ship: Polkadot page + Parity product to prod - #1187
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* add bench 086 polkadot-rpc: first Substrate chain in the RPC cluster
Extends rpc-capabilities to Polkadot, the first non-EVM, non-Solana
chain in the cluster. Substrate JSON-RPC via chain_getHeader (returns
hex-encoded block number matching EVM's eth_getBlockByNumber shape),
staleness by relay-block gap (40 blocks, ~4 min at Polkadot's ~6 s
cadence).
Harness changes:
- Chain.Kind gains "polkadot" alongside "solana" and default (EVM).
- New callSubstrateHeader: chain_getHeader POST, parses hex block
number, returns parentHash as the observed hash. Same latency
measurement + result classification as the EVM path.
- probeOne switches on Kind (was if solana / else). polkadot uses
polkadotStaleBlockGap = 40. Consensus observation is skipped
because chain_getHeader returns parentHash (N-1), not the current
block hash (deriving current hash needs Blake2 over the SCALE-
encoded header, out of scope).
- Archive loop is skipped for polkadot the same way as solana:
Polkadot state accesses via state_getStorage keyed by Blake2 storage
keys, no chain-agnostic depth analog for eth_getBalance-by-depth.
Providers at launch (3, live-verified on 2026-07-15 with four
consecutive chain_getHeader probes each):
- polkadot-official (Parity, rpc.polkadot.io)
- onfinality (public gateway, Web3 Foundation grantee)
- publicnode (Allnodes, extends its multi-chain footprint to
Substrate keyless)
Audited and excluded from the launch cohort:
- 1RPC: filters chain_getHeader as "Not Allowed" on the privacy
relay. Revisit if they expose a Substrate-friendly method set.
- Dwellir: 503 Service Unavailable during the audit sweep, revisit
once the gateway stabilises.
- Ankr: paid Polkadot tier only.
- Chainstack: key-gated on Substrate.
- RadiumBlock: rejects without referral header.
- Grove / Thirdweb: invalid-chain response.
Spec (benchmarks/polkadot-rpc.yml, bench № 086):
- Same schema as moonbeam-rpc / avalanche-rpc etc. so the parent
rpc-capabilities benchmark, chain cluster page and hub card
render it identically.
- Methodology documents the Substrate specifics: probe method
choice, staleness scaling, why no archive-depth or hash-quorum
columns.
- SEO/finding tokens use the standard {{best_name}} / {{best_p50}}
/ {{p50:slug}} template surface, consistent with other -rpc
benches.
- Provider tag copy explains OnFinality and Dwellir's Web3
Foundation grantee status so the leaderboard reads correctly
for someone who knows the Polkadot infra landscape.
Local checks:
- go build ./... clean.
- go test ./... clean.
- bun test src/ - 95/95 pass across 10 files, including the
citation reliability floor and consistency tests added in #1175.
* polkadot page + parity/onfinality/dwellir products
Wires the /chains/polkadot hub page, provider profiles, and logo
assets that surface once bench 086 polkadot-rpc starts feeding Prom.
- chains.ts: add Polkadot to CHAINS registry (L1, nativeSymbol DOT).
Auto-populates /chains/polkadot once benches referencing chain="polkadot"
land. Adaptive KPI strip fills in DefiLlama TVL, DEX volume and stables
when the chain-kpis harness starts sourcing Polkadot alongside the
other L1s.
- provider-registry.ts: three new entries for the Polkadot cohort.
* parity: brand entry for Parity Technologies (Polkadot / Substrate
implementation shop, operator of rpc.polkadot.io).
* polkadot-official: endpoint-level entry describing the reference
rpc.polkadot.io keyless endpoint; providers.ts aliases the slug
to parity so the /products page collapses under the operator's
brand.
* dwellir: brand entry for Dwellir (Web3 Foundation grantee, keyless
Substrate infra) — excluded from the 086 launch cohort due to a
503 during the audit sweep but kept in the registry for the
revisit and for other places their brand might appear.
- providers.ts: add polkadot-official → parity alias and canonical
brand casings for polkadot / parity / onfinality / dwellir so the
/products hub, badges, and OG images render the correct name
without the title-case fallback butchering them.
- logo-manifest.ts: polkadot.png (chain hero), parity.png (product page
logo), plus polkadot-official → parity slug alias so the endpoint
chip on the bench page picks up Parity's mark automatically.
95/95 pass on bun test src/. Local build clean.
---------
Co-authored-by: Florent Tapponnier <contact@mobula.io>
…#1186) Co-authored-by: Florent Tapponnier <contact@mobula.io>
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Cherry-picked from dev:
Verified on staging: /chains/polkadot, /benchmarks/polkadot-rpc, /products/parity all 200.