General Utilities x402 offerings

YAML to JSON. POST a YAML document; the response is pretty-printed JSON. Anchors and aliases are resolved, and a multi-document stream converts as its FIRST document rather than as an array — the dir…

JSON to YAML. POST any JSON value; the response is block-style YAML — the readable, indented form, not flow style. Any top-level shape is accepted, not just an object. There are no comments to preserve in either direction, because JSON has none.

JSON to YAML. POST any JSON value; the response is block-style YAML — the readable, indented form, not flow style. Any top-level shape is accepted, not just an object. There are no comments to preserve in either direction, because JSON has none.

JSON to YAML. POST any JSON value; the response is block-style YAML — the readable, indented form, not flow style. Any top-level shape is accepted, not just an object. There are no comments to preserve in either direction, because JSON has none.

JSON to YAML. POST any JSON value; the response is block-style YAML — the readable, indented form, not flow style. Any top-level shape is accepted, not just an object. There are no comments to preserve in either direction, because JSON has none.

JSON to YAML. POST any JSON value; the response is block-style YAML — the readable, indented form, not flow style. Any top-level shape is accepted, not just an object. There are no comments to preserve in either direction, because JSON has none.

JSON to YAML. POST any JSON value; the response is block-style YAML — the readable, indented form, not flow style. Any top-level shape is accepted, not just an object. There are no comments to preserve in either direction, because JSON has none.

JSON to YAML. POST any JSON value; the response is block-style YAML — the readable, indented form, not flow style. Any top-level shape is accepted, not just an object. There are no comments to preserve in either direction, because JSON has none.

Public holidays for any country and year, plus optional business-day checking. Pass country= (ISO alpha-2) and year=; add date= to learn whether that day is a business day, whether it is a weekend or public holiday, the holiday name, and the next business day. Covers 100+ countries. JSON response. $0.01 USDC per call, pay via x402, no API key.

Pass/fail check: does the text rank within the top `min_rank` categories of its target taxonomy? Returns `pass`, the target's rank and gap to #1, the taxonomy's top five, and the unused phrases to work in. Use it as a content-pipeline gate. Paid, $0.05/call; read-only and safe to retry.

Pass/fail check: does the text rank within the top `min_rank` categories of its target taxonomy? Returns `pass`, the target's rank and gap to #1, the taxonomy's top five, and the unused phrases to wo…

Deterministic time/timezone truth: DST-aware zone conversion, transition times, business-day & holiday math, epoch<->ISO. Free sample, no payment required: GET /play/time

Deterministic unit conversion reproducing NIST SP 811 exact factors (length, mass, volume, energy, power, pressure, force, area, speed, data, angle, frequency + affine temperature). Every answer signed. Free sample, no payment required: GET /play/unit

Deterministic readability scores (Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI) over published formulas. For long text use POST. Signed.

Deterministic, rule-based proofreading flags — passive voice, adverbs, wordiness, filler, repeated words, whitespace, a/an, punctuation, sentence length, capitalization. Each flag carries an offset + suggestion. For long text use POST.

Deterministic four-neighbor BFS on a grid of at most 24×24 cells. Returns a shortest obstacle-free route or an explicit unreachable/step-limit result. Toy discrete geometry only; no hardware, collision certification or physical feasibility claim.

Validate a GTIN-8/12/13/14, UPC-A or EAN-13: check digit, format, GTIN-14 normalization, packaging indicator.

Decode a GS1 element string / GS1-128 / DataMatrix AI payload into structured fields (GTIN, batch, expiry, serial, weights) with per-AI validation. Accepts human "(01)...(17)..." or raw FNC1 form.

Decode a GS1 element string (POST body { data }).

Validate an IMO ship identification number check digit.

Compute the GS1 check digit for a code body missing it.

Validate an ISO 6346 shipping container number (owner, category, serial, check digit).

Validate an SSCC-18 logistics-unit serial shipping container code.

Related concepts for a word or short phrase, from a self-derived semantic model (no transformer). Measured class-separation AUC 0.846. Unknown words are not charged.