Every agent-payable API.

EU VAT decision engine for invoicing and e-invoicing: determines place of supply, reverse charge, intra-Community supply, export or domestic VAT, returns the rate and the EN 16931 / UNCL5305 VAT category code (BT-151) plus exemption reason code (BT-121) and ready-to-use invoice wording (EN/DE) with the legal article reference. For XRechnung, ZUGFeRD, Peppol BIS and OSS workflows.

EU VAT decision engine for invoicing and e-invoicing: determines place of supply, reverse charge, intra-Community supply, export or domestic VAT, returns the rate and the EN 16931 / UNCL5305 VAT category code (BT-151) plus exemption reason code (BT-121) and ready-to-use invoice wording (EN/DE) with the legal article reference. For XRechnung, ZUGFeRD, Peppol BIS and OSS workflows.

EVM address checksum and validation tool — normalize one Ethereum-compatible address and validate mixed-case EIP-55 input offline.

Strict Solidity ABI calldata decoder — decode canonical EVM smart-contract function calls or typed values, verify selectors, and reject ambiguous offsets or padding.

Solana Program Derived Address (PDA) calculator — derive the canonical off-curve address and bump from bounded public seeds offline, without RPC or key handling.

Keccak Merkle proof verifier — validate inclusion plus exact leaf index and count proof shape for the Atlas sorted-pair tree profile.

Keccak Merkle tree and proof builder — generate indexed sorted-pair inclusion proofs with domain separation and explicit odd-node promotion.

Solidity ABI calldata encoder — encode canonical typed values for an EVM smart-contract function call, with an optional selector and exact 256-bit integers.

CREATE2 deterministic contract address calculator — derive the EIP-1014 EVM deployment address, preimage, hashes, and EIP-55 checksum offline without RPC.

EVM Access List Shape Check: EVM Access List Shape Check checks bounded EIP-2930 access-list address and storage-key shapes from bounded caller-supplied values without an external provider. Call EVM Access List Shape Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Access List Shape Check as versioned determin…

EVM Address List Dedupe: EVM Address List Dedupe deduplicates EVM address strings case-insensitively while preserving order from bounded caller-supplied values without an external provider. Call EVM Address List Dedupe before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Address List Dedupe as versioned deterministic JS…

Lowercase-normalize EVM address shape without EIP-55 checksum work. Call when deduping addresses from mixed-case sources before storage or compare. Returns normalized lowercase address plus validity flag as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

EVM Address Zero Check: EVM Address Zero Check detects the all-zero EVM address after shape normalization from bounded caller-supplied values without an external provider. Call EVM Address Zero Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Address Zero Check as versioned deterministic JSON. Price: $0.001 US…

EVM Allowance Budget Check: EVM Allowance Budget Check checks caller-supplied allowance against a required token amount from bounded caller-supplied values without an external provider. Call EVM Allowance Budget Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Allowance Budget Check as versioned deterministic…

EVM Amount Min Check: EVM Amount Min Check checks an actual raw amount against a minimum raw amount from bounded caller-supplied values without an external provider. Call EVM Amount Min Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Amount Min Check as versioned deterministic JSON. Price: $0.001 USDC via x40…

EVM Approve Amount Check: EVM Approve Amount Check compares a proposed approval with an explicit spending requirement and cap from bounded caller-supplied values without an external provider. Call EVM Approve Amount Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Approve Amount Check as versioned deterministi…

EVM Base Fee Growth Ceiling: EVM Base Fee Growth Ceiling compounds a caller growth fraction across future blocks from bounded caller-supplied values without an external provider. Call EVM Base Fee Growth Ceiling before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Base Fee Growth Ceiling as versioned deterministic JSON.…

EVM Batch Duplicate Nonce Check: EVM Batch Duplicate Nonce Check finds duplicate nonces inside a caller-supplied transaction batch from bounded caller-supplied values without an external provider. Call EVM Batch Duplicate Nonce Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Batch Duplicate Nonce Check as ver…

EVM Batch Gas Sum: EVM Batch Gas Sum sums gas limits and fee ceilings across a transaction batch from bounded caller-supplied values without an external provider. Call EVM Batch Gas Sum before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Batch Gas Sum as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base…

