diff --git a/Cargo.lock b/Cargo.lock
index 72990a1..d69da4e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -35,6 +35,12 @@ version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
 
+[[package]]
+name = "base64"
+version = "0.21.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567"
+
 [[package]]
 name = "base64"
 version = "0.22.1"
@@ -49,9 +55,9 @@ checksum = "79296716171880943b8470b5f8d03aa55eb2e645a4874bdbb28adb49162e012c"
 
 [[package]]
 name = "cc"
-version = "1.0.98"
+version = "1.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41c270e7540d725e65ac7f1b212ac8ce349719624d7bcff99f8e2e488e8cf03f"
+checksum = "324c74f2155653c90b04f25b2a47a8a631360cb908f92a772695f430c7e31052"
 
 [[package]]
 name = "cfg-if"
@@ -101,9 +107,9 @@ dependencies = [
 
 [[package]]
 name = "darling"
-version = "0.20.9"
+version = "0.20.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83b2eb4d90d12bdda5ed17de686c2acb4c57914f8f921b8da7e112b5a36f3fe1"
+checksum = "6f63b86c8a8826a49b8c21f08a2d07338eec8d900540f8630dc76284be802989"
 dependencies = [
  "darling_core",
  "darling_macro",
@@ -111,9 +117,9 @@ dependencies = [
 
 [[package]]
 name = "darling_core"
-version = "0.20.9"
+version = "0.20.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "622687fe0bac72a04e5599029151f5796111b90f1baaa9b544d807a5e31cd120"
+checksum = "95133861a8032aaea082871032f5815eb9e98cef03fa916ab4500513994df9e5"
 dependencies = [
  "fnv",
  "ident_case",
@@ -125,9 +131,9 @@ dependencies = [
 
 [[package]]
 name = "darling_macro"
-version = "0.20.9"
+version = "0.20.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "733cabb43482b1a1b53eee8583c2b9e8684d592215ea83efd305dd31bc2f0178"
+checksum = "d336a2a514f6ccccaa3e09b02d41d35330c07ddf03a62165fcec10bb561c7806"
 dependencies = [
  "darling_core",
  "quote",
@@ -150,6 +156,12 @@ version = "1.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0d6ef0072f8a535281e4876be788938b528e9a1d43900b82c2569af7da799125"
 
+[[package]]
+name = "either"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
+
 [[package]]
 name = "equivalent"
 version = "1.0.1"
@@ -162,6 +174,12 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2bfcf67fea2815c2fc3b90873fae90957be12ff417335dfadc7f52927feb03b2"
 
+[[package]]
+name = "ethnum"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b90ca2580b73ab6a1f724b76ca11ab632df820fd6040c336200d2c1df7b3c82c"
+
 [[package]]
 name = "fnv"
 version = "1.0.7"
@@ -240,6 +258,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "1.0.11"
@@ -263,9 +290,9 @@ checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
 
 [[package]]
 name = "log"
-version = "0.4.21"
+version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90ed8c1e510134f979dbc4f070f87d4313098b704861a105fe34231c70a3901c"
+checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
 [[package]]
 name = "num-conv"
@@ -296,9 +323,9 @@ checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.84"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec96c6a92621310b51366f1e28d05ef11489516e93be030060e5fc12024a49d6"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
 dependencies = [
  "unicode-ident",
 ]
@@ -348,20 +375,26 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e1cf6437eb19a8f4a6cc0f7dca544973b0b78843adbfeb3683d1a94a0024a294"
 
