diff --git a/.circleci/config.yml b/.circleci/config.yml
index 34f124368..f8550a15b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -340,6 +340,12 @@ jobs:
       - run:
           name: Build and run schema generator
           command: cargo schema --locked
+      - run:
+          name: Integration Tests
+          command: |
+            rustup target add wasm32-unknown-unknown
+            cargo build --release --target wasm32-unknown-unknown --locked
+            cargo test --test integration --locked
       - run:
           name: Ensure checked-in schemas are up-to-date
           command: |
diff --git a/Cargo.lock b/Cargo.lock
index 4931a2f97..2ff0484b4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,17 +1,62 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+[[package]]
+name = "addr2line"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a55f82cfe485775d02112886f4169bde0c5894d75e79ead7eafe7e40a25e45f7"
+dependencies = [
+ "gimli 0.23.0",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
 [[package]]
 name = "autocfg"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
+[[package]]
+name = "backtrace"
+version = "0.3.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d117600f438b1707d4e4ae15d3595657288f8235a0eb593e80ecc98ab34e1bc"
+dependencies = [
+ "addr2line",
+ "cfg-if 1.0.0",
+ "libc",
+ "miniz_oxide",
+ "object 0.23.0",
+ "rustc-demangle",
+]
+
 [[package]]
 name = "base64"
 version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "904dfeac50f3cdaba28fc6f57fdcddb75f49ed61346676a78c4ffe55877802fd"
 
+[[package]]
+name = "bincode"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d175dfa69e619905c4c3cdb7c3c203fa3bdd5d51184e3afdb2742c0280493772"
+dependencies = [
+ "byteorder",
+ "serde",
+]
+
+[[package]]
+name = "bitflags"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
+
 [[package]]
 name = "bitvec"
 version = "0.18.5"
@@ -65,12 +110,30 @@ version = "1.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
 
+[[package]]
+name = "cc"
+version = "1.0.67"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3c69b077ad434294d3ce9f1f6143a2a4b89a8a2d54ef813d85003a4fd1137fd"
+
+[[package]]
+name = "cfg-if"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "clru"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "591ff76ca0691bd91c1b0b5b987e5cf93b21ec810ad96665c5a569c60846dd93"
+
 [[package]]
 name = "const-oid"
 version = "0.4.5"
@@ -86,7 +149,7 @@ dependencies = [
  "digest 0.9.0",
  "ed25519-zebra",
  "k256",
- "rand_core",
+ "rand_core 0.5.1",
  "thiserror",
 ]
 
@@ -134,12 +197,151 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "cosmwasm-vm"
+version = "0.14.0-alpha2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "324d56bba2148c074c73e4b9811b531dbd4de4158aeca8796660b5534a7c22bf"
+dependencies = [
+ "clru",
+ "cosmwasm-crypto",
+ "cosmwasm-std",
+ "hex 0.4.3",
+ "parity-wasm",
+ "schemars",
+ "serde",
+ "serde_json",
+ "sha2 0.9.3",
+ "thiserror",
+ "wasmer",
+ "wasmer-middlewares",
+]
+
 [[package]]
 name = "cpuid-bool"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8aebca1129a03dc6dc2b127edd729435bbc4a37e1d5f4d7513165089ceb02634"
 
