Anonymous offshore VPS and dedicated servers in seven jurisdictions — zero personal data, 16-char token auth, 14 crypto rails (BTC, XMR, USDC) and a public agent-purchasable API (MCP, REST, x402-light) for AI clients.
Pros and cons +6 −4
- ✓ Seed-phrase auth — no email, no password, no phone, no ID at the service layer
- ✓ Per-OTP billing with automatic refund when the SMS fails to deliver
- ✓ 190+ countries, 1,000+ destination services, transparent USD-rated pricing
- ✓ Fourteen crypto rails accepted at checkout, including Bitcoin and Monero
- ✓ Public agent-purchasable API (MCP server, REST + OpenAPI) for AI clients
- ✓ Long-term rental (7/14/30/90 days) with unlimited incoming SMS per window
- ✕ Closed-source backend, no published audit, no transparency report yet
- ✕ USDT only on ERC-20; no TRC-20, BEP-20 or SPL; no Lightning on BTC
- ✕ Mandatory $75 first-load before any number can be purchased
- ✕ Custodial balance model: deposit first, OTPs debit from stored credit
Quick facts
At a glance 7/7
✓
Bitcoin (BTC)
✓
Accepts Monero (XMR)
✓
No signup required
✓
Web app
✓
Instant
✓
Available worldwide
✓
Custodial
Full review
SimSMS is a virtual phone-number service with an unusual authentication model: there is no signup. The server generates a 16-character seed phrase and that seed is your account — no email, no password, no username. Write the seed down or lose access; there is no recovery flow.
How it works
Funding happens in crypto. Fourteen rails clear at the swap layer (BTC, XMR, ETH, USDT, USDC, XRP, LTC, SOL, TRX, TON, DOGE, POL, BCH, DASH), settled to the operator through FixedFloat. The first deposit clears at a $75 minimum — not a fee, but a balance load that sits on the account and pays for SMS as you consume them (typical price $0.20-$1 per OTP). Subsequent top-ups can be as low as $1.
Two modes are supported. Per-OTP delivers a single SMS within a twenty-minute validity window and auto-refunds if no message arrives. Number rental provides a dedicated number for 7, 14, 30 or 90 days that receives unlimited incoming SMS for the entire window — ideal for accounts an agent intends to keep using (Telegram, WhatsApp, recovery numbers, multi-factor auth).
A public Agent API extends the same posture to AI clients. An MCP server at /mcp, a REST surface at /api/v1/ documented by an OpenAPI 3.1 spec, and a /.well-known/agent.json discovery file let Claude, Cursor, Continue, OpenClaw or curl discover services, top up balance, buy verifications and retrieve SMS codes end-to-end without a human in the loop.
KYC & privacy
SimSMS collects no personal data at signup — no email, no government ID, no phone number of your own, not even a chosen username. The seed is the only identifier. Crypto payments are pseudonymous; FixedFloat issues per-invoice deposit addresses so on-chain heuristics see one-shot wallets, not a stable customer ledger. The metadata the service inherently keeps (which numbers were rented, from which carriers, for how long) is bound to the seed, not to a person.
Strengths and limits
The strengths are structural. The seed-phrase model means a coerced disclosure returns a hash and a wallet address — neither unmasks the user. The catalogue is wide (190+ countries, 1,000+ destination services), the pricing page is plain, and the auto-refund on failed delivery is the honest behaviour most competitors promise and few actually ship. Limits are real: short service history, closed-source backend, no audit; the mandatory $75 first-load is high for users who need a single OTP and will not return; USDT only on ERC-20; no Lightning. Carrier blocks remain the main failure mode — most failed OTPs are upstream refusals from the target service, which SimSMS cannot control.
Verdict
SimSMS is the cheapest honest way to put a phone number into a signup form that insists on one — for users willing to manage a seed phrase, settle in crypto and load a starting balance. The new agent-purchasable API extends the same posture to autonomous clients. Score 9.6 / 10, KYC tier anonymous.
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XmrBazaar
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