the402 x402 endpoint directory

Generate a random hex nonce. Call when you need request nonces for agent idempotency keys. Returns hex nonce and byte

HMAC-SHA256 hex of text with a secret. Call when you sign agent webhook test payloads offline. Returns hex digest for

MD5 hex digest of text. Call when you match legacy content hashes (not for security). Returns hex digest for $0.001 US

SHA-1 hex digest of text. Call when you interoperate with legacy agent checksums. Returns hex digest for $0.001 USDC v

SHA-256 hex digest of text. Call when you need content fingerprints for agent cache keys. Returns hex digest for $0.00

Mask a digit string keeping last4. Call when you display agent-held card-shaped numbers safely. Returns masked and las

Luhn check for digit strings (cards/IDs). Call when you reject obviously invalid card-shaped numbers before payment UI

Detect private/loopback IPv4. Call when you block private egress targets in agent allowlists. Returns valid and privat

Validate UUID string shape. Call when you check correlation IDs before storage keys. Returns valid boolean for $0.001

Validate email shape (not mailbox existence). Call when you cheaply reject obvious non-emails before enrichment. Retur

Replace email-shaped tokens with a redaction marker. Call when you scrub emails from agent-held text before logging. R

Replace digits with # for safe previews. Call when you strip numeric PII from agent-held text before display. Returns

Percent-decode text. Call when you reverse query encoding from agent-held URLs. Returns decoded text for $0.001 USDC v

Strip HTML tags from caller-held markup. Call when you need plain text from agent-held HTML snippets without a browser

Extract file extension from a path or URL path segment — first-party local utility for agent preflight and proven micr

Extract basename from a URL or path-like string — first-party local utility for agent preflight and proven micro-utils

Join URL or filesystem-like path segments without traversal escape — first-party local utility for agent preflight and

Clamp an integer into an inclusive min/max range — first-party local utility for agent preflight and proven micro-util

Pick a shallow whitelist of keys from a JSON object — first-party local utility for agent preflight and proven micro-u

Return length of a JSON array or separator-split string list — first-party local utility for agent preflight and prove

Truncate a string to max_chars with optional ellipsis — first-party local utility for agent preflight and proven micro

Coerce common truthy/falsey tokens into a boolean — first-party local utility for agent preflight and proven micro-uti

Trim ends and collapse internal whitespace runs to single spaces — first-party local utility for agent preflight and p

Count lines in caller-held text with nonempty breakdown — first-party local utility for agent preflight and proven mic

Extract scheme://host[:port] origin from a URL without network access — first-party local utility for agent preflight

Chunk a JSON array. Use to batch tool calls, page results, or stay under payload limits. Returns array chunks with the

Parse truthy/falsey strings. Call when agents ingest messy flags like yes/no/1/0/true from tools or forms. Returns a b

URL-encode a component. Use before building query strings or safe path segments. Returns encodeURIComponent-style outp

Parse a URL into parts. Call when splitting host, path, query, and fragment without fetching the URL. Returns structur

CSV header row. Use to map columns before import or transformation steps. Returns the first-row headers as a list. $0.

Count CSV rows. Call when estimating import size or validating uploads mid-pipeline. Returns row count for UTF-8 CSV t

JSON root type and size. Use as a cheap preflight before heavier JSON processing. Returns root type (object/array/…) a

List top-level JSON keys. Call when agents must discover object shape without full schema inference. Returns top-level

Minify JSON. Use to shrink payloads before cache, transport, or signature steps. Returns compact JSON text without cha

Pretty-print JSON. Call before showing configs to humans or attaching readable debug dumps. Returns indented JSON text

Age in whole years. Use for eligibility checks and profile enrichment from a birthdate. Returns whole-year age from an

Next weekday occurrence. Call when scheduling the next Monday standup or Friday ship window. Returns the next date mat

Calendar quarter 1–4. Use for finance-style bucketing and quarterly goals tracking. Returns quarter number 1–4 for the

ISO week number. Call for weekly reporting buckets and standup cadence keys. Returns ISO week number (and year context

Leap year check. Use for date validation and calendar math without external data. Returns a boolean leap-year result f

Weekend check for a date. Call when routing work, quiet hours, or business-day logic in agents. Returns whether the da

Current UTC unix time. Use for idempotency stamps, expiring links, or clock skew checks. Returns unix seconds, millis,

Format an ISO date. Call when agents need a simple display pattern for reports or messages. Returns a formatted date s

Difference between two dates. Use for aging tickets, session duration, or SLA breach math. Returns the delta between t

Add time to an ISO date. Call for deadlines, reminders, and SLA offsets without timezone libraries. Returns the shifte

Parse size strings to bytes. Use when users type 1.5MB and your pipeline needs an integer byte budget. Returns integer

Human-readable byte sizes. Call when presenting file sizes, cache usage, or download progress to users. Returns a huma

Percentile of a list. Use for p50/p95 style summaries without a stats stack. Returns the requested percentile of a num

Standard deviation. Call for simple volatility or spread checks on agent-collected samples. Returns population/sample

Median of numbers. Use for robust central tendency when outliers pollute averages. Returns the median of the provided