diff --git a/package-lock.json b/package-lock.json
index e7cc0a0..a56717d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@strobelabs/perpcity-sdk",
-  "version": "0.11.0",
+  "version": "0.13.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@strobelabs/perpcity-sdk",
-      "version": "0.11.0",
+      "version": "0.13.0",
       "license": "GPL-3.0",
       "dependencies": {
         "@graphql-typed-document-node/core": "^3.2.0",
diff --git a/package.json b/package.json
index cb0ccf4..12c46fc 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "@strobelabs/perpcity-sdk",
   "author": "Strobe Labs",
   "description": "TypeScript SDK for interacting with Perp City contracts",
-  "version": "0.12.0",
+  "version": "0.13.0",
   "type": "module",
   "license": "MIT",
   "repository": {
diff --git a/src/__tests__/unit/adjust-primitives.test.ts b/src/__tests__/unit/adjust-primitives.test.ts
new file mode 100644
index 0000000..fd82566
--- /dev/null
+++ b/src/__tests__/unit/adjust-primitives.test.ts
@@ -0,0 +1,135 @@
+import { decodeFunctionData, erc20Abi, getAddress } from "viem";
+import { describe, expect, it } from "vitest";
+import { PERP_ABI } from "../../abis/perp";
+import type { PerpCityContext } from "../../context";
+import { buildAdjustMakerCalls, buildAdjustTakerCalls } from "../../functions/calldata";
+import { estimateTakerAdjust } from "../../functions/perp-actions";
+import type { PerpAddress } from "../../types";
+import { Q96 } from "../../utils/constants";
+
+const HOLDER = getAddress("0x1111111111111111111111111111111111111111");
+const USDC = getAddress("0x2222222222222222222222222222222222222222");
+const PERP = getAddress("0x3333333333333333333333333333333333333333") as PerpAddress;
+
+// Pool at mark $100 (sqrt price 10) with deep liquidity so fills land near mark.
+const perpData = {
+  sqrtPriceX96: 10n * Q96,
+  liquidity: 10n ** 18n,
+  mark: 100,
+};
+
+function makeContext(opts: { allowance?: bigint } = {}): PerpCityContext {
+  return {
+    walletClient: { account: { address: HOLDER } },
+    deployments: () => ({ usdc: USDC }),
+    getPerpData: async () => perpData,
+    publicClient: {
+      readContract: async () => opts.allowance ?? 0n,
+    },
+  } as unknown as PerpCityContext;
+}
+
+describe("estimateTakerAdjust", () => {
+  it("quotes a positive (buy) delta with a negative usd leg at ~mark", async () => {
+    const quote = await estimateTakerAdjust(makeContext(), PERP, {
+      perpDelta: 1_000_000n, // +1 perp token
+    });
+    expect(quote.usdDelta).toBeLessThan(0n);
+    expect(quote.fillPrice).toBeGreaterThan(99.9);
+    expect(quote.fillPrice).toBeLessThan(100.1);
+    expect(quote.exceedsLiquidity).toBe(false);
+  });
+
+  it("quotes a negative (sell) delta with a positive usd leg at ~mark", async () => {
+    const quote = await estimateTakerAdjust(makeContext(), PERP, {
+      perpDelta: -1_000_000n, // -1 perp token (reduce a long / open a short)
+    });
+    expect(quote.usdDelta).toBeGreaterThan(0n);
+    expect(quote.fillPrice).toBeGreaterThan(99.9);
+    expect(quote.fillPrice).toBeLessThan(100.1);
+    expect(quote.exceedsLiquidity).toBe(false);
+  });
+
+  it("rejects a zero delta", async () => {
+    await expect(estimateTakerAdjust(makeContext(), PERP, { perpDelta: 0n })).rejects.toThrow(
+      /non-zero/
+    );
+  });
+});
+
+describe("buildAdjustTakerCalls", () => {
+  const params = { posId: 7n, marginDelta: 5_000_000n, perpDelta: 1_000_000n, amt1Limit: 123n };
+
+  it("prepends a USDC approve when margin is added and allowance is short", async () => {
+    const calls = await buildAdjustTakerCalls(makeContext({ allowance: 0n }), PERP, params);
+    expect(calls).toHaveLength(2);
+    expect(getAddress(calls[0].to)).toBe(USDC);
+    const approve = decodeFunctionData({ abi: erc20Abi, data: calls[0].data });
+    expect(approve.functionName).toBe("approve");
+    expect(approve.args).toEqual([PERP, params.marginDelta]);
+    const adjust = decodeFunctionData({ abi: PERP_ABI, data: calls[1].data });
+    expect(adjust.functionName).toBe("adjustTaker");
+  });
+
+  it("skips the approve when the allowance already covers the margin", async () => {
+    const calls = await buildAdjustTakerCalls(
+      makeContext({ allowance: params.marginDelta }),
+      PERP,
+      params
+    );
+    expect(calls).toHaveLength(1);
+    expect(getAddress(calls[0].to)).toBe(PERP);
+  });
+
+  it("never approves for a reduce (no margin in)", async () => {
+    // No publicClient.readContract stubbing needed: marginDelta <= 0 must not
+    // even check the allowance.
