Checked 8 Sep 2026
Solvr vs NSLSolver
A broad multi-vendor solver, compared with one that covers fewer walls and shows its working.
NSLSolver covers Turnstile, Cloudflare Challenge, Kasada, reCAPTCHA and Akamai behind one endpoint, and lists Kasada at $1.50 per 1,000. We are $2.00 per 1,000 on Kasada and cover Kasada and DataDome, each priced per surface. What the extra fifty cents buys: a sync and async API rather than one shape, the Kasada grade returned on every bundle so our success claim is checkable against your own accept rate, concurrency tiers instead of rate limits, signed webhooks, an MCP server, and a ledger row per solve you can export.
$5 minimum no subscription failed solves cost nothing
At a glance
Solvr
NSLSolver
- per 1,000
- $2.00 $1.50
- Vendors covered
- Kasada and DataDome five
- Failed solves
- never billed not billed
- API shapes
- sync + async sync
- Grade returned
- yes no
- Free to try
- no 100 requests
compiled from nslsolver.com on 8 Sep 2026 · ours read live from this app
They are the better choice sometimes.
no vendor wins every row
Pick NSLSolver if
- You need Turnstile, reCAPTCHA or Cloudflare Challenge as well as Kasada, and would rather hold one account than three.
- Kasada list price is the deciding number and $0.50 per 1,000 is material at your volume.
- You want to try it without a card — they offer 100 free requests on email verification.
- You want a published SDK for your language on day one rather than writing the client yourself.
Pick Solvr if
- You are stuck on Kasada or DataDome and want the vendor with fewer walls to watch — each priced per surface, the grade back on every solve, failures never billed.
- You need to prove the success rate to someone. We return Kasada’s own grade (
r) and the script generation with every bundle. - You are running this in production: async submit plus signed webhooks, typed error kinds you can branch on, and concurrency that scales with spend.
- An agent is doing the work. Our MCP server is the same key, the same price and the same rules.
Row by row
Solvr vs NSLSolver, row by row.
Anything we could not verify from a public page reads not published rather than a guess. If you work at NSLSolver and a row is wrong, tell us and we will fix it.
four groups · their side from their site
| Capability | Solvr | NSLSolver |
|---|---|---|
| Billing | ||
| Kasada, per 1,000 List price. Ours is higher and we are not going to hide that behind a table. | $2.00 | $1.50 |
| Failed solves Both sides say failures are free. Ours is mechanical: successes and failures are metered on separate counters, so there is no charge to reverse. | never billed | not billed |
| What counts as a success A weak Kasada verdict is refused upstream here and never becomes a billable bundle. | strong grade only | not stated |
| Price on the public site Neither of us makes you book a call to learn a number. That is rarer in this market than it should be. | yes | yes |
| Ledger you can export Target, outcome, latency, grade and exact cost on every row. | per solve, CSV | not published |
| Minimum top-up | $5 | $10 |
| Volume bonus | tiered on deposit | up to 12% over $25 |
| Coverage | ||
| Kasada | yes | yes |
| DataDome Not on their vendor list on the date checked. | yes | not listed |
| Cloudflare Turnstile Straightforwardly theirs. Listed at $0.40 per 1,000. | no | yes |
| Cloudflare Challenge Also theirs, at $0.50 per 1,000. | no | yes |
| reCAPTCHA v3 / Enterprise | no | yes |
| Akamai Bot Manager | no | beta |
| Proof-of-work (cd) endpoint Kasada wants a fresh cd per request. Charging for that would be charging you for integrating correctly. | free, unlimited | not published |
| API | ||
| Full-network solve We drive the whole chain through your proxy. Submit and collect — deliberately not synchronous, because five of those six seconds are your proxy, and a held connection turns one slow exit into everyone's problem. | POST /api/tasks | POST /solve |
| Solve-only, in one call You own every network hop, we run the script: ~200ms, no proxy field, answer in the first response. Half the price of a full solve because it costs us a fraction as much. | POST /api/kasada/payload | not published |
| Signed webhooks Signed over the raw body with the timestamp inside the signed string, so a captured delivery cannot be replayed. | HMAC · 5 retries | not published |
| Grade returned to you The difference between a success rate you are told and one you can measure. | r + script version | not returned |
| Typed error kinds bad_fingerprint, upstream_timeout, rejected, busy — branch on the kind instead of parsing a message. | yes | not published |
| Bring your own proxy Never written to disk. Debug records keep scheme, host and port and drop the credentials. | per request | not published |
| MCP server Claude Code, Cursor, Codex and anything else speaking the protocol. | yes | no |
| SDKs Theirs. It is a POST with a JSON body either way, but an SDK saves you an afternoon. | curl and MCP | published on GitHub |
| Operations | ||
| Limit model Requests per minute is the wrong unit for something that takes five seconds. You are limited on how many run at once. | concurrency tiers | not published |
| Tier movement Rolling, so nobody is demoted at midnight on the 1st mid-workload. | rolling spend window | not published |
| Published latency Not comparable — different walls. A Kasada solve is not a Turnstile solve, and anyone setting those two numbers side by side is selling something. | median 5–6s · 45s deadline | ~250ms on Turnstile |
| Token retention Bundles are IP-bound, single-use and live for minutes. Holding short-lived credentials longer is liability with no upside. | stripped within hours | not published |
| Payment methods They take USDT, USDC, ETH, BTC, LTC, TRX and SOL. We take those plus Visa, Mastercard and Amex. | card and crypto | crypto only |
| Free trial credit Theirs, and it is a genuinely good on-ramp. | no | 100 requests |
| Support | Telegram and email | Telegram and Discord |
- ok
- better here
- bad
- worse here
- warn
- partial, gated or caveated
- neutral
- a fact, not a score
Cost
What the workload costs.
