RPC failover

Client accepts a single endpoint or an ordered endpoint list.

const client = new Client(rpcList, {
    timeout: 10_000,
    failoverThreshold: 3,
    consoleOnFailover: true,
    userAgent: 'Morphit/1.7.5'
});

Behavior covered by contract tests

The first healthy endpoint remains sticky across repeated successful calls.
Timeout failures can move the client to the next endpoint.
client.currentAddress is updated when the active endpoint changes.
timeout: 0 remains a no-immediate-timeout success path on healthy local endpoints.
FC-style JSON-RPC application errors are mapped to the public RPCError shape.
JSON-RPC responses with mismatched ids are rejected.

Options

Option	Default	Meaning
`timeout`	`60000`	Milliseconds before an RPC request is aborted. Current behavior around explicit `0` should be treated as compatibility-sensitive and validated in your target path.
`failoverThreshold`	`3`	Number of retry/failover rounds. Infinite-retry semantics are compatibility-sensitive; avoid unbounded retries in request/response services unless deliberately tested.
`consoleOnFailover`	`false`	Log failover events to `console.log` on the default transport.
`userAgent`	`dblurt/<version>`	Application-specific HTTP User-Agent sent by Node.js RPC requests. Browsers forbid scripts from setting this header.
`backoff`	internal default	Function returning retry delay in milliseconds.
`chainId`	Blurt mainnet chain id	Override for non-mainnet usage.
`addressPrefix`	`BLT`	Override address prefix for non-mainnet usage.

Recommended endpoint list

const rpcList = [
    'https://rpc.blurt.blog',
    'https://blurt-rpc.saboin.com',
    'https://rpc.beblurt.com',
    'https://blurtrpc.dagobert.uk',
    'https://rpc.drakernoise.com'
];

Node health

For operational node monitoring, see the Blurt node checker:

https://gitlab.com/beblurt/blurt-nodes-checker

Security notes

RPC endpoints are not automatically trusted. Server-side applications should not accept arbitrary user-provided RPC URLs without allowlisting and network egress controls. Prefer trusted HTTPS endpoints for production. See Security guide.