+    const context = {
+      walletClient: { account: { address: HOLDER } },
+      deployments: () => ({ usdc: USDC }),
+    } as unknown as PerpCityContext;
+    const calls = await buildAdjustTakerCalls(context, PERP, {
+      posId: 7n,
+      marginDelta: 0n,
+      perpDelta: -1_000_000n,
+      amt1Limit: 90n,
+    });
+    expect(calls).toHaveLength(1);
+    const adjust = decodeFunctionData({ abi: PERP_ABI, data: calls[0].data });
+    expect(adjust.functionName).toBe("adjustTaker");
+  });
+});
+
+describe("buildAdjustMakerCalls", () => {
+  it("approval covers margin plus the USD leg when adding liquidity", async () => {
+    const calls = await buildAdjustMakerCalls(makeContext({ allowance: 0n }), PERP, {
+      posId: 9n,
+      marginDelta: 5_000_000n,
+      liquidityDelta: 1_000n,
+      amt0Limit: 0n,
+      amt1Limit: 2_000_000n,
+    });
+    expect(calls).toHaveLength(2);
+    const approve = decodeFunctionData({ abi: erc20Abi, data: calls[0].data });
+    expect(approve.args).toEqual([PERP, 7_000_000n]); // margin + amt1Limit
+    const adjust = decodeFunctionData({ abi: PERP_ABI, data: calls[1].data });
+    expect(adjust.functionName).toBe("adjustMaker");
+  });
+
+  it("no approve when removing liquidity and withdrawing margin", async () => {
+    const context = {
+      walletClient: { account: { address: HOLDER } },
+      deployments: () => ({ usdc: USDC }),
+    } as unknown as PerpCityContext;
+    const calls = await buildAdjustMakerCalls(context, PERP, {
+      posId: 9n,
+      marginDelta: -5_000_000n,
+      liquidityDelta: -1_000n,
+      amt0Limit: 0n,
+      amt1Limit: 0n,
+    });
+    expect(calls).toHaveLength(1);
+    const adjust = decodeFunctionData({ abi: PERP_ABI, data: calls[0].data });
+    expect(adjust.functionName).toBe("adjustMaker");
+  });
+});
diff --git a/src/functions/calldata.ts b/src/functions/calldata.ts
index cf1ab98..4141ccd 100644
--- a/src/functions/calldata.ts
+++ b/src/functions/calldata.ts
@@ -218,6 +218,56 @@ export async function buildOpenTakerPositionCalls(
   return calls;
 }
 
+/**
+ * Full ordered call batch for a taker adjustment: a USDC `approve` (only when
+ * margin is being added and the current allowance is short) followed by
+ * `adjustTaker`. Margin is the only USDC the contract pulls on a taker adjust
+ * (the swap's USD leg settles inside position inventory), so the approval
+ * covers exactly `marginDelta`.
+ */
+export async function buildAdjustTakerCalls(
+  context: PerpCityContext,
+  perpAddress: PerpAddress,
+  params: { posId: bigint; marginDelta: bigint; perpDelta: bigint; amt1Limit: bigint }
+): Promise<CallData[]> {
+  const calls: CallData[] = [];
+  if (params.marginDelta > 0n) {
+    const approval = await maybeApprovalCall(context, perpAddress, params.marginDelta);
+    if (approval) calls.push(approval);
+  }
+  calls.push(buildAdjustTakerCall(perpAddress, params));
+  return calls;
+}
+
+/**
+ * Full ordered call batch for a maker adjustment; see
+ * {@link buildAdjustTakerCalls}. Like `openMaker`, an `adjustMaker` that adds
+ * liquidity can pull the USDC leg of the LP deposit (up to `amt1Limit`) on top
+ * of the margin, so the approval covers both.
