diff --git a/src/binaryen-c.cpp b/src/binaryen-c.cpp
index dfcd425e3ff..86eb5324d29 100644
--- a/src/binaryen-c.cpp
+++ b/src/binaryen-c.cpp
@@ -628,6 +628,18 @@ BinaryenOp BinaryenCeilVecF64x2(void) { return CeilVecF64x2; }
 BinaryenOp BinaryenFloorVecF64x2(void) { return FloorVecF64x2; }
 BinaryenOp BinaryenTruncVecF64x2(void) { return TruncVecF64x2; }
 BinaryenOp BinaryenNearestVecF64x2(void) { return NearestVecF64x2; }
+BinaryenOp BinaryenExtAddPairwiseSVecI8x16ToI16x8(void) {
+  return ExtAddPairwiseSVecI8x16ToI16x8;
+}
+BinaryenOp BinaryenExtAddPairwiseUVecI8x16ToI16x8(void) {
+  return ExtAddPairwiseUVecI8x16ToI16x8;
+}
+BinaryenOp BinaryenExtAddPairwiseSVecI16x8ToI32x4(void) {
+  return ExtAddPairwiseSVecI16x8ToI32x4;
+}
+BinaryenOp BinaryenExtAddPairwiseUVecI16x8ToI32x4(void) {
+  return ExtAddPairwiseUVecI16x8ToI32x4;
+}
 BinaryenOp BinaryenTruncSatSVecF32x4ToVecI32x4(void) {
   return TruncSatSVecF32x4ToVecI32x4;
 }
diff --git a/src/binaryen-c.h b/src/binaryen-c.h
index 84661b75004..038ed43c223 100644
--- a/src/binaryen-c.h
+++ b/src/binaryen-c.h
@@ -529,7 +529,10 @@ BINARYEN_API BinaryenOp BinaryenCeilVecF64x2(void);
 BINARYEN_API BinaryenOp BinaryenFloorVecF64x2(void);
 BINARYEN_API BinaryenOp BinaryenTruncVecF64x2(void);
 BINARYEN_API BinaryenOp BinaryenNearestVecF64x2(void);
-// TODO: Add extending pairwise adds to C and JS APIs once merged
+BINARYEN_API BinaryenOp BinaryenExtAddPairwiseSVecI8x16ToI16x8(void);
+BINARYEN_API BinaryenOp BinaryenExtAddPairwiseUVecI8x16ToI16x8(void);
+BINARYEN_API BinaryenOp BinaryenExtAddPairwiseSVecI16x8ToI32x4(void);
+BINARYEN_API BinaryenOp BinaryenExtAddPairwiseUVecI16x8ToI32x4(void);
 BINARYEN_API BinaryenOp BinaryenTruncSatSVecF32x4ToVecI32x4(void);
 BINARYEN_API BinaryenOp BinaryenTruncSatUVecF32x4ToVecI32x4(void);
 BINARYEN_API BinaryenOp BinaryenConvertSVecI32x4ToVecF32x4(void);
diff --git a/src/js/binaryen.js-post.js b/src/js/binaryen.js-post.js
index 80affeefcbc..15e342eb853 100644
--- a/src/js/binaryen.js-post.js
+++ b/src/js/binaryen.js-post.js
@@ -459,6 +459,10 @@ function initializeConstants() {
     'FloorVecF64x2',
     'TruncVecF64x2',
     'NearestVecF64x2',
+    'ExtAddPairwiseSVecI8x16ToI16x8',
+    'ExtAddPairwiseUVecI8x16ToI16x8',
+    'ExtAddPairwiseSVecI16x8ToI32x4',
+    'ExtAddPairwiseUVecI16x8ToI32x4',
     'TruncSatSVecF32x4ToVecI32x4',
     'TruncSatUVecF32x4ToVecI32x4',
     'ConvertSVecI32x4ToVecF32x4',
@@ -1717,6 +1721,12 @@ function wrapModule(module, self = {}) {
     'avgr_u'(left, right) {
       return Module['_BinaryenBinary'](module, Module['AvgrUVecI16x8'], left, right);
     },
+    'extadd_pairwise_i8x16_s'(value) {
+      return Module['_BinaryenUnary'](module, Module['ExtAddPairwiseSVecI8x16ToI16x8'], value);
+    },
+    'extadd_pairwise_i8x16_u'(value) {
+      return Module['_BinaryenUnary'](module, Module['ExtAddPairwiseUVecI8x16ToI16x8'], value);
+    },
     'narrow_i32x4_s'(left, right) {
       return Module['_BinaryenBinary'](module, Module['NarrowSVecI32x4ToVecI16x8'], left, right);
     },
@@ -1822,6 +1832,12 @@ function wrapModule(module, self = {}) {
     'dot_i16x8_s'(left, right) {
       return Module['_BinaryenBinary'](module, Module['DotSVecI16x8ToVecI32x4'], left, right);
     },
+    'extadd_pairwise_i16x8_s'(value) {
+      return Module['_BinaryenUnary'](module, Module['ExtAddPairwiseSVecI16x8ToI32x4'], value);
+    },
+    'extadd_pairwise_i16x8_u'(value) {
+      return Module['_BinaryenUnary'](module, Module['ExtAddPairwiseUVecI16x8ToI32x4'], value);
+    },
     'trunc_sat_f32x4_s'(value) {
       return Module['_BinaryenUnary'](module, Module['TruncSatSVecF32x4ToVecI32x4'], value);
     },
diff --git a/test/binaryen.js/kitchen-sink.js b/test/binaryen.js/kitchen-sink.js
index c0301c0d6fd..85184346600 100644
--- a/test/binaryen.js/kitchen-sink.js
+++ b/test/binaryen.js/kitchen-sink.js
@@ -275,10 +275,14 @@ function test_core() {
     module.i16x8.neg(module.v128.const(v128_bytes)),
     module.i16x8.all_true(module.v128.const(v128_bytes)),
     module.i16x8.bitmask(module.v128.const(v128_bytes)),
+    module.i16x8.extadd_pairwise_i8x16_s(module.v128.const(v128_bytes)),
+    module.i16x8.extadd_pairwise_i8x16_u(module.v128.const(v128_bytes)),
