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Base URLhttps://agent402.tools/api

• POST/token-allowance—No price listedHow much of an ERC-20 token a spender contract is approved to move from an owner wallet - the approval check an agent runs before a swap, a bridge, or an x402 transferWithAuthorization flow. Returns the allowance as an exact decimal string scaled by the token's decimals, the raw uint256, and an `unlimited` flag for max-uint style approvals. Also on x402 Bazaar
• POST/csv-lint—No price listedValidate CSV structure: consistent column counts across rows, properly closed quotes, delimiter detection. Returns row/column counts and any structural errors. Pure CPU. Also on x402 Bazaar
• POST/skill/identity-mint—No price listed
• POST/token-price—No price listedReturn the current USD spot price for an ERC-20 token, identified by its contract address and network. Sourced from an aggregated market price feed. Use this for portfolio-value calculations or to denominate a balance in fiat without depending on a separate market-data API. Also on x402 Bazaar
• POST/skill/xml-json—No price listed
• POST/skill/world-data—No price listedGDP and population for a country - two key World Bank indicators in one call. World Bank country data skill pack: one x402 payment runs 3 underlying tools (world-bank-indicator, world-bank-indicator, world-bank-indicator); partial-success per step. Also on x402 Bazaar
• POST/perp-basis—No price listedBasis for one perpetual: mark versus oracle premium in percent and basis points, impact premium, current funding and the predicted next funding per venue. Use it when an agent is evaluating a cash-and-carry, comparing funding across venues or deciding whether a perp is trading rich or cheap to spot. Also on x402 Bazaar
• POST/defi-protocols—No price listedDeFi protocols ranked by total value locked, filterable by category, chain or name, each with rank, chains, TVL, 1h, 1d and 7d change, market cap and the market cap to TVL ratio. Use it when an agent needs the league table of protocols or wants to find the largest lending, DEX or staking venues on a chain. Also on x402 Bazaar
• POST/skill/document-brief—No price listedMetadata, an AI-written summary, and a preview of the opening pages of a PDF - understand what a document says without reading the whole thing. The catalog's first AI-summarization pack, complementary to document-intel's deterministic format extraction (no AI, no summarization there). Document brief skill pack: one x402 payment runs 3 underlying tools (pdf-info, pdf-summarize, pdf-extract-pages); partial-success per step. Also on x402 Bazaar
• POST/gas-snapshot—No price listedLive gas price snapshot for a chain - slow / standard / fast tiers in gwei, plus the latest base fee. Sampled from eth_feeHistory (last 4 blocks, 25th/50th/90th percentile priority fees). Use to estimate before broadcasting a transaction from another tool. Also on x402 Bazaar
• POST/querystring—No price listedParse a URL query string into an object, or build one from an object. mode: parse (default) | build. Also on x402 Bazaar
• POST/openapi-validate-payload—No price listedValidate a JSON payload against the request or response schema for one operation in an OpenAPI 3.x or Swagger 2.x spec. Locate the operation by operationId or method+path; choose `part: "request"` or `part: "response"` (status defaults to the first 2xx). Deterministic subset of JSON Schema: type, required, enum, properties, items, additionalProperties:false, oneOf/anyOf/allOf, $ref-detection (not dereferenced). Also on x402 Bazaar
• POST/sitemap—No price listedFetch and parse a sitemap.xml (or sitemap index): returns up to 500 URLs with lastmod, or the child sitemaps of an index. Also on x402 Bazaar
• POST/hmac—No price listedHMAC signature of a message with a shared key. Algorithms: sha256 (default), sha512, sha1. Returns hex and base64. Also on x402 Bazaar
• POST/json-query—No price listedExtract a value from JSON by dot/bracket path, e.g. "items[2].name". Also on x402 Bazaar
• POST/epoch-convert—No price listedConvert between Unix epoch timestamps and ISO 8601 date strings in both directions. Provide either an epoch (seconds or milliseconds) or an ISO date string. Returns both representations plus UTC and date components. Also on x402 Bazaar
• POST/crypto-options-chain—No price listedThe options chain for a currency and expiry sorted by strike: bid, ask, mark, mark implied volatility, open interest, 24h volume and the underlying, plus the list of available expiries. Use it when an agent is pricing a strategy, finding liquid strikes or reading the volatility smile for a specific expiry. Also on x402 Bazaar
• POST/image-thumbnail—No price listedMake a square thumbnail of an image - scales and center-crops to NxN (default 128). Send a base64 image and optional size. Returns the thumbnail. Deterministic, no network. Also on x402 Bazaar
• POST/x-user-tweets—No price listedFetch an X (Twitter) account's most recent tweets by user id or username (username is resolved first). Options to exclude retweets and replies, page with pagination_token, or fetch only tweets newer than since_id. Each tweet carries text, created time, language and engagement metrics. Also on x402 Bazaar
• POST/json-format—No price listedValidate, pretty-print (any indentation, 0-8 spaces), or minify JSON, optionally with object keys sorted. canonical: true returns the RFC 8785 (JCS) canonical form - keys sorted, no whitespace, ECMAScript number and string serialization - plus its SHA-256, for hashing and signing. Numbers are read as IEEE-754 doubles and a duplicate key keeps its last value. Returns parse errors with position when invalid. Also on x402 Bazaar
• POST/html-to-markdown—No price listedConvert an HTML fragment or document you already have into clean markdown. (To fetch + convert a live URL, use /api/extract.) Also on x402 Bazaar
• POST/skill/search-and-cite—No price listedBundled execution of the Answer-a-question with sources workflow - The 'research a question, return an answer with citations' workflow. Brave answer for the AI-synthesized take with citations, Brave web for the canonical SERP, Brave news for time-sensitive context, then a deterministic web-fetch + extract pass on the top citations to verify the answer hasn't hallucinated. Five tools, one cited paragraph, every claim traced back to a fetched URL. Also on x402 Bazaar
• POST/combinatorics—No price listed
• POST/site-map—No price listedDiscover a website's URLs in one call: reads robots.txt, its declared sitemap(s) (sitemap indexes and gzipped sitemaps included, /sitemap.xml as the fallback) and the start page's internal links, then returns a same-host, normalized, deduplicated list (up to 500) with an optional substring filter. Hard budgets: at most 6 fetches, 15 seconds, 5 MB. Use it to pick which pages to crawl or extract next. Also on x402 Bazaar
• GET/crypto-trending—No price listedTrending coins in the last 24 hours, ranked by user search activity on the market-data site (currently ~15 results). Includes coin id, symbol, market cap rank, current price (BTC-denominated), and score. Useful signal for detecting narrative shifts before they hit price charts. Data provided by CoinGecko. Also on x402 Bazaar

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