodi_tt2")).rejects.toThrow(
+      "Failed to get collateral by wallet: 503",
+    );
+  });
+});
diff --git a/src/contracts-api/orderbookAction.ts b/src/contracts-api/orderbookAction.ts
index adc8105..4fcd22f 100644
--- a/src/contracts-api/orderbookAction.ts
+++ b/src/contracts-api/orderbookAction.ts
@@ -12,6 +12,7 @@ import {
   MarketValidation,
   OrderBookEntry,
   UserPosition,
+  WalletPosition,
   DepthLevel,
   BestPrices,
   UserCollateral,
@@ -33,6 +34,7 @@ import {
   RawMarketSummary,
   RawOrderBookEntry,
   RawUserPosition,
+  RawWalletPosition,
   RawDepthLevel,
   RawBestPrices,
   RawUserCollateral,
@@ -52,6 +54,7 @@ import {
   validateBridge,
   validateMaxSpread,
   validateSettleTime,
+  validateWalletHex,
   settledFilterToBoolean,
 } from "../util/orderbookHelpers";
 
@@ -693,6 +696,87 @@ export class OrderbookAction {
     };
   }
 
+  /**
+   * Gets a wallet's positions across all markets BY ADDRESS (get_positions_by_wallet, migration 051).
+   *
+   * Unlike getUserPositions (which reads the signer's own @caller positions), this reads the wallet
+   * you pass in — so an owner, or a delegated market-maker bot, can monitor an agent wallet's (MAA)
+   * inventory without holding its key.
+   *
+   * @param walletHex - The wallet to read, as a 20-byte hex address (with or without a 0x prefix).
+   * @returns The wallet's positions (an empty array if it has never traded).
+   */
+  async getPositionsByWallet(walletHex: string): Promise<WalletPosition[]> {
+    validateWalletHex(walletHex);
+
+    const result = await this.kwilClient.call(
+      {
+        namespace: "main",
+        name: "get_positions_by_wallet",
+        inputs: { $wallet_address: walletHex },
+      },
+      this.kwilSigner
+    );
+
+    if (result.status !== 200) {
+      throw new Error(`Failed to get positions by wallet: ${result.status}`);
+    }
+
+    const rows = (result.data?.result as RawWalletPosition[]) || [];
+    return rows.map((row) => ({
+      queryId: row.query_id,
+      outcome: row.outcome,
+      price: row.price,
+      amount: row.amount,
+      positionType: row.position_type as WalletPosition["positionType"],
+    }));
+  }
+
+  /**
+   * Gets a wallet's total locked collateral on one bridge BY ADDRESS (get_collateral_by_wallet,
+   * migration 051).
+   *
+   * Unlike getUserCollateral (which reads the signer), this reads the wallet you pass in. The bridge
+   * is required (per-bridge token decimals) — use the bridge the order-book markets settle in
+   * (e.g. hoodi_tt2 / eth_usdc), not the wallet's funding/fee bridge.
+   *
+   * @param walletHex - The wallet to read, as a 20-byte hex address (with or without a 0x prefix).
+   * @param bridge - The order-book collateral bridge namespace (required).
+   * @returns The wallet's collateral breakdown (all zeros if it has never traded).
+   */
+  async getCollateralByWallet(
+    walletHex: string,
+    bridge: string
+  ): Promise<UserCollateral> {
+    validateWalletHex(walletHex);
+    validateBridge(bridge);
+
+    const result = await this.kwilClient.call(
+      {
+        namespace: "main",
+        name: "get_collateral_by_wallet",
+        inputs: { $wallet_address: walletHex, $bridge: bridge },
+      },
+      this.kwilSigner
+    );
+
+    if (result.status !== 200) {
+      throw new Error(`Failed to get collateral by wallet: ${result.status}`);
+    }
+
+    const rows = result.data?.result as RawUserCollateral[];
+    if (!rows || rows.length === 0) {
+      return { totalLocked: "0", buyOrdersLocked: "0", sharesValue: "0" };
+    }
+
+    const row = rows[0];
+    return {
+      totalLocked: row.total_locked,
+      buyOrdersLocked: row.buy_orders_locked,
+      sharesValue: row.shares_value,
+    };
+  }
+
   // ==========================================
   // Settlement & Rewards
   // ==========================================
diff --git a/src/internal.ts b/src/internal.ts
index 5db66cb..1b800a9 100644
--- a/src/internal.ts
+++ b/src/internal.ts
@@ -112,6 +112,7 @@ export type {
   MarketValidation,
   OrderBookEntry,
   UserPosition,
+  WalletPosition,
   DepthLevel,
   BestPrices,
   UserCollateral,
diff --git a/src/types/orderbook.ts b/src/types/orderbook.ts
index 1ff7f11..d2e417b 100644
--- a/src/types/orderbook.ts
+++ b/src/types/orderbook.ts
@@ -133,6 +133,31 @@ export interface UserPosition {
   lastUpdated: number;
 }
 
