diff --git a/contracts/test/EVMPrecompileTest.js b/contracts/test/EVMPrecompileTest.js
index 88450768e6..1786ed566b 100755
--- a/contracts/test/EVMPrecompileTest.js
+++ b/contracts/test/EVMPrecompileTest.js
@@ -4,7 +4,7 @@ const fs = require('fs');
 const path = require('path');
 
 const { expectRevert } = require('@openzeppelin/test-helpers');
-const { setupSigners, getAdmin, deployWasm, storeWasm, execute, isDocker, ABI, createTokenFactoryTokenAndMint, getSeiBalance, rawHttpDebugTraceWithCallTracer} = require("./lib");
+const { setupSigners, getAdmin, deployWasm, storeWasm, execute, isDocker, ABI, createTokenFactoryTokenAndMint, getSeiBalance, rawHttpDebugTraceWithCallTracer, proposeParamChange} = require("./lib");
 
 function sleep(ms) {
     return new Promise((resolve) => setTimeout(resolve, ms));
@@ -125,8 +125,19 @@ describe("EVM Precompile Tester", function () {
         let govProposal;
 
         before(async function () {
-            const govProposalResponse = JSON.parse(await execute(`seid tx gov submit-proposal param-change ../contracts/test/param_change_proposal.json --from admin --fees 20000usei -b block -y -o json`))
-            govProposal = govProposalResponse.logs[0].events[3].attributes[1].value;
+            // Use lib.js proposeParamChange (Autobahn-compatible: -b sync + poll
+            // gov state) instead of an inline `seid tx -b block` which hangs
+            // 60s under Autobahn. Mirrors ../contracts/test/param_change_proposal.json
+            // (kept on disk for any tooling that still consumes it).
+            govProposal = await proposeParamChange(
+                "Gov Param Change",
+                "Update quorum to 0.45",
+                [{ subspace: "gov", key: "tallyparams", value: { quorum: "0.45" } }],
+                "200000000usei",
+                "20000usei",
+                "admin",
+                false, // not expedited — matches the JSON file
+            );
 
             const signer = accounts[0].signer
             const contractABIPath = '../../precompiles/gov/abi.json';
diff --git a/contracts/test/lib.js b/contracts/test/lib.js
index 83655dc40d..4e9681ab55 100644
--- a/contracts/test/lib.js
+++ b/contracts/test/lib.js
@@ -77,6 +77,24 @@ async function delay() {
     await sleep(1000)
 }
 
+// Wait until the chain advances by `blocks` blocks. Used after `-b sync`
+// submissions to give the chain time to include the tx — engine-agnostic
+// substitute for a fixed sleep, since block times differ between CometBFT
+// (~1s) and Autobahn (~100ms). Default is 2 blocks rather than 1 because
+// the next block can be empty (the submitted tx is still in mempool and
+// lands one block later); 2 blocks closes that race in nearly all cases
+// without re-introducing a fixed sleep.
+async function waitForBlocks(blocks=2, timeoutMs=15000) {
+    const start = await ethers.provider.getBlockNumber()
+    const deadline = Date.now() + timeoutMs
+    while (Date.now() < deadline) {
+        const cur = await ethers.provider.getBlockNumber()
+        if (cur >= start + blocks) return
+        await sleep(50)
+    }
+    throw new Error(`block didn't advance by ${blocks} in ${timeoutMs}ms (start=${start})`)
+}
+
 async function getCosmosTx(provider, evmTxHash) {
     return await provider.send("sei_getCosmosTx", [evmTxHash])
 }
@@ -92,18 +110,25 @@ async function fundAddress(addr, amount="1000000000000000000000") {
 }
 
 async function evmSend(addr, fromKey, amount="10000000000000000000000000") {
-    const output = await execute(`seid tx evm send ${addr} ${amount} --from ${fromKey} -b block -y`);
+    // -b sync (returns on mempool acceptance) instead of -b block (subscribes
+    // to EventDataTx). Under Autobahn, executeBlock doesn't fire EventDataTx,
+    // so -b block hangs to its 60s timeout. -b sync is sufficient because
+    // callers don't read the deliver_tx event payload from this output.
+    const output = await execute(`seid tx evm send ${addr} ${amount} --from ${fromKey} -b sync -y`);
+    await waitForBlocks()
     return output.replace(/.*0x/, "0x").trim()
 }
 