+[[package]]
+name = "cranelift-bforest"
+version = "0.68.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9221545c0507dc08a62b2d8b5ffe8e17ac580b0a74d1813b496b8d70b070fbd0"
+dependencies = [
+ "cranelift-entity",
+]
+
+[[package]]
+name = "cranelift-codegen"
+version = "0.68.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7e9936ea608b6cd176f107037f6adbb4deac933466fc7231154f96598b2d3ab1"
+dependencies = [
+ "byteorder",
+ "cranelift-bforest",
+ "cranelift-codegen-meta",
+ "cranelift-codegen-shared",
+ "cranelift-entity",
+ "gimli 0.22.0",
+ "log",
+ "regalloc",
+ "smallvec",
+ "target-lexicon",
+ "thiserror",
+]
+
+[[package]]
+name = "cranelift-codegen-meta"
+version = "0.68.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ef2b2768568306540f4c8db3acce9105534d34c4a1e440529c1e702d7f8c8d7"
+dependencies = [
+ "cranelift-codegen-shared",
+ "cranelift-entity",
+]
+
+[[package]]
+name = "cranelift-codegen-shared"
+version = "0.68.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6759012d6d19c4caec95793f052613e9d4113e925e7f14154defbac0f1d4c938"
+
+[[package]]
+name = "cranelift-entity"
+version = "0.68.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86badbce14e15f52a45b666b38abe47b204969dd7f8fb7488cb55dd46b361fa6"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "cranelift-frontend"
+version = "0.68.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b608bb7656c554d0a4cf8f50c7a10b857e80306f6ff829ad6d468a7e2323c8d8"
+dependencies = [
+ "cranelift-codegen",
+ "log",
+ "smallvec",
+ "target-lexicon",
+]
+
+[[package]]
+name = "crc32fast"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81156fece84ab6a9f2afdb109ce3ae577e42b1228441eded99bd77f627953b1a"
+dependencies = [
+ "cfg-if 1.0.0",
+]
+
+[[package]]
+name = "crossbeam-channel"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dca26ee1f8d361640700bde38b2c37d8c22b3ce2d360e1fc1c74ea4b0aa7d775"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94af6efb46fef72616855b036a624cf27ba656ffc9be1b9a3c931cfc7749a9a9"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crossbeam-epoch",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2584f639eb95fea8c798496315b297cf81b9b58b6d30ab066a75455333cf4b12"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crossbeam-utils",
+ "lazy_static",
+ "memoffset",
+ "scopeguard",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7e9d99fa91428effe99c5c6d4634cdeba32b8cf784fc428a2a687f61a952c49"
+dependencies = [
+ "autocfg",
+ "cfg-if 1.0.0",
+ "lazy_static",
+]
+
 [[package]]
 name = "crypto-mac"
 version = "0.10.0"
@@ -158,7 +360,7 @@ checksum = "f627126b946c25a4638eec0ea634fc52506dea98db118aae985118ce7c3d723f"
 dependencies = [
  "byteorder",
  "digest 0.9.0",
- "rand_core",
+ "rand_core 0.5.1",
  "subtle",
  "zeroize",
 ]
@@ -304,12 +506,14 @@ version = "0.5.0"
 dependencies = [
  "cosmwasm-schema",
  "cosmwasm-std",
+ "cosmwasm-vm",
  "cw-storage-plus",
  "cw0",
  "cw2",
  "cw20",
  "cw20-base",
- "num-integer",
+ "integer-cbrt",
+ "integer-sqrt",
  "rust_decimal",
  "schemars",
  "serde",
@@ -465,6 +669,41 @@ dependencies = [
  "thiserror",
 ]
 
+[[package]]
+name = "darling"
+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06d4a9551359071d1890820e3571252b91229e0712e7c36b08940e603c5a8fc"
+dependencies = [
+ "darling_core",
+ "darling_macro",
+]
+
+[[package]]
+name = "darling_core"
+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b443e5fb0ddd56e0c9bfa47dc060c5306ee500cb731f2b91432dd65589a77684"
+dependencies = [
+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim",
+ "syn",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0220073ce504f12a70efc4e7cdaea9e9b1b324872e7ad96a208056d7a638b81"
+dependencies = [
+ "darling_core",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "der"
 version = "0.1.0"
@@ -492,6 +731,32 @@ dependencies = [
  "generic-array 0.14.4",
 ]
 
