ci: add BNB Smart Chain (56) to the fork RPC network table

.github/workflows/rainix-manual-sol-artifacts.yaml

@@ -70,6 +70,8 @@ on:
         required: false
       RPC_URL_ROBINHOOD_FORK:
         required: false
+      RPC_URL_BSC_FORK:
+        required: false
       RPC_URL_SEPOLIA_FORK:
         required: false
       CI_DEPLOY_ARBITRUM_ETHERSCAN_API_KEY:
@@ -86,6 +88,8 @@ on:
         required: false
       CI_DEPLOY_ROBINHOOD_ETHERSCAN_API_KEY:
         required: false
+      CI_DEPLOY_BSC_ETHERSCAN_API_KEY:
+        required: false
       CI_DEPLOY_FLARE_ETHERSCAN_API_KEY:
         required: false
 env:
@@ -141,6 +145,8 @@ jobs:
           RAINIX_RPC_VARS_POLYGON: ${{ vars.RPC_URL_POLYGON_FORK }}
           RAINIX_RPC_SECRET_ROBINHOOD: ${{ secrets.RPC_URL_ROBINHOOD_FORK }}
           RAINIX_RPC_VARS_ROBINHOOD: ${{ vars.RPC_URL_ROBINHOOD_FORK }}
+          RAINIX_RPC_SECRET_BSC: ${{ secrets.RPC_URL_BSC_FORK }}
+          RAINIX_RPC_VARS_BSC: ${{ vars.RPC_URL_BSC_FORK }}
           RAINIX_RPC_SECRET_SEPOLIA: ${{ secrets.RPC_URL_SEPOLIA_FORK }}
           RAINIX_RPC_VARS_SEPOLIA: ${{ vars.RPC_URL_SEPOLIA_FORK }}
       # 41 submission attempts over 10 minutes, against foundry's default 6 over
@@ -168,4 +174,5 @@ jobs:
           # Etherscan API but ignores the key; exported so a consumer's `[etherscan]`
           # entry for it never resolves to an unset variable.
           CI_DEPLOY_ROBINHOOD_ETHERSCAN_API_KEY: ${{ secrets.EXPLORER_VERIFICATION_KEY || secrets.CI_DEPLOY_ROBINHOOD_ETHERSCAN_API_KEY || vars.CI_DEPLOY_ROBINHOOD_ETHERSCAN_API_KEY || '' }}
+          CI_DEPLOY_BSC_ETHERSCAN_API_KEY: ${{ secrets.EXPLORER_VERIFICATION_KEY || secrets.CI_DEPLOY_BSC_ETHERSCAN_API_KEY || vars.CI_DEPLOY_BSC_ETHERSCAN_API_KEY || '' }}
           CI_DEPLOY_FLARE_ETHERSCAN_API_KEY: ${{ secrets.CI_DEPLOY_FLARE_ETHERSCAN_API_KEY || vars.CI_DEPLOY_FLARE_ETHERSCAN_API_KEY || '' }}

.github/workflows/rainix-manual-sol-verify.yaml

@@ -64,6 +64,8 @@ on:
         required: false
       CI_DEPLOY_ROBINHOOD_ETHERSCAN_API_KEY:
         required: false
+      CI_DEPLOY_BSC_ETHERSCAN_API_KEY:
+        required: false
       CI_DEPLOY_FLARE_ETHERSCAN_API_KEY:
         required: false
 env:
@@ -163,4 +165,5 @@ jobs:
           # Etherscan API but ignores the key; exported so a consumer's `[etherscan]`
           # entry for it never resolves to an unset variable.
           CI_DEPLOY_ROBINHOOD_ETHERSCAN_API_KEY: ${{ secrets.EXPLORER_VERIFICATION_KEY || secrets.CI_DEPLOY_ROBINHOOD_ETHERSCAN_API_KEY || vars.CI_DEPLOY_ROBINHOOD_ETHERSCAN_API_KEY || '' }}
+          CI_DEPLOY_BSC_ETHERSCAN_API_KEY: ${{ secrets.EXPLORER_VERIFICATION_KEY || secrets.CI_DEPLOY_BSC_ETHERSCAN_API_KEY || vars.CI_DEPLOY_BSC_ETHERSCAN_API_KEY || '' }}
           CI_DEPLOY_FLARE_ETHERSCAN_API_KEY: ${{ secrets.CI_DEPLOY_FLARE_ETHERSCAN_API_KEY || vars.CI_DEPLOY_FLARE_ETHERSCAN_API_KEY || '' }}

