Agent-economy census snapshot: how many known agent/MCP endpoints are alive, dead or unknown right now.

Registrar, creation and expiry dates, status codes and name servers of a domain from the registry's RDAP record, and whether the name looks available.

Apply a Unicode normalisation form (NFC, NFD, NFKC or NFKD) to a string. Reports whether the text changed and its length in UTF-16 code units and code points.

Title, description, headings and up to 20,000 characters of clean readable text from any public URL. Built for LLM context. Private and local addresses are refused.

Decode a base64 byte buffer from one character set and re-encode it into another (utf-8, utf-16le, utf-16be, latin1, ascii). Characters that the target set cannot represent, or bytes invalid for the source set, are clean 400s.

Guess the character set of a base64-encoded byte buffer: sniffs a byte-order mark, then falls back to ASCII / UTF-8 validation and a UTF-16 NUL-pattern heuristic. Returns a best-effort charset with a confidence label — a low-confidence guess is still a successful 200.

Convert a public PNG/JPEG/WebP/GIF or base64 image into an editable, palette-quantized pixel canvas. Full agent guide: https://pixelart.withzero.xyz/llms.txt

List every physical constant in the dataset, or only those in a given category (universal, adopted, electromagnetic, atomic, physico-chemical). Returns the constants, the total count and the set of available categories.

Pre-flight check before a swap or transfer: ERC-20 allowance, balance, decimals and symbol in one call, read live from the chain at the latest block. Pass an amount and get a straight would_succeed verdict with the blocking reason and the action needed. Base, Ethereum, Arbitrum, Optimism, Polygon. A missing approval burns the gas of a failed transaction - this call costs a fraction of that.

Break a string into its Unicode code points, each with its U+ notation, decimal value and UTF-8 / UTF-16 byte layout, plus total byte lengths.

Time-zone conversion on the IANA database: convert a time between zones with offsets, abbreviations and DST flags, describe zones at an instant, or compute the shared business-hours window across several zones for meeting scheduling.

The same as paid-ping, plus how long verification and settlement actually took, measured server-side. For choosing your own client timeouts from evidence rather than guessing. Settlement on Base typically completes in one to three seconds, so a timeout under five seconds produces false failures on a healthy network.

TraceFast knowledge graph: every relation interval an address has held, oldest first — as the subject (`direction=subject`: what it pointed at, default) or as the object (`direction=object`: who pointed at it). Path address: The address, `0x`-prefixed, 40 hex characters, any case. Query direction: `subject` (default) or `object`; limit: 1..=500, default 100. Docs: https://docs.tracefast.xyz/api/address-relation-history.md

Read the next nonce for an address, live from Base mainnet, for a fraction of a cent. No API key, no account — a wallet is the only requirement, and you are charged only if the read succeeds. Plain unsigned data; the attested version of chain reads is /v1/oracle/onchain. Answers are read at the moment of the call and stamped with the block they came from where applicable.

Safety Check (TAP Labs (made by TAP)): Token safety and security check for a token on Base or Solana, or a contract on Base, before you buy or swap. Looks for scam and rug pull warning signs: who can mint, freeze, blacklist, pause, tax or upgrade it, thin liquidity, a brand-new pool, big holders (Solana; Base tokens under 5 hours old), unverified code and scam-list matches (Base) and OFAC sanctions. Does not simulate a sale. Not a guarantee. Every finding links its source.

Serialize a JSON value into a compact MessagePack or CBOR byte stream, returned as a base64 (default), base64url or hex string, along with the byte length.

Per-player performance context around tournament matches.

Search functions or classes by meaning and by keyword. ``mode=bm25`` ranks by lexical match, ``mode=vector`` by embedding similarity to the query text, and ``mode=hybrid`` (default) fuses both rankings with reciprocal rank fusion. Returns up to ``top_k`` matches with their repository, file path and score; the ``domain``, ``ontology_concept_uri``, ``confidence_min`` and ``has_tests`` filters apply to Function results only.

Reduce a fraction to lowest terms and describe it: numerator/denominator (denominator normalized positive), sign, whether it is an integer, and a mixed-number form when improper. A zero denominator is a clean 400.

Compute the determinant of a square matrix via Gaussian elimination with partial pivoting. A non-square, ragged or empty matrix is a clean 400; a singular matrix simply returns 0.