{"uid":"cap_tLk6-4Vi1WRmKwRl_S7BX","slug":"sindri-physical-constants-lookup-06bd6d63","name":"Sindri Physical Constants Lookup","description":"Lookup of standard physical constants (speed of light, gravitational constant, Planck constant, elementary charge, Avogadro number, Boltzmann constant, gas constant, electron mass) with exact published CODATA values.","url":"https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/physicalConstants?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"constant":{"enum":["speedOfLight","gravitationalConstant","planckConstant","elementaryCharge","avogadroNumber","boltzmannConstant","gasConstant","electronMass"],"type":"string","description":"Which constant to look up."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_qTCdP8LwWGp3wT9agZvrG","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns exact CODATA-published values for eight fundamental physical constants given a constant name enum.","exampleAgentPrompt":"What's the exact CODATA value of the Boltzmann constant? Use the physical constants lookup for boltzmannConstant.","exampleUseCases":[{"title":"Physics calculation grounding","prompt":"I'm doing a thermodynamics calculation and need the exact CODATA value of the Boltzmann constant — can you look that up for me?"},{"title":"Science homework fact-check","prompt":"What is the exact published value of Avogadro's number according to CODATA? I want to make sure I'm using the right figure."},{"title":"Unit conversion pre-step","prompt":"Before I convert some energy units, I need the exact value of the Planck constant — can you fetch the CODATA value?"}],"resultDescription":"Returns the exact CODATA-published numeric value and unit for the requested physical constant (e.g. speed of light: 299792458 m/s, gravitational constant: 6.67430e-11 N⋅m²/kg²).","failureModes":["Invalid or unsupported constant name returns an error — only the eight enumerated constants are supported","Malformed request body (missing 'constant' field) returns a validation error","Lambda cold start may add latency on first call","Payment failure or insufficient USDC balance blocks the request"],"whenToPreferThis":"Use this endpoint when you need authoritative, exact CODATA values for fundamental physical constants rather than relying on an LLM's memorized (and potentially imprecise) training data. Ideal for scientific calculations, unit conversions, or any workflow requiring high-precision constant values.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T00:46:42.001Z","isFirstParty":false,"canonicalSlug":"sindri-physical-constants-lookup-06bd6d63"}