the402 x402 endpoint directory

Independent parlay probability as product of leg probabilities. Call when rough multi-leg combo probability when assum

Expected value of buying binary NO at (1−yes_price) under true_prob. Call when checking the NO side when YES is mispri

Expected value of buying binary YES at market_price under true_prob. Call when deciding whether a YES buy has positive

Edge = true_prob − market_price for a binary contract. Call when ranking prediction-market opportunities by model edge

Map a true probability into a binary contract fair price in [0,1]. Call when pricing yes/no markets from your probabil

Base Payment Deadline Check: Base Payment Deadline Check checks a Base payment deadline against minimum and maximum le

Base Fee Budget Breakdown: Base Fee Budget Breakdown breaks a Base transaction fee ceiling into gas, priority, and tot

Base Gas Price Staleness: Base Gas Price Staleness checks the age of a caller-supplied gas quote before use from bound

Base Confirmation Eta: Base Confirmation Eta estimates remaining confirmation time from caller-supplied block cadence

Base Block Time Estimate: Base Block Time Estimate estimates block count from a caller-supplied duration and block-tim

Base USDC Decimal Rounding: Base USDC Decimal Rounding checks whether a decimal USDC amount fits six fractional digits

Base USDC Payment Match: Base USDC Payment Match checks recipient, raw amount, and chain id for a Base USDC payment in

Base USDC Recipient Check: Base USDC Recipient Check compares a Base USDC recipient with an expected pay-to address fr

Base USDC Amount Check: Base USDC Amount Check checks a six-decimal USDC raw amount against exact and maximum values f

EVM Signature Rs Shape Check: EVM Signature Rs Shape Check checks r and s values as 32-byte hexadecimal scalars from b

EVM Signature V Classify: EVM Signature V Classify classifies common signature recovery and EIP-155 v values from boun

EVM Chain Id Hex Normalize: EVM Chain Id Hex Normalize converts decimal or hexadecimal chain identifiers into both for

EVM Multisend Recipient Check: EVM Multisend Recipient Check checks duplicate, zero, and unexpected recipients in a mu

EVM Batch Duplicate Nonce Check: EVM Batch Duplicate Nonce Check finds duplicate nonces inside a caller-supplied trans

EVM Batch Gas Sum: EVM Batch Gas Sum sums gas limits and fee ceilings across a transaction batch from bounded caller-s

EVM Batch Value Sum: EVM Batch Value Sum sums bounded raw transaction values for a batch funding view from bounded cal

EVM Replacement Fee Bump: EVM Replacement Fee Bump checks proposed fee caps against a required replacement bump from b

EVM Next Base Fee Bound: EVM Next Base Fee Bound calculates upper and lower next-block base-fee bounds from bounded ca

EVM Base Fee Growth Ceiling: EVM Base Fee Growth Ceiling compounds a caller growth fraction across future blocks from

EVM Blob Count Check: EVM Blob Count Check checks caller-supplied blob count against a transaction limit from bounded

EVM Blob Fee Budget: EVM Blob Fee Budget calculates a worst-case blob fee from blob gas and fee cap from bounded calle

EVM Access List Shape Check: EVM Access List Shape Check checks bounded EIP-2930 access-list address and storage-key s

EVM Contract Creation Check: EVM Contract Creation Check classifies an empty or absent to-address as contract creation

EVM Transfer Recipient Check: EVM Transfer Recipient Check compares an encoded recipient address with the intended rec

EVM Infinite Approval Flag: EVM Infinite Approval Flag flags an approval at or near a caller-supplied maximum uint thr

EVM Approve Amount Check: EVM Approve Amount Check compares a proposed approval with an explicit spending requirement

EVM Allowance Budget Check: EVM Allowance Budget Check checks caller-supplied allowance against a required token amoun

EVM Amount Min Check: EVM Amount Min Check checks an actual raw amount against a minimum raw amount from bounded calle

EVM Slippage Bounds Check: EVM Slippage Bounds Check checks expected and minimum output against a maximum slippage pol

EVM Deadline Check: EVM Deadline Check checks a transaction deadline against current time and minimum lead time from b

EVM Block Age Check: EVM Block Age Check checks caller-supplied block timestamp age against a freshness budget from bo

EVM Finality Depth Check: EVM Finality Depth Check checks confirmation count against a caller-required depth from boun

EVM Confirmation Count: EVM Confirmation Count calculates confirmations from inclusion and current block numbers from

EVM Receipt Gas Variance: EVM Receipt Gas Variance compares gas used with a preflight estimate and reports variance fr

EVM Receipt Status Check: EVM Receipt Status Check normalizes receipt status values into success or failure from bound

EVM Log Topic Count Check: EVM Log Topic Count Check checks log topic count against an expected bound from bounded cal

EVM Hex Data Normalize: EVM Hex Data Normalize normalizes even-length EVM hex data while preserving byte boundaries fr

EVM Hex Quantity Normalize: EVM Hex Quantity Normalize normalizes an EVM hex quantity without redundant leading zeroes

EVM Calldata Size Bytes: EVM Calldata Size Bytes calculates calldata byte length from normalized hex from bounded call

EVM Calldata Word Count: EVM Calldata Word Count counts complete and partial 32-byte calldata words after the selector

EVM Calldata Selector Extract: EVM Calldata Selector Extract extracts the first four calldata bytes as a selector from

EVM Calldata Shape Check: EVM Calldata Shape Check checks 0x-prefixed calldata for even-length hexadecimal bytes from

EVM Value Plus Fee Budget: EVM Value Plus Fee Budget sums transaction value and fee ceiling for a funding requirement

EVM Token Balance Budget: EVM Token Balance Budget checks caller-supplied raw token balance against transfer amount fr

EVM Native Balance Budget: EVM Native Balance Budget checks caller-supplied native balance against value plus fee rese