[docs-agent] Weekly skills update 2026-09-16

[alchemy-bot]

Weekly sync from merged docs changes (2026-09-09 → 2026-09-16).

Docs PRs covered

• #1623 — Add Solana getTokenAccountsByOwnerV2 method to JSON-RPC spec (DOCS-229, @alexfilip2). Helius-compatible paginated V2 successor to getTokenAccountsByOwner.
• #1621 + #1622 — Roll out Arc Mainnet across docs surfaces (DOCS-228, @bmoyroud). Arc Mainnet is now LIVE in chain-config (chainId 0x13b2, gas token USDC); previously docs only listed Arc Testnet.

Skills files updated

• skills/alchemy-api/references/solana-rpc.md — added ## getTokenAccountsByOwnerV2 section directly above ## Other Common Methods, mirroring the shape PR [docs-agent] Weekly skills update 2026-09-02 #47 uses for getProgramAccountsV2 (params table + oneOf result shapes + curl request). Added a getTokenAccountsByOwnerV2 row to the Common Methods table and relabelled the existing getTokenAccountsByOwner row as V1. Bumped updated: frontmatter to 2026-09-16.
• skills/alchemy-api/references/operational-supported-networks.md — inserted arc-mainnet alphabetically before the existing arc-testnet line. Bumped updated: frontmatter to 2026-09-16.
• plugins/alchemy/skills/alchemy-api/references/* — byte-identical mirrors regenerated via plugins/alchemy/scripts/sync_from_catalog.py and verified with filecmp.

Material changes

• New Solana JSON-RPC method surface — getTokenAccountsByOwnerV2 adds server-side pagination (limit, paginationKey), incremental-sync capability (changedSinceSlot), and an optional {context, value} envelope (withContext) to the V1 owner-scoped token-account query. Same 10 CU pricing, same base params, same jsonParsed entry shape. Both V1 and V2 live on the same standard endpoint (solana-mainnet.g.alchemy.com/v2/<key>) and Alchemy's routing is now live (x-bot-ignore-guarded in the OpenRPC spec until Daikon catches up).
• Arc Mainnet supported — Arc production mainnet is live at Alchemy across Node (evm, debug, trace), Wallets (Bundler, Gas Sponsorship, ERC-20 Gas Payments, BSOs), NFT API, and the sibling debug/trace/token/transfers product specs. Skills only enumerate the spec-derived network list, so the update here is limited to adding arc-mainnet to that list.

Non-material this week (skipped, confirmed)

• #1624 + #1625 — Daikon OpenRPC + server-endpoints sync (Bot). Always skip per playbook.
• #1572 — Weekly Blockchain Node Upgrades Changelog for 2026-08-27. Always skip per playbook.
• #1615 — PAYG flat-rate pricing ($0.525/M CU across all usage; removes the 300M CU volume break). Rotable numeric quantity per LEARNINGS; skills do not enumerate per-plan pricing tiers.

Overlap with open weekly PRs

• PR [docs-agent] Weekly skills update 2026-09-02 #47 (still open) adds ## getProgramAccountsV2 to solana-rpc.md in the same slot above ## Other Common Methods. This PR's ## getTokenAccountsByOwnerV2 section sits at the same insertion point and the Common Methods table row is added in the same block. If [docs-agent] Weekly skills update 2026-09-02 #47 lands first, this PR needs a trivial rebase to place the two V2 sections adjacent. If this PR lands first, [docs-agent] Weekly skills update 2026-09-02 #47 needs the same rebase in reverse. Either order works; no content conflict — the two sections are independent.
• PR [docs-agent] Weekly skills update 2026-09-02 #47 also bumps operational-supported-networks.md frontmatter and edits the Degen entry. Adding arc-mainnet on a different line does not conflict with [docs-agent] Weekly skills update 2026-09-02 #47's Degen change; both are stand-alone insertions with distinct anchors.
• PR [docs-agent] Weekly skills update 2026-09-09 #48 touches wallets-wallet-apis.md only. No overlap with this PR.

Notes for reviewers

• Signed commit under alchemy-bot's GPG key.
• Cron-triggered weekly with no Slack originator — no Requested-by: trailer per LEARNINGS (workflow's missing-attribution path is the correct behavior).
• No new skill files created; no reference-file additions or deletions. Additive-only content edits on two existing files (+ mirrors).