Web answer

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Base URLhttps://agent402.tools

• POST/api/word-frequency—No price listed
• POST/api/hash—No price listedCryptographic hash of a text string - sha256 (default), sha512, sha1 or md5 - returned as hex and base64. Use it for content fingerprints, integrity checks and deterministic ids; pure computation, instant. Also on x402 Bazaar
• GET/api/geo-lookup—No price listedResolve a US latitude/longitude to its county, state and census block FIPS codes via the US Census Bureau geocoder. Use it when an agent has coordinates and needs the administrative geography (jurisdiction, county, census block) - live government data, no key. Also on x402 Bazaar
• GET/api/weather-forecast—No price listedMulti-period weather forecast for a US location from api.weather.gov (NWS, public domain). Give latitude and longitude; returns the place plus upcoming forecast periods (temp, wind, conditions). US coverage only. Also on x402 Bazaar
• POST/api/skill/content-quality—No price listed
• GET/api/chain/storage—No price listedRead one 32-byte storage slot from a contract, the raw state under whatever the source code calls it. Returns the word as hex plus three readings of the same bytes - unsigned integer, address (low 20 bytes) and boolean - because a slot is untyped on chain and only the caller knows which it meant. Useful for proxy implementation slots, paused flags and any value the ABI does not expose. EVM chains: ethereum, base, polygon, arbitrum, optimism. Also on x402 Bazaar
• POST/api/github-repo—No price listedEnrich a public GitHub repository: stars, forks, watchers, open issues, license, topics, primary language plus the full language byte mix with percentages, created/last-push timestamps, default branch, archived/fork flags, and homepage. Keyless (shared per-IP rate limit; the server optionally uses a GITHUB_TOKEN env var for a higher ceiling). Unknown repos return 404. Also on x402 Bazaar
• GET/api/weather-history—No price listedHistorical daily weather for any location and date range (up to 1 year): high/low temp, precipitation, wind, conditions. Historical archive, no key, global. Data from 1940 to 5 days ago. Also on x402 Bazaar
• POST/api/perp-markets—No price listedEvery listed perpetual futures market in one call: mark, oracle and mid price, 24-hour change, funding (hourly, 8-hour, annualized), open interest in coins and dollars, 24-hour notional volume and max leverage, sortable by volume, open interest, funding or change. Use it as the one-shot market map before drilling into a single symbol. Also on x402 Bazaar
• POST/v1/nano/responses—No price listedOpenAI Responses API over x402 - point the OpenAI SDK's responses.create() (or the OpenAI Agents SDK) at base_url https://agent402.tools/v1/nano and pay $0.003 per call in USDC, no API key, no signup. Same models, caps and price as this tier's /chat/completions route; any model here is served through the Responses wire. Also on x402 Bazaar
• GET/api/global-defi—No price listedGlobal DeFi snapshot: DeFi market cap (USD), ETH market cap, DeFi-to-ETH ratio, 24h DeFi trading volume, DeFi dominance % of the whole crypto market, and the top DeFi coin with its share of DeFi. The DeFi companion of crypto-global (whole-market caps and BTC/ETH dominance) and of defi-tvl (locked value, a different measure). Cached in-process for 5 minutes. Data provided by CoinGecko. Also on x402 Bazaar
• POST/v1/domain-audit/pro—No price listed
• POST/api/skill/text-analyze—No price listedFull text analysis - word/sentence stats, keyword extraction, and token count in one pass. Text analysis skill pack: one x402 payment runs 3 underlying tools (text-stats, keywords, token-count); partial-success per step. Also on x402 Bazaar
• POST/v1/responses—No price listedOpenAI Responses API over x402 - point the OpenAI SDK's responses.create() (or the OpenAI Agents SDK) at base_url https://agent402.tools/v1 and pay $0.02 per call in USDC, no API key, no signup. Same models, caps and price as this tier's /chat/completions route; any model here is served through the Responses wire. Also on x402 Bazaar
• POST/api/html-select—No price listedRun a CSS selector against an HTML string and return the matches (text, attrs, and optionally outerHTML for each). The deterministic alternative to regex when you already have the HTML and know the selector - pairs with /api/render or any page you've fetched yourself. Also on x402 Bazaar
• POST/api/embed—No price listedGenerate a text embedding vector using OpenAI text-embedding-3-small (1536 dimensions). Ideal for semantic search, RAG, and clustering. No API key needed; pay per call via x402. Text capped at 32k chars. Also on x402 Bazaar
• POST/api/text-diff—No price listedLine-by-line diff of two texts (LCS). Returns unified-style ops and change counts. Up to 2000 lines per side. Also on x402 Bazaar
• GET/api/x402-audit—No price listedGrade any x402 seller's payment-security posture from the outside - a read-only black-box check mapped to the 'Five Attacks on x402' failure modes. Probes the URL's 402 challenge (never pays) and scores TLS transport, gated-response cache hygiene (Attack III / cache leakage), error/info-leak hygiene, and payment-terms well-formedness, then returns a letter grade with per-check findings and an honest note on what only insider/active testing can confirm. Also on x402 Bazaar
• POST/api/memory/remember—No price listedStore a piece of text for later similarity recall - a per-wallet semantic index an agent cannot host in-session. Returns an id. Prefer memory-write for structured state you will look up by exact key; this pair is for fuzzy, meaning-based retrieval. Pair with /api/memory/recall to retrieve by meaning, not exact key. Also on x402 Bazaar
• POST/api/sol-token-holders—No price listedTop-holder concentration for a Solana token mint: the 20 largest holders with token account, owner wallet, balance, percent of supply, insider flag and a pool/locker label when the account is a known AMM vault or locker, plus top-1/5/10/20 share, top-10 share excluding labelled pool accounts, insider count, total holder count and supply. Use it to tell a whale-held launch from one whose largest holder is the liquidity pool. Also on x402 Bazaar
• POST/api/constant-compare—No price listed
• POST/api/html-entities—No price listedEncode text to HTML entities or decode them back. mode: encode (default) or decode. Also on x402 Bazaar
• GET/api/search-images—No price listedLive image search: ranked image results (title, source page, image URL, thumbnail URL, dimensions) from an independent search index as clean JSON. Strict safe-search is on by default. Also on x402 Bazaar
• POST/v1/pro/gemini—No price listedGoogle's native generateContent wire on the pro tier. Send Gemini's own request shape (contents, systemInstruction, generationConfig, function declarations) and get Gemini's own response shape (candidates, usageMetadata) back. Point a Google GenAI SDK at this gateway and pay per request with USDC, no account. Also answers the Google-shaped path /v1beta/models/<model>:generateContent. Also on x402 Bazaar
• GET/api/coin-categories—No price listedCoin categories (Layer 1, Meme, AI, DeFi, Stablecoins, RWA, ...) ranked by market cap, with 24h market cap change %, 24h volume and the top-3 coins per category. Order by market_cap_desc (default), market_cap_asc, market_cap_change_24h_desc/asc, name_asc/desc; optional `query` substring filter on category name/id; limit 1-100 (default 25). The sector-rotation view: which narratives are gaining or bleeding today. Cached in-process for 5 minutes. Data provided by CoinGecko. Also on x402 Bazaar

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