diff --git a/packages/chain/src/evm-adapter-errors.ts b/packages/chain/src/evm-adapter-errors.ts
index 402a572c03..67d6eb2fab 100644
--- a/packages/chain/src/evm-adapter-errors.ts
+++ b/packages/chain/src/evm-adapter-errors.ts
@@ -3,7 +3,7 @@
 /**
  * EVM error decoding / classification helpers extracted from
  * evm-adapter.ts. Covers low-level error-shape extraction
- * (`errorMessage` / `errorCode` / `errorStatus`), custom-error ABI
+ * (`errorMessage` / `errorName` / `errorCode` / `errorStatus`), custom-error ABI
  * decoding (`decodeEvmError` / `enrichEvmError` and the lazily-cached
  * error/PCA interfaces), the Hub-stale revert markers, and the
  * `TooLowAllowance` classifier. Bodies are a 1:1 move from the original
@@ -22,6 +22,18 @@ export function errorMessage(err: unknown): string {
   try { return JSON.stringify(err); } catch { return String(err); }
 }
 
+/**
+ * Read the top-level error class name exposed by Error / DOMException shapes.
+ * Unlike status and code extraction, this deliberately does not traverse
+ * wrappers: a name describes the caught surface error, while nested transport
+ * metadata is decoded separately by {@link errorCode} / {@link errorStatus}.
+ */
+export function errorName(err: unknown): string {
+  if (!err || typeof err !== 'object') return '';
+  const { name } = err as { name?: unknown };
+  return typeof name === 'string' ? name : '';
+}
+
 export function errorCode(err: unknown): string {
   return String((err as any)?.code ?? (err as any)?.error?.code ?? '').toUpperCase();
 }
diff --git a/packages/chain/src/evm-adapter-rpc.ts b/packages/chain/src/evm-adapter-rpc.ts
index d2fe2b9042..567c1609d7 100644
--- a/packages/chain/src/evm-adapter-rpc.ts
+++ b/packages/chain/src/evm-adapter-rpc.ts
@@ -8,7 +8,13 @@
  * assertions. Bodies are a 1:1 move from the original module.
  */
 import { ethers, FetchRequest } from 'ethers';
-import { enrichEvmError, errorCode, errorMessage, errorStatus } from './evm-adapter-errors.js';
+import {
+  enrichEvmError,
+  errorCode,
+  errorMessage,
+  errorName,
+  errorStatus,
+} from './evm-adapter-errors.js';
 import { createRpcTimeoutError } from './chain-rpc-transport-error.js';
 
 /**
@@ -118,6 +124,7 @@ export function isRetryableRpcError(err: unknown): boolean {
   const code = errorCode(err);
   const status = errorStatus(err);
   const msg = errorMessage(err).toLowerCase();
+  const name = errorName(err);
 
   if (code === 'CALL_EXCEPTION' || code === 'INSUFFICIENT_FUNDS' || code === 'NONCE_EXPIRED'
     || code === 'RPC_RECEIPT_LOOKUP_FAILED'
@@ -132,6 +139,16 @@ export function isRetryableRpcError(err: unknown): boolean {
     return false;
   }
 
