feat: use dRPC's chain label as a last-resort name

package.json

@@ -7,7 +7,7 @@
     "generate": "tsx scripts/generate.ts",
     "sync": "tsx scripts/sync.ts",
     "typecheck": "tsc --noEmit",
-    "test": "tsx --test scripts/sync.test.ts",
+    "test": "tsx --test scripts/sync.test.ts scripts/providers/drpc.test.ts",
     "test:integration": "tsx --test --test-reporter=spec --test-reporter-destination=stdout --test-reporter=junit --test-reporter-destination=junit.xml tests/chain-tests.test.ts tests/etherscan-instances.test.ts",
     "test:integration:chain": "tsx --test --test-reporter=spec --test-reporter-destination=stdout --test-reporter=junit --test-reporter-destination=junit-chain.xml tests/chain-tests.test.ts",
     "test:integration:etherscan": "tsx --test --test-reporter=spec --test-reporter-destination=stdout --test-reporter=junit --test-reporter-destination=junit-etherscan.xml tests/etherscan-instances.test.ts"

scripts/generate.ts

@@ -535,6 +535,7 @@ async function main() {
       etherscan?.chainName ??
       blockscoutName ??
       meta?.name ??
+      drpc?.name ??
       `Chain ${chainId}`;
 
     const rpcSlots: RpcSlot[] = [];

scripts/providers/drpc.test.ts

@@ -0,0 +1,30 @@
+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import { buildDrpcChainName } from "./drpc.js";
+
+describe("buildDrpcChainName", () => {
+  it("joins the protocol label and the network id", () => {
+    // The case that motivated this: chain 61900 is known only to dRPC.
+    assert.equal(buildDrpcChainName("Mova", "Mainnet"), "Mova Mainnet");
+    assert.equal(buildDrpcChainName("Polygon", "Amoy"), "Polygon Amoy");
+  });
+
+  it("does not repeat the label when the network id already starts with it", () => {
+    assert.equal(buildDrpcChainName("megaETH", "MegaETH Testnet"), "MegaETH Testnet");
+    assert.equal(buildDrpcChainName("Moonriver", "Moonriver"), "Moonriver");
+    assert.equal(buildDrpcChainName("Ozean", "Ozean Poseidon Testnet"), "Ozean Poseidon Testnet");
+  });
+
+  it("capitalises an all-lowercase network id", () => {
+    assert.equal(buildDrpcChainName("Ethereum Classic", "mainnet"), "Ethereum Classic Mainnet");
+  });
+
+  it("leaves mixed-case network ids alone", () => {
+    assert.equal(buildDrpcChainName("Berachain", "bArtio"), "Berachain bArtio");
+  });
+
+  it("returns undefined without a label, and the label alone without a network id", () => {
+    assert.equal(buildDrpcChainName(undefined, "Mainnet"), undefined);
+    assert.equal(buildDrpcChainName("Mova", undefined), "Mova");
+  });
+});

scripts/providers/drpc.ts

@@ -2,16 +2,20 @@ import YAML from "yaml";
 
 export interface DrpcChainData {
   shortName: string;
+  /** Human-readable name, e.g. "Mova Mainnet". Absent when the YAML has no label. */
+  name?: string;
 }
 
 // chains.yaml shape (only the fields we consume).
 interface DrpcYamlChain {
+  id?: string;
   "chain-id"?: string | number;
   "short-names"?: string[];
 }
 
 interface DrpcYamlProtocol {
   type?: string;
+  label?: string;
   chains?: DrpcYamlChain[];
 }
 
@@ -40,6 +44,25 @@ function parseChainId(raw: string | number | undefined): number | null {
   return Number.isNaN(id) || id <= 0 ? null : id;
 }
 
+/**
+ * Build a display name from a protocol label and a network id, e.g.
+ * `label: Mova` + `id: Mainnet` -> "Mova Mainnet".
+ *
+ * Two touch-ups keep the result readable:
+ *  - When the network id already starts with the label (`megaETH` +
+ *    `MegaETH Testnet`, `Moonriver` + `Moonriver`), the label is dropped
+ *    instead of repeated.
+ *  - An all-lowercase network id (only `mainnet` today) is capitalised.
+ */
+export function buildDrpcChainName(label: string | undefined, networkId: string | undefined): string | undefined {
+  if (!label) return undefined;
+  if (!networkId) return label;
+
+  const network = /^[a-z]+$/.test(networkId) ? networkId[0].toUpperCase() + networkId.slice(1) : networkId;
+  if (network.toLowerCase().startsWith(label.toLowerCase())) return network;
+  return `${label} ${network}`;
+}
+
 /**
  * Fetches the list of EVM chains supported by dRPC from their public
  * chains.yaml config.
@@ -78,7 +101,7 @@ export async function fetchDrpcChains(): Promise<Map<number, DrpcChainData>> {
 
       // First occurrence wins — don't let a later mislabelled entry overwrite.
       if (!result.has(chainId)) {
-        result.set(chainId, { shortName });
+        result.set(chainId, { shortName, name: buildDrpcChainName(protocol.label, chain.id) });
       }
     }
   }