+/**
+ * A wallet's position in a market, read BY ADDRESS via get_positions_by_wallet (migration 051).
+ *
+ * Unlike UserPosition (the @caller-scoped get_user_positions), this carries a position_type
+ * ('holding' | 'buy_order' | 'sell_order') instead of a last-updated timestamp — it mirrors the
+ * columns the node's get_positions_by_wallet action returns.
+ */
+export interface WalletPosition {
+  /** Market identifier */
+  queryId: number;
+  /** Outcome: true=YES, false=NO */
+  outcome: boolean;
+  /**
+   * Price in cents:
+   * - Negative: Buy order
+   * - Zero: Holding
+   * - Positive: Sell order
+   */
+  price: number;
+  /** Number of shares */
+  amount: number;
+  /** Kind of position: 'holding' | 'buy_order' | 'sell_order' */
+  positionType: "holding" | "buy_order" | "sell_order";
+}
+
 /** Aggregated depth at a price level */
 export interface DepthLevel {
   /** Price level in cents */
@@ -391,6 +416,15 @@ export interface RawUserPosition {
   last_updated: number;
 }
 
+/** @internal Raw wallet position from get_positions_by_wallet (migration 051) */
+export interface RawWalletPosition {
+  query_id: number;
+  outcome: boolean;
+  price: number;
+  amount: number;
+  position_type: string;
+}
+
 /** @internal Raw depth level from database */
 export interface RawDepthLevel {
   price: number | string;
diff --git a/src/util/orderbookHelpers.ts b/src/util/orderbookHelpers.ts
index 6a17af9..f1c060e 100644
--- a/src/util/orderbookHelpers.ts
+++ b/src/util/orderbookHelpers.ts
@@ -397,6 +397,30 @@ export function validateAmount(amount: number, operation: string): void {
  * @param bridge - Bridge identifier to validate
  * @throws Error if bridge is invalid
  */
+/**
+ * Validates a wallet address argument for the by-wallet portfolio getters (migration 051): a
+ * 20-byte hex address, with or without a 0x prefix, matching the node's get_positions_by_wallet /
+ * get_collateral_by_wallet normalization.
+ *
+ * @param wallet - The wallet address to validate.
+ * @throws Error if it is empty, not 40 hex characters (after an optional 0x prefix), or non-hex.
+ */
+export function validateWalletHex(wallet: string): void {
+  if (!wallet) {
+    throw new Error("wallet address is required");
+  }
+  const hex =
+    wallet.startsWith("0x") || wallet.startsWith("0X") ? wallet.slice(2) : wallet;
+  if (hex.length !== 40) {
+    throw new Error(
+      `wallet address must be 40 hex characters (after an optional 0x prefix), got ${hex.length}`
+    );
+  }
+  if (!/^[0-9a-fA-F]{40}$/.test(hex)) {
+    throw new Error("wallet address contains invalid hex characters");
+  }
+}
+
 export function validateBridge(bridge: string): void {
   const validBridges = [
     "eth_usdc",