+  // Node/undici/ethers surface an aborted fetch as DOMException
+  // `{ name: 'AbortError' }` (and some Node paths also stamp `ABORT_ERR`).
+  // At the chain-RPC boundary this is a transport interruption, not a
+  // deterministic EVM result. Treat it like the timeout/network cases below so
+  // the SAME signed transaction or point read fails over to another endpoint.
+  // This is especially important after `eth_sendRawTransaction`: an RPC can
+  // accept the tx and then abort the client response, so fail-fast would report
+  // publish failure even though the mint is already on chain.
+  if (name === 'AbortError' || code === 'ABORT_ERR') return true;
+
   if (status === 429 || (typeof status === 'number' && status >= 500)) return true;
   if (code === 'TIMEOUT' || code === 'RPC_TIMEOUT' || code === 'TIMEOUT_ERROR' || code === 'SERVER_ERROR'
     || code === 'NETWORK_ERROR' || code === 'ECONNRESET' || code === 'ECONNREFUSED'
diff --git a/packages/chain/src/rpc-failover-client.ts b/packages/chain/src/rpc-failover-client.ts
index 3083c51f53..5e0dda69ef 100644
--- a/packages/chain/src/rpc-failover-client.ts
+++ b/packages/chain/src/rpc-failover-client.ts
@@ -607,7 +607,7 @@ export class RpcFailoverClient {
           throw new ChainRpcTransportError(
             'RPC_ENDPOINTS_EXHAUSTED',
             `${label} broadcast failed on all configured RPC endpoints for tx ${txHash}: ${errorMessage(lastRetryable)}`,
-            { cause: lastRetryable, rpcUrls: canonical.map((e) => e.rpcUrl) },
+            { cause: lastRetryable, rpcUrls: canonical.map((e) => e.rpcUrl), txHash },
           );
         } finally {
           metrics.chainRpcDuration.record(Date.now() - startedAt, {
diff --git a/packages/chain/test/evm-adapter-tip-read-carveouts.unit.test.ts b/packages/chain/test/evm-adapter-tip-read-carveouts.unit.test.ts
index 6b2e2f737c..f702b37bdc 100644
--- a/packages/chain/test/evm-adapter-tip-read-carveouts.unit.test.ts
+++ b/packages/chain/test/evm-adapter-tip-read-carveouts.unit.test.ts
@@ -154,6 +154,18 @@ describe('getBlockTimestamp: a null (unimported) receipt block fails over instea
     expect(backupGetBlock.calls).toHaveLength(1);
   });
 
+  it('primary aborts the receipt-block request → fails over to the backup timestamp', async () => {
+    const abort = new Error('This operation was aborted');
+    abort.name = 'AbortError';
+    const primaryGetBlock = recorder(async () => { throw abort; });
+    const backupGetBlock = recorder(async () => ({ timestamp: 42 }));
+    const a = makeTwoEndpointAdapter({ getBlock: primaryGetBlock }, { getBlock: backupGetBlock });
+
+    await expect(a.getBlockTimestamp(123n)).resolves.toBe(42);
+    expect(primaryGetBlock.calls).toHaveLength(1);
+    expect(backupGetBlock.calls).toHaveLength(1);
+  });
+
   it('all endpoints lack the block → best-effort 0 (callers tolerate it)', async () => {
     const a = makeTwoEndpointAdapter({ getBlock: recorder(async () => null) }, { getBlock: recorder(async () => null) });
     expect(await a.getBlockTimestamp(123n)).toBe(0);
diff --git a/packages/chain/test/rpc-failover-client.unit.test.ts b/packages/chain/test/rpc-failover-client.unit.test.ts
index 00784b3938..01a3045260 100644
--- a/packages/chain/test/rpc-failover-client.unit.test.ts
+++ b/packages/chain/test/rpc-failover-client.unit.test.ts
@@ -53,6 +53,15 @@ const badDataError = () => {
   return e;
 };
 const knownTxError = () => new Error('already known');
+const abortedRpcError = () => {
+  const error = new Error('This operation was aborted');
+  error.name = 'AbortError';
+  return error;
+};
+const abortedRpcCodeError = () => Object.assign(
+  new Error('request aborted'),
+  { code: 'ABORT_ERR' },
+);
 
 const URLS = ['https://primary.example', 'https://backup.example'];
 
