# OneChronos

**Canonical:** https://apis.io/providers/onechronos/  
**Website:** https://www.onechronos.com/  
**APIs profiled:** 3

OneChronos operates AI-powered "Smart Market" alternative trading systems that match institutional orders using Nobel Prize-winning combinatorial auction techniques and mathematical optimization rather than traditional price-time priority matching. Operated by OneChronos Markets LLC, a broker-dealer subsidiary of OCX Group Inc., the venue runs point-in-time periodic auctions roughly ten times per second across US equities (a dark ATS launched in 2022), spot foreign exchange, and UK/EU equities multilateral trading facilities. Subscribers connect and submit orders electronically over a modern variant of the FIX 4.2 protocol, with "expressive bidding" that lets traders encode custom constraints, spreads, pairs, portfolio and hedging strategies into each auction.

## Kin Score — 22.4 / 100 (emerging)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 22.4).

| Facet | Score |
|---|---|
| Discoverability | 72.2 |
| Contract Quality | 0.0 |
| Governance | 12.5 |
| Operational Transparency | 5.3 |
| Developer Ergonomics | 41.3 |
| Commercial Clarity | 21.1 |

Regulatory layer — **Securities & Market Data**: 25.0 (matched via tags).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (3)

- **OneChronos US Equities ATS (FIX 4.2)** — Order entry and execution for the OneChronos US equities dark ATS over a modern variant of the FIX 4.2 protocol. Standard and Target orders, and Expressive Bids, are submitted e...
- **OneChronos FX Smart Market (FIX 4.2)** — Order entry for the OneChronos spot foreign exchange Smart Market over the FIX 4.2 protocol variant, applying the same combinatorial-auction matching to global FX.
- **OneChronos European Equities MTF (FIX 4.2)** — Order entry for the OneChronos UK and EU equities multilateral trading facilities over the FIX 4.2 protocol variant.

## Security (1)

- **Onechronos Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Financial Services, Capital Markets, Trading, Equities, Alternative Trading System, FIX Protocol, Foreign Exchange, Institutional Investing, Market Infrastructure

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/onechronos/). Scores are computed from the provider's own public artifacts under a published rubric.