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Defined in: constants.ts:94 Resolves the default EVM RPC URLs used for x402 payment signing, keyed by CAIP-2 network identifier. Only Base and Base Sepolia get a default: both are backed by the CDP project’s own authenticated node endpoint (via getBaseNodeRpcUrl), so no shared public infrastructure sits on the payment-signing path and no extra configuration is required to use them. All other networks (Polygon, Arbitrum, World, etc.) have no default RPC. RPC URLs are optional for core payload signing on those networks — they’re only needed to backfill optional extension capabilities (for example, eip2612 gas-sponsoring enrichment) — so callers that need one must supply it explicitly via the rpcUrls config option or CDP_X402_RPC_URLS environment variable.

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Returns

Promise<Record<string, { rpcUrl: string; }>> CAIP-2 keyed RPC configuration map containing only the networks that resolved successfully.