@@ -210,6 +219,16 @@ describe('RpcFailoverClient.read / readContract — policy matrix applied + view
     ).resolves.toBe('BACKUP');
     expect(backupView.calls).toHaveLength(1);
   });
+
+  it('read: an AbortError is a retryable transport interruption and fails over', async () => {
+    const primary = { read: recorder(async () => { throw abortedRpcError(); }) };
+    const backup = { read: recorder(async () => 'BACKUP') };
+    const client = makeClient([primary, backup], URLS);
+
+    await expect(client.read('aborted point read', (p: any) => p.read())).resolves.toBe('BACKUP');
+    expect(primary.read.calls).toHaveLength(1);
+    expect(backup.read.calls).toHaveLength(1);
+  });
 });
 
 // ── broadcast (write transport) ──────────────────────────────────────────────
@@ -245,6 +264,7 @@ describe('RpcFailoverClient.broadcast — idempotent short-circuit + typed exhau
     try { await client.broadcast('0xsigned', '0xDEADBEEF', 'unit write'); } catch (e) { thrown = e; }
     expect(thrown.code).toBe('RPC_ENDPOINTS_EXHAUSTED'); // #1329: maps to a retryable 503, not a code-less 500
     expect(thrown.rpcUrls).toEqual(URLS);
+    expect(thrown.txHash).toBe('0xDEADBEEF');
     expect(thrown.message).toContain('0xDEADBEEF'); // names the tx
     expect(thrown.message).not.toContain('https://'); // never a full URL
     expect(primary.broadcastTransaction.calls).toHaveLength(1);
@@ -260,6 +280,30 @@ describe('RpcFailoverClient.broadcast — idempotent short-circuit + typed exhau
     await expect(client.broadcast('0xsigned', '0xhash', 'unit write')).rejects.toBe(err);
     expect(backup.broadcastTransaction.calls).toEqual([]);
   });
+
+  it('an AbortError after submit is ambiguous, so the byte-identical signed tx fails over', async () => {
+    const primary = { broadcastTransaction: recorder(async () => { throw abortedRpcError(); }) };
+    const backup = { broadcastTransaction: recorder(async () => undefined) };
+    const client = makeClient([primary, backup], URLS);
+
+    await expect(client.broadcast('0xsigned', '0xhash', 'unit write')).resolves.toBeUndefined();
+    expect(primary.broadcastTransaction.calls).toHaveLength(1);
+    expect(backup.broadcastTransaction.calls).toHaveLength(1);
+    expect(primary.broadcastTransaction.calls[0][0]).toBe('0xsigned');
+    expect(backup.broadcastTransaction.calls[0][0]).toBe('0xsigned');
+  });
+
+  it('a code-only ABORT_ERR after submit also fails over with the byte-identical signed tx', async () => {
+    const primary = { broadcastTransaction: recorder(async () => { throw abortedRpcCodeError(); }) };
+    const backup = { broadcastTransaction: recorder(async () => undefined) };
+    const client = makeClient([primary, backup], URLS);
+
+    await expect(client.broadcast('0xsigned', '0xhash', 'unit write')).resolves.toBeUndefined();
+    expect(primary.broadcastTransaction.calls).toHaveLength(1);
+    expect(backup.broadcastTransaction.calls).toHaveLength(1);
+    expect(primary.broadcastTransaction.calls[0][0]).toBe('0xsigned');
+    expect(backup.broadcastTransaction.calls[0][0]).toBe('0xsigned');
+  });
 });
 
