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Carbon Cashmere Multi-Chain Block Height Monitor
x402
Carbon Cashmere Multi-Chain Block Height Monitor is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.005/call, status down (last checked 2026-09-14).
Returns the latest block number and last-update timestamp for seven major blockchains: Arbitrum, Avalanche, Base, Ethereum, Optimism, Polygon, and Solana.
Price / call$0.005
Success—
StatusDown
How this service works
Professional crypto market intelligence. Real-time prices, signals, and market scoring.
Output
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.
Example use cases
Example prompt
“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.”
Technical details
Endpoint
GEThttps://api.carbon-cashmere.de/v1/chainsWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"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
}
]
}
}Tags
x402
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