+ */
+export async function buildAdjustMakerCalls(
+  context: PerpCityContext,
+  perpAddress: PerpAddress,
+  params: {
+    posId: bigint;
+    marginDelta: bigint;
+    liquidityDelta: bigint;
+    amt0Limit: bigint;
+    amt1Limit: bigint;
+  }
+): Promise<CallData[]> {
+  const calls: CallData[] = [];
+  const marginIn = params.marginDelta > 0n ? params.marginDelta : 0n;
+  const usdLegIn = params.liquidityDelta > 0n ? params.amt1Limit : 0n;
+  const requiredApproval = marginIn + usdLegIn;
+  if (requiredApproval > 0n) {
+    const approval = await maybeApprovalCall(context, perpAddress, requiredApproval);
+    if (approval) calls.push(approval);
+  }
+  calls.push(buildAdjustMakerCall(perpAddress, params));
+  return calls;
+}
+
 /** Full ordered call batch for opening a maker position; see {@link buildOpenTakerPositionCalls}. */
 export async function buildOpenMakerPositionCalls(
   context: PerpCityContext,
diff --git a/src/functions/perp-actions.ts b/src/functions/perp-actions.ts
index 68eef3c..c46ffbe 100644
--- a/src/functions/perp-actions.ts
+++ b/src/functions/perp-actions.ts
@@ -6,6 +6,7 @@ import type { PerpCityContext } from "../context";
 import type { PerpAddress } from "../types";
 import type {
   CreatePerpParams,
+  EstimateTakerAdjustResult,
   EstimateTakerPositionResult,
   OpenMakerPositionParams,
   OpenTakerPositionParams,
@@ -344,6 +345,39 @@ export async function estimateTakerPosition(
   }, "estimateTakerPosition");
 }
 
+/**
+ * Quote an arbitrary signed taker adjustment delta against current pool state.
+ *
+ * The `adjustTaker` companion to {@link estimateTakerPosition}: pass the exact
+ * signed `perpDelta` the adjust call will submit (positive buys perp, negative
+ * sells — an add for a long is positive, a reduce negative, a flip the full
+ * signed total) and get the simulated USD leg, average fill price, and depth
+ * flag. Pure client-side math against the constant-liquidity model
+ * (`simulateTakerSwap`) — no eth_call, so it is safe on reactive quote paths.
+ * Fees are not modeled; slippage tolerance is expected to absorb them.
+ */
+export async function estimateTakerAdjust(
+  context: PerpCityContext,
+  perpAddress: PerpAddress,
+  params: { perpDelta: bigint }
+): Promise<EstimateTakerAdjustResult> {
+  return withErrorHandling(async () => {
+    if (params.perpDelta === 0n) throw new Error("perpDelta must be non-zero");
+    const perpData = await context.getPerpData(perpAddress);
+    const swap = simulateTakerSwap({
+      sqrtPriceX96: perpData.sqrtPriceX96,
+      liquidity: perpData.liquidity,
+      perpDelta: params.perpDelta,
+      markPrice: perpData.mark,
+    });
+    return {
+      usdDelta: swap.usdDelta,
+      fillPrice: swap.fillPrice,
+      exceedsLiquidity: swap.exceedsLiquidity,
+    };
+  }, "estimateTakerAdjust");
+}
+
 export async function adjustTaker(
   context: PerpCityContext,
   perpAddress: PerpAddress,
@@ -363,6 +397,8 @@ export async function adjustTaker(
     const txHash = await context.walletClient.writeContract(
       await withFeeHeadroom(context.publicClient, request)
     );
+    const receipt = await context.publicClient.waitForTransactionReceipt({ hash: txHash });
+    if (receipt.status === "reverted") throw new Error(`Transaction reverted. Hash: ${txHash}`);
     return { txHash };
   }, `adjustTaker for position ${params.posId}`);
 }
@@ -392,6 +428,8 @@ export async function adjustMaker(
     const txHash = await context.walletClient.writeContract(
       await withFeeHeadroom(context.publicClient, request)
     );
+    const receipt = await context.publicClient.waitForTransactionReceipt({ hash: txHash });
+    if (receipt.status === "reverted") throw new Error(`Transaction reverted. Hash: ${txHash}`);
     return { txHash };
   }, `adjustMaker for position ${params.posId}`);
 }
diff --git a/src/types/entity-data.ts b/src/types/entity-data.ts
index a6db783..b8405a1 100644
--- a/src/types/entity-data.ts
+++ b/src/types/entity-data.ts
@@ -126,6 +126,13 @@ export type EstimateTakerPositionResult = {
   exceedsLiquidity: boolean;
 };
 
+export type EstimateTakerAdjustResult = {
+  usdDelta: bigint;
+  fillPrice: number;
+  /** See {@link EstimateTakerPositionResult.exceedsLiquidity}. */
+  exceedsLiquidity: boolean;
+};
+
 export type CacheConfig = {
   ttl: number; // Time to live in milliseconds
   maxSize: number; // Maximum cache size