 // ── getReceipt (write transport) ─────────────────────────────────────────────
diff --git a/packages/cli/src/daemon/http-utils.ts b/packages/cli/src/daemon/http-utils.ts
index 898bf41359..1504db1309 100644
--- a/packages/cli/src/daemon/http-utils.ts
+++ b/packages/cli/src/daemon/http-utils.ts
@@ -284,20 +284,27 @@ export function classifyChainRpcTransportStatus(
   const { code } = err;
   const msg = sanitizeRpcMessage(typeof err.message === "string" ? err.message : "");
   const txHash = typeof err.txHash === "string" && err.txHash ? err.txHash : "";
+  const transportBody = (error: string, responseCode: string): Record<string, unknown> => ({
+    error,
+    code: responseCode,
+    ...(txHash ? { txHash } : {}),
+  });
   // Exhaustive over ChainRpcTransportCode: a new code added to the boundary
   // without a case here is a COMPILE error (the `never` default), so the
   // classifier can never silently inherit timeout/504 semantics for a new code.
   switch (code) {
     case "RPC_ENDPOINTS_EXHAUSTED":
-      return { status: 503, body: { error: msg || "Configured chain RPC endpoints were exhausted.", code } };
+      return {
+        status: 503,
+        body: transportBody(msg || "Configured chain RPC endpoints were exhausted.", code),
+      };
     case "RPC_RECEIPT_LOOKUP_FAILED":
       return {
         status: 503,
-        body: {
-          error: msg || "Transaction receipt lookup failed on all configured chain RPC endpoints.",
+        body: transportBody(
+          msg || "Transaction receipt lookup failed on all configured chain RPC endpoints.",
           code,
-          ...(txHash ? { txHash } : {}),
-        },
+        ),
       };
     case "RPC_TIMEOUT":
       // Internal, chain-namespaced timeout code. Expose the public/legacy
@@ -305,7 +312,7 @@ export function classifyChainRpcTransportStatus(
       // wire contract stable while the boundary stays namespaced internally.
       return {
         status: 504,
-        body: { error: msg || "Chain transaction timed out.", code: "TIMEOUT", ...(txHash ? { txHash } : {}) },
+        body: transportBody(msg || "Chain transaction timed out.", "TIMEOUT"),
       };
     default: {
       const _exhaustive: never = code;
diff --git a/packages/cli/test/chain-rpc-transport-status.test.ts b/packages/cli/test/chain-rpc-transport-status.test.ts
index 3c753b65dc..808d86eac1 100644
--- a/packages/cli/test/chain-rpc-transport-status.test.ts
+++ b/packages/cli/test/chain-rpc-transport-status.test.ts
@@ -11,6 +11,16 @@ describe('classifyChainRpcTransportStatus (W2 shared transport-status helper)',
     ).toEqual({ status: 503, body: { error: 'all endpoints failed', code: 'RPC_ENDPOINTS_EXHAUSTED' } });
   });
 
+  it('preserves the known txHash on a broadcast RPC_ENDPOINTS_EXHAUSTED response', () => {
+    const r = classifyChainRpcTransportStatus({
+      code: 'RPC_ENDPOINTS_EXHAUSTED',
+      message: 'broadcast endpoints failed',
+      txHash: '0xabc',
+    });
+    expect(r?.status).toBe(503);
+    expect(r?.body).toMatchObject({ code: 'RPC_ENDPOINTS_EXHAUSTED', txHash: '0xabc' });
+  });
+
   it('maps RPC_RECEIPT_LOOKUP_FAILED -> 503 (+code, +txHash)', () => {
     const r = classifyChainRpcTransportStatus({ code: 'RPC_RECEIPT_LOOKUP_FAILED', message: 'm', txHash: '0xabc' });
     expect(r?.status).toBe(503);
diff --git a/packages/cli/vitest.unit.config.ts b/packages/cli/vitest.unit.config.ts
index 1b11d0d923..feef9100f7 100644
--- a/packages/cli/vitest.unit.config.ts
+++ b/packages/cli/vitest.unit.config.ts
@@ -65,6 +65,9 @@ export default defineConfig({
           'test/promote-async-routes.test.ts',
           'test/promote-async-daemon-lifecycle.test.ts',
           'test/daemon-ka-transport.test.ts',
+          // Pure HTTP classification coverage for chain transport failures,
+          // including preserving a known transaction hash on endpoint exhaustion.
+          'test/chain-rpc-transport-status.test.ts',
           'test/async-promote-worker.test.ts',
           'test/async-promote-queue-e2e.test.ts',
           'test/knowledge-assets-1116-share-errors.test.ts',