fix(indexer): correct native SAC network defaults

.env.example

@@ -45,8 +45,8 @@ POLL_INTERVAL_MS=6000
 # ─── SAC Contract IDs ────────────────────────────────────────
 # Comma-separated list of Soroban SAC (Stellar Asset Contract) IDs to watch.
 # When unset, defaults to the native XLM SAC for the configured STELLAR_NETWORK:
-#   testnet  → CDMLFMKMMD7MWZP3FKUBZPVHTUEDLSX4BYGYKH4GCESXYHS3IHQ4EIG4
-#   mainnet  → CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC
+#   testnet  → CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC
+#   mainnet  → CAS3J7GYLGXMF6TDJBBYYSE3HQ6BBSMLNUQ34T6TZMYMW2EVH34XOWMA
 #
 # How to derive a SAC address for any Stellar asset:
 #   import { Asset, Networks } from '@stellar/stellar-sdk';
@@ -57,15 +57,15 @@ POLL_INTERVAL_MS=6000
 #     .contractId(Networks.PUBLIC);
 #
 # Known mainnet SAC addresses:
-#   XLM (native): CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC
-#   USDC (Centre): CBIELTK6YBZJU5UP2WWQEUCYKLPU6AUNZ2BQ4WWFEIE3USCIHMXQDAMA
+#   XLM (native): CAS3J7GYLGXMF6TDJBBYYSE3HQ6BBSMLNUQ34T6TZMYMW2EVH34XOWMA
+#   USDC (Centre): CCW67TSZV3SSS2HXMBQ5JFGCKJNXKZM7UQUWUZPUTHXSTZLEO7SJMI75
 #
 # Example (watch XLM + USDC on mainnet):
-#   SAC_CONTRACT_IDS=CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC,CBIELTK6YBZJU5UP2WWQEUCYKLPU6AUNZ2BQ4WWFEIE3USCIHMXQDAMA
+#   SAC_CONTRACT_IDS=CAS3J7GYLGXMF6TDJBBYYSE3HQ6BBSMLNUQ34T6TZMYMW2EVH34XOWMA,CCW67TSZV3SSS2HXMBQ5JFGCKJNXKZM7UQUWUZPUTHXSTZLEO7SJMI75
 #
 # Per-network watch lists (for dual-network deployments when NETWORKS=testnet,mainnet):
-#   SAC_CONTRACT_IDS_TESTNET=CDMLFMKMMD7MWZP3FKUBZPVHTUEDLSX4BYGYKH4GCESXYHS3IHQ4EIG4
-#   SAC_CONTRACT_IDS_MAINNET=CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC
+#   SAC_CONTRACT_IDS_TESTNET=CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC
+#   SAC_CONTRACT_IDS_MAINNET=CAS3J7GYLGXMF6TDJBBYYSE3HQ6BBSMLNUQ34T6TZMYMW2EVH34XOWMA
 #
 # Soroban RPC's getEvents accepts multiple contract IDs in a single request —
 # there is no N+1 query penalty for watching multiple contracts.

docs/DUAL_NETWORK.md

@@ -27,7 +27,7 @@ behave exactly as before; #161 and #163 pass it explicitly.
 | `NETWORKS` | `testnet` | `testnet,mainnet` to index both in one process |
 | `STELLAR_NETWORK` | `testnet` | `mainnet` |
 | `SOROBAN_RPC_URL` | `https://soroban-testnet.stellar.org` | external provider endpoint (**secret — host env only**) |
-| `SAC_CONTRACT_IDS` | testnet SAC `CDMLFMKM…` | mainnet XLM SAC `CDLZFC3SY…` |
+| `SAC_CONTRACT_IDS` | testnet SAC `CDLZFC3SY…` | mainnet XLM SAC `CAS3J7GY…` |
 | `DATABASE_URL` | testnet DB | **separate** mainnet DB |
 | `HORIZON_URL` | optional testnet | optional `https://horizon.stellar.org` |
 

src/__tests__/sacContractIds.test.ts

@@ -9,6 +9,7 @@
  *  - SAC_CONTRACT_IDS takes precedence over CONTRACT_IDS when both set
  */
 
+import { Asset, Networks } from '@stellar/stellar-sdk';
 import {
   resolveSacContractIds,
   DEFAULT_XLM_SAC_MAINNET,
@@ -22,6 +23,8 @@ beforeEach(() => {
   // Shallow-clone so mutations don't bleed between tests
   process.env = { ...ORIGINAL_ENV };
   delete process.env.SAC_CONTRACT_IDS;
+  delete process.env.SAC_CONTRACT_IDS_MAINNET;
+  delete process.env.SAC_CONTRACT_IDS_TESTNET;
   delete process.env.CONTRACT_IDS;
   delete process.env.STELLAR_NETWORK;
 });
@@ -69,6 +72,15 @@ describe('resolveSacContractIds — legacy CONTRACT_IDS fallback', () => {
 
