{"uid":"cap_ZSBGyUReWR6lZgJQTpLLk","slug":"api-carbon-cashmere-de-5be94a6a","name":"Carbon Cashmere Multi-Chain Block Height Monitor","description":"Professional crypto market intelligence. Real-time prices, signals, and market scoring.","url":"https://api.carbon-cashmere.de/v1/chains","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"chains":[{"chain":"base","last_update":"2026-04-25T10:30:03+00:00","latest_block":45161828},{"chain":"arbitrum","last_update":"2026-04-25T10:30:03+00:00","latest_block":456165363}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_LHpcvT6RLxnd_cdXk-gj4","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the latest block number and last-update timestamp for seven major blockchains: Arbitrum, Avalanche, Base, Ethereum, Optimism, Polygon, and Solana.","exampleAgentPrompt":"Check the latest block heights and update timestamps for all supported chains — Arbitrum, Avalanche, Base, Ethereum, Optimism, Polygon, and Solana — so I can see which ones are live and in sync right now.","exampleUseCases":null,"resultDescription":"Returns a JSON object with one entry per supported chain (Arbitrum, Avalanche, Base, Ethereum, Optimism, Polygon, Solana), each containing the latest block number and a timestamp of the last update, suitable for liveness checks and cross-chain sync comparisons.","failureModes":["Upstream node unavailable for one or more chains — partial data returned or stale timestamps","Rate limit exceeded — HTTP 429 with retry-after header","Payment not processed — HTTP 402 if x402 payment header is missing or invalid","All chains unavailable — HTTP 503 or empty response"],"whenToPreferThis":"Choose this endpoint when you need a single call to get current block heights across multiple EVM-compatible chains plus Solana simultaneously — ideal for cross-chain settlement checks, liveness monitoring, or detecting chain sync lag before triggering multi-chain operations. Prefer over chain-specific RPC calls when breadth across seven chains matters more than deep per-chain data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:57:17.742Z","isFirstParty":false}