 async function bankSend(toAddr, fromKey, amount="100000000000", denom="usei") {
-    const result = await execute(`seid tx bank send ${fromKey} ${toAddr} ${amount}${denom} -b block --fees 20000usei -y`);
-    await delay()
+    const result = await execute(`seid tx bank send ${fromKey} ${toAddr} ${amount}${denom} -b sync --fees 20000usei -y`);
+    await waitForBlocks()
     return result
 }
 
 async function fundSeiAddress(seiAddr, amount="100000000000", denom="usei", funder=adminKeyName) {
-    return await execute(`seid tx bank send ${funder} ${seiAddr} ${amount}${denom} -b block --fees 20000usei -y`);
+    const result = await execute(`seid tx bank send ${funder} ${seiAddr} ${amount}${denom} -b sync --fees 20000usei -y`);
+    await waitForBlocks()
+    return result
 }
 
 async function getSeiBalance(seiAddr, denom="usei") {
@@ -155,8 +180,8 @@ async function getKeySeiAddress(name) {
 
 async function associateKey(keyName) {
     try {
-        await execute(`seid tx evm associate-address --from ${keyName} -b block`)
-        await delay()
+        await execute(`seid tx evm associate-address --from ${keyName} -b sync`)
+        await waitForBlocks()
     }catch(e){
         console.log("skipping associate")
     }
@@ -219,16 +244,36 @@ async function rawHttpDebugTraceWithCallTracer(txHash) {
 }
 
 async function createTokenFactoryTokenAndMint(name, amount, recipient, from=adminKeyName) {
-    const command = `seid tx tokenfactory create-denom ${name} --from ${from} --gas=5000000 --fees=1000000usei -y --broadcast-mode block -o json`
-    const output = await execute(command);
-    const response = JSON.parse(output)
-    const token_denom = getEventAttribute(response, "create_denom", "new_token_denom")
-    const mint_command = `seid tx tokenfactory mint ${amount}${token_denom} --from ${from} --gas=5000000 --fees=1000000usei -y --broadcast-mode block -o json`
-    await execute(mint_command);
+    // -b sync everywhere (no -b block hang under Autobahn). The tokenfactory
+    // denom format is factory/<creator-bech32>/<subdenom>, so we construct
+    // the denom locally from the from-key's address rather than reading
+    // the create_denom event from the tx response — -b sync doesn't carry
+    // deliver_tx events.
+    const creator = await getKeySeiAddress(from);
+    const token_denom = `factory/${creator}/${name}`;
+
+    const createOut = await execute(`seid tx tokenfactory create-denom ${name} --from ${from} --gas=5000000 --fees=1000000usei -y --broadcast-mode sync -o json`);
+    const createResp = JSON.parse(createOut);
+    if (createResp.code !== 0) {
+        throw new Error(`createTokenFactoryTokenAndMint: create-denom rejected: ${createResp.raw_log}`);
+    }
+    await waitForBlocks();
+
+    const mintOut = await execute(`seid tx tokenfactory mint ${amount}${token_denom} --from ${from} --gas=5000000 --fees=1000000usei -y --broadcast-mode sync -o json`);
+    const mintResp = JSON.parse(mintOut);
+    if (mintResp.code !== 0) {
+        throw new Error(`createTokenFactoryTokenAndMint: mint rejected: ${mintResp.raw_log}`);
+    }
+    await waitForBlocks();
+
+    const sendOut = await execute(`seid tx bank send ${from} ${recipient} ${amount}${token_denom} --from ${from} --gas=5000000 --fees=1000000usei -y --broadcast-mode sync -o json`);
+    const sendResp = JSON.parse(sendOut);
+    if (sendResp.code !== 0) {
+        throw new Error(`createTokenFactoryTokenAndMint: bank send rejected: ${sendResp.raw_log}`);
+    }
+    await waitForBlocks();
 
