the402 x402 endpoint directory

Echo text with length (probe channel 2). Call when you verify a second pay→deliver path with a trivial payload. Return

Echo text with length (probe channel 1). Call when you verify x402 pay→deliver wiring with a trivial payload. Returns

Whole days between two ISO dates. Call when you compute agent SLA windows or age. Returns days and ok for $0.001 USDC

Month name from ISO date. Call when you label agent reports by month. Returns month and ok for $0.001 USDC via x402 on

Weekday name from ISO date. Call when you label agent calendars without locale libs. Returns weekday and ok for $0.001

Convert ISO-8601 to unix seconds. Call when you feed agent schedules into epoch math. Returns unix, iso, ok for $0.001

Convert unix seconds to ISO-8601 Z. Call when you normalize agent timestamps for logs. Returns iso and unix for $0.001

Compare two semver triples (-1,0,1). Call when you decide upgrade direction for agent packages. Returns cmp and ok for

Parse major.minor.patch from a semver string. Call when you compare agent dependency versions without a full parser. R

Validate environment variable key shape A-Z0-9 underscore — first-party local utility for agent preflight and proven m

16-hex fingerprint of text via SHA-256 prefix. Call when you need short cache keys for agent content. Returns fingerpr

Base64url-decode text (padding optional). Call when you reverse URL-safe tokens held by agents. Returns decoded text a

Base64url-encode text without padding. Call when you build JWT-like segments or URL-safe tokens. Returns encoded text

Canonical SHA-256 of JSON-stable payload. Call when you fingerprint agent objects independent of key order. Returns he

Convert #rrggbb to RGB channels. Call when you bridge CSS hex into agent numeric color ops. Returns r,g,b and valid fo

Convert RGB channels to #rrggbb. Call when you bridge agent RGB pickers to CSS hex. Returns hex and channels for $0.00

Normalize #RGB/#RRGGBB color hex. Call when you canonicalize agent color tokens for CSS. Returns normalized #rrggbb or

Parse float with default on failure. Call when you need fail-soft float parsing for agent inputs. Returns value and ok

Parse int with default on failure. Call when you need fail-soft integer parsing for agent inputs. Returns value and ok

Check whether a string is a float. Call when you validate decimal form fields before parse. Returns valid boolean for

Check whether a string is a signed integer. Call when you validate numeric form fields before parse. Returns valid boo

Map object keys to JSON type names. Call when you audit agent payload shapes before schema checks. Returns types map f

Pick only keys that exist on an object. Call when you whitelist agent fields without inventing missing keys. Returns o

Safe length of a list/JSON array. Call when you measure agent arrays before batching. Returns length integer for $0.00

Pick a dotted path from a JSON object. Call when you extract nested agent fields without a full JSONPath engine. Retur

Check whether value is a JSON array. Call when you validate agent payloads before list ops. Returns boolean result for

Check whether value is a JSON object. Call when you validate agent payloads before object ops. Returns boolean result

JSON type name for a value. Call when you branch agent logic by runtime JSON type. Returns type string for $0.001 USDC

Check empty object from value. Call when you detect empty JSON bodies in agent pipelines. Returns empty boolean for $0

Zip key and value lists into an object. Call when you rebuild maps from parallel agent arrays. Returns object and coun

Rename a single object key. Call when you adapt agent field names between systems. Returns renamed object for $0.001 U

Omit keys from an object. Call when you strip secrets before agent logging. Returns filtered object and size for $0.00

Shallow-merge two objects (b wins). Call when you overlay agent defaults with overrides. Returns merged object and siz

Get object[key] with default. Call when you read optional agent JSON fields safely. Returns value, key, found for $0.0

Check whether an object has a key. Call when you preflight required fields before paid calls. Returns has boolean and

Check whether an object is empty. Call when you gate agent workflows on empty JSON bodies. Returns empty flag and size

Count object keys. Call when you size agent payloads before paying. Returns size integer for $0.001 USDC via x402 on B

List object values. Call when you extract value bags from agent JSON. Returns values and count for $0.001 USDC via x40

List object keys. Call when you introspect agent-held JSON objects. Returns keys and count for $0.001 USDC via x402 on

Check whether list a is subset of list b. Call when you verify required tags are present in agent sets. Returns subset

Set difference a - b. Call when you remove blocked IDs from agent candidate lists. Returns difference items and count

Set intersection of two lists. Call when you find shared agent tags/IDs. Returns intersection items and count for $0.0

Set union of two lists (order-preserving). Call when you merge agent allowlists. Returns union items and count for $0.

Drop null/empty values from a list. Call when you clean agent arrays before serialization. Returns compacted items, co

Deduplicate a list preserving order. Call when you unique agent keys without sorting. Returns unique items and count f

Sort a list as strings. Call when you order agent-held labels stably. Returns sorted strings and count for $0.001 USDC

Sort a list numerically. Call when you order agent-held scores or prices. Returns sorted numbers and count for $0.001

Reverse a list. Call when you need reverse chronological agent logs. Returns reversed items and count for $0.001 USDC

Drop the first N elements. Call when you skip headers or already-processed agent rows. Returns remaining items and cou

Take the first N elements. Call when you cap agent payloads before paid calls. Returns items prefix and count for $0.0