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Every pay-per-call x402 API we can find, ranked by what agents actually pay for. No accounts, no API keys.
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4,150 results- Nnojunk-crypto-price.mick8511.workers.devCrypto & DeFi
Current USD price, market cap, 24h volume and 24h change for up to 10 cryptocurrencies by ticker symbol (BTC, ETH, SOL, ...) or for any on-chain token by contract address and chain (ethereum, base, bsc, arbitrum, polygon, optimism, avalanche, solana). Data from CoinGecko.
Basenojunk-crypto-price.mick8511.workers.devfrom $0.0011 endpoint - NNASA Media LibraryImages, audio & video
Find Apollo mission photos and media (missions 7 to 17) in NASA's library, with mission year and photo-id prefix.
BaseSolanaPolygon+1nasa-media.x402tookit.comfrom $0.028 endpoints - BBatch Readiness ScanAI & agents
Bulk agent-readiness screening for agencies, VCs and portfolio owners: scan up to 50 URLs in one paid call ($0.02/URL, $0.10 minimum) and get a compact per-URL verdict — level 0-5, passing checks, top gaps. The single-URL scan with full evidence stays free at /api/x402/deep-scan; this buys scale and rate-limit bypass.
Basemudko.comfrom $0.107 endpoints - MMachine Learning MetricsOther services
Sentence BLEU (1-4 gram, brevity penalty, optional smoothing) and ROUGE-1, ROUGE-2, ROUGE-L F1 for text against references.
BaseSolanaPolygon+1ml-metrics.x402tookit.comfrom $0.028 endpoints - MMarkup and Text Extraction ToolsSearch & web
Extract the h1-h6 heading outline from supplied HTML and flag missing or multiple h1, skipped levels and empty headings.
BaseSolanaPolygon+1markup-tools.x402tookit.comfrom $0.028 endpoints - LLocale and Formatting ToolsData & research
Format an amount as money for an ISO 4217 currency code in a locale; reports minor-unit digits; unknown codes rejected.
BaseSolanaPolygon+1locale-tools.x402tookit.comfrom $0.028 endpoints - IIndustry and Occupation CodesSearch & web
Link a NAICS industry to its top SOC occupations, or a SOC occupation to its top industries, from the BLS employment matrix.
BaseSolanaPolygon+1industry-occupation-codes.x402tookit.comfrom $0.028 endpoints - HHydrology & Open-Channel CalcOther services
Critical depth where Froude number is 1 (Q^2/g = A^3/T) for rectangular, trapezoidal, triangular or circular channels.
BaseSolanaPolygon+1hydrology-calc.x402tookit.comfrom $0.028 endpoints - HHomePulseCrypto & DeFi
Smart home device recommendations and ecosystem advice for any country: Matter compatibility, ecosystem fit (Alexa, Google Home, Apple HomeKit), device picks by room and budget, and local plug/voltage/availability notes. For homeowner and smart-home agents. Returns recommended devices with Matter certification status and practical setup guidance.
BaseSolanaPolygon+8homepulse.theaslangroupllc.comfrom $0.087 endpoints - Ggrokbot-dashboard.a3migos.workers.devCrypto & DeFi
Base wallet research API: for any Base mainnet address returns ETH and USDC balances with USD values (CoinGecko/Coinbase quotes), EOA vs smart contract, nonce (tx count), current gas base fee, ERC-20 token holdings, and recent USDC inflows/outflows with a counterparty count. Read live from public Base RPCs at request time. Paid per call with x402 (USDC on Base); invalid input returns 400 and is no
Basegrokbot-dashboard.a3migos.workers.devfrom $0.0053 endpoints
Crypto Market SignalsCrypto & DeFiDaily crypto market regime in one call: BTC/ETH vs 20/50-day MAs, breadth of the point-in-time top-N (no survivorship bias), coins nearest a 20-day breakout, and the R1 breakout strategy's gate and entry signals. No candle fetching or indicator code. Completed UTC daily closes only.
Basegrok-backtest-api.fly.devfrom $0.015 endpoints- GGraph AlgorithmsOther services
Floyd-Warshall all-pairs shortest distances for up to 100 nodes; negative weights ok; detects negative cycles.
BaseSolanaPolygon+1graph-algorithms.x402tookit.comfrom $0.028 endpoints - Ffurigana.agentic-jp.comImages, audio & video
Convert kanji-mixed Japanese (JP) text to hiragana, katakana, or romaji (Hepburn/Nippon/Passport), with a per-token breakdown of surface form, reading, and part-of-speech. Backed by the kuromoji morphological analyzer. Use to generate ruby readings, build search indexes, or preprocess text for speech synthesis.
BasePolygonSolanafurigana.agentic-jp.comfrom $0.0013 endpoints - Fflorida-sirs-check.mick8511.workers.devSearch & web
Florida condo SIRS filing check: has a Florida condominium association reported a completed Structural Integrity Reserve Study to the state (DBPR)? Search by building or association name, optionally narrowed by city, zip or county.
Baseflorida-sirs-check.mick8511.workers.devfrom $0.011 endpoint - RRSS and Atom Feed ReaderImages, audio & video
Find a site's RSS and Atom feeds from a page URL: declared alternate links, else 5 common feed paths probed on the host.
