Base Token Info: name, symbol, decimals, total supply and contract check for any ERC-20 on Base mainnet. $0.002 per call.

Brazil boleto decoder and validator: digitable line (47/48) or barcode (44). Bank, amount, due date (Febraban factor reset of 2025 handled) and check digits; utility/tax (arrecadacao) slips included.

Morningstar quote page data for a US stock, ETF or mutual fund: name, ticker, Morningstar star rating, key statistics shown free on the page (stocks: previous close, day and 52-week range, bid/ask, market cap, P/E, P/S, dividend yield, sector, industry, style box, employees), top-10 holdings with weight, market value and sector plus portfolio date (ETFs/funds), and the analyst report headline. Subscriber-only values are omitted.

Payment Header Check API: reads an x402 PAYMENT-SIGNATURE header before you send it - base64/UTF-8/JSON, version, authorization fields, clock window, who signed (lane a or b) and, with the seller PAYMENT-REQUIRED, payTo/amount/network/asset. Nothing is sent anywhere. $0.005 USDC per check. POST JSON {payment_signature, payment_required?}; free example at https://api.aiskills402.com/v1/run/payment-header-check/example

Read-only JSON-RPC pass-through for 20+ EVM chains (ethereum, base, arbitrum, optimism, polygon, bsc, avalanche, gnosis, linea, scroll, zksync, mantle, blast, celo, fantom, sonic, unichain, opbnb, zora, mode, metis, cronos). Single or batch calls (up to 10). Write methods refused.

Check an AI agent's track record: signed verification history, pass/fail counts, recency-weighted score. $0.01 per lookup when there is a score; a lookup for an AI agent with no history is answered free, signed. USDC via x402 v2 (Base/Solana).

Analyses up to 50 customer reviews with AI: sentiment, star-rating match, complaint and praise themes, urgency, and optionally a ready-to-post owner reply each, plus a business report with top issues. $0.002 per review, $0.005 per reply drafted, $0.03 per business report (output reviews_only skips it). Runs nerolabs/review-analyzer.

HVAC duct sizing calculator: any two of duct size (round or rectangular), airflow, velocity and friction rate. Round and rectangular equivalents, nearest standard sizes, friction loss per 100 ft (Darcy-Weisbach, Colebrook), velocity pressure, design checks. Equal-friction sizing, fixed-depth ducts, IP or SI. Shows every step with the numbers. $0.002 USDC per call.

Cheapest real end-to-end test of your pay-per-call (HTTP 402) client: pay US$0.002, get back what was paid (payer, amount, network, timestamp) and the text you sent; the settlement receipt is in the PAYMENT-RESPONSE header. A free trial call returns paid_usd 0. Use it to check a wallet, a client library or a facilitator before buying something bigger.

Videos on one YouTube hashtag page: video id, title, channel, view count text (exact for most videos), age text, duration and link, as shown on the first page (about 10-12 videos). No comments and no full history; YouTube's page layout can change.

Get Address Historical Balances Data

On-chain Forensics API for AI agents: token verdict cards and settle-safe pre-trade screens ($0.02), ERC-20 burn/mint and wallet forensics ($0.05, Base/Ethereum/XRPL), and $0.25 due-diligence memos. Bare URL = $0.02 directory tier; append ?endpoint=<name> to call a data endpoint

HVAC coil load calculator: from airflow and entering/leaving air (any two properties each), the sensible, latent and total load, tons, SHR and condensate; or one state plus loads to solve the other. Outdoor/return air mixing and outdoor air % back-calculation. ASHRAE psychrometrics, elevation, IP or SI. Shows every step with the numbers. $0.002 USDC per call.

Lead summary of the Wikipedia article that best matches a topic, in any language edition: title, short description, summary paragraph, image, coordinates, Wikidata id and link. Use for quick factual background on a person, place, company or concept.

Use when you need a current crypto price: live US-dollar prices for up to 25 crypto assets in one call, by ticker (BTC, SOL…), price id (e.g. coingecko:bitcoin) or chain:address (e.g. base:0x…), with symbol, confidence and timestamp.

Retrieve address PnL data

Screen a name against the US OFAC SDN and Consolidated lists: potential matches with list, programs, name score and reasons; optional type, date of birth and country re-rank. Fuzzy, folds accents, any script. Not a determination: an empty candidates list is a paid 200 and certifies nothing. Not UN, EU or UK.

Texas Medical Board license verification and disciplinary status from TMB open data (data.texas.gov, daily): physicians, PAs, acupuncturists and other TMB licenses. Look up a license number or search by name, city, specialty or type; returns license type, degree, specialties, issue and expiry dates, registration and disciplinary status, board action, practice address and license status.

Which tracked Base opportunities depend on an entity (protocol, stablecoin, oracle, curator), with their total TVL. Useful for sizing the impact of an exploit, depeg or oracle failure. Entity ids appear in dependency graphs, for example protocol:morpho-blue. Unknown ids answer 404 and invalid arguments 400 before any payment; 503 while data refreshes; charged only for a 200.

Risk profile of one protocol on Base: age, TVL history, audits, exploit history, governance (admin, timelock, multisig, upgradeability, pause) and the risk of its opportunities. Useful for due diligence on a protocol. Unknown ids answer 404 and invalid arguments 400 before any payment; 503 while data refreshes; charged only for a 200.