unconfirmed_txs - Cosmos

Example code for the unconfirmed_txs JSON-RPC method. Complete guide on how to use unconfirmed_txs JSON-RPC in GetBlock Web3 documentation.

Returns transactions currently in the mempool. By default returns up to 30 — use limit to adjust. Useful for mempool monitoring and MEV analytics where allowed.

Parameters

Parameter	Type	Required	Description
limit	integer	No	Maximum transactions to return (default: 30)

Request Example

cURL

# JSON-RPC over HTTP POST (canonical)
curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/unconfirmed_txs' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "unconfirmed_txs",
    "params": {
        "limit": 30
    },
    "id": "getblock.io"
}'

# URI over HTTP GET (alternate, for simple methods)
curl --location --request GET 'https://go.getblock.io/<ACCESS-TOKEN>/unconfirmed_txs?limit=30'

JavaScript (Axios)

Python (Requests)

Rust (Reqwest)

Response Example

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "n_txs": "5",
        "total": "5",
        "total_bytes": "8420",
        "txs": [
            "Co0BCooBChwvY29zbW9zLmJhbmsudjFiZXRhMS5Nc2dTZW5kEmoKLWNvc21vczF0NnJsZ2Y4MGpkOHRhbnBubnZtbXhmcWRjbTljbjd3Y3RyczdoaxItY29zbW9zMWdoZDc1M3NoamVjajRpdjJ4Mmk4eHJrenphbnpqdnZjMjJ4MmtuGgoKBXVhdG9tEgExEnIKWg=="
        ]
    }
}

Response Parameters

Field	Type	Description
result.n_txs	string	Number of transactions returned
result.total	string	Total transactions in the mempool
result.total_bytes	string	Total mempool size in bytes
result.txs	array of string	Base64-encoded transaction bytes

Use Cases

• Mempool monitoring dashboards

• Validator-side fee market analysis

• Pending-transaction surveillance

Error Handling

Status Code	Error Message	Cause
404	Not Found	Missing or invalid <ACCESS-TOKEN>
-32602	Invalid params	Request parameters are missing or malformed
-32603	Internal error	Server-side error while processing the request
429	Too Many Requests	Rate limit exceeded for your plan

SDK Integration

CosmJS

import { Tendermint37Client, HttpClient } from '@cosmjs/tendermint-rpc';

const httpClient = new HttpClient('https://go.getblock.io/<ACCESS-TOKEN>/');
const client = await Tendermint37Client.create(httpClient);

// CosmJS exposes typed methods on the client (e.g. client.status(), client.block()).
// For raw access to any RPC method:
const result = await httpClient.execute({"jsonrpc": "2.0", "id": "getblock.io", "method": "unconfirmed_txs", "params": {"limit": 30}});
console.log(result);

cosmpy / requests