-    const send_command = `seid tx bank send ${from} ${recipient} ${amount}${token_denom} --from ${from} --gas=5000000 --fees=1000000usei -y --broadcast-mode block -o json`
-    await execute(send_command);
-    return token_denom
+    return token_denom;
 }
 
 async function getChainId() {
@@ -402,19 +447,59 @@ async function proposeParamChange(title, description, changes, deposit="20000000
     };
     const proposalJson = JSON.stringify(proposal);
     const tempFile = `/tmp/param_change_${Date.now()}.json`;
-    
+
     // Use base64 encoding to avoid quote escaping issues in Docker
     const base64Json = Buffer.from(proposalJson).toString('base64');
     await execute(`echo ${base64Json} | base64 -d > ${tempFile}`);
-    
-    const command = `seid tx gov submit-proposal param-change ${tempFile} --from ${from} --fees ${fees} -y -o json --broadcast-mode=block`;
+
+    // Snapshot max proposal id before submit so we can identify the new one
+    // by polling — see comment below for why we don't use the tx response.
+    const maxIdBefore = await maxProposalId();
+
+    // -b sync (returns on mempool acceptance) instead of -b block (subscribes
+    // to EventDataTx). Under Autobahn, executeBlock doesn't fire EventDataTx,
+    // so -b block hangs to its 60s timeout on every call. -b sync also means
+    // the tx response no longer carries the deliver_tx events — including the
+    // submit_proposal event we used to read proposal_id from — so we instead
+    // poll gov state until a new proposal appears.
+    const command = `seid tx gov submit-proposal param-change ${tempFile} --from ${from} --fees ${fees} -y -o json -b sync`;
     const output = await execute(command);
     await execute(`rm ${tempFile}`);
     const response = JSON.parse(output);
     if (response.code !== 0) {
         throw new Error(`Failed to submit proposal: ${response.raw_log}`);
     }
-    return getEventAttribute(response, "submit_proposal", "proposal_id");
+
+    // Poll for the new proposal to land. Tx hash lookup (`seid q tx <hash>`)
+    // would need a Cosmos-side tx indexer, which Autobahn doesn't run.
+    // 30s should comfortably cover the inclusion + commit window.
+    const deadline = Date.now() + 30000;
+    while (Date.now() < deadline) {
+        const cur = await maxProposalId();
+        if (cur > maxIdBefore) return String(cur);
+        await sleep(250);
+    }
+    throw new Error(`proposal submitted (tx ${response.txhash}) but did not appear in gov state within 30s`);
+}
+
+// Returns the highest existing proposal id, or 0 if there are no proposals.
+async function maxProposalId() {
+    let out;
+    try {
+        // seid exits non-zero with "Error: no proposals found" on an empty
+        // gov set; treat that as id=0 and fall through to JSON parsing for
+        // the populated case. Avoid using a `|| echo` fallback inside the
+        // pipeline because the docker-exec wrapper double-quotes the inner
+        // command and a JSON literal with single quotes would terminate
+        // the outer quote region.
+        out = await execute(`seid q gov proposals --reverse --limit 1 -o json 2>/dev/null`);
+    } catch (e) {
+        return 0;
+    }
+    if (!out || !out.trim()) return 0;
+    const proposals = JSON.parse(out).proposals || [];
+    if (proposals.length === 0) return 0;
+    return Number(proposals[0].proposal_id || proposals[0].id);
 }
 
 async function proposeDisableWasm(title="Disable WASM", description="Disable cosmwasm store code and instantiate operations", deposit="200000000usei", fees="200000usei", from=adminKeyName) {
@@ -498,9 +583,9 @@ async function ensureWasmDisabled(from=adminKeyName) {
 
 async function passProposal(proposalId,  desposit="200000000usei", fees="200000usei", from=adminKeyName) {
     if(await isDocker()) {
-        await executeOnAllNodes(`seid tx gov vote ${proposalId} yes --from node_admin -b block -y --fees ${fees}`)
+        await executeOnAllNodes(`seid tx gov vote ${proposalId} yes --from node_admin -b sync -y --fees ${fees}`)
     } else {
-        await execute(`seid tx gov vote ${proposalId} yes --from ${from} -b block -y --fees ${fees}`)
+        await execute(`seid tx gov vote ${proposalId} yes --from ${from} -b sync -y --fees ${fees}`)
     }
     // Poll for proposal status with shorter delay for faster tests
     for(let i=0; i<200; i++) {