+[[package]]
+name = "dynasm"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d7d1242462849390bb2ad38aeed769499f1afc7383affa2ab0c1baa894c0200"
+dependencies = [
+ "bitflags",
+ "byteorder",
+ "lazy_static",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "dynasmrt"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c1dd4d1d5ca12258cef339a57a7643e8b233a42dea9bb849630ddd9dd7726aa9"
+dependencies = [
+ "byteorder",
+ "dynasm",
+ "memmap2",
+]
+
 [[package]]
 name = "ecdsa"
 version = "0.10.2"
@@ -511,12 +776,18 @@ checksum = "0a128b76af6dd4b427e34a6fd43dc78dbfe73672ec41ff615a2414c1a0ad0409"
 dependencies = [
  "curve25519-dalek",
  "hex 0.4.3",
- "rand_core",
+ "rand_core 0.5.1",
  "serde",
  "sha2 0.9.3",
  "thiserror",
 ]
 
+[[package]]
+name = "either"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
+
 [[package]]
 name = "elliptic-curve"
 version = "0.8.5"
@@ -530,17 +801,44 @@ dependencies = [
  "generic-array 0.14.4",
  "group",
  "pkcs8",
- "rand_core",
+ "rand_core 0.5.1",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "enumset"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fbd795df6708a599abf1ee10eacc72efd052b7a5f70fdf0715e4d5151a6db9c3"
+dependencies = [
+ "enumset_derive",
+]
+
+[[package]]
+name = "enumset_derive"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e19c52f9ec503c8a68dc04daf71a04b07e690c32ab1a8b68e33897f255269d47"
+dependencies = [
+ "darling",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "fake-simd"
 version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 
+[[package]]
+name = "fallible-iterator"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4443176a9f2c162692bd3d352d745ef9413eec5782a80d8fd6f8a1ac692a07f7"
+
 [[package]]
 name = "ff"
 version = "0.8.0"
@@ -548,10 +846,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "01646e077d4ebda82b73f1bca002ea1e91561a77df2431a9e79729bcc31950ef"
 dependencies = [
  "bitvec",
- "rand_core",
+ "rand_core 0.5.1",
  "subtle",
 ]
 
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
 [[package]]
 name = "funty"
 version = "1.1.0"
@@ -583,11 +887,39 @@ version = "0.1.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8fc3cb4d91f53b50155bdcfd23f6a4c39ae1969c2ae85982b135750cccaf5fce"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
+ "libc",
+ "wasi 0.9.0+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9495705279e7140bf035dde1f6e750c162df8b625267cd52cc44e0b156732c8"
+dependencies = [
+ "cfg-if 1.0.0",
  "libc",
- "wasi",
+ "wasi 0.10.2+wasi-snapshot-preview1",
 ]
 
+[[package]]
+name = "gimli"
+version = "0.22.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aaf91faf136cb47367fa430cd46e37a788775e7fa104f8b4bcb3861dc389b724"
+dependencies = [
+ "fallible-iterator",
+ "indexmap",
+ "stable_deref_trait",
+]
+
+[[package]]
+name = "gimli"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6503fe142514ca4799d4c26297c4248239fe8838d827db6bd6065c6ed29a6ce"
+
 [[package]]
 name = "group"
 version = "0.8.0"
@@ -595,10 +927,25 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cc11f9f5fbf1943b48ae7c2bf6846e7d827a512d1be4f23af708f5ca5d01dde1"
 dependencies = [
  "ff",
- "rand_core",
+ "rand_core 0.5.1",
  "subtle",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7afe4a420e3fe79967a00898cc1f4db7c8a49a9333a29f8a4bd76a253d5cd04"
+
+[[package]]
+name = "hermit-abi"
+version = "0.1.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "322f4de77956e22ed0e5032c359a0f1273f1f7f0d79bfa3b8ffbc730d7fbcc5c"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "hex"
 version = "0.3.2"
@@ -621,6 +968,41 @@ dependencies = [
  "digest 0.9.0",
 ]
 
