A Price Needs A Timestamp And A Source

A quote screen combines an observation about a market with a delivery process. The market timestamp describes when the provider says an event occurred. The fetch or receipt time describes when software obtained it. A successful refresh changes the second clock; it does not prove the underlying observation is new. If a timestamp is absent, freshness is unknown rather than zero seconds old.

Imagine two hypothetical observations arriving at 10:15:01 in the same time zone. One describes an event at 10:00:00; the other describes an event at 10:14:59. Both have just been received, but they have different ages. Before comparing them, also check the date, time zone, trading session and event type. A last trade is an executed transaction; a bid or ask is an offer to trade. Those values answer different questions.

Coverage matters alongside age. Alpaca documents IEX as an individual exchange feed and SIP as consolidated coverage across U.S. exchanges. A quote from one venue and a consolidated observation need not match. Alpaca also distinguishes feed access by the provider subscription. Its provider rights are separate from a Tradexers plan or an account connection.

Record the feed label before investigating a discrepancy. Then compare the same symbol, instrument, session, observation type and time. A stock share price, a fund value and an option contract price are not interchangeable. A price change may also be measured against a previous close that differs from your purchase price. Without these definitions, a green percentage is easy to misread.

Polling asks for updates at intervals; a stream delivers events over an open connection. Either can be interrupted or restricted. An open socket does not guarantee a new observation, full exchange coverage or a tradable price. A quiet security may have no recent event, and a disconnected consumer may still display its last known value.

In Tradexers, Auto requests an available authorized source and can fall back to the public Yahoo path. That fallback should be read using its actual source and freshness labels. Selecting Auto does not turn delayed data into real-time data. Paid streaming also depends on the configured private bridge, provider permissions and the current feature entitlement. Never infer provider access from the plan name alone.

For research, an older observation may still be useful if it is labeled and compared consistently. Before an order, inspect the broker's current order preview and available bid/ask information. Investor.gov explains that a market order's execution price is not guaranteed and the last trade is not necessarily its eventual fill price. A quote is evidence to interpret, not a promise of execution.

When values disagree, keep both source labels and timestamps in your notes. Refresh once, check the provider or broker directly, and postpone conclusions if the discrepancy remains unexplained. Repeatedly clicking refresh without identifying which clock or feed changed creates activity without resolving the uncertainty.

• Identify the provider, feed and event type
• Check event time separately from receipt time
• Compare the same instrument and session
• Treat missing freshness as unknown
• Verify execution details with the broker before acting