+[[package]]
+name = "semver"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61697e0a1c7e512e84a621326239844a24d8207b4669b41bc18b32ea5cbf988b"
+
 [[package]]
 name = "serde"
-version = "1.0.203"
+version = "1.0.204"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7253ab4de971e72fb7be983802300c30b5a7f0c2e56fab8abfc6a214307c0094"
+checksum = "bc76f558e0cbb2a839d37354c575f1dc3fdc6546b5be373ba43d95f231bf7c12"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.203"
+version = "1.0.204"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "500cbc0ebeb6f46627f50f3f5811ccf6bf00643be300b4c3eabc0ef55dc5b5ba"
+checksum = "e0cd7e117be63d3c3678776753929474f3b04a43a080c744d6b0ae2a8c28e222"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -381,9 +414,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.117"
+version = "1.0.120"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "455182ea6142b14f93f4bc5320a2b31c1f266b66a4a5c858b013302a5d8cbfc3"
+checksum = "4e0d21c9a8cae1235ad58a00c11cb40d4b1e5c784f1ef2c537876ed6ffd8b7c5"
 dependencies = [
  "itoa",
  "ryu",
@@ -392,9 +425,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with"
-version = "3.8.1"
+version = "3.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ad483d2ab0149d5a5ebcd9972a3852711e0153d863bf5a5d0391d28883c4a20"
+checksum = "69cecfa94848272156ea67b2b1a53f20fc7bc638c4a46d2f8abde08f05f4b857"
 dependencies = [
  "base64 0.22.1",
  "chrono",
@@ -410,9 +443,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with_macros"
-version = "3.8.1"
+version = "3.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "65569b702f41443e8bc8bbb1c5779bd0450bbe723b56198980e80ec45780bce2"
+checksum = "a8fee4991ef4f274617a51ad4af30519438dacb2f56ac773b08a1922ff743350"
 dependencies = [
  "darling",
  "proc-macro2",
@@ -420,6 +453,34 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "soroban-spec"
+version = "21.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5c72bb3677167ba79c8f0f307b3a5b6469c40fd3ff01599298b3eff5c3f6e19"
+dependencies = [
+ "base64 0.13.1",
+ "stellar-xdr",
+ "thiserror",
+ "wasmparser 0.116.1",
+]
+
+[[package]]
+name = "soroban-spec-tools"
+version = "21.1.1"
+dependencies = [
+ "base64 0.21.7",
+ "ethnum",
+ "hex",
+ "itertools",
+ "serde_json",
+ "soroban-spec",
+ "stellar-strkey",
+ "stellar-xdr",
+ "thiserror",
+ "wasmparser 0.90.0",
+]
+
 [[package]]
 name = "stellar-strkey"
 version = "0.0.8"
@@ -433,8 +494,9 @@ dependencies = [
 
 [[package]]
 name = "stellar-xdr"
-version = "21.0.1"
-source = "git+https://github.com/stellar/rs-stellar-xdr?rev=89a8bcde36aeda551cb0e3f9aa3e9fcf315fe1cc#89a8bcde36aeda551cb0e3f9aa3e9fcf315fe1cc"
+version = "21.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec43c9c5ae7ec7b6ac9e263b6d5b9e3781aa05ba3a1c05f6e70701c5c6600665"
 dependencies = [
  "base64 0.13.1",
  "crate-git-revision",
@@ -454,6 +516,7 @@ dependencies = [
  "console_error_panic_hook",
  "schemars",
  "serde_json",
+ "soroban-spec-tools",
  "stellar-xdr",
  "wasm-bindgen",
  "wasm-bindgen-test",
@@ -467,9 +530,9 @@ checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
 [[package]]
 name = "syn"
-version = "2.0.66"
+version = "2.0.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c42f3f41a2de00b01c0aaad383c5a45241efc8b2d1eda5661812fda5f3cdcff5"
+checksum = "b146dcf730474b4bcd16c311627b31ede9ab149045db4d6088b3becaea046462"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -478,18 +541,18 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.61"
+version = "1.0.62"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c546c80d6be4bc6a00c0f01730c08df82eaa7a7a61f11d656526506112cc1709"
+checksum = "f2675633b1499176c2dff06b0856a27976a8f9d436737b4cf4f312d4d91d8bbb"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.61"
+version = "1.0.62"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46c3384250002a6d5af4d114f2845d37b57521033f30d5c3f46c4d70e1197533"
+checksum = "d20468752b09f49e909e55a5d338caa8bedf615594e9d80bc4c565d30faf798c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -624,6 +687,25 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "wasmparser"
+version = "0.90.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b62c8d843f4423efee314dc75a1049886deba3214f7e7f9ff0e4e58b4d618581"
+dependencies = [
+ "indexmap 1.9.3",
+]
+
+[[package]]
+name = "wasmparser"
+version = "0.116.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a58e28b80dd8340cb07b8242ae654756161f6fc8d0038123d679b7b99964fa50"
+dependencies = [
+ "indexmap 2.2.6",
+ "semver",
+]
+
 [[package]]
 name = "web-sys"
 version = "0.3.69"
@@ -645,9 +727,9 @@ dependencies = [
 
 [[package]]
 name = "windows-targets"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
 dependencies = [
  "windows_aarch64_gnullvm",
  "windows_aarch64_msvc",
@@ -661,48 +743,48 @@ dependencies = [
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
 
