the402 x402 endpoint directory

Seeded Kfold Split: Seeded Kfold Split assigns item indices to reproducible cross-validation folds from bounded caller

Seeded Train Test Split: Seeded Train Test Split splits items into reproducible train and test sets from bounded calle

Seeded Partition: Seeded Partition assigns each caller item reproducibly into a named partition from bounded caller-su

Seeded Weighted Sample: Seeded Weighted Sample samples unique items using caller weights without replacement from boun

Seeded Weighted Choice: Seeded Weighted Choice selects one item using non-negative caller weights from bounded caller-

Seeded Shuffle: Seeded Shuffle produces a reproducible permutation of caller items from bounded caller-supplied values

Estimate bytes/tokens for a handoff capsule string. Call when Protocol-adjacent sizing before free handoff storage. Re

Next N daily fires from a DAILY RRULE-like interval. Call when expanding simple daily recurrences offline. Returns nex

Next N hourly fires from a simple '0 * * * *' style hour cron. Call when scheduling previews for basic hourly/daily cr

Decode JWT payload claims without signature verify. Call when inspecting exp/iat for debugging (untrusted decode). Ret

Count allow/disallow rules from robots.txt text. Call when crawl budget planning from a robots body you already fetche

Sniff PDF magic and approximate size from base64 prefix. Call when rejecting non-PDF uploads before heavy OCR. Returns

Relative luminance of a #RRGGBB color. Call when contrast checks without image decode. Returns luminance as determinis

SHA-256 of base64-decoded bytes. Call when hashing binary payloads agents already hold as base64. Returns sha256 and n

SHA-256 hex digest of UTF-8 text. Call when content addressing or dupe keys for text. Returns sha256 as deterministic

Classify a decoded QR/barcode string (url/text/wifi heuristic). Call when routing decoded QR payloads without imaging.

Validate BIC/SWIFT format shape (8 or 11 alnum). Call when preflight for bank routing fields. Returns valid boolean as

Validate IBAN checksum (mod 97) offline. Call when payment form validation without banking APIs. Returns valid boolean

Normalize phone digits toward E.164-like form. Call when standardizing phone inputs for agents. Returns e164_candidate

Heuristic disposable mailbox domain flag from a static list. Call when cheap disposable email filter without external

Validate basic email syntax and split local/domain. Call when preflight before MX/DNS steps. Returns ok, local, domain

Extract issue/issuewild hosts from CAA record texts. Call when inventorying allowed CAs from CAA answers. Returns host

Parse DMARC p= and rua= fields from a TXT record. Call when extracting DMARC policy from a caller-supplied record. Ret

Detect common SPF mechanisms present in a TXT record. Call when quick SPF mechanism inventory without DNS lookup. Retu

Parse MX preference and host from an MX record string. Call when normalizing DNS MX answers for deliverability logic.

Reliability diagram points (mean forecast vs hit rate per bin). Call when plotting calibration without a notebook stac

Expected calibration error from forecast/outcome pairs. Call when scoring probability model calibration offline. Retur

Strip proportional vig from two-way decimal odds to fair probs. Call when fair probability recovery from a two-way boo

Convert among decimal/american/fractional odds and implied prob. Call when normalizing mixed book formats into one pro

Proportional Kelly-like stakes across exclusive outcomes. Call when allocating bankroll across multi-outcome predictio

Normalize multi-outcome prices into a probability simplex. Call when turning raw multi-outcome quotes into probs that

Approx expected log bankroll growth for a binary bet fraction. Call when comparing bet sizes by growth rate under true

Odds ratio p/(1−p) from a probability. Call when classic odds-ratio features and diagnostics. Returns odds ratio as de

Sigmoid 1/(1+e^{−x}) back to probability space. Call when mapping model scores into probabilities without ML framework

Logit transform log(p/(1−p)) for probability-space models. Call when featureizing probabilities for linear models offl

Clamp a probability into (eps, 1−eps) for stable odds/math. Call when preventing 0/1 probs from blowing up logs and od

Stake size from bankroll and fraction (Kelly or fixed-f). Call when turning a fraction into dollars to risk this bet.

Kelly fraction for a binary market given edge and price. Call when sizing prediction-market bets with Kelly under your

Profit if YES resolves after cost basis on shares. Call when net PnL on a YES position at resolution. Returns net prof

Payout if YES resolves given shares held (\$1/share style). Call when estimating gross payout on a YES position at res

Cash cost to buy a target share count at price. Call when pre-trade cash check for prediction-market size targets. Ret

Shares purchasable for a budget at a given share price. Call when sizing prediction-market orders from cash budget. Re

ROI from entry price and resolution payout on a binary share. Call when post-resolution performance of a prediction-ma

Normalize yes/no prices into implied probabilities. Call when two-sided prediction markets quoted as separate yes and

Bucket a probability into a calibration bin for reliability charts. Call when building simple calibration histograms f

Log loss (cross-entropy) for a probability vs binary outcome. Call when training-style forecast quality when sharp mis

Brier score for a probabilistic forecast vs binary outcome. Call when scoring prediction calibration on resolved marke

De-vig a two-way market into fair probabilities that sum to 1. Call when recovering fair probs from a two-outcome book

Overround/vig from a set of mutually exclusive implied probs. Call when measuring book margin before de-vigging. Retur

Combine independent decimal odds into parlay decimal odds. Call when building multi-leg prices from per-leg decimal od