EVM Batch Value Sum: EVM Batch Value Sum sums bounded raw transaction values for a batch funding view from bounded caller-supplied values without an external provider. Call EVM Batch Value Sum before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Batch Value Sum as versioned deterministic JSON. Price: $0.001 USDC via x40…

EVM Blob Count Check: EVM Blob Count Check checks caller-supplied blob count against a transaction limit from bounded caller-supplied values without an external provider. Call EVM Blob Count Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Blob Count Check as versioned deterministic JSON. Price: $0.001 USDC vi…

EVM Blob Fee Budget: EVM Blob Fee Budget calculates a worst-case blob fee from blob gas and fee cap from bounded caller-supplied values without an external provider. Call EVM Blob Fee Budget before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Blob Fee Budget as versioned deterministic JSON. Price: $0.001 USDC via x402…

EVM Block Age Check: EVM Block Age Check checks caller-supplied block timestamp age against a freshness budget from bounded caller-supplied values without an external provider. Call EVM Block Age Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Block Age Check as versioned deterministic JSON. Price: $0.001 USD…

EVM Calldata Selector Extract: EVM Calldata Selector Extract extracts the first four calldata bytes as a selector from bounded caller-supplied values without an external provider. Call EVM Calldata Selector Extract before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Calldata Selector Extract as versioned deterministic…

EVM Calldata Shape Check: EVM Calldata Shape Check checks 0x-prefixed calldata for even-length hexadecimal bytes from bounded caller-supplied values without an external provider. Call EVM Calldata Shape Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Calldata Shape Check as versioned deterministic JSON. Price…

EVM Calldata Size Bytes: EVM Calldata Size Bytes calculates calldata byte length from normalized hex from bounded caller-supplied values without an external provider. Call EVM Calldata Size Bytes before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Calldata Size Bytes as versioned deterministic JSON. Price: $0.001 USDC…

EVM Calldata Word Count: EVM Calldata Word Count counts complete and partial 32-byte calldata words after the selector from bounded caller-supplied values without an external provider. Call EVM Calldata Word Count before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Calldata Word Count as versioned deterministic JSON. P…

EVM Chain Id Hex Normalize: EVM Chain Id Hex Normalize converts decimal or hexadecimal chain identifiers into both forms from bounded caller-supplied values without an external provider. Call EVM Chain Id Hex Normalize before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Chain Id Hex Normalize as versioned deterministic…

EVM Chain Match Check: EVM Chain Match Check compares transaction and expected chain identifiers from bounded caller-supplied values without an external provider. Call EVM Chain Match Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Chain Match Check as versioned deterministic JSON. Price: $0.001 USDC via x402…

EVM Confirmation Count: EVM Confirmation Count calculates confirmations from inclusion and current block numbers from bounded caller-supplied values without an external provider. Call EVM Confirmation Count before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Confirmation Count as versioned deterministic JSON. Price: $0…

EVM Contract Creation Check: EVM Contract Creation Check classifies an empty or absent to-address as contract creation from bounded caller-supplied values without an external provider. Call EVM Contract Creation Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Contract Creation Check as versioned deterministic…

EVM Deadline Check: EVM Deadline Check checks a transaction deadline against current time and minimum lead time from bounded caller-supplied values without an external provider. Call EVM Deadline Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Deadline Check as versioned deterministic JSON. Price: $0.001 USDC…

EVM Eip1559 Fee Check: EVM Eip1559 Fee Check checks dynamic-fee caps and calculates the worst-case transaction fee from bounded caller-supplied values without an external provider. Call EVM Eip1559 Fee Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Eip1559 Fee Check as versioned deterministic JSON. Price: $0…

EVM Event Log Shape Check: EVM Event Log Shape Check checks address, topics, and data shapes for a caller-supplied log from bounded caller-supplied values without an external provider. Call EVM Event Log Shape Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Event Log Shape Check as versioned deterministic JSO…