 [[package]]
 name = "windows_i686_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.52.5"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
diff --git a/Cargo.toml b/Cargo.toml
index 80949a8..e512f13 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,10 +20,14 @@ console_error_panic_hook = { version = "0.1.7", optional = true }
 # serde-wasm-bindgen = "0.6.5"
 
 [dependencies.stellar-xdr]
-version = "21.0.1"
+version = "21.1.0"
 features = ["std", "curr", "base64", "serde", "serde_json", "schemars"]
-git = "https://github.com/stellar/rs-stellar-xdr"
-rev = "89a8bcde36aeda551cb0e3f9aa3e9fcf315fe1cc"
+
+
+[dependencies.soroban-spec-tools]
+# path = "../soroban-tools/cmd/crates/soroban-spec-tools/"
+rev = "c5729737c7dfc122852a707d4e6d9311b9b7be74"
+git = "https://github.com/ahalabs/stellar-cli"
 
 [dev-dependencies]
 wasm-bindgen-test = "0.3.34"
diff --git a/src/lib.rs b/src/lib.rs
index f752c6d..7ba7de7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,8 +1,11 @@
 mod console_error_panic_hook;
 
 use schemars::gen::SchemaSettings;
+use soroban_spec_tools::Spec;
 use std::str::FromStr;
-use stellar_xdr::curr::{Limits, Type, TypeVariant, WriteXdr};
+use stellar_xdr::curr::{
+    InvokeContractArgs, Limits, ReadXdr, ScAddress, ScVal, Type, TypeVariant, WriteXdr,
+};
 use wasm_bindgen::prelude::*;
 
 /// Returns a list of XDR types.
@@ -76,3 +79,64 @@ pub fn encode(type_variant: String, json: String) -> Result<String, String> {
         .map_err(|e| format!("{e}"))?;
     Ok(b64)
 }
+
+/// Given a spec, function name, and JSON arguments, returns the XDR base64 encoding of the arguments.
+pub fn func_input_to_xdr(
+    spec_base64: String,
+    contract_address: String,
+    name: String,
+    args_json: String,
+) -> Result<String, String> {
+    let spec = Spec::parse_base64(&spec_base64).map_err(|e| format!("{e}"))?;
+    let func = spec.find_function(&name).map_err(|e| format!("{e}"))?;
+    let contract_address = ScAddress::from_xdr_base64(contract_address, Limits::none()).unwrap();
+    let json_args: serde_json::Value =
+        serde_json::from_str(&args_json).map_err(|e| format!("{e}"))?;
+    let args = func
+        .inputs
+        .iter()
+        .map(|arg| {
+            let name = arg.name.to_utf8_string().unwrap();
+            let json_arg = json_args
+                .get(&name)
+                .ok_or_else(|| format!("missing argument: {name}"))?;
+            spec.from_json(json_arg, &arg.type_)
+                .map_err(|e| format!("{e}"))
+        })
+        .collect::<Result<Vec<_>, String>>()?;
+    InvokeContractArgs {
+        contract_address,
+        args: args.try_into().unwrap(),
+        function_name: name.try_into().unwrap(),
+    }
+    .to_xdr_base64(Limits::none())
+    .map_err(|e| format!("{e}"))
+}
+/// Given a spec, function name, and base64 XDR result, returns the JSON encoded String of the result.
+pub fn func_res_from_xdr(
+    spec_base64: String,
+    name: String,
+    res_base64: String,
+) -> Result<String, String> {
+    let spec = Spec::parse_base64(&spec_base64).map_err(|e| format!("{e}"))?;
+    let output = spec
+        .find_function(&name)
+        .map_err(|e| format!("{e}"))?
+        .outputs
+        .first()
+        .unwrap();
+    Ok(spec
+        .xdr_to_json(
+            &ScVal::from_xdr_base64(res_base64, Limits::none()).unwrap(),
+            output,
+        )
+        .unwrap()
+        .to_string())
+}
+
+/// Given a spec, Return the JSON schema for the contract
+pub fn contract_schema(spec_base64: String) -> Result<String, String> {
+    let spec = Spec::parse_base64(&spec_base64).map_err(|e| format!("{e}"))?;
+    let json_schema = spec.to_json_schema().map_err(|e| format!("{e}"))?;
+    Ok(json_schema.to_string())
+}