{"uid":"cap_GRtZujYZvYos_UBfHZlzc","slug":"physics-constants-list-api-19290f8e","name":"Physics Constants List API","description":"List every physical constant in the dataset, or only those in a given category (universal, adopted, electromagnetic, atomic, physico-chemical). Returns the constants, the total count and the set of available categories.","url":"https://physics.openverbs.com/v1/list","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"type":"object","properties":{"category":{"type":"string","maxLength":30,"minLength":1,"description":"One of: universal, adopted, electromagnetic, atomic, physico-chemical."}},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","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":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_SLGRduTxd3xKsrBhMml3w","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Lists all physical constants in the dataset, optionally filtered by category (universal, adopted, electromagnetic, atomic, physico-chemical), returning constants, total count, and available categories.","exampleAgentPrompt":"Can you list all the electromagnetic physical constants available in the physics constants dataset?","exampleUseCases":[{"title":"Browse all available physics constants","prompt":"Show me every physical constant available in the dataset — I want to see the full list."},{"title":"Filter constants by category","prompt":"Can you pull up all the atomic physical constants from the physics constants database?"},{"title":"Discover available constant categories","prompt":"What categories of physical constants are available, and what constants fall under physico-chemical?"}],"resultDescription":"Returns a list of physical constants (each with key, symbol, name, value, and unit), the total count of constants returned, and the set of available categories (universal, adopted, electromagnetic, atomic, physico-chemical).","failureModes":["Invalid category string returns an error or empty result","Category value exceeding 30 characters is rejected by schema validation","Network timeout on slow connections","Payment failure via x402 protocol blocks the request"],"whenToPreferThis":"Use this endpoint when you need to enumerate or browse the full set of physical constants, or want to filter by a known category. Prefer this over the search endpoint when you don't have a specific constant in mind but want to explore what's available. Use the lookup or search endpoints instead when you know the exact key, symbol, or name of the constant you need.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:34:25.658Z","isFirstParty":false}