Changelly

What it is. Changelly is a custodial instant-swap service operating since 2015 — one of the oldest names in the category. 300+ assets across many chains, Monero included; you can swap crypto-to-crypto without an account or email (pick the pair, choose a floating or fixed rate, give a receive address, and send to a one-time deposit address). Fiat purchases are routed through licensed third-party providers who KYC you themselves.

The rate. Changelly earns from the spread baked into the quoted rate rather than a visible line-item fee. The number you see is what you get, but the margin is not itemized against the mid-market rate — cross-check a quote elsewhere for a large swap.

The risk that defines the grade — AML holds. Changelly runs a full AML/KYC program, and its own policy is explicit: when its risk engine flags a transaction as suspicious, *"the transaction will be put on hold"* and the service collects identity documents before releasing funds. This is the shotgun-KYC pattern — marketed as no-signup, but the operator reserves the right to demand ID, usually after your deposit has already landed, when the internal risk score trips. It also screens against sanctions / SDN lists and geoblocks restricted regions. Changelly is one of the most-reported services in the category for exactly this: funds held pending verification, sometimes for extended periods.

What this means for you. Most swaps clear untouched. But the risk engine fires unpredictably — large amounts, certain chains, certain addresses or IPs — and when it fires, your funds are already custodial and can be frozen until you verify or the case resolves. That is categorically different from a structurally non-custodial atomic swap, where no engine can pause a trade because no operator holds the funds. Read the current refund / hold terms before depositing, and never route funds you cannot afford to have held.

Useful when. You want deep liquidity and broad asset coverage from a long-established operator, your funds are clean and unremarkable, and you accept the custodial-hold risk as the price of convenience. For anything privacy-sensitive or time-critical, a non-custodial atomic swap or a P2P venue is the safer shape.

Caveats & grade. C-: eleven years of tenure and published Terms / Privacy / AML policies are real positives that keep it a legitimate listing — but the custodial hold-pending-KYC behaviour is a documented, recurring, above-average reader hazard, which pulls it below the C midpoint. It is listed because it works and it is honest about being AML-bound; it is graded low because it works right up until the risk engine decides it does not. Clean funds are usually fine; a complicated history is not.