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PJM Nowcast – Real-Time LMP & Load Descriptive Statistics
x402
PJM Nowcast – Real-Time LMP & Load Descriptive Statistics is a paid API for AI agents from pjm-nowcast-production.up.railway.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Returns trailing and semi-live descriptive statistics on PJM RTO Locational Marginal Prices (LMP), zonal LMP spreads, and RTO load as of a specified ISO-8601 timestamp.
Price / call$0.02
Success—
StatusUnknown
How this service works
Trailing and semi-live descriptive statistics on PJM RTO LMP, selected zonal LMP price spreads, and RTO load. Not a forecast, signal, trading recommendation, or advice. Not a substitute for official PJM data products. Buyer beware: figures are aggregated from public market sources; freshness equals the last successful background poll. Descriptive statistics only. Not a forecast, signal, or trading recommendation. Aggregated from public market sources. Freshness depends on the last successful background poll.
Output
A JSON envelope containing: always-present fields (asOf, polledAt, ageSeconds, maxAgeSeconds, stale); RTO LMP descriptive stats object; RTO load stats object; zonal LMP spread object; prior period comparison object; rolling realized LMP std (price_vol in $/MWh); mixture std of LMP (mix_std_price); observation count (mix_n_obs); HMM regime fields (kStar, entropy, posteriors); resolution, windowHours, product, timezone, and disclaimer strings. Returns null for optional fields when data is unavailable.
Example use cases
Real-time energy trading desk monitoring
“Give me the PJM nowcast as of 2024-01-15T14:30:00Z — I need to see the RTO LMP stats, price_vol, and whether the data is stale before I make any decisions.”
Grid analyst regime detection check
“What is the current PJM hidden Markov model regime state and entropy as of this moment? Pull the posteriors and kStar so I can understand what pricing regime we are in right now.”
Automated alert for price volatility spike
“Check the PJM nowcast as of the current time and tell me if price_vol is above 5 $/MWh and how many observations backed that figure — flag it if the data is stale.”
Technical details
Endpoint
POSThttps://pjm-nowcast-production.up.railway.app/v1/nowcast/asofWhen to prefer
Use this endpoint when you need near-real-time descriptive statistics on PJM wholesale electricity prices and load — specifically RTO LMP, zonal spreads, and rolling realized volatility — without building your own PJM data pipeline. Prefer this over scraping PJM directly when you need a structured JSON response with pre-computed statistics. Note it is not a forecast, not a trading signal, and not a substitute for official PJM data products; use it for informational monitoring or enrichment only.
Side effects
- Missing or malformed asOf field returns a 400-level error
- Stale data when background poller has not refreshed recently (stale: true, ageSeconds > maxAgeSeconds)
- price_vol is null when price_vol_missing is true (insufficient recent prints)
- Service may be temporarily unavailable if the Railway.app deployment is down
- Payment failure (x402 protocol) if insufficient USDC balance or misconfigured payment header
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| asOfrequired | string | ISO-8601 observation clock. Required. No interpolation. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| asOf | string | |
| kStar | — | Regime route. Dominant state index. |
| stale | boolean | |
| rtoLmp | object | |
| entropy | — | Regime route. HMM entropy; not a forecast. |
| product | string | |
| rtoLoad | object | |
| polledAt | string | |
| timezone | string | |
| mix_n_obs | — | Latest only. Observation count paired with mix_std_price. |
| price_vol | — | Latest only. Rolling realized LMP std in $/MWh from the last 8 SQLite RTO LMP prints (RMS of successive diffs; not annualized Black vol, not rtoLmp.std). Null when price_vol_missing is true. |
| ageSeconds | integer | |
| disclaimer | string | |
| posteriors | array | Regime route. State posteriors. |
| resolution | string | |
| priorPeriod | object | |
| windowHours | integer | |
| zonalSpread | object | |
| maxAgeSeconds | integer | |
| mix_std_price | — | Latest only. Mixture std of RTO LMP in $/MWh from the poller mix.json sidecar. Not price_vol and not rtoLmp.std. |
| observationCount | integer | |
| price_vol_missing | boolean |
Tags
x402
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