     module.i32x4.abs(module.v128.const(v128_bytes)),
     module.i32x4.neg(module.v128.const(v128_bytes)),
     module.i32x4.all_true(module.v128.const(v128_bytes)),
     module.i32x4.bitmask(module.v128.const(v128_bytes)),
+    module.i32x4.extadd_pairwise_i16x8_s(module.v128.const(v128_bytes)),
+    module.i32x4.extadd_pairwise_i16x8_u(module.v128.const(v128_bytes)),
     module.i64x2.abs(module.v128.const(v128_bytes)),
     module.i64x2.neg(module.v128.const(v128_bytes)),
     module.i64x2.all_true(module.v128.const(v128_bytes)),
diff --git a/test/binaryen.js/kitchen-sink.js.txt b/test/binaryen.js/kitchen-sink.js.txt
index 64ff484266c..a5820381870 100644
--- a/test/binaryen.js/kitchen-sink.js.txt
+++ b/test/binaryen.js/kitchen-sink.js.txt
@@ -451,6 +451,16 @@ getExpressionInfo(tuple[3])={"id":14,"type":5,"value":3.7}
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
        )
       )
+      (drop
+       (i16x8.extadd_pairwise_i8x16_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i16x8.extadd_pairwise_i8x16_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
       (drop
        (i32x4.abs
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
@@ -471,6 +481,16 @@ getExpressionInfo(tuple[3])={"id":14,"type":5,"value":3.7}
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
        )
       )
+      (drop
+       (i32x4.extadd_pairwise_i16x8_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i32x4.extadd_pairwise_i16x8_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
       (drop
        (i64x2.abs
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
@@ -2325,6 +2345,16 @@ getExpressionInfo(tuple[3])={"id":14,"type":5,"value":3.7}
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
        )
       )
+      (drop
+       (i16x8.extadd_pairwise_i8x16_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i16x8.extadd_pairwise_i8x16_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
       (drop
        (i32x4.abs
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
@@ -2345,6 +2375,16 @@ getExpressionInfo(tuple[3])={"id":14,"type":5,"value":3.7}
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
        )
       )
+      (drop
+       (i32x4.extadd_pairwise_i16x8_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i32x4.extadd_pairwise_i16x8_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
       (drop
        (i64x2.abs
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
diff --git a/test/example/c-api-kitchen-sink.c b/test/example/c-api-kitchen-sink.c
index 887f33b58e0..7e6755f8987 100644
--- a/test/example/c-api-kitchen-sink.c
+++ b/test/example/c-api-kitchen-sink.c
@@ -586,6 +586,10 @@ void test_core() {
     makeUnary(module, BinaryenFloorVecF64x2(), v128),
     makeUnary(module, BinaryenTruncVecF64x2(), v128),
     makeUnary(module, BinaryenNearestVecF64x2(), v128),
+    makeUnary(module, BinaryenExtAddPairwiseSVecI8x16ToI16x8(), v128),
+    makeUnary(module, BinaryenExtAddPairwiseUVecI8x16ToI16x8(), v128),
+    makeUnary(module, BinaryenExtAddPairwiseSVecI16x8ToI32x4(), v128),
+    makeUnary(module, BinaryenExtAddPairwiseUVecI16x8ToI32x4(), v128),
     makeBinary(module, BinaryenNarrowSVecI16x8ToVecI8x16(), v128),
     makeBinary(module, BinaryenNarrowUVecI16x8ToVecI8x16(), v128),
     makeBinary(module, BinaryenNarrowSVecI32x4ToVecI16x8(), v128),
diff --git a/test/example/c-api-kitchen-sink.txt b/test/example/c-api-kitchen-sink.txt
index 244777478d7..54845f4cb99 100644
--- a/test/example/c-api-kitchen-sink.txt
+++ b/test/example/c-api-kitchen-sink.txt
@@ -1355,6 +1355,26 @@ BinaryenFeatureAll: 8191
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
        )
       )
+      (drop
+       (i16x8.extadd_pairwise_i8x16_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i16x8.extadd_pairwise_i8x16_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i32x4.extadd_pairwise_i16x8_s
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
+      (drop
+       (i32x4.extadd_pairwise_i16x8_u
+        (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)
+       )
+      )
       (drop
        (i8x16.narrow_i16x8_s
         (v128.const i32x4 0x04030201 0x08070605 0x0c0b0a09 0x100f0e0d)