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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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393 results- AAutomotive CalculatorsOther services
Estimate quarter-mile time and trap speed from weight and horsepower (Hale), plus a power-limited lower bound for 0-60 mph.
BaseSolanaPolygon+1automotive-calc.x402tookit.comfrom $0.0210 endpoints - FFarm & Garden CalcCrypto & DeFi
Hargreaves reference evapotranspiration (mm/day) from max and min temperature, latitude and day of year.
BaseSolanaPolygon+1agri-calc.x402tookit.comfrom $0.0210 endpoints - RRacingPulseSocial & people
Statistically-backed racing angles — trainer/jockey combos and trends. For horse-racing betting agents.
BaseSolanaPolygon+8racingpulse.theaslangroupllc.comfrom $0.0213 endpoints - LLegalPulseSocial & people
Trademark knock-out check with live official verification: name in, conflict risk verdict out. Candidate conflicting marks are looked up in the USPTO TSDR system in real time and returned as verbatim official records (LIVE/DEAD status, owner, classes, dates) — research leads that could not be officially verified are labeled as such. US federal register; names the right register for non-US markets.
BaseSolanaPolygon+8legalpulse.theaslangroupllc.comfrom $0.0814 endpoints - BBitcoin NetworkDeveloper tools
Bitcoin network health: tip height, block pace vs 10 minutes, difficulty retarget forecast, hashrate trend and Lightning size.
BaseSolanaPolygon+1bitcoin-network.x402tookit.comfrom $0.028 endpoints - BBicycle Gearing & Fit CalcCrypto & DeFi
Cadence needed to hold a target speed in a given gear, and the chainring-to-cog ratio needed for a speed at a cadence.
BaseSolanaPolygon+1bike-calc.x402tookit.comfrom $0.028 endpoints - CCrypto Perp Funding & SentimentCrypto & DeFi
Supported perpetual-futures trading pairs — the list of symbols (BTCUSDT, ETHUSDT, …) the funding-rate scanner and signals cover, as a clean snake_case envelope.
BasePolygonArbitrum+1perpsignals.use.x402atlas.comfrom $0.0053 endpoints - LLand Survey ScreeningOther services
Great-circle distance (miles, km, feet, nautical miles) and initial compass bearing between two latitude/longitude points.
BaseSolanaPolygon+1land-survey.x402tookit.comfrom $0.028 endpoints - GGrades & Study CalcOther services
Score needed on a final exam (or any remaining work) to reach a target class grade, from current grade and its weight.
BaseSolanaPolygon+1grades-calc.x402tookit.comfrom $0.028 endpoints
AxonGateCrypto & DeFiScan untrusted text (a web page, email, tool output or document) for prompt-injection and agent-hijacking patterns before it reaches an LLM. Returns a risk level, score, findings with offsets and a sanitized copy. Deterministic, sub-50ms.
BasePolygonArbitrumapi.axongate.onefrom $0.0029 endpoints- SSpecies and BiodiversitySearch & web
Parse a scientific name into genus, species epithet, subspecies or variety, authorship and year, and check capitalisation.
BaseSolanaPolygon+1biodiversity.x402tookit.comfrom $0.028 endpoints - PParty & Event PlannerOther services
Tip and even bill split in exact cents: tip on subtotal or total, shares that add up, optional round up to whole dollars.
BaseSolanaPolygon+1party-event-calc.x402tookit.comfrom $0.029 endpoints - NNumber WordsDeveloper tools
Write a money amount in words for a cheque (EN/ES/FR/DE): you give the currency names, no rates; words or 56/100 cents.
BaseSolanaPolygon+1number-words.x402tookit.comfrom $0.029 endpoints - MMusic Production CalcImages, audio & video
Camelot wheel code for a musical key and its harmonic-mixing matches; optionally test if two keys mix.
BaseSolanaPolygon+1music-production-calc.x402tookit.comfrom $0.029 endpoints - MMarket and Holiday CalendarMarkets & finance
Is a date a public holiday in a country? Also whether it is a business day and the next holiday after it.
