Wrong/Bad Alpaca Aggregate bar data

Alpaca’s aggregate bar data is showing a value of 1.1 for Open, High, Low, Close prices for Tesla on Friday, April 9th 2021.

There is no such trading activity when Tesla is currently trading above $670. How reliable is this data and why is it reporting a value of 1.1?

GET: https://data.alpaca.markets/v1/bars/1Min?symbols=TSLA&limit=30

Response:

{
    "TSLA": [
        {
            "t": 1617998280,
            "o": 676.55,
            "h": 676.72,
            "l": 676.49,
            "c": 676.51,
            "v": 3408
        },
        {
            "t": 1617998340,
            "o": 676.55,
            "h": 676.95,
            "l": 676.515,
            "c": 676.95,
            "v": 4169
        },
        {
            "t": 1618072440,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 120
        },
        {
            "t": 1618072500,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 3240
        },
        {
            "t": 1618072560,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 2760
        },
        {
            "t": 1618072620,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 3360
        },
        {
            "t": 1618072680,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 3000
        },
        {
            "t": 1618072740,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 2880
        },
        {
            "t": 1618072800,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5640
        },
        {
            "t": 1618072860,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 6240
        },
        {
            "t": 1618072920,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 6240
        },
        {
            "t": 1618072980,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5040
        },
        {
            "t": 1618073040,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5760
        },
        {
            "t": 1618073100,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 4800
        },
        {
            "t": 1618073160,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5280
        },
        {
            "t": 1618073220,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5040
        },
        {
            "t": 1618073280,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5880
        },
        {
            "t": 1618073340,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 6360
        },
        {
            "t": 1618073400,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 9720
        },
        {
            "t": 1618073460,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5280
        },
        {
            "t": 1618073520,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 4680
        },
        {
            "t": 1618073580,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 4800
        },
        {
            "t": 1618073640,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5280
        },
        {
            "t": 1618073700,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5640
        },
        {
            "t": 1618073760,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5280
        },
        {
            "t": 1618073820,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5880
        },
        {
            "t": 1618073880,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 8280
        },
        {
            "t": 1618073940,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5400
        },
        {
            "t": 1618074000,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 5040
        },
        {
            "t": 1618074060,
            "o": 1.1,
            "h": 1.1,
            "l": 1.1,
            "c": 1.1,
            "v": 960
        }
    ]
}
1 Like

I’m seeing the same thing… They ran maintenance to fix the bar data over the weekend, but I have to wonder if they didn’t mess something up in the process.

The Alpaca aggregate bar data was fixed by Apr 12 after the data issues that occurred on Apr 10. If interested, there is a recap of the problem and the resolution here.

1 Like

Thank you this addressed my question.