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Radion RPC speaks standard Polygon JSON-RPC. Send a POST with a JSON body: jsonrpc, id, method, and params.

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Common methods

MethodWhat it does
eth_blockNumberLatest block number
eth_getBlockByNumberA block and its transactions
eth_getBalanceNative balance of an address
eth_callRead a contract without a transaction
eth_getLogsEvent logs for a filter
eth_getTransactionReceiptReceipt for a transaction hash
eth_chainIdChain id (137 for Polygon)
Only read methods are open. Methods that submit transactions, like eth_sendRawTransaction, are not part of this endpoint.

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Batch requests

Send an array of calls in one request. You get an array of results back, in the same order.
Batch
curl "https://rpc.radion.app" \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '[
    {"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]},
    {"jsonrpc":"2.0","id":2,"method":"eth_chainId","params":[]}
  ]'

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Limits on eth_getLogs

Large log queries are capped to keep the node fast. Keep block ranges small and filter by address and topic. If a query is too wide, split it into smaller ranges.
Last modified on July 7, 2026