Successful solves only, on both sides. Neither of us bills a failure, so these are close to the real numbers rather than the sticker ones.
Their published Kasada rate. Turnstile is $0.40 and Cloudflare Challenge $0.50 per 1,000 on their pricing — cheaper walls, cheaper solves.
$0.00
per proof-of-work, here.
Kasada wants a fresh cd on every
request, so a crawl needs one per page rather than one per solve. Whatever a vendor
charges for that is the line item that scales with your traffic — do the arithmetic
on it before comparing headline rates.
| Successful solves | Solvr | NSLSolver | Difference |
|---|---|---|---|
| 1,000 | $2.00 | $1.50 | +$0.50 |
| 10,000 | $20.00 | $15.00 | +$5.00 |
| 100,000 | $200.00 | $150.00 | +$50.00 |
| 1,000,000 | $2,000.00 | $1,500.00 | +$500.00 |
minimum top-up · Solvr $5 · NSLSolver $10 their deposit bonus · up to 12% over $25
The differences that don't fit in a cell.
- a deliberate narrowing Fewer walls, not five
- NSLSolver spans Turnstile, Cloudflare Challenge, Kasada, reCAPTCHA and Akamai. We ship Kasada and DataDome, each priced per surface on the pricing page. Breadth is a real feature, and if you need four walls solved they are the shorter path. It is also a real cost: Kasada ships new script generations without warning, and the team with fewer walls to watch is the team watching yours that day.
- r returned on every bundle A success rate you can audit
- Every solver on this market claims something in the high nineties. We hand back Kasada’s own grading verdict and the script generation with each bundle, so you can correlate our output against your downstream accept rate instead of taking a landing page at face value. It costs us nothing to be checkable, which is why it is suspicious that it is rare.
- sync and async Two shapes, one API
- Hold the connection and take the bundle in the response, or submit and let a signed webhook bring it to you. Same auth, same price, same error taxonomy. A single synchronous endpoint is fine until you are running ten thousand of them and every one holds a socket open for five seconds.
- not requests per minute Limited on what runs at once
- A solve takes seconds, so RPM is the wrong unit — it either throttles you while your engines sit idle or lets you open more sessions than your proxies can carry. You get a concurrency ceiling matched to spend over a rolling window, and rolling means no cliff on the 1st.
- $0.00 per cd The proof-of-work is free
- Kasada demands a fresh cd on every single request, so ten thousand pages is ten thousand of them. We mint them and charge nothing. Metering that would be putting a price on doing the integration properly.
- MCP · same key Your agent can call it directly
- We run a remote Model Context Protocol server. An agent that hits a Kasada wall mid-task calls solve and carries on, rather than handing you a screenshot of a challenge page. Same API key, same concurrency, same balance.
Migration
Moving a call across.
Both are a POST with a JSON body and a key in a header. What changes is the shape of the response: you get a token bundle plus the grade that produced it.
Full API reference →$ curl -X POST https://api.nslsolver.com/solve \
-H "Authorization: <key>" \
-d '{"type":"kasada","url":"https://www.example.com/"}'
200 {
"success": true,
"token": "…",
"solve_time_ms": 4820
}$ curl -X POST app.getsolvr.io/api/tasks \
-H "X-API-Key: solv_live_…" \
-d '{"target":"https://www.example.com/","proxy":"…"}'
202 { "task_id": "3f6a…" }
$ curl app.getsolvr.io/api/tasks/3f6a… # or take a webhook
200 {
"status": "success",
"solution": {
"ct": "eyJ0IjoiZncifQ…",
"r": "1-B", // the grade, returned
"version": "p-2.7.1"
}
}Questions
NSLSolver, asked and answered.
Including the ones where the answer is not the one we would have chosen.
Is Solvr or NSLSolver cheaper for Kasada?
NSLSolver, on list price. They publish $1.50 