.github/workflows/rainix-sol-test.yaml

@@ -24,6 +24,8 @@ on:
         required: false
       RPC_URL_ROBINHOOD_FORK:
         required: false
+      RPC_URL_BSC_FORK:
+        required: false
       RPC_URL_SEPOLIA_FORK:
         required: false
 env:
@@ -87,6 +89,8 @@ jobs:
           RAINIX_RPC_VARS_POLYGON: ${{ vars.RPC_URL_POLYGON_FORK }}
           RAINIX_RPC_SECRET_ROBINHOOD: ${{ secrets.RPC_URL_ROBINHOOD_FORK }}
           RAINIX_RPC_VARS_ROBINHOOD: ${{ vars.RPC_URL_ROBINHOOD_FORK }}
+          RAINIX_RPC_SECRET_BSC: ${{ secrets.RPC_URL_BSC_FORK }}
+          RAINIX_RPC_VARS_BSC: ${{ vars.RPC_URL_BSC_FORK }}
           RAINIX_RPC_SECRET_SEPOLIA: ${{ secrets.RPC_URL_SEPOLIA_FORK }}
           RAINIX_RPC_VARS_SEPOLIA: ${{ vars.RPC_URL_SEPOLIA_FORK }}
       - run: nix develop github:rainlanguage/rainix/${{ env.RAINIX_SHA }}#sol-shell -c forge test -vvv

.github/workflows/rainix-sol.yaml

@@ -24,6 +24,8 @@ on:
         required: false
       RPC_URL_ROBINHOOD_FORK:
         required: false
+      RPC_URL_BSC_FORK:
+        required: false
       RPC_URL_SEPOLIA_FORK:
         required: false
 jobs:
@@ -45,4 +47,5 @@ jobs:
       RPC_URL_HYPEREVM_FORK: ${{ secrets.RPC_URL_HYPEREVM_FORK }}
       RPC_URL_POLYGON_FORK: ${{ secrets.RPC_URL_POLYGON_FORK }}
       RPC_URL_ROBINHOOD_FORK: ${{ secrets.RPC_URL_ROBINHOOD_FORK }}
+      RPC_URL_BSC_FORK: ${{ secrets.RPC_URL_BSC_FORK }}
       RPC_URL_SEPOLIA_FORK: ${{ secrets.RPC_URL_SEPOLIA_FORK }}

.github/workflows/rainix-tag-release.yaml

@@ -123,6 +123,8 @@ on:
         required: false
       RPC_URL_ROBINHOOD_FORK:
         required: false
+      RPC_URL_BSC_FORK:
+        required: false
       RPC_URL_SEPOLIA_FORK:
         required: false
 env:
@@ -227,6 +229,8 @@ jobs:
           RAINIX_RPC_VARS_POLYGON: ${{ vars.RPC_URL_POLYGON_FORK }}
           RAINIX_RPC_SECRET_ROBINHOOD: ${{ secrets.RPC_URL_ROBINHOOD_FORK }}
           RAINIX_RPC_VARS_ROBINHOOD: ${{ vars.RPC_URL_ROBINHOOD_FORK }}
+          RAINIX_RPC_SECRET_BSC: ${{ secrets.RPC_URL_BSC_FORK }}
+          RAINIX_RPC_VARS_BSC: ${{ vars.RPC_URL_BSC_FORK }}
           RAINIX_RPC_SECRET_SEPOLIA: ${{ secrets.RPC_URL_SEPOLIA_FORK }}
           RAINIX_RPC_VARS_SEPOLIA: ${{ vars.RPC_URL_SEPOLIA_FORK }}
       - name: Verify live chain matches the fresh pins

