{"slug":"harmony-rpc","title":"Fastest free Harmony ONE RPC, live no-key endpoint latency","subtitle":"HTTP round-trip latency for eth_getBlockByNumber against every free, no-key public Harmony ONE RPC endpoint, audited every 60 seconds from 3 regions.","category":"RPCs","metric":"RPC latency","unit":"ms","status":"live","higherIsBetter":false,"filters":null,"value":94.546,"leader":{"name":"Harmony S0","slug":"harmony-s0","value":94.546},"rankings":[{"name":"Harmony S0","slug":"harmony-s0","ms":{"p50":94.546,"p90":143.418,"p99":435.197,"mean":119.199},"successRate":100,"sampleSize":4321.84}],"sparkline":[93.89,89.8658,106.679,126.113,146.555,148.885,149.632,146.492,144.317,142.341,145.081,136.524,121.232,102.835,94.828,93.4096,93.877,92.7518,90.5175,87.6896,87.5512,92.4625,110.971,137.59,161.374,160.132,134.356,118.484,119.391,137.415,144.36,156.835,134.411,112.965,90.614,107.869,125.124,124.9,110.491,96.2873,92.6176,92.7872,92.9215,94.8819,96.2241,97.6507,97.2739,137.189,135.853,137.919,109.717,125.439,133.864,120.871,105.235,89.9351,108.775,123.774,138.634,124.906,110.045,95.6,108.17,125.698,141.643,131.253,111.178,92.6677,96.548,115.282,129.905,139.003,137.472],"sampleSize":4321.84,"asOf":"2026-09-19T07:11:30.977Z","headline":"Harmony S0 posts the lowest rpc latency at 95 ms (p50, 24h) on Fastest free Harmony ONE RPC, live no-key endpoint latency.","quote":"Harmony S0 posts the lowest rpc latency at 95 ms (p50, 24h) on Fastest free Harmony ONE RPC, live no-key endpoint latency. Source: OpenChainBench (https://openchainbench.com/benchmarks/harmony-rpc).","cite":{"plain":"OpenChainBench. \"Fastest free Harmony ONE RPC, live no-key endpoint latency\". Retrieved 2026-09-19. https://openchainbench.com/benchmarks/harmony-rpc","bibtex":"@misc{ocb_harmony_rpc,\n  author = {OpenChainBench},\n  title  = {Fastest free Harmony ONE RPC, live no-key endpoint latency},\n  year   = {2026},\n  url    = {https://openchainbench.com/benchmarks/harmony-rpc},\n  note   = {Retrieved 2026-09-19}\n}","apa":"OpenChainBench. (2026). Fastest free Harmony ONE RPC, live no-key endpoint latency. Retrieved September 19, 2026, from https://openchainbench.com/benchmarks/harmony-rpc","ris":"TY  - GEN\r\nAU  - OpenChainBench\r\nTI  - Fastest free Harmony ONE RPC, live no-key endpoint latency\r\nPY  - 2026\r\nUR  - https://openchainbench.com/benchmarks/harmony-rpc\r\nY2  - 2026-09-19\r\nER  - \r\n"},"pageUrl":"https://openchainbench.com/benchmarks/harmony-rpc","ogImage":"https://openchainbench.com/api/og/harmony-rpc","source":"https://github.com/ChainBench/OpenChainBench/tree/main/harnesses/rpc-capabilities","methodology":["Cadence: every 60 seconds per provider, from each of 3 probe regions (us-east Virginia, eu-west Amsterdam, sgp Singapore). Headline p50/p90/p99 aggregate across all 3 regions via Prometheus `avg(quantile_over_time(...))`; per-region breakdowns are first-class on this page via the region tabs.","Payload: `{\"jsonrpc\":\"2.0\",\"id\":<rotating>,\"method\":\"eth_getBlockByNumber\",\"params\":[\"latest\",false]}`. Plain HTTP POST, identical for every endpoint, no API key in any request.","Latency: client-side round-trip delta in milliseconds, exposed as both a gauge and a histogram (buckets 50 ms to 10 s), so percentiles are computed via Prometheus `quantile_over_time` over the last 24 hours.","Call-result classification: `ok` (HTTP 200 + non-empty result), `http_err`, `jsonrpc_err` (HTTP 200 carrying an error body), `stale` (more than 20 blocks behind the cross-provider tip), `timeout`.","This page is part of the per-chain RPC cluster derived from the cross-chain [rpc-capabilities](https://openchainbench.com/benchmarks/rpc-capabilities) benchmark; the identical harness, cadence and exclusion rules apply on every chain.","Chain scope: every query on this page is pinned to `chain=\"harmony\"`. Provider coverage at launch: 1 no-key endpoint (Harmony S0)."],"license":"CC-BY-4.0"}