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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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73 results- PPlumbing & Pipe Flow CalcOther services
Flow rate in gpm and litres per minute from a bucket test: container volume and seconds to fill, with a daily-use estimate.
BaseSolanaPolygon+1plumbing-calc.x402tookit.comfrom $0.022 endpoints - UUnicode Text Safety ToolsOther services
Detect Trojan Source bidi controls (CVE-2021-42574): overrides, isolates, unbalanced openers, stray closers, with positions.
BaseSolanaPolygon+1unicode-text-tools.x402tookit.comfrom $0.023 endpoints - SStar CatalogOther services
List catalogued stars in an IAU constellation (name or 3-letter code), brightest first, with an optional named-only filter.
BaseSolanaPolygon+1star-catalog.x402tookit.comfrom $0.022 endpoints - Aapi.borisinc.comOther services
No description yet.
BaseSolanaPolygon+1api.borisinc.comfrom $0.0011 endpoint - PPortfolio StatsOther services
Rolling mean return and rolling annualized volatility over a window, from a price or return series you supply.
BaseSolanaPolygon+1portfolio-stats.x402tookit.comfrom $0.021 endpoint - PPhysics CalculatorsOther services
Blackbody radiation: Wien peak wavelength and frequency, Stefan-Boltzmann power per area, and total power for an area or sphere.
BaseSolanaPolygon+1physics-calc.x402tookit.comfrom $0.021 endpoint - SSupplier CheckOther services
Screen a US-listed company by CIK: severe 8-K items, late-filing notices, going-concern wording, LEI status. Never says safe.
BaseSolanaPolygon+1supplier-check.x402tookit.comfrom $0.751 endpoint - SSun, Moon and PlanetsOther services
Sunrise, sunset, solar noon, three twilights, golden and blue hour for a lat/lon and date; handles polar day and night.
BaseSolanaPolygon+1sky-calc.x402tookit.comfrom $0.021 endpoint - Xx402.quicknode.comOther services
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Polygonx402.quicknode.comfrom $0.0011 endpoint - Xx402.payai.networkOther services
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BasePolygonX Layer+1x402.payai.networkfrom $0.014 endpoints - Xx402.nichospt.netOther services
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Polygonx402.nichospt.netfrom $0.00058 endpoints - Llokyai.comOther services
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Polygonlokyai.comfrom $0.00016 endpoints - Aaviationapis.comOther services
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Polygonaviationapis.comfrom $0.0114 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.