BaseSolanaPolygon+1market-calendar.x402tookit.comfrom $0.029 endpoints - LLicense IntelSearch & web
Check a list of license ids against SPDX: current, deprecated or unknown, with the modern GNU -only / -or-later form.
BaseSolanaPolygon+1license-intel.x402tookit.comfrom $0.029 endpoints - JJSON and Data ToolsDeveloper tools
Parse CSV text (quotes, escaped quotes, embedded commas and newlines) into JSON rows, detecting the delimiter.
BaseSolanaPolygon+1json-data-tools.x402tookit.comfrom $0.029 endpoints - IIdentifier ValidatorsData & research
Validate a 9-character CUSIP security identifier check digit and split issuer and issue codes.
BaseSolanaPolygon+1id-validators.x402tookit.comfrom $0.029 endpoints - HHome Energy CalculatorsCrypto & DeFi
Estimate a monthly electricity bill from kWh with block-tier rates, a fixed monthly charge and a tax or fee percentage.
BaseSolanaPolygon+1home-energy-calc.x402tookit.comfrom $0.029 endpoints - FFinance CalculatorsMarkets & finance
Break-even units and revenue from fixed costs, unit price and unit variable cost, plus profit at a target volume.
BaseSolanaPolygon+1finance-calculators.x402tookit.comfrom $0.029 endpoints - FFile Format InspectorImages, audio & video
Compare a file name's extension with its real type from the first bytes; flags executables disguised as documents or images.
BaseSolanaPolygon+1file-formats.x402tookit.comfrom $0.029 endpoints - DDomain and DNS ChecksDeveloper tools
CAA records for a domain (walking up to parent names): which CAs may issue certificates, wildcard rules and reporting contacts.
BaseSolanaPolygon+1domain-dns.x402tookit.comfrom $0.029 endpoints - AAviation CalculatorsOther services
Density altitude from field elevation, altimeter setting and temperature, exact and by rule of thumb, with a performance flag.
BaseSolanaPolygon+1aviation-calc.x402tookit.comfrom $0.029 endpoints - SShipping & Logistics CalcOther services
How many identical boxes fit inside a larger box or crate: best of six orientations in a simple grid, with utilization.
BaseSolanaPolygon+1shipping-calc.x402tookit.comfrom $0.028 endpoints - HHarvestPulseAI & agents
Dirty Dozen & Clean Fifteen guide — which produce to buy organic: the EWG pesticide priority list and a smart organic buying strategy. For foodie and consumer agents.
BaseSolanaPolygon+8harvestpulse.theaslangroupllc.comfrom $0.0511 endpoints - FFindPulseMarkets & finance
Best product for my use case, what should I buy, product finder by need, product recommendation. For shopping and buyer agents: takes a use case plus optional budget and preferences and returns the top product picks for that specific need, with honest trade-offs and sourcing links.
BaseSolanaPolygon+8findpulse.theaslangroupllc.comfrom $0.0513 endpoints - CCitePulseAI & agents
Single-paper lookup by DOI or title for research agents — citation count, influence, open-access status with a direct legal-OA link (Unpaywall), venue, and a TLDR. Deterministic passthrough over OpenAlex + Semantic Scholar + Unpaywall, no synthesis, cheap and fast.
BaseSolanaPolygon+8citepulse.theaslangroupllc.comfrom $0.028 endpoints - FFood Barcode FactsOther services
Compare two packaged foods by barcode: Nutri-Score, NOVA, and per-100 g energy, sugars, saturated fat, salt, fibre and protein.
BaseSolanaPolygon+1food-barcode.x402tookit.comfrom $0.027 endpoints - WWork Time CalcOther services
Add or subtract N business days from a date, skipping weekends and your holiday list, WORKDAY style.
BaseSolanaPolygon+1work-time-calc.x402tookit.comfrom $0.029 endpoints - WWord ToolsOther services
Check whether two words or phrases are anagrams, ignoring case, spaces, punctuation and accents; shows the letter differences.
BaseSolanaPolygon+1word-tools.x402tookit.comfrom $0.029 endpoints
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