[docs-agent] Weekly skills update 2026-09-23

[alchemy-bot]

Weekly sync from docs changes merged 2026-09-16 → 2026-09-23.

Docs PRs covered

• alchemyplatform/docs#1636 — new Portfolio POST /transfers/by-address (Beta), replaces the older POST /transactions/history/by-address beta.
• alchemyplatform/docs#1643 — 14 supported EVM networks + internal category caveat (Ethereum Mainnet, Base Mainnet, Polygon Mainnet, Arc Mainnet, Arc Testnet only) documented on /transfers/by-address.
• alchemyplatform/docs#1630 — Arc Mainnet + Testnet added to internal transfer support for both alchemy_getAssetTransfers and the Address Activity webhook.
• alchemyplatform/docs#1639 — new Solana getTokenHoldersAtSlot method (mint-side complement to getTokenAccountsByOwnerAtSlot / getBalanceByOwnerAtSlot).

Skills files updated

• skills/alchemy-api/references/data-portfolio-apis.md — swapped the deprecated POST /transactions/history/by-address (Beta) section for the new POST /transfers/by-address (Beta) section: single-address input, 14-network fan-out, required category, partial-failure semantics, response schema, official docs link. Updated Notes + CLI note + Official Docs pointer.
• skills/alchemy-api/references/data-transfers-api.md — expanded the internal category coverage line (was: Ethereum + Polygon Mainnet only; now: + Base Mainnet + Arc Mainnet + Arc Testnet). Broadened the top-of-file "Supported chains" note to acknowledge the expanded EVM list and link to the docs page.
• skills/alchemy-api/references/webhooks-address-activity.md — added an "Internal transfer support" subsection enumerating the chains that emit internal transfers via the Address Activity webhook (including the new Arc Mainnet + Testnet), with the delegatecall and miner-reward caveats.
• skills/alchemy-api/references/solana-rpc.md — added a getTokenHoldersAtSlot section under the historical *ByOwnerAtSlot block: mint + slot required, sortBy case-sensitivity, coverage window, response shape, error codes, current x-bot-ignore posture.

Plugins mirror (plugins/alchemy/skills/alchemy-api/references/*) synced byte-identical via plugins/alchemy/scripts/sync_from_catalog.py.

Material changes

• New API surface: Portfolio Transfers By Wallet (Beta) + Solana getTokenHoldersAtSlot.
• Capability axis expansion: Arc Mainnet + Testnet gain internal transfer support on both alchemy_getAssetTransfers and the Address Activity webhook; Base Mainnet joins the internal category on alchemy_getAssetTransfers.

Overlap with open weekly PRs

• PR [docs-agent] Weekly skills update 2026-09-02 #47 (2026-09-02) touches solana-rpc.md (adds getProgramAccountsV2) and wallets-wallet-apis.md (EIP-7702 default flip note, worded as forward-looking Sept 21). This week's solana-rpc.md addition (getTokenHoldersAtSlot) is a separate section under the historical *ByOwnerAtSlot block — no line-level conflict with getProgramAccountsV2, just a trivial rebase either way.
• PR [docs-agent] Weekly skills update 2026-09-09 #48 (2026-09-09) touches wallets-wallet-apis.md (Sept-21 correction, capabilities.eip7702Auth.version selector, accountId()). Not touched this week — main's current EIP-7702 wording is close enough that docs PR #1642 (past-tense reword this week) doesn't require an incremental skill edit; when PR [docs-agent] Weekly skills update 2026-09-09 #48 lands its more complete coverage supersedes.
• PR [docs-agent] Weekly skills update 2026-09-16 #50 (2026-09-16) touches solana-rpc.md (adds getTokenAccountsByOwnerV2) and operational-supported-networks.md (Arc Mainnet). This week's solana-rpc.md addition sits at a different anchor — trivial rebase either way. operational-supported-networks.md is not touched this week.

Not material this week (skipped, confirmed)

• docs#1621, #1622, #1623 — already covered by open weekly PR [docs-agent] Weekly skills update 2026-09-16 #50.
• docs#1631 (category marked required on alchemy_getAssetTransfers) — the Transfers API skill file already documents category as required, so the docs change catches up to reality rather than the other way round.
• docs#1633 (Notify webhook network enum expanded by 29 chains) — chain-list-rot rule: skills don't enumerate the webhook network enum, so no drift.
• docs#1642 (EIP-7702 default flip note rewritten past-tense) — main's wallets-wallet-apis.md already reads as past-tense; PR [docs-agent] Weekly skills update 2026-09-09 #48's more complete coverage supersedes when it lands.
• docs#1624, #1625, #1629, #1640, #1641, #1646 — Daikon spec/server-endpoint updates. Always skip per playbook.

Requested by

Cron heartbeat (weekly-skills-update) — no Slack originator.