+[[package]]
+name = "ident_case"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
+
+[[package]]
+name = "indexmap"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fb1fa934250de4de8aef298d81c729a7d33d8c239daa3a7575e6b92bfc7313b"
+dependencies = [
+ "autocfg",
+ "hashbrown",
+ "serde",
+]
+
+[[package]]
+name = "integer-cbrt"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "151bce4481ba7da831c7d12c32353cc79c73bf79732e343b92786e4cbbb2948c"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "integer-sqrt"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "276ec31bcb4a9ee45f58bec6f9ec700ae4cf4f4f8f2fa7e06cb406bd5ffdd770"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "itoa"
 version = "0.4.6"
@@ -633,11 +1015,23 @@ version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf02ecc966e1b7e8db1c81ac8f321ba24d1cfab5b634961fab10111f015858e1"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "ecdsa",
  "elliptic-curve",
 ]
 
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "leb128"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3576a87f2ba00f6f106fdfcd16db1d698d648a26ad8e0573cad8537c3c362d2a"
+
 [[package]]
 name = "libc"
 version = "0.2.87"
@@ -645,57 +1039,177 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "265d751d31d6780a3f956bb5b8022feba2d94eeee5a84ba64f4212eedca42213"
 
 [[package]]
-name = "num-integer"
-version = "0.1.44"
+name = "libloading"
+version = "0.6.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
+checksum = "351a32417a12d5f7e82c368a66781e307834dae04c6ce0cd4456d52989229883"
 dependencies = [
- "autocfg",
- "num-traits",
+ "cfg-if 1.0.0",
+ "winapi",
 ]
 
 [[package]]
-name = "num-traits"
-version = "0.2.14"
+name = "log"
+version = "0.4.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
 dependencies = [
- "autocfg",
+ "cfg-if 1.0.0",
 ]
 
 [[package]]
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+ "object 0.22.0",
+ "thiserror",
+ "wasmer-compiler",
+ "wasmer-types",
+]
+
+[[package]]
+name = "wasmer-types"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7f4ac28c2951cd792c18332f03da523ed06b170f5cf6bb5b1bdd7e36c2a8218"
+dependencies = [
+ "cranelift-entity",
+ "serde",
+ "thiserror",
+]
+
+[[package]]
+name = "wasmer-vm"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7635ba0b6d2fd325f588d69a950ad9fa04dddbf6ad08b6b2a183146319bf6ae"
+dependencies = [
+ "backtrace",
+ "cc",
+ "cfg-if 0.1.10",
+ "indexmap",
+ "libc",
+ "memoffset",
+ "more-asserts",
+ "region",
+ "serde",
+ "thiserror",
+ "wasmer-types",
+ "winapi",
+]
+
+[[package]]
+name = "wasmparser"
+version = "0.65.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87cc2fe6350834b4e528ba0901e7aa405d78b89dc1fa3145359eb4de0e323fcf"
+
+[[package]]
+name = "wast"
+version = "35.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db5ae96da18bb5926341516fd409b5a8ce4e4714da7f0a1063d3b20ac9f9a1e1"
+dependencies = [
+ "leb128",
+]
+
+[[package]]
+name = "wat"
+version = "1.0.36"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b0fa059022c5dabe129f02b429d67086400deb8277f89c975555dacc1dadbcc"
+dependencies = [
+ "wast",
+]
+
+[[package]]
+name = "which"
+version = "4.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87c14ef7e1b8b8ecfc75d5eca37949410046e66f15d185c01d70824f1f8111ef"
+dependencies = [
+ "libc",
+ "thiserror",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "wyz"
 version = "0.2.0"
diff --git a/contracts/cw20-bonding/Cargo.toml b/contracts/cw20-bonding/Cargo.toml
index 7226e43c5..61c5a19df 100644
--- a/contracts/cw20-bonding/Cargo.toml
+++ b/contracts/cw20-bonding/Cargo.toml
@@ -30,7 +30,9 @@ schemars = "0.7"
 serde = { version = "1.0.103", default-features = false, features = ["derive"] }
 thiserror = { version = "1.0.20" }
 rust_decimal = { version = "1.8.1" }
-num-integer = { version = "0.1.44" }
+integer-sqrt = { version = "0.1.5" }
+integer-cbrt = { version = "0.1" }
 
