docs: add Ethereum to supported-chain table and capabilities list

[shreyav]

Summary

Adds Ethereum to the two places that already enumerate supported chains and were missing it. Docs-only, 2 files, +2/-1.

Page	Change
mintlify/snippets/sending/cross-currency.mdx	Ethereum | USDC, USDT row in the supported blockchains table
mintlify/platform-overview/introduction/platform-capabilities.mdx	Ethereum added to the self-custody wallet list

Both generated bundles (openapi.yaml, mintlify/openapi.yaml) are byte-identical to main.

Why only these two

An earlier revision of this PR also added an Ethereum L1 example to snippets/external-accounts.mdx and an Ethereum funding accordion to snippets/internal-accounts.mdx. Both were dropped in bbfeb06.

The two remaining changes fix incomplete enumerations. The blockchains table already had Base, Tron, Polygon, Lightning and Spark rows; the capabilities list already read "Spark, Solana, Tron, Base, Polygon, etc." Ethereum was supported and simply absent from both, so adding it makes them correct.

The two dropped changes were a different case. Neither of those pages documents any wallet type other than Spark — BASE_WALLET, POLYGON_WALLET, PLASMA_WALLET, SOLANA_WALLET and TRON_WALLET appear nowhere in external-accounts.mdx. Adding an Ethereum-only example there would read as a curated list of the two chains Grid supports, rather than two entries from a set of seven. That's arguably worse than the current silence.

Follow-up this leaves open

external-accounts.mdx documents 1 of 7 wallet external-account types. Base, Polygon, Plasma, Solana, Tron and Ethereum are all undocumented there, and none of their schemas carry x-internal, deprecated, or a beta marker — the omission looks incidental, not deliberate. They should be written up as one set, with per-chain asset support derived from each Payment<Chain>WalletInfo.yaml enum rather than assumed (they differ: Ethereum is [USDC, USDT], Base and Polygon are USDC-only).

Separately, and outside the scope of a docs PR: components/grid-visualizer/src/data/crypto.ts lists ETHEREUM_WALLET only under USDT and omits it from USDC, which contradicts PaymentEthereumWalletInfo.yaml declaring enum: [USDC, USDT].

Verification

• All changed MDX compiles cleanly against the @mdx-js/mdx compiler bundled with mintlify@4.2.284; mintlify broken-links reports no broken links in the touched files.
• make lint fails on main as well — npx spectral lint errors with spectral: not found because npm resolves a stub spectral@0.0.0 instead of @stoplight/spectral-cli. Pre-existing and reproducible on a clean checkout; distinct from the separately-broken lint-markdown. The step that does run, @redocly/cli lint, passes with 50 pre-existing warnings.
• Not verified: no visual render check. The Mintlify preview deploy is worth a look at the table row.

Supersedes the documentation portion of #288, whose Grid Visualizer changes already landed on main via later syncs.

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
grid-flow-builder	Ignored	Preview	Jul 30, 2026 9:52pm
grid-wallet-demo	Ignored	Preview	Jul 30, 2026 9:52pm

[mintlify]

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Project	Status	Preview	Updated (UTC)
Grid	🟢 Ready	View Preview	Jul 30, 2026, 8:26 PM

[greptile-apps]

Greptile Summary

Documents Ethereum L1 wallet support across Grid’s developer documentation.

• Adds an ETHEREUM_WALLET external-account creation example for USDC and USDT.
• Adds Ethereum funding instructions for internal accounts.
• Lists Ethereum as a supported USDC and USDT network for cross-currency funding.
• Adds Ethereum to the platform’s self-custody wallet capabilities.

Confidence Score: 5/5

The documentation-only PR appears safe to merge with no actionable defects identified.

The new Ethereum account and funding documentation agrees with the repository’s wallet schemas, supported USDC/USDT asset combinations, and established Mintlify patterns.

Important Files Changed

Filename	Overview
mintlify/platform-overview/introduction/platform-capabilities.mdx	Adds Ethereum to the self-custody network list consistently with the surrounding network terminology.
mintlify/snippets/external-accounts.mdx	Adds a schema-consistent Ethereum L1 external-account example and an appropriate wrong-network warning.
mintlify/snippets/internal-accounts.mdx	Documents Ethereum funding instructions using the supported ETHEREUM_WALLET account type and USDC/USDT assets.
mintlify/snippets/sending/cross-currency.mdx	Adds Ethereum’s supported stablecoins to the existing blockchain funding matrix.

_{Reviews (1): Last reviewed commit: "docs: document Ethereum L1 external acco..." | Re-trigger Greptile}