the402 x402 endpoint directory

Pre-flight an x402 payment: decode the endpoint's challenge, report the cost on every rail (Base and Solana) and the c

Decode a Base transaction's calldata into a human-readable function call and arguments — ERC-20 transfer/approve and t

Bulk domain name availability lookup via live WHOIS: check many domains across many TLDs in one call and get a per-dom

Text-to-speech with speed (0.7x-2.0x) and quality-step (1-100) control, 1 of 10 standard voices across 31 languages, u

Validate an email address and check whether an email domain can receive mail. Verifies email syntax and performs a liv

Get liquidation risk levels for DeFi lending protocols

International phone number validation and normalization (libphonenumber): validity, country, E.164, national/internati

Convert an amount between currencies and get the exchange rate. Converts between 30+ currencies (USD, EUR, GBP, JPY an

ERC-20 token balance for any wallet — USDC, USDT, DAI, or any token contract — via balanceOf eth_call, with decimals a

Scores how similar two values are on a 0-100 scale for fuzzy matching and dedup confidence. Compares two values of a g

Returns recent cryptocurrency headline metadata and sentiment. Same GDELT-backed handler as crypto-news, with a GNews

QR code generation returning clean scalable SVG: any text/URL up to 1800 chars, selectable error-correction level (L/M

Generate deterministic fake test rows from a field->type spec plus a seed (names, emails, phones, addresses, dates, in

High-speed semantic vector cache for multi-agent swarms. Redis-backed similarity lookup with in-memory fallback before

Convert XML to JSON (attributes prefixed with @, text as #text, repeated tags become arrays) or JSON back to XML. Give

Realized PnL, ROI %, and break-even for a position from entry, exit, size, side, leverage and taker/maker fee rate.

Remove duplicate rows from CSV text by all columns or a subset of key columns; returns cleaned CSV plus a report of ho

Impermanent loss % and hold-vs-LP value for a 50/50 pool from the price ratio (new/old) of the volatile asset; nets op

One call for mean/median/mode, stddev/variance, quartiles/percentiles, z-scores, IQR and z-score outlier flags; option

Liquidity, leverage, profitability and efficiency ratios (current, quick, debt-to-equity, ROE, ROA, gross/net margin,

Build a valid RFC 5545 VCALENDAR from a list of events (or a CSV of events). Supports all-day and timed events, RRULE

Check a post against X/Twitter, LinkedIn, Instagram or Bluesky limits: weighted character count, hashtag/mention/link

Apply a Gaussian blur (useful for redaction backdrops) at a given radius.

Create a centered square thumbnail of an image at a given size.

Fetch a page and extract email addresses and phone numbers found in the content.

Fetch a page and return all hyperlinks (absolute), optionally filtered to external only.

Fetch and parse an RSS or Atom feed into a clean JSON list of items.

Fetch a page and extract title, description, OpenGraph/Twitter cards, canonical, and favicon.

Convert an amount between currencies at the latest ECB reference rate (Frankfurter, keyless).

Current US/European AQI and PM2.5/PM10/ozone for any lat/lon (Open-Meteo air-quality).

One call for mean/median/mode, stddev/variance, quartiles/percentiles, z-scores, IQR and z-score outlier flags; option

Add tax to a net amount or extract tax from a gross amount, using a supplied rate or an embedded table of US state (st

Liquidity, leverage, profitability and efficiency ratios (current, quick, debt-to-equity, ROE, ROA, gross/net margin,

Impermanent loss % and hold-vs-LP value for a 50/50 pool from the price ratio (new/old) of the volatile asset; nets op

Realized PnL, ROI %, and break-even for a position from entry, exit, size, side, leverage and taker/maker fee rate.

Convert XML to JSON (attributes prefixed with @, text as #text, repeated tags become arrays) or JSON back to XML. Give

Generate deterministic fake test rows from a field->type spec plus a seed (names, emails, phones, addresses, dates, in

Remove duplicate rows from CSV text by all columns or a subset of key columns; returns cleaned CSV plus a report of ho

Rotate a base64-encoded image by any angle (canvas auto-expands) and/or mirror it horizontally or vertically. Returns

Build a valid RFC 5545 VCALENDAR from a list of events (or a CSV of events). Supports all-day and timed events, RRULE

Check a post against X/Twitter, LinkedIn, Instagram or Bluesky limits: weighted character count, hashtag/mention/link

Generate a QR code (PNG base64) from text/URL/WiFi/vCard with size and error-correction control.

Apply a Gaussian blur (useful for redaction backdrops) at a given radius.

Create a centered square thumbnail of an image at a given size.

Convert an image between PNG, JPEG, WEBP, GIF, and BMP.

Resize an image (base64 or URL) to target dimensions with fit modes contain/cover/stretch.

Fetch and parse an RSS or Atom feed into a clean JSON list of items.

Fetch a page and extract email addresses and phone numbers found in the content.

Fetch a page and return all hyperlinks (absolute), optionally filtered to external only.

Fetch a page and extract title, description, OpenGraph/Twitter cards, canonical, and favicon.