 [dev-dependencies]
 cosmwasm-schema = { version = "0.14.0-alpha2" }
+cosmwasm-vm = { version = "0.14.0-alpha2", features = ["iterator"] }
diff --git a/contracts/cw20-bonding/src/curves.rs b/contracts/cw20-bonding/src/curves.rs
index c95cb9f50..392294023 100644
--- a/contracts/cw20-bonding/src/curves.rs
+++ b/contracts/cw20-bonding/src/curves.rs
@@ -1,4 +1,5 @@
-use num_integer::Roots;
+use integer_cbrt::IntegerCubeRoot;
+use integer_sqrt::IntegerSquareRoot;
 use rust_decimal::prelude::ToPrimitive;
 use rust_decimal::Decimal;
 use schemars::JsonSchema;
@@ -180,7 +181,7 @@ fn square_root(square: Decimal) -> Decimal {
     let extended = extended.floor().to_u128().unwrap();
 
     // take square root, and build a decimal again
-    let root = extended.sqrt();
+    let root = extended.integer_sqrt();
     decimal(root, EXTRA_DIGITS / 2)
 }
 
@@ -196,7 +197,7 @@ fn cube_root(cube: Decimal) -> Decimal {
     let extended = extended.floor().to_u128().unwrap();
 
     // take cube root, and build a decimal again
-    let root = extended.cbrt();
+    let root = extended.integer_cbrt();
     decimal(root, EXTRA_DIGITS / 3)
 }
 
diff --git a/contracts/cw20-bonding/tests/integration.rs b/contracts/cw20-bonding/tests/integration.rs
new file mode 100644
index 000000000..6a9c482fe
--- /dev/null
+++ b/contracts/cw20-bonding/tests/integration.rs
@@ -0,0 +1,58 @@
+//! This integration test tries to run and call the generated wasm.
+//! It depends on a Wasm build being available, which you can create with `cargo wasm`.
+//! Then running `cargo integration-test` will validate we can properly call into that generated Wasm.
+//!
+//! You can easily convert unit tests to integration tests.
+//! 1. First copy them over verbatim,
+//! 2. Then change
+//!      let mut deps = mock_dependencies(20, &[]);
+//!    to
+//!      let mut deps = mock_instance(WASM, &[]);
+//! 3. If you access raw storage, where ever you see something like:
+//!      deps.storage.get(CONFIG_KEY).expect("no data stored");
+//!    replace it with:
+//!      deps.with_storage(|store| {
+//!          let data = store.get(CONFIG_KEY).expect("no data stored");
+//!          //...
+//!      });
+//! 4. Anywhere you see init/execute(deps.as_mut(), ...) you must replace it with init/execute(&mut deps, ...)
+//! 5. Anywhere you see query(deps.as_ref(), ...) you must replace it with query(&mut deps, ...)
+//! (Use cosmwasm_vm::testing::{init, execute, query}, instead of the contract variants).
+
+use cosmwasm_std::Response;
+use cosmwasm_vm::testing::{
+    init, mock_env, mock_info, mock_instance, MockApi, MockQuerier, MockStorage,
+};
+use cosmwasm_vm::Instance;
+
+use cw20_bonding::msg::{CurveType, InitMsg};
+
+// Output of cargo wasm
+static WASM: &[u8] =
+    include_bytes!("../../../target/wasm32-unknown-unknown/release/cw20_bonding.wasm");
+
+const CREATOR: &str = "creator";
+
+fn setup() -> Instance<MockApi, MockStorage, MockQuerier> {
+    let mut deps = mock_instance(WASM, &[]);
+    let msg = InitMsg {
+        name: "works?".to_string(),
+        symbol: "one".to_string(),
+        decimals: 0,
+        reserve_denom: "naught".to_string(),
+        reserve_decimals: 0,
+        curve_type: CurveType::Constant {
+            value: Default::default(),
+            scale: 0,
+        },
+    };
+    let info = mock_info(CREATOR, &[]);
+    let res: Response = init(&mut deps, mock_env(), info, msg).unwrap();
+    assert_eq!(0, res.messages.len());
+    deps
+}
+
+#[test]
+fn init_works() {
+    setup();
+}