Ethereum-standard work in one place: deterministic browser workflows that recompute interface ids, royalties, vault shares, permit bindings, UserOperation math, EIP-712 digests and state proofs without a node and without a key. This page is the home of the Ethereum-standard tool family inside the web3 hub family, and every link resolves in-tree. The payments-first networks in the wider family are covered by their own guides.
Each card points at a page on the site today; every workflow is recomputed in the browser with no node call and no key.
Recompute the interface id a contract claims and confirm the selector set that backs it, so a supported-interface claim can be checked before a call depends on it.
Open the workflow →Recompute the royalty a sale owes under the NFT royalty standard and the net proceeds the seller should expect, from the sale price and the royalty settings on the token.
Open the workflow →Recompute share prices, deposits, withdrawals and rounding outcomes for a tokenized vault, so a vault's quoted conversion can be checked independently.
Open the workflow →Account for asynchronous vault requests across claimable, pending and settled states, and flag a request lifecycle that does not balance.
Open the workflow →Verify a permit signature binds to its spender, amount, nonce and deadline, so an approval granted by signature can be checked before it is relayed.
Open the workflow →Recompute the gas, fee and validation fields of a UserOperation, so a bundler's quoted costs and the operation's own claims can be checked side by side.
Open the workflow →Decode and check an authorization tuple for a delegated account: chain id, nonce, contract address, and the signature that authorizes the delegation.
Open the workflow →Classify the standard proxy storage slots for an upgradeable contract, so an implementation, admin or beacon claim can be checked against the layout it must occupy.
Open the workflow →Check a state proof's account and storage walks against a state root, so a claim about on-chain state can be verified from the proof alone.
Open the workflow →Recompute the EIP-712 digest behind an x402 payment authorization and confirm the signature covers the exact terms being relied on.
Open the workflow →Check an agent registry entry against its standard's required fields and signature, so an on-chain agent identity can be trusted only as far as its entry proves.
Open the workflow →Map a payments message onto EVM call data and check the encoding, so a tokenized payment instruction can be compared with the transaction it becomes.
Open the workflow →Reconcile the multiplier fields a tokenized-stock workflow depends on, and flag a reconciliation that leaves a residual between the sources.
Open the workflow →Validate a royalty split's recipients and basis points, so a split pays exactly the shares its agreement names and nothing else.
Open the workflow →Check an NFT's metadata against its standard's structure and required fields, so a token's claimed traits resolve to what its metadata carries.
Open the workflow →Work through the compliance questions a tokenized asset raises and land on the license posture that matches the answers.
Open the tool →Select an NFT license from the Cant Be Evil set by answering the rights questions the license family is built around.
Open the tool →The original browser check for a royalty split's recipients and shares, kept at its long-lived path alongside the workflow that supersedes it.
Open the tool →The original browser check for NFT metadata structure, kept at its long-lived path alongside the workflow that supersedes it.
Open the tool →▶ Run the Robinhood Chain Multiplier Reconciliation Composer: chains the multiplier reconciler's checks into one pass over the reconciled fields.
▶ Run the Shared-Ledger Transfer Readiness Composer: chains calldata mapping and settlement-readiness checks into one receipt.
▶ Run the x402 Spend Evidence Composer: chains the EIP-712 digest recompute and the payment evidence checks into one pack.
▶ Run the x402 Permit2 Sponsored Spend Evidence Composer: chains the Permit2 signature checks for a sponsored spend into one pack.
Last reviewed: October 2026 · guides · Ethereum Hub · v1.0
Teams running tokenized assets who need interface, royalty, vault-share and permit claims recomputed before they rely on them.
Builders shipping account-abstraction flows who check UserOperation economics, delegated authorization, and proxy layouts without a node.
Desks bridging payment messages onto tokenized rails who verify calldata encodings, multipliers, and spend evidence signature by signature.
Part of the web3 hub family: the full directory lives at web3-hub.html.