README.md

@@ -118,10 +118,11 @@ jobs:
 
 `secrets: inherit` is required because the reusable wires the standard fork RPC
 env vars (`ARBITRUM_RPC_URL`, `BASE_RPC_URL`, `BASE_SEPOLIA_RPC_URL`,
-`ETHEREUM_RPC_URL`, `FLARE_RPC_URL`, `HYPEREVM_RPC_URL`, `POLYGON_RPC_URL`,
-`ROBINHOOD_RPC_URL`, `SEPOLIA_RPC_URL`, `CI_DEPLOY_SEPOLIA_RPC_URL`) plus
-`ETHERSCAN_API_KEY` and `DEPLOYMENT_KEY` from the consumer org's secrets/vars.
-Repos that do no fork tests can ignore — empty values are harmless.
+`BSC_RPC_URL`, `ETHEREUM_RPC_URL`, `FLARE_RPC_URL`, `HYPEREVM_RPC_URL`,
+`POLYGON_RPC_URL`, `ROBINHOOD_RPC_URL`, `SEPOLIA_RPC_URL`,
+`CI_DEPLOY_SEPOLIA_RPC_URL`) plus `ETHERSCAN_API_KEY` and `DEPLOYMENT_KEY` from
+the consumer org's secrets/vars. Repos that do no fork tests can ignore — empty
+values are harmless.
 
 `CI_DEPLOY_SEPOLIA_RPC_URL` and the `ETH_RPC_URL` it is bound to are LEGACY and
 scheduled for removal (rainlanguage/rainix#340). `ETH_RPC_URL` reads as though
@@ -278,9 +279,9 @@ any repo in the org pins for that network, three times consecutively. An
 suite with `trying to fork from an older block with a non-archive node`; a
 code-only check would select a host that answers no `eth_call` at all; and a
 single sample would qualify a load balancer that round-robins over a mix of
-archive and pruning backends. Ethereum, HyperEVM and Robinhood Chain are
-latest-only in every consumer, so they are not held to the archive bar, and
-neither are deploy/broadcast paths.
+archive and pruning backends. Ethereum, HyperEVM, Robinhood Chain and BNB Smart
+Chain are latest-only in every consumer, so they are not held to the archive
+bar, and neither are deploy/broadcast paths.
 
 **Health also covers load, not just correctness.** Chain id, historical state
 and historical `eth_call` are all correctness questions, and an endpoint that is

rainix-static/src/rpc_preflight.rs

@@ -373,6 +373,26 @@ pub(crate) const NETWORKS: &[Network] = &[
             "https://robinhood-rpc.publicnode.com",
         ],
     },
+    Network {
+        key: "bsc",
+        env_name: "BSC_RPC_URL",
+        secret_name: "RPC_URL_BSC_FORK",
+        chain_id: 56,
+        // Latest-only in every consumer today (st0x.deploy forks it at head
+        // for its prod-state and cross-chain parity pins).
+        archive_blocks: &[],
+        probe_contract: "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c", // WBNB
+        // Measured 2026-09-10, same method as the rest of the table: 5/5 on
+        // the sequential probe, then a 16-way burst, from one non-CI host.
+        // publicnode and the Binance dataseed each went 5/5 and 16/16.
+        // Rejected the same day: bsc.drpc.org 4/5 then 6/16; 56.rpc.thirdweb.com
+        // 5/5 then 0/16 (burst-throttled); binance.llamarpc.com and
+        // bsc.gateway.tenderly.co refused the light probe outright.
+        defaults: &[
+            "https://bsc-rpc.publicnode.com",
+            "https://bsc-dataseed.binance.org",
+        ],
+    },
 ];
 
 /// Split a secret/variable value into candidate URLs.