BaseSolanaPolygon+1feed-reader.x402tookit.comfrom $0.038 endpoints - FFDA Drug LabelData & research
FDA drug label lookup — the newest prescribing information for a brand or generic drug name: boxed warning, indications, dosage, contraindications, warnings, adverse reactions and drug interactions as previews or one section in full, plus manufacturer, route, RxNorm, UNII and application numbers. Use to read what a drug is approved for and its official warnings.
BasePolygonArbitrum+1fda-drugs.use.x402atlas.comfrom $0.013 endpoints - FFathomCrypto & DeFi
Exit-liquidity and price-trust assessment for a Base ERC-20 token at a requested USD position size. On-chain sell quotes cover Aerodrome, Slipstream, and Uniswap V2/V3/V4. Returns tradeable, caution, illiquid, or unverified with executable proceeds, price impact, confidence, concerns, and unmeasured checks. Inputs: token address and size_usd.
Basefathom-api.mioku-fathom.workers.devfrom $0.0011 endpoint - FFanPulseImages, audio & video
Canonical in-universe chronology for fan and entertainment agents. Returns eras, pivotal events, watch/read order, and lore gaps for major franchises.
BaseSolanaPolygon+8fanpulse.theaslangroupllc.comfrom $0.087 endpoints - AApiToll Multi-Chain EVM GasCrypto & DeFi
Multi-chain EVM gas price oracle for AI agents — 17 chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Avalanche…). One x402 call returns slow/standard/fast EIP-1559 tiers as DROP-IN maxFeePerGas + maxPriorityFeePerGas in wei (plug straight into a viem/ethers tx, no conversion, exact even on sub-gwei L2s), plus base fee, head block, and fullness, from a live eth_feeHistory call. Pass ?chain
Baseevm-gas.apitoll.cloudfrom $0.0011 endpoint - EEnvironment ScreenOther services
Daily mean PM2.5, PM10, ozone, NO2 and US AQI over a date range, plus the count of days above an AQI threshold.
BaseSolanaPolygon+1environment-screen.x402tookit.comfrom $0.028 endpoints - EEmoji ToolsSearch & web
Analyze text (max 2000 chars): emoji count, distinct emoji, grapheme clusters, unqualified and text-presentation forms.
BaseSolanaPolygon+1emoji-tools.x402tookit.comfrom $0.028 endpoints - EElectrical CalculatorsOther services
Battery bank layout (series and parallel counts) and runtime from load, voltage, Ah, depth of discharge and efficiency.
BaseSolanaPolygon+1electrical-calc.x402tookit.comfrom $0.028 endpoints - Ddomain.hugen.tokyoCrypto & DeFi
WHOIS registration lookup — registrar, creation/expiry/updated dates, domain age in days, name servers, DNSSEC, registrant country/org, EPP status codes. All TLDs (.com .net .org .io .dev .ai ccTLDs gTLDs). Per-field error resilience for TLD-specific parsing quirks. No WHOIS library setup or TLD-specific parsing needed. Accepts USDC payments on Base and Solana
BaseSolanadomain.hugen.tokyofrom $0.017 endpoints - Ccontextiq.trango-compute.comCrypto & DeFi
Token Inspector model pricing (per call)
Basecontextiq.trango-compute.comfrom $0.024 endpoints - CColor schemeDeveloper tools
Find the nearest CSS named color to a given color, by perceptual distance.
Basecolor.openverbs.comfrom $0.0024 endpoints - BBlockpinCrypto & DeFi
Solana flow and income check: rebuilds SOL or SPL token payments into and out of a wallet or treasury from its latest transactions, groups them by payer and recipient (wallets vs program accounts such as pools and fee vaults), excludes self-payments and optional owner top-ups, flags token-account delegates, and compares an optional claim=. Covers the latest 35 transactions on the public RPC. By Bl
Robinhood ChainBasecheck.blockpin.devfrom $0.057 endpoints - Ccashboard.liveCrypto & DeFi
The stored open interest series of one Hyperliquid perp over the last 15, 60 or 240 minutes, from Cashboard's own minute-by-minute history: open interest in contracts and USD, mark price and funding APR per point, and the change over the window. Points are 1, 2 or 5 minutes apart. Not charged until the history reaches back over the whole window and has a snapshot from the last two minutes. Names a
BaseSolanacashboard.livefrom $0.017 endpoints - FFaroAI & agents
Single-signal check: is this website's pricing machine-readable for AI agents? Detects Offer schema with price/availability and pricing-transparency signals. Returns yes/no plus underlying checks and fixes. Useful for procurement and comparison agents.
Basebyfaro.aifrom $0.012 endpoints - BBank and Tax ID ValidatorsOther services
Check a US ABA routing number: 3-7-1 weighted checksum and the Federal Reserve district from the prefix.
BaseSolanaPolygon+1bank-validators.x402tookit.comfrom $0.028 endpoints - Aagoreum.xyzCrypto & DeFi
Looks an agent up in the ERC-8004 registries on Base: owner, agent wallet, registration, services, reputation summary, and whether an address is really the agent's.
Baseagoreum.xyzfrom $0.106 endpoints
Service data comes from the Coinbase CDP and PayAI discovery lists and refreshes every few hours. Usage is paid calls over the last 30 days. APIs launched here are verified by us; the rest are paid directly to their owners.