Fastest free Union RPC, live no-key endpoint latency
HTTP round-trip latency for Tendermint /status queries against every available public Union (union-1) endpoint, audited every 60 seconds from 3 regions.
TL;DR. As of , Nodes.Guru posts the lowest rpc latency at 234 ms (p50, 24h) on Fastest free Union RPC, live no-key endpoint latency. Source: OpenChainBench, https://openchainbench.com/benchmarks/union-rpc.
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Comparing free RPC endpoints across every chain we measure? Open the cross-chain RPC matrix →
Union is a trust-minimised, zero-knowledge cross-chain protocol built on a custom Cosmos SDK chain (chain ID union-1). It enables secure interoperability between Cosmos, EVM, and other ecosystems via ZK proof-based consensus verification, with no external validators or multisigs required. The chain uses the standard Tendermint RPC interface; block height is fetched via the /status endpoint. Public keyless RPC nodes are provided by Nodes.Guru, Stake And Relax, and High Stakes. Every provider was live-verified with consecutive block-height probes at launch.
Methodology
Per-chain member of the RPC latency cluster, extended to Union (union-1). We measure the round-trip latency of a Tendermint /status query against every available public Union endpoint that sustains continuous probing: 3 providers at launch, every 60 seconds, from us-east, eu-west and Singapore. Each provider is probed via a GET /status request from which the block number is extracted. The harness classifies every response (ok / http_err / jsonrpc_err / stale / timeout) with a Cosmos-scaled staleness gap (20 blocks, around 80 s at 4 s/block). The cross-chain view lives on the parent rpc-capabilities benchmark; this page is the Union-scoped answer with per-region breakdowns as a first-class dimension.
Frequently asked
What is the fastest free Union RPC right now?
Nodes.Guru currently leads at 234 ms (Union block height p50 over the last 24h), measured against 3 providers probed every 60 seconds from us-east, eu-west and Singapore. The leaderboard re-sorts continuously against fresh Prometheus samples.
Which Union RPC endpoints work without an API key?
3 endpoints sustain continuous keyless probing at launch: Nodes.Guru (rpc-1.union.nodes.guru), Stake And Relax (union-rpc.stakeandrelax.net), and High Stakes (union-rpc.highstakes.ch). Every listed endpoint was live-verified before inclusion.
What is Union and why does its RPC latency matter?
Union is a ZK-based cross-chain interoperability protocol with a native Cosmos SDK chain (union-1). It connects blockchains without trusted intermediaries by verifying consensus proofs on-chain. Developers building cross-chain applications, bridges, or omnichain protocols on Union need reliable low-latency RPC access to query transactions, proofs, and chain state.
Does the fastest Union RPC change by region?
Often. Community validators like Nodes.Guru and High Stakes host in different datacentres. The region tabs re-scope every number to a single probe origin so you can pick the best endpoint for your user base.
What makes Union different from other cross-chain protocols?
Union replaces trusted validator sets and multisigs with ZK consensus proofs, making cross-chain message passing verifiable on-chain. This means no external trust assumptions: the security of the bridge reduces to the security of the underlying chains and ZK proof system.
Source code github.com/ChainBench/OpenChainBench/tree/main/harnesses/rpc-capabilities