What a page shows while an image loads: its BlurHash, a tiny blurred WebP preview as a data URL, its average color and its dimensions.

Draw a line of text over an image at a corner, an edge or the center, with a size relative to the image width, a color and an opacity.

Use when an agent, x402 test or CI job needs Base Sepolia gas now: one x402 call, no faucet login or mainnet history. Input: to (recipient address); sends 0.1 ETH (1 ETH: /v1/testnet/base-sepolia-eth/1). Output: JSON txHash (confirmed before settling), explorerUrl, amountEth, from, to. Daily limits (UTC): 5 ETH per address (both sizes), 20 overall; checked before payment. Test ETH has no monetary value. Example: ?to=0x000000000000000000000000000000000000dEaD

Compare two texts by lines, words or characters: what was added and removed, and a unified diff for lines.

Decode a JSON Web Token's header and claims, and say when it was issued, when it expires, whether it has expired and in how many seconds it will. The signature is not verified.

Validate a JSON value against a JSON Schema (draft-07 and 2019-09 keywords, formats such as email, uri, date-time) and list every error with its path. Patterns run on RE2, so a schema cannot stall the check.

Format, dimensions, megapixels, bytes, channels, transparency, color space, bit depth, DPI, orientation, animation and pages, ICC profile, and EXIF camera details (make, model, date taken, exposure, aperture, ISO, focal length, GPS position) of an image at a URL.

Call this before paying any agent: Should I Pay? Binary decision (PAY/CAUTION/SKIP) with confidence and expected USDC loss before sending money to an unknown agent. Is this agent trustworthy? Every response includes a shareable verdict page and card image. GET or POST with JSON body. No account, no API key

The dominant colors of an image with their share of it, and its average color, as hex and RGB, for palettes, theming and search.

Make an image smaller in bytes: re-encode it (mozjpeg for JPEG, palette quantization for PNG) with metadata removed, optionally scaled down to a maximum width or converted, and report how much was saved.

Run a regular expression on a text: every match with its position and capture groups (named too), and the text with a replacement applied. RE2 syntax, which runs in linear time (no lookaround or backreferences).

Audit your x402 endpoint before buyers hit it. Checks that it answers 402 on the right method, that the payment options can actually be signed (EIP-712 domain of the token matches extra.name and extra.version), that the resource URL is the https URL buyers call, and that /openapi.json and /.well-known/x402 match. Includes the CDP validate verdict, whether the CDP Bazaar lists the endpoint, its payers in 30 days, and its search rank and competitors' prices for up to 3 queries.

MD5, SHA-1, SHA-256, SHA-512, SHA3-256 and Keccak-256 (Ethereum) of a text, or of bytes given as hex or base64, as hex and base64.

Use when an agent needs a token's USD price without a third-party price feed. Input: tokens (up to 10, base:0x… or sol:<mint>). Output: per token priceUsd, confidence, the pool used (Uniswap v3 / Aerodrome on Base, Orca Whirlpool on Solana; fee tier, depth in USD), path (direct USDC or via WETH/SOL), warnings; no price below $1,000 depth. Spot, not TWAP. Example: ?tokens=base:0x940181a94A35A4569E4529A3CDfB74e38FD98631

Historical annual company financials, excluding stock prices. Free field list: GET /api/v1

Perfil de contraparte en Base: tipo (EOA, EOA con EIP-7702 o contrato), nonce, saldos de ETH y USDC, y flujo de USDC de los últimos 7 días (recibido, enviado, contrapartes y pagadores distintos). Hechos con número de bloque, sin puntajes. Útil antes de pagarle a un payTo desconocido.

Whether a USDC transferWithAuthorization nonce of an authorizer has already been used on Base, which is how an x402 buyer tells a settled payment from one that never landed, plus the authorizer's USDC balance.

AI token verdict: GoPlus honeypot/tax/owner screen + DexScreener liquidity, then an LLM writes the SAFE/RISKY/SCAM verdict. Memecoin rugcheck. $0.01/call, USDC on Base. Not financial advice.

Split long text into pieces for RAG retrieval. Strategies: 'sentence' packs whole sentences into a size budget and never splits mid-sentence; 'paragraph' prefers \n\n boundaries; 'fixed' is a hard char window with overlap. The highest-value endpoint for agents that build retrieval pipelines.

Checkup for x402 buyer clients. Pay once and get a field-by-field diagnosis of the payment your client signed (amount, recipient, validity window, clock offset, nonce, EIP-712 signature) and of the request that arrived, plus the facilitator's verify and settle results. Base mainnet payments get the full diagnosis; Base Sepolia payments get a preview with the status of each check only.