CASP Best Execution Obligations — MiCA Compliance Guide

Best-execution in crypto-asset markets — why it’s harder than MiFID

MiCA’s best execution framework adapts MiFID II Article 27 best-execution obligations into the crypto-asset context. The core rule is structurally similar — take all reasonable steps to obtain the best possible result for clients across multi-factor execution considerations. But the operational reality in crypto markets is materially harder than the MiFID equivalent.

MiFID best-execution context: standardised market-data infrastructure, defined trading venues with public order books, consolidated tape arrangements, well-established execution-quality benchmarks. Best-execution analysis runs against meaningfully-standardised market-data infrastructure.

MiCA crypto best-execution context: market-data fragmentation across hundreds of venues, varying quality of market-data feeds, no consolidated tape, substantial cross-venue price differentials, less-mature execution-quality benchmarking infrastructure. Best-execution analysis is operationally more difficult and infrastructure-intensive than MiFID.

The result: The best execution framework imposes core obligations on crypto CASPs that historically operated under more principle-based price-discovery frameworks. The compliance build is real.

The multi-factor best-execution test

The best execution framework explicitly requires consideration of multiple factors, not just price:

Price — the executed price relative to contemporaneous venue benchmarks. Key but not sole.

Costs — explicit costs (commissions, fees) plus implicit costs (spread, market impact). Net price after costs often differs materially from gross price.

Speed — execution timing matters especially in volatile crypto markets. Slow execution at a slightly better price may produce worse net result if price moves during execution latency.

Likelihood of execution and settlement — venue reliability matters. A venue offering better headline price but with execution failure risk or settlement uncertainty may not be best execution.

Size — for large orders, venue depth and market-impact considerations dominate price. Smaller venues may offer better headline prices but cannot absorb large orders without substantial market impact.

Nature of the order — limit orders, market orders, stop orders have different execution characteristics that interact with venue selection.

Other relevant considerations — counterparty risk profile, regulatory standing of execution venue, AML/sanctions screening at execution venue, operational interoperability with operator’s infrastructure.

The the best execution framework expectation: documented framework for how the operator weights these factors for different client types, order types, and crypto-asset classes. Not a single best-execution rule but a calibrated multi-factor analysis.

Execution policy — what it must contain

The the best execution framework execution policy is the documented framework. ESMA Technical Standards specify detailed content:

Identification of relevant execution venues — venues the operator considers for client-order routing. Must include the operator’s own trading platform if it operates one, plus external venues used.

Factor weighting framework — how the operator weights price, costs, speed, etc., for different scenarios. May differ by client type (retail vs professional), order type (small market vs large limit), crypto-asset class (BTC/ETH vs long-tail tokens).

Venue selection process — the operational logic that translates client orders into venue routing decisions. Automated or human-discretionary, with the supporting reasoning documented.

Conflicts disclosure — where the operator routes to its own platform or affiliated venue, the conflict and how it’s managed (often through evidence that own-platform routing produces best execution rather than commercial preference).

Client disclosure framework — how the operator communicates execution-policy summary to clients before service, allowing informed consent.

Review and update mechanism — annual minimum review, more frequent if material changes occur in operator infrastructure or market structure.

Monitoring infrastructure

The best execution framework monitoring is substantive and infrastructure-intensive:

Transaction-level execution analysis — every executed transaction reviewed against contemporaneous venue benchmarks. Where was the best price available at execution time? What did the operator achieve? What was the slippage?

Cross-venue benchmarking — execution quality compared across the relevant venue set. For multi-venue-access operators, ongoing comparison of execution quality at each venue.

Slippage and market-impact analysis — for large orders, analysis of price movement during execution and operator’s market-impact contribution.

Settlement-quality monitoring — execution-to-settlement success rates, settlement-timing analysis, failure-rate tracking.

Periodic execution-policy effectiveness review — thorough analysis of whether the execution policy is producing best results. Quarterly internal review typical, annual external review where appropriate.

Implementation cost — substantive best-execution monitoring infrastructure for a mid-tier CASP typically EUR 150-400k for build plus EUR 50-150k annual operational cost.

Annual disclosure obligations

The framework requires substantive annual disclosure:

Top-five execution venues — by trading volume per crypto-asset class. For each, the percentage of total executed volume that went to that venue. Substantive transparency on routing patterns.

Execution-quality summary — operator’s conclusion on whether execution arrangements produced best results during the reporting period. Substantive narrative, not just data tables.

Material changes — disclosure of substantial changes to execution-venue selection or factor-weighting framework during the period.

The disclosure is published in the CASP’s annual transparency report and submitted to the home-state NCA. The disclosure interacts with broader Article 88 (under Title VI) market transparency obligations for trading platforms.

Multi-venue access — the operational question

The single biggest operational question is whether the CASP has reasonable access to multiple execution venues for the relevant crypto-assets.

For CASPs operating a trading platform plus client-order-execution service: typically routes client orders through own platform by default. The framework requires careful consideration of whether external venue routing would produce better results for some orders or some assets. The conflict question is real.

For CASPs providing execution without own trading platform: typically have access to multiple external venues. The framework requires documented framework for venue selection and ongoing execution-quality monitoring across the venue set.

For CASPs with limited venue access: the obligation still applies. Limited venue access doesn’t reduce best-execution duty — operators must document why limited access is acceptable for the client base and crypto-assets served, and must reasonably consider expanding venue access where it would improve execution quality.

ESMA has signalled that operators with single-venue routing arrangements face heightened supervisory engagement to demonstrate the routing produces best results — not just convenient operations.

Operational deployment for new CASPs

For new CASP applicants providing Class 2 execution services:

Phase 1 — Execution policy drafting (4-8 weeks): comprehensive document with substantive factor-weighting framework.

Phase 2 — Monitoring infrastructure build (4-6 months): transaction-level analysis systems, cross-venue benchmarking infrastructure, slippage analysis.

Phase 3 — Client disclosure integration (2-4 weeks): execution-policy summary integrated into client onboarding flow.

Phase 4 — Annual disclosure infrastructure (4-6 weeks): data aggregation and reporting infrastructure for the annual transparency disclosure.

Phase 5 — Supervisory review (4-8 weeks): NCA engagement on execution-policy adequacy before authorisation grant.

Realistic total: 6-9 months from initial design to operational readiness. Real infrastructure build, particularly the monitoring component.

For CASPs upgrading existing crypto-exchange operations to MiCA compliance, the monitoring build is often the single largest infrastructure investment in the compliance programme — exceeding even the Article 68 record-keeping infrastructure cost in many cases.