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What TxLINE StablePrice provides

TxLINE’s StablePrice feed delivers de-margined consensus odds — outcome probabilities that sum to approximately 100%. This means the market’s bookmaker margin has already been removed, producing a clean fair-value signal anchored to consensus across multiple books. Veridex verified this live: StablePrice odds are de-margined consensus with probabilities summing to ~100%, making them the correct fair-value input for closing-line value (CLV) scoring. Because the feed is already de-vigged, Veridex never re-de-vigs the probabilities — applying a second margin removal to an already-fair probability would manufacture phantom edge. Concretely, StablePrice Pct values arrive as de-margined consensus probabilities in basis points (stable_prob_bps), and decimal odds are extracted from TxLINE Prices (divided by 1000). Both quantities are produced by a single normalizer that runs identically for live and replay data — the live feed and ReplayPacks share the same projection.

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The two data paths

Veridex uses TxLINE data through two distinct paths depending on the run mode. Live SSE stream — For live agents and the live-window runner, Veridex connects to GET /api/odds/stream as a Server-Sent Events feed. The stream delivers real-time StablePrice odds movements, which the live runner ingests tick by tick as they arrive. Ticks are never buffered and re-replayed; the live runner processes each tick in real time. An async recorder can capture the raw stream to a session directory for later ReplayPack creation. Historical odds updates for replay and backtest — For ReplayPacks and backtests, Veridex uses GET /api/odds/updates/{fixtureId} to retrieve the full odds movement history for a finished fixture in a single call. This endpoint returned the entire pre-match-through-in-play update history — tens of thousands of updates spanning multiple days — for the World Cup fixtures used in the real-data experiment (65,156 StablePrice updates for USA v Bosnia alone). This history is the backbone of both closing-line reconstruction and the sealed real-fixture backtest.

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TxLINE endpoints Veridex uses

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What StablePrice means in practice

CLV is computed entirely within the StablePrice probability space: entry stable_prob_bps for the chosen side versus closing stable_prob_bps for the same side. Because the feed is already de-margined, bookmaker margin never contaminates the skill metric. The same fair probability also serves as the EV input for forward executable edge at a venue price, keeping the entire quantitative vocabulary anchored to one consensus fair-value source. Veridex confirmed this empirically during the real-data experiment: the outcome probabilities for scored markets summed to approximately 100%, confirming the de-margined consensus property that CLV scoring relies on.

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On-chain subscription

Live TxLINE data access requires an on-chain devnet subscription. The auth flow is a three-step sequence:
  1. POST /auth/guest/start mints an IP-bound guest JWT.
  2. An on-chain subscribe() transaction is sent on Solana devnet — a real signed transaction built from a typed-config keypair. The devnet transaction signature is publicly checkable on the Solana explorer.
  3. POST /api/token/activate exchanges the JWT and subscribe signature for the X-Api-Token used on all data calls.
The on-chain subscribe transaction is part of the Veridex proof record. The devnet anchor confirmation measured at approximately 1.3 seconds in live testing.

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Data integrity

Veridex probes TxLINE’s Merkle validation endpoint (GET /api/odds/validation) to verify that sealed odds inputs are authentic TxLINE data. In the real-data experiment, 269 of 270 sampled World Cup odds returned valid Merkle inclusion proofs. This means the law recompute proves the math is faithful to the sealed inputs, and the Merkle check proves those sealed inputs are genuine TxLINE data — not values Veridex edited or fabricated. One sampled odds record did not return a valid proof, which is reported honestly rather than concealed. The validation endpoint uses validateOdds, never validateStat, and an unknown evidence kind raises an error rather than mislabeling the proof type.
Raw vendor odds from real fixtures are not redistributed — TxLINE data is licensed. What Veridex ships is the sealed pipeline, the proof discipline, and the ReplayPack mechanics. The real-fixture pipeline ran against local copies of the licensed data during the World Cup experiment.