Discover and fetch a site's A2A (Agent2Agent protocol) Agent Card — tries /.well-known/agent-card.json then /.well-known/agent.json (or fetches a direct .json URL as-is) — and validate it against the spec v0.3 structural core. Returns the card, er...

Add (or subtract) a duration to a date. duration like "2d", "-3h", "1w 2d", "90m". Returns the resulting UTC ISO timestamp.

Label a known EVM address from a curated, committed dataset: major stablecoin + token contracts (USDC on every chain we settle on, USDT, DAI, WETH, WBTC), DEX routers (Uniswap, 1inch, 0x), canonical L1↔L2 bridges, large exchange hot/cold wallets, ...

Explorer-grade profile of any address on any Blockscout-hosted chain: native balance, contract vs EOA, verification status, token/NFT flags, ENS, public tags — bought per call from Blockscout's Pro API over x402, no API key anywhere in the chain. ...

Compute a precise age (years, months, days) from a birth date to today (or a given date), plus total days.

Build the full per-period amortization schedule for a fully-amortizing loan. Each row reports the period number, payment, the principal vs. interest split for that payment, and the remaining balance after that payment. Use this when the user wants...

Present and future value of a level annuity (equal periodic payments). Supports an ordinary annuity (payments at period end) and an annuity-due (payments at period start).

AI-generated answer to a natural-language question, grounded in live web search results with source citations. Returns clean prose plus a structured citations array (URL, snippet, favicon) - backed by an independent search index, not the model's t...

Look up a URL in the Internet Archive's Wayback Machine: returns the archived snapshot closest to an optional timestamp (default: most recent), with the snapshot URL, capture time, and archived HTTP status. Useful for citations, dead-link recovery...

Look up the Autonomous System (ASN), prefix, country, registry, and allocation date for an IPv4 address — or for a hostname (which is resolved first). Uses Team Cymru's free DNS-based IP→ASN mapping; no HTTPS upstream, no auth, no rate-limit heada...

Extract/convert the audio track of any media URL (mp4, mov, wav, m4a, ogg…) to MP3 — the "mp4 to mp3" conversion, deterministic ffmpeg, no AI. Body: {"url":"https://…/video.mp4","bitrate":"192k"?}. Returns the MP3 as base64.

Loudness-normalize any audio/video URL to a target LUFS with ffmpeg's loudnorm (EBU R128) and return MP3 — consistent levels for podcasts, clips, and TTS output. Body: {"url":"https://…/audio.wav","targetLufs":-16?}.

Is B20 live on Base mainnet? Queries the Activation Registry precompile for base.b20_asset and base.b20_stablecoin (or a custom feature id). Honest pre-launch too: reports not-activated until the registry flips. ?feature=base.b20_asset (optional)

Pure-CPU helper: turn a B20 feature string (e.g. base.b20_asset) into its bytes32 feature id and ready-to-send isActivated(bytes32) calldata for the Activation Registry. No network egress.

Payment memos attached to B20 transfers: pairs each Memo(address,bytes32) log with its Transfer at the previous log index (same tx, same token). Give a tx hash for one transaction, or scan a block window. Returns memoHex always and memoText when p...

Recently deployed B20 tokens on Base: scans the factory's B20Created logs over a block window, locates each new token by its 0xB200 address prefix, and enriches it with live name/symbol/decimals eth_calls. ?blocks=50000&limit=25

ERC-20 metadata plus B20 signals for any Base address: name, symbol, decimals, total supply, best-effort paused/cap, bytecode size, and whether the address carries the factory-issued 0xB200 prefix. Works on plain ERC-20s too (isB20 comes back fals...

Boolean verdict with reasons: is this address a real factory-issued B20 on Base? Checks the 0xB200 address prefix, ERC-20 readability, and whether the B20 feature set is activated on the registry. ?address=0x…

Decode a barcode or QR code from an image. Send a base64 PNG or JPEG (or a data: URL); returns the decoded text and the symbology. Reads QR, DataMatrix, and 1D barcodes (EAN/UPC/Code39/Code128/ITF/Codabar). Deterministic, no network, no model.

Look up a product by its UPC/EAN barcode number via Open Food Facts (open data): name, brand, category, quantity, and nutrition grade. Pairs with /api/barcode-decode (image → number → product). ?code=737628064502

Convert an integer between number bases (radix 2-36), e.g. binary↔hex↔decimal. Arbitrary size via BigInt.

Auto-detect the encoding format of a string: base64, base32, hex, binary, decimal, or plain text. Returns confidence scores and decoded preview for each candidate. Pure CPU, deterministic.

