Web answer

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://agent402.tools

• POST/api/defi-yields—No price listedLive yield opportunities across DeFi, filterable by chain, protocol, token symbol, stablecoin-only, minimum TVL and minimum APY: pool identity, TVL in dollars, total APY split into base and reward, 1-day, 7-day and 30-day APY change, impermanent-loss risk and exposure type. Use it to find, compare or monitor where a given asset earns the most right now. Also on x402 Bazaar
• POST/api/binary-text—No price listed
• POST/api/stats—No price listedDescriptive statistics for an array of numbers: count, sum, mean, median, mode, min, max, range, variance, stddev, and percentiles. Also on x402 Bazaar
• POST/api/irr—No price listedCompute the internal rate of return (IRR) of a cashflow stream - the discount rate at which NPV = 0. Index 0 is treated as t=0 (typically the negative initial investment); indices 1..n are inflows in subsequent periods. Solved via Newton-Raphson with bisection fallback. Requires at least one positive and one negative cashflow (otherwise IRR is undefined). Multiple sign changes in the cashflows can produce multiple IRR roots - we return the first one found. Also on x402 Bazaar
• POST/api/address-profile—No price listed
• POST/v1/audio/speech—No price listedOpenAI-compatible text-to-speech over x402 - point any OpenAI SDK's audio.speech.create() at base_url https://agent402.tools/v1 and pay $0.06 per call in USDC, no API key, no signup. Served by Voxtral Mini TTS behind a five-model failover chain (xAI Grok Voice, Kokoro, MAI-Voice-2 Flash, MAI-Voice-2), every link proven by a real paid canary - a provider outage never becomes your failure. Up to 2,000 chars in, raw mp3 (default) or pcm bytes out - the same wire shape as OpenAI's endpoint. Also on x402 Bazaar
• POST/api/isbn-validate—No price listedValidate an ISBN-10 or ISBN-13 checksum (hyphens/spaces ignored) and report which format it is. Also on x402 Bazaar
• POST/api/checksum—No price listedCompute 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. Also on x402 Bazaar
• POST/api/skill/fx-monitor—No price listedMajor currency snapshot: EUR/USD, GBP/USD, JPY/USD rates plus the full FX dashboard in one call. FX monitor skill pack: one x402 payment runs 3 underlying tools (fx-rate, fx-dashboard, fx-historical); partial-success per step. Also on x402 Bazaar
• POST/api/image-crop—No price listedCrop an image to a pixel box, and/or rotate (90/180/270) and flip it - applied in that order. Send a public image URL or a base64 image. Returns the result as binary, or as a JSON data URI with dataUri:true. Deterministic. Also on x402 Bazaar
• POST/api/fc-channel—No price listedDetails for one Farcaster channel by id (e.g. base) or FIP-2 parent URL: name, description, follower and member counts, public-casting flag, creation date, lead and moderator fids, pinned cast. Use to validate a channel id before pulling its feed, or to size a community. Also on x402 Bazaar
• POST/api/crypto-market-pulse—No price listedThe whole crypto perp market in one call: advancers versus decliners, mean, median and volume-weighted 24h change, total open interest and volume, top contracts by volume, the day's gainers and losers, funding extremes and BTC and ETH at a glance. Use it when an agent needs a market snapshot before deciding what to look at next. Also on x402 Bazaar
• POST/api/route/execute-pro—No price listed
• POST/api/fc-cast-search—No price listedSearch Farcaster casts by keyword (literal, semantic or hybrid match), newest first, optionally filtered to one author or channel. Returns compact casts: hash, author (fid, username, follower count), text, timestamp, channel, reactions, reply count, embed URLs. Use for mention monitoring, sentiment sampling, or finding discussion of a token, product or topic. Also on x402 Bazaar
• POST/api/black-scholes—No price listedPrice 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 1.00 change in rate. Deterministic - matches standard references to the cent. Also on x402 Bazaar
• GET/api/rwa-list—No price listedEvery real-world asset with a tokenized onchain version in the coin index: stocks, ETFs and commodities, with id, symbol, name and type. Filter by type or a name/symbol substring; ids feed rwa-markets and rwa-asset. Counts by type ride along. Cached in-process for 10 minutes. Data provided by CoinGecko. Also on x402 Bazaar
• POST/api/relative-time—No price listedFormat a timestamp as a human relative phrase ("3 hours ago", "in 2 days") versus now or a reference time. Also on x402 Bazaar
• POST/api/skill/contract-audit—No price listedTriage a smart contract before an agent interacts with it: verified Solidity source, heuristic vulnerability scan, known-address check, function-selector resolution, and a read-only dry-run of the exact call you plan to make. Contract audit skill pack: one x402 payment runs 5 underlying tools (contract-source, solidity-scan, selector-lookup, address-label, tx-simulate); partial-success per step. Also on x402 Bazaar
• GET/api/gas-estimate—No price listedCurrent gas price on Base, Polygon, Arbitrum, Optimism, Ethereum, Monad, Celo, Avalanche, Sei, or Robinhood Chain - for an agent budgeting a transaction: returns network, gasPriceGwei and gasPriceWei (decimal strings) from the chain's own eth_gasPrice, the node's suggested all-in price per gas unit. Multiply by the gas a transaction uses (21000 for a plain transfer) for its fee. Read-only. Also on x402 Bazaar
• GET/api/memory/log—No price listedTamper-evident history of changes to a namespace - a hash-chained audit log the server attests to (provenance an agent can't forge for itself). Entries are kept for a bounded window (see retention in the answer), and an entry naming a key or document that was later deleted is redacted while still linking the chain. Also on x402 Bazaar
• POST/api/json-flatten—No price listedFlatten nested JSON to dot-path keys, or unflatten dot-path keys back to nested JSON. mode: flatten (default) | unflatten. Also on x402 Bazaar
• POST/api/nft-holdings—No price listedReturn the NFTs owned by a wallet address on a given network. Each row carries the collection name, contract address, token ID, image URL (where available), and ERC-721 vs ERC-1155 standard. Up to 100 per call - paginate with `pageKey` from the previous response. Also on x402 Bazaar
• POST/api/receipts—No price listedYour own settled calls in the shape a finance system posts: one row per payment with what was bought, the amount settled, the quoted ceiling where one applied, and the evidence - settlement transaction, sha256 of the bytes delivered, and the on-chain attestation id where one exists. Keyed to the wallet that pays for the call, so nobody can read another wallet's payables; no account, no export request, no support ticket. Requires an EIP-3009 payment (USDC on Base, Polygon, or Arbitrum). Also on x402 Bazaar
• POST/api/openapi-required-params—No price listedFor one operation, return the minimum set of inputs an agent must provide to make a successful call. Locate the op by `operationId` (preferred) or by `method`+`path`. Output is a single flat array tagged by `in`: `path` (always required), `query` / `header` / `cookie` (only when `required: true`), and `body.field` entries naming the top-level required fields of a required JSON request body. Also on x402 Bazaar
• GET/api/sanctions/name—No price listedScreen a person or company name against the OFAC SDN list. Returns exact and substring matches with the SDN entry id and type, so every hit can be checked against the published list itself. Matching is exact, substring, or all-tokens (every word of your query appears as a whole word in the entry, in any order - so 'Vladimir Putin' finds 'PUTIN, Vladimir Vladimirovich'). Also on x402 Bazaar

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