[Gunit2481]

Description

Link maintenance from a docs audit. Every dead link and endpoint was re-tested before being changed (HTTP checks with redirects followed, and real JSON-RPC calls for endpoints), and every replacement URL returns 200.

RPC endpoints

• Removed BlastAPI endpoints (Astar, Shiden, Shibuya). The service is shut down and now returns "Blast API is no longer available".
• Removed RadiumBlock endpoints for Astar and Shiden (no response to JSON-RPC calls).
• Removed the OnFinality Shiden public endpoints (gateway returns 504). OnFinality Astar still answers and is kept.
• Affected: endpoints.md, the RPC tables in the EVM Ledger, MetaMask and ArthSwap guides, truffle.md (now evm.shibuya.astar.network), using-sidecar.md and the Polkadot.js link in spinup_collator.md (now rpc.astar.network).

Internal links to moved pages

• use_remix.md: endpoints and faucet pages; the Remix Desktop link had literal **desktop** in its URL.
• dapp-staking-faq.md: requirements and registration pages.
• interact_with_xc20.md: multisig guide now points to the PolkaSafe page.
• interoperability/faq.md: removed a link to a page that no longer exists.
• metamask-snaps/index.md: removed a link to a removed user guide.

Redirected or dead external links

• Blockscout: blockscout.com/<network> updated to the <network>.blockscout.com subdomains (use_remix, use_hardhat, add-wallets-to-portal, dia).
• Substrate docs (docs.substrate.io, substrate.io) updated to docs.polkadot.com; Truffle moved to archive.trufflesuite.com.
• Polkadot wiki: wiki.polkadot.network updated to the matching wiki.polkadot.com pages.
• Subsquare: app.subsquare.io (DNS no longer resolves) changed to astar.subsquare.io; Community Treasury proposals path corrected.
• Hardhat, React, Alchemy, Stargate and Talisman links updated to their current URLs.

Third-party documentation links

• DefiLlama: adapter guide moved to docs.llama.fi/list-your-project/other-dashboards.
• Safe: "Contract Interactions" (old Gnosis help centre) replaced by the Safe Transaction Builder article.
• Ledger generic-app migration: the retired Polkadot support articles are replaced by Talisman's and SubWallet's own Ledger guides, and the Polkadot wiki migration page for Nova Wallet.
• SubWallet hardware-wallet guides moved under cold-wallet-management/.
• Existential deposit: Polkadot wiki page replaces the retired support article.
• Tokenomics fee model: research.web3.foundation moved to research.parity.io (same page and anchor).
• Removed: the dead Replit demo link (web3-onboard) and a dead SubWallet video link.

Not changed here: links on the Privy, Lighthouse and Band VRF pages, pending a decision on whether those integrations are still valid on Astar.

Type of Change

• Bug fix (typo, broken link, outdated information)
• New integration or tooling documentation
• New tutorial or guide
• Structural or navigation improvement
• Other

Linked Issue

N/A (bug fixes only)

Checklist

• I have read the CONTRIBUTING.md guidelines
• The build passes locally (yarn build; the same 4 pre-existing HTML-minifier notes as on main)
• All links in changed files are working
• Images use the <Figure> component with absolute paths (no images changed)
• Content is factual and contains no marketing language
• The file structure follows the existing documentation hierarchy

[github-actions]

Visit the preview URL for this PR (updated for commit 05308dc):

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