EVM Fee Cap Order Check: EVM Fee Cap Order Check checks that the priority fee cap does not exceed the total fee cap from bounded caller-supplied values without an external provider. Call EVM Fee Cap Order Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Fee Cap Order Check as versioned deterministic JSON. Pric…

EVM Finality Depth Check: EVM Finality Depth Check checks confirmation count against a caller-required depth from bounded caller-supplied values without an external provider. Call EVM Finality Depth Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Finality Depth Check as versioned deterministic JSON. Price: $0…

EVM Gas Cost Ceiling: EVM Gas Cost Ceiling calculates a worst-case native fee from gas limit and fee cap from bounded caller-supplied values without an external provider. Call EVM Gas Cost Ceiling before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Gas Cost Ceiling as versioned deterministic JSON. Price: $0.001 USDC vi…

EVM Gas Limit Headroom: EVM Gas Limit Headroom calculates gas-limit headroom above an estimated gas amount from bounded caller-supplied values without an external provider. Call EVM Gas Limit Headroom before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Gas Limit Headroom as versioned deterministic JSON. Price: $0.001 U…

Current gas prices for Base or Ethereum mainnet: legacy gas price, EIP-1559 base fee and suggested priority fee (all gwei), plus the latest block number. Query: chain (base | ethereum, default base). Real-time from public RPC. Use to time on-chain transactions, estimate costs, and monitor fee spikes.

EVM Hex Data Normalize: EVM Hex Data Normalize normalizes even-length EVM hex data while preserving byte boundaries from bounded caller-supplied values without an external provider. Call EVM Hex Data Normalize before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Hex Data Normalize as versioned deterministic JSON. Price:…

EVM Hex Quantity Normalize: EVM Hex Quantity Normalize normalizes an EVM hex quantity without redundant leading zeroes from bounded caller-supplied values without an external provider. Call EVM Hex Quantity Normalize before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Hex Quantity Normalize as versioned deterministic J…

EVM Infinite Approval Flag: EVM Infinite Approval Flag flags an approval at or near a caller-supplied maximum uint threshold from bounded caller-supplied values without an external provider. Call EVM Infinite Approval Flag before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Infinite Approval Flag as versioned determini…

Compute the keccak256 hash and 4-byte function selector of a signature string, and optionally ABI-decode raw hex calldata given an ordered list of static Solidity types.

EVM Legacy Fee Check: EVM Legacy Fee Check checks gasPrice and gasLimit values for a legacy transaction budget from bounded caller-supplied values without an external provider. Call EVM Legacy Fee Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Legacy Fee Check as versioned deterministic JSON. Price: $0.001 U…

EVM Log Topic Count Check: EVM Log Topic Count Check checks log topic count against an expected bound from bounded caller-supplied values without an external provider. Call EVM Log Topic Count Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Log Topic Count Check as versioned deterministic JSON. Price: $0.001…

EVM Multisend Recipient Check: EVM Multisend Recipient Check checks duplicate, zero, and unexpected recipients in a multisend from bounded caller-supplied values without an external provider. Call EVM Multisend Recipient Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Multisend Recipient Check as versioned de…

EVM Native Balance Budget: EVM Native Balance Budget checks caller-supplied native balance against value plus fee reserve from bounded caller-supplied values without an external provider. Call EVM Native Balance Budget before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Native Balance Budget as versioned deterministic…

EVM Next Base Fee Bound: EVM Next Base Fee Bound calculates upper and lower next-block base-fee bounds from bounded caller-supplied values without an external provider. Call EVM Next Base Fee Bound before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Next Base Fee Bound as versioned deterministic JSON. Price: $0.001 USD…

EVM Nonce Gap Check: EVM Nonce Gap Check calculates the gap between pending and proposed transaction nonces from bounded caller-supplied values without an external provider. Call EVM Nonce Gap Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Nonce Gap Check as versioned deterministic JSON. Price: $0.001 USDC v…

EVM Nonce Replace Check: EVM Nonce Replace Check checks whether a proposed nonce targets a caller-supplied pending nonce from bounded caller-supplied values without an external provider. Call EVM Nonce Replace Check before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Nonce Replace Check as versioned deterministic JSON.…