 // ── Default XLM SAC fallback ─────────────────────────────────────────────────
 describe('resolveSacContractIds — default XLM SAC when no env var is set', () => {
+  it.each([
+    ['mainnet', Networks.PUBLIC, DEFAULT_XLM_SAC_MAINNET],
+    ['testnet', Networks.TESTNET, DEFAULT_XLM_SAC_TESTNET],
+  ] as const)('uses the SDK-derived native SAC for %s', (network, passphrase, defaultId) => {
+    const derivedId = Asset.native().contractId(passphrase);
+    expect(defaultId).toBe(derivedId);
+    expect(resolveSacContractIds(network)).toEqual([derivedId]);
+  });
+
   it('defaults to the testnet XLM SAC when STELLAR_NETWORK is unset', () => {
     const result = resolveSacContractIds();
     expect(result).toEqual([DEFAULT_XLM_SAC_TESTNET]);

src/__tests__/sacDetect.test.ts

@@ -6,7 +6,7 @@
  * fake instance fetcher is injected throughout.
  */
 
-import { xdr } from "@stellar/stellar-sdk";
+import { Asset, Networks, xdr } from "@stellar/stellar-sdk";
 import {
   executableIsSac,
   instanceValIsSac,
@@ -17,9 +17,6 @@ import {
   type InstanceFetcher,
 } from "../indexer/sac-detect";
 
-// The native XLM SACs are hard-coded as known SACs in the module.
-const TESTNET_XLM_SAC = "CDMLFMKMMD7MWZP3FKUBZPVHTUEDLSX4BYGYKH4GCESXYHS3IHQ4EIG4";
-
 function sacInstanceVal(): xdr.ScVal {
   return xdr.ScVal.scvContractInstance(
     new xdr.ScContractInstance({
@@ -67,12 +64,24 @@ describe("instanceValIsSac", () => {
 });
 
 describe("detectSac", () => {
-  it("returns true for a known native XLM SAC without fetching", async () => {
+  it.each([
+    ["mainnet", Networks.PUBLIC],
+    ["testnet", Networks.TESTNET],
+  ] as const)("recognizes the SDK-derived %s native XLM SAC without fetching", async (network, passphrase) => {
     const fetcher = jest.fn<Promise<xdr.ScVal | null>, [string]>();
-    await expect(detectSac(TESTNET_XLM_SAC, fetcher)).resolves.toBe(true);
+    const contractId = Asset.native().contractId(passphrase);
+    await expect(detectSac(contractId, fetcher, network)).resolves.toBe(true);
     expect(fetcher).not.toHaveBeenCalled();
   });
 
+  it("does not treat the standalone native SAC as a known mainnet or testnet contract", async () => {
+    const contractId = Asset.native().contractId(Networks.STANDALONE);
+    const fetcher = jest.fn(async () => null);
+    await expect(detectSac(contractId, fetcher, "mainnet")).resolves.toBe(false);
+    await expect(detectSac(contractId, fetcher, "testnet")).resolves.toBe(false);
+    expect(fetcher).toHaveBeenCalledTimes(2);
+  });
+
   it("classifies a SAC via the injected fetcher", async () => {
     const fetcher: InstanceFetcher = async () => sacInstanceVal();
     await expect(detectSac("CSACTOKEN", fetcher)).resolves.toBe(true);

src/indexer.ts

@@ -34,9 +34,9 @@ export function resolveNftContractIds(network?: Network): string[] {
 // These are derived from Asset.native().contractId(Networks.PUBLIC / Networks.TESTNET)
 // and serve as the backwards-compatible default when SAC_CONTRACT_IDS is unset.
 export const DEFAULT_XLM_SAC_MAINNET =
-  "CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC";
+  "CAS3J7GYLGXMF6TDJBBYYSE3HQ6BBSMLNUQ34T6TZMYMW2EVH34XOWMA";
 export const DEFAULT_XLM_SAC_TESTNET =
-  "CDMLFMKMMD7MWZP3FKUBZPVHTUEDLSX4BYGYKH4GCESXYHS3IHQ4EIG4";
+  "CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC";
 
 /**
  * Resolve the list of SAC contract IDs to watch.

src/indexer/sac-detect.ts

@@ -26,8 +26,8 @@ import { resolveNetwork, type Network } from "../network";
 // The native XLM SAC on mainnet and testnet. These are fixed by the network and
 // never change, so we short-circuit detection (and any RPC call) for them.
 const KNOWN_SAC_IDS = new Set<string>([
-  "CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC", // mainnet native XLM
-  "CDMLFMKMMD7MWZP3FKUBZPVHTUEDLSX4BYGYKH4GCESXYHS3IHQ4EIG4", // testnet native XLM
+  "CAS3J7GYLGXMF6TDJBBYYSE3HQ6BBSMLNUQ34T6TZMYMW2EVH34XOWMA", // mainnet native XLM
+  "CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC", // testnet native XLM
 ]);
 
 // ─── Pure helpers ─────────────────────────────────────────────────────────────