the402 x402 endpoint directory

Pluck a key from a list of objects. Call when you extract IDs/fields from agent-held JSON arrays. Returns values list

Flatten one level of nested lists. Call when you normalize agent-held nested arrays before mapping. Returns flattened

Chunk a list into fixed-size batches. Call when you plan batch POSTs under payload ceilings. Returns chunks array and

Coerce a list of tokens into booleans. Call when you normalize yes/no flags from agent forms. Returns boolean list and

Compare two strings lexicographically (-1, 0, 1). Call when you sort or branch on agent string keys. Returns cmp resul

Turn slugs into Title Case words. Call when you reverse product/path slugs into display labels. Returns title words fr

Lightweight English pluralization helper. Call when you label counts in agent messages without i18n frameworks. Return

Convert kebab-case identifiers to lowerCamelCase. Call when you map URL segments into JS property names. Returns lower

Convert camelCase identifiers to kebab-case. Call when you map JS props to CSS/URL tokens. Returns kebab-case text for

Join fields into a CSV row with proper quoting. Call when you emit CSV without a spreadsheet library. Returns CSV row

Join fields into a TSV row. Call when you emit tab-separated rows from agent field lists. Returns TSV row string and f

CSV-escape a single field. Call when you build CSV rows from agent fields with commas/quotes. Returns escaped field an

Unique and sort a JSON list. Call when you need stable unique keys for agent set math. Returns sorted unique items and

Split text into lines. Call when you need per-line processing without local split bugs. Returns lines array and count

Join an array of lines with a separator. Call when you reassemble agent-held line lists for prompts or files. Returns

Slugify text to lowercase hyphen form. Call when you need product/path slugs from free titles. Returns slug string for

JSON-escape a string (without surrounding quotes). Call when you embed text into a larger JSON template safely. Return

Truncate long text in the middle with an ellipsis. Call when you keep start+end context inside UI/log width limits. Re

Remove common leading whitespace from lines. Call when you normalize agent-held code fences or YAML blocks. Returns de

Indent every line by N spaces. Call when you format nested blocks for agent prompts or diffs. Returns indented multili

Extract email-shaped tokens from free text (shape only). Call when you need candidate emails from agent-held text with

Extract signed integers from free text. Call when you parse IDs, ports, or quantities out of messy agent logs. Returns

Compute character frequency top counts. Call when you inspect distribution before encoding or compression steps. Retur

Right-pad a string to a target width. Call when you need fixed-width columns for agent logs. Returns padded text and w

Left-pad a string to a target width. Call when you need fixed-width IDs or zero-padded codes. Returns padded text and

Repeat a string a bounded number of times. Call when you build padding/test fixtures without local loops. Returns repe

Find first index of a substring. Call when you need slice boundaries for agent text surgery. Returns index and found f

Check whether text contains a needle (optional ignore_case). Call when you need a cheap membership check on agent-held

Check whether text ends with a suffix. Call when you validate file extensions or content-type suffixes. Returns boolea

Check whether text starts with a prefix. Call when you gate URL/scheme or header prefix checks before egress. Returns

Count non-overlapping substring occurrences. Call when you preflight how often a token appears in agent-held text. Ret

Swap letter case for deterministic transform tests. Call when you need a pure case flip without locale rules. Returns

Title-case words for headings and display labels. Call when you need human-readable titles from slug/identifier tokens

Convert free text or identifiers to CONST_CASE. Call when you normalize env var names or enum labels for agent config.

Convert free text or identifiers to kebab-case slugs. Call when you need URL path segments, CSS class names, or route

Convert snake_case identifiers to lowerCamelCase. Call when you map API/DB columns into JS object keys for an agent pa

Convert camelCase or PascalCase identifiers to snake_case. Call when you need stable Python/JSON field names from JS-s

Ensure a string ends with a required suffix without duplication — first-party local utility for agent preflight and pr

Ensure a string starts with a required prefix without duplication — first-party local utility for agent preflight and

Detect blank or whitespace-only strings before paying downstream — first-party local utility for agent preflight and p

Split a CSV line into fields with basic quote awareness — first-party local utility for agent preflight and proven mic

Pad a string to a target width with a fill character — first-party local utility for agent preflight and proven micro-

Return object keys sorted lexicographically for stable hashes — first-party local utility for agent preflight and prov

Deduplicate a list while preserving first-seen order — first-party local utility for agent preflight and proven micro-

Convert text to lowerCamelCase for JSON property naming — first-party local utility for agent preflight and proven mic

Convert text to snake_case for API fields and file stems — first-party local utility for agent preflight and proven mi

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