Base32 (RFC 4648) encode or decode text. mode: encode (default) or decode.

Base58 encode or decode text (Bitcoin/IPFS alphabet). mode: encode (default) or decode.

Base64 encode or decode text. mode: encode (default) or decode. Handles URL-safe base64 on decode.

What agents actually pay for on a 500+ tool x402 catalog — the paid intelligence layer over Agent402's own sales ledger, the one demand signal that never reaches the chain (settlements are on-chain; WHICH tool was bought is not). The raw merchant ...

Convert text to its binary (base-2) representation (8-bit per character, space-separated) or decode binary back to text. Deterministic, pure CPU.

Price a European option (call or put) with the Black-Scholes-Merton model, plus the greeks (delta, gamma, vega, theta, rho). Continuous dividend yield supported. Greeks are per unit: theta is per year, vega per 1.00 change in volatility, rho per 1...

Price a fixed-coupon bond from its yield to maturity: present-value the coupons plus face. Returns clean price, coupon per period, current yield, and premium/discount vs par.

Solve a bond's yield to maturity from its market price — the annual rate that present-values the coupons plus face to that price. Bracketed bisection root-find.

Convert text to Unicode Braille characters (Grade 1 / uncontracted) or decode Braille back to text. Supports letters, digits, and common punctuation. Deterministic, pure CPU.

Break-even point for a product: the units and revenue at which total revenue covers fixed plus variable costs. Also returns contribution margin and margin ratio.

Compress a string with Brotli (RFC 7932) and return it as base64. Brotli typically beats gzip by 15-25% on text — useful when bytes matter (e.g. cramming context into an LLM prompt, fitting under a transport cap). Slower than gzip; pick gzip if sp...

Decompress a base64-encoded Brotli payload. Returns the result as utf8 (text) or base64 (binary). Refuses to expand past 10MB to defend against zip bombs.

Count business days (Mon–Fri) between two dates, inclusive of the start, exclusive of the end. Optional list of holiday dates to skip.

Compound annual growth rate between a beginning and ending value over N years: (end/begin)^(1/years) - 1. Also returns total growth over the whole period.

Safely evaluate an arithmetic expression (+ - * / % ^ and parentheses). No code execution — a real parser, not eval.

Calculate the precise difference between two datetimes in years, months, days, hours, minutes, seconds, and total milliseconds. Accepts ISO 8601, Unix timestamps, or natural date strings. ?from=2024-01-15&to=2026-06-23.

Decode EVM transaction calldata into the function name and typed parameters. Supply an ABI (from /api/contract-abi) or a signature like transfer(address,uint256) for a fully offline decode; with neither, the 4-byte selector is resolved via the ope...

Mint a stateless captcha challenge to gate your OWN endpoint: returns a human prompt plus a salted sha256 answer hash you keep and verify later (sha256(salt + normalized answer) === answerHash) — no server state, no shared secret. Types: math (ari...

Validate a Cloudflare Turnstile, Google reCAPTCHA, or hCaptcha token server-side. You pass your OWN provider secret plus the token from the client; we relay to the provider's siteverify endpoint (never logged) and return the normalized verdict (su...

Validate a payment card number (Luhn checksum) and detect the brand. Numbers are not stored or logged.

Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, lower, UPPER.

Convert text between naming conventions: camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and Title Case. Auto-detects the input format by splitting on camelCase boundaries, underscores, hyphens, and spaces. Deterministic, pure CPU.

Search public Certificate Transparency logs (via crt.sh) for every cert issued to a domain. Returns the cert list plus a deduped subdomain set extracted from the SANs — the fastest way to enumerate subdomains for a security audit. Free upstream, no key required.

Analyze the character frequency distribution of a string. Returns counts by category (letters, digits, spaces, punctuation, other) and the top-N most frequent characters with counts and percentages. Deterministic, pure CPU.

Compute MD5, SHA-1, SHA-256, SHA-512, and CRC32 checksums of a string in a single call. Useful for verifying file or payload integrity across different checksum standards without needing five separate tools.

Parse an IPv4 CIDR block: network address, broadcast, first/last host, netmask, and host count. Optionally test if an IP is inside it.

Execute Python or JavaScript code in a secure, isolated cloud sandbox. Returns stdout, stderr, and the expression result. No setup needed; pay per call via x402. 30s timeout, 10k char code limit.

Execute Python or JavaScript code in a secure, isolated cloud sandbox (Pro tier). Same as /api/code-run but with 60s timeout and 50k char code limit for longer computations. Returns stdout, stderr, and the expression result.