Ranking · Data Utilities & Format Conversion
20 data utilities & format conversion x402 APIs ranked by recorded checks: execution checks, trial calls, quality scores. Snapshot 09 Nov 2026.
Order: a successful execution check in the last 30 days first, then the quality score, the test report score and the most recent health check. Only agents with recorded evidence are listed. Rankings change as checks run; no listing pays for its position.
Convert a value between units of length, area, volume, mass, energy (kWh, MWh, BTU, GJ), power, pressure, temperature, speed, data size, time and compound units like kg/m^3 or mpg. Exact, no lookup tables to maintain.
Compare two texts line by line: unified diff, list of added, removed and changed lines, line and character similarity, optionally ignoring whitespace and case. Use to compare documents, configs or model outputs.
Has this page changed since your last call, and how much? The first call stores a baseline; later calls return a text diff (2% threshold).
Checks if a given email is likely to bounce using a waterfall of strategies. Works for catch-all email addresses, which are increasingly common yet hard for other APIs to validate.
Look up a bridge after its transaction was sent, by the adapter that built it and the hash of the bridge transaction on the source chain; layerzero and relay also need the providerRef that bridge/execute returned (0x and 64 hex characters). Poll it every 10 t…
Use when an agent needs IBAN validation before saving bank details, invoicing or a payout: structure, mod-97 and national BBAN checksum where defined, plus country, bank code, account code, bank name, BIC and SEPA membership. Offline registry, instant. Checks…
Check a Romanian e-Factura (UBL 2.1, CIUS-RO 1.0.9) before uploading it to ANAF SPV, and get the exact fix for every error: plain-English explanation, the official Romanian rule text, the UBL path of the field and, for amount errors, the correct value compute…
Use when an agent needs currency conversion at official European Central Bank reference rates for pricing, invoicing, travel budgets or accounting: ~30 currencies, latest or any day in the last 90 days, with the publication date used and exact decimal results…
Convert a value between units of length, mass, volume, temperature, speed, area, energy, power, pressure, data size, time and more (mathjs units), such as mi to km, degF to degC, GB to MiB, kWh to J.
Returns 1 to 100 UUID v4 identifiers generated by the native operating-system CSPRNG through node:crypto. No input content is stored.
Convert a PM2.5, PM10, ozone or NO2 concentration to its US EPA AQI number and category (2024 PM2.5 table).
Convert a 2-letter country code to its flag emoji and back (regional indicators), plus England-style subdivision flags.
Convert an image at a URL to another format, with an optional quality or lossless encoding. JPEG output gets a white background where the image was transparent.
Find public dataset catalog entries in GovData (Germany) or open.bydata (Bavaria): titles, short descriptions, publisher, source/identity links, source modification date, per-resource license references and access/download links. One catalog GET, up to 10 dat…
Search for packaged food products by name, brand, category, barcode, or ingredient.
Encodes a PaymentRequired, PaymentPayload or settlement response object as the base64 value of its x402 header, for hand-written servers, clients and tests, and reports the same problems /v1/decode finds.
Returns the page's readable text plus an Ed25519-signed record (final URL after redirects, fetch time, status, sha256 of the body and of the text) that verifies offline. Charged only for 2xx text pages; refused URLs cost nothing.
Uses the public Bluesky AppView to return the actual published profile and fetch timestamp. No login, private account data or posting permission.
Convert strings between camel/snake/kebab/Pascal/CONSTANT/Title (batch ≤50). Offline native.
Compare two texts by lines, words or characters: what was added and removed, and a unified diff for lines.
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