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fastapi.online — Latest Block Lookup
x402
fastapi.online — Latest Block Lookup is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0005/call, status down (last checked 2026-10-30).
Returns the latest block number and metadata for a specified EVM-compatible blockchain network
Price / call$0.0005
Success—
StatusDown
How this service works
Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.
Output
Returns the latest block number and associated metadata (such as timestamp, hash, or block height) for the specified EVM-compatible chain (ethereum, base, polygon, arbitrum, or optimism).
Example use cases
Monitor Ethereum chain progress
“Can you check what the latest block number is on Ethereum for me right now?”
Verify Polygon sync status
“What's the current block on Polygon? I want to make sure my node is in sync with the network.”
Track Arbitrum block height
“Fetch the latest block on Arbitrum — I need to know the current chain height for my app.”
Technical details
Endpoint
POSThttps://api.fastapi.online/latest-block?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call lookup of the current block height or latest block metadata on a major EVM network without needing a full blockchain node or RPC subscription. Particularly useful for lightweight agents that need occasional blockchain state checks without ongoing infrastructure costs.
Side effects
- Unsupported chain name returns a validation error
- Network connectivity issues may cause timeouts
- Payment failure (insufficient USDC) results in HTTP 402 before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string |
Tags
x402
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