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Ethereum Pending Block (Mempool) Fetcher
x402
Ethereum Pending Block (Mempool) Fetcher is a paid API for AI agents from skills.onesource.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns the pending Ethereum block containing mempool transactions not yet mined, using eth_getBlockByNumber('pending'), across multiple EVM-compatible networks
Price / call$0.01
Success—
StatusUnknown
How this service works
Fetches pending chain data for monitoring in-flight blockchain activity.
Output
Returns the full pending block object including an array of unconfirmed mempool transactions (with their hashes, from/to addresses, value, gas, data, etc.) and block header fields — response can be very large (100k+ bytes) since it may contain hundreds of pending transactions.
Example use cases
Example prompt
“What transactions are currently sitting in the Ethereum mempool waiting to be mined — can you pull the pending block right now?”
Technical details
Endpoint
GEThttps://skills.onesource.io/api/chain/pendingWhen to prefer
Use this endpoint when you need a real-time snapshot of unconfirmed Ethereum (or EVM-compatible) transactions before they are mined — ideal for MEV research, front-running detection, gas price analysis, or monitoring specific pending transactions. Prefer this over block-by-number endpoints when you specifically need the unmined mempool state rather than confirmed blocks.
Side effects
- Unsupported network value returns validation error
- Network RPC unavailability causes timeout or 5xx error
- Pending block may be empty if mempool is quiet
- Response truncated for very large mempools
- Payment failure returns 402 if USDC balance insufficient
Input
{
"network": "sepolia"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"_bytes": 262144,
"_preview": "{\"data\":{\"result\":{\"hash\":\"0x5a4dff1eeba20ee01b02661bb163632fa2226cce48c198bdad69626457ed934b\",\"parentHash\":\"0x182ce857225703cf2fcd40ee5bfc7cc4f788453c364a456f104efd4001291381\",\"sha3Uncles\":\"0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347\",\"miner\":\"0x14627ea0e2b27b817dbff94c3da383bb73f8c30b\",\"stateRoot\":\"0x0000000000000000000000000000000000000000000000000000000000000000\",\"transactionsRoot\":\"0x3a4aa9035c4c7ddb85e959603c886a4983d75ffb914bc5743aa815f7cedf1421\",\"receiptsRoot\":\"0xe42c73fb5f81a3fd90d7f820e3a7d76cf68a83df51c1bd22270191ac2692c03e\",\"logsBloom\":\"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\",\"difficulty\":\"0x0\",\"number\":\"0xa713ad\",\"gasLimit\":\"0x3938700\",\"gasUsed\":\"0x1c21911\",\"timestamp\":\"0x6a19f5d4\",\"extraData\":\"0xd883011103846765746888676f312e32362e33856c696e7578\",\"mixHash\":\"0xb546cff555451ee297e0264fbbeac59260e6099df90efb4035e308c119d52d7e\",\"nonce\":\"0x0000000000000000\",\"baseFeePerGas\":\"0x4654e175\",\"withdrawalsRoot\":\"0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421\",\"blobGasUsed\":\"0x2a0000\",\"excessBlobGas\":\"0xc692404\",\"parentBeaconBlockRoot\":\"0x6dc93a1e2692f1d0d3d5a7302ea2cc1f2b35ffb67e450510df4032a07eafd66e\",\"requestsHash\":\"0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855\",\"size\":\"0x1b6b1\",\"uncles\":[],\"transactions\":[{\"type\":\"0x0\",\"chainId\":\"0xaa36a7\",\"nonce\":\"0x64e\",\"gasPrice\":\"0x121adb700\",\"gas\":\"0x249f0\",\"to\":\"0xe815718d44694ec4637cb775c468d87f6e15b538\",\"value\":\"0x0\",\"input\":\"0x095ea7b3000000000000000000000000e815718d44694ec4637cb775c468d87f",
"_truncated": true,
"_contentType": "application/json"
}Tags
x402
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