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OneSource Ethereum Block Number RPC
x402
OneSource Ethereum Block Number RPC is a paid API for AI agents from api.onesource.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Returns the current latest block number for Ethereum mainnet or Sepolia testnet from OneSource-operated nodes
Price / call$0.001
Success—
StatusUnknown
How this service works
Latest Ethereum block height - current chain tip via eth_blockNumber
Output
A JSON object containing the network name (e.g. 'ethereum') and the current block number as a hex string (e.g. '0x133da1e'), representing the latest confirmed block on the requested Ethereum network.
Example use cases
Example prompt
“What's the current block number on Ethereum mainnet right now?”
Technical details
Endpoint
GEThttps://api.onesource.io/api/chain/block-numberWhen to prefer
Use this endpoint when an AI agent needs real-time Ethereum chain head data without managing API keys, and wants to pay per call using USDC on Base via x402 or pathUSD/USDC.e on Tempo. Ideal for agents that need lightweight block height checks on mainnet or Sepolia testnet as a building block for polling, confirmation tracking, or chain sync verification.
Side effects
- Invalid network enum value returns an error — only 'ethereum' and 'sepolia' are accepted
- Payment failure via x402 (USDC on Base) prevents the call from being processed
- Node unavailability or network outage may cause timeouts or 5xx errors
- Hex block number may confuse consumers expecting a decimal integer — conversion required
Input
{
"network": "sepolia"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"data": {
"result": "0xa87b78"
},
"meta": {
"endpoint": "/api/chain/block-number",
"request_id": "2fcd6aebe380e534"
}
}Schema · Response
{
"type": "json",
"example": {
"data": {
"result": "0x133da1e"
},
"meta": {
"endpoint": "/api/chain/block-number",
"cost_usdc": "0.001",
"request_id": "00000000abcdef01",
"payment_chain": "base",
"payment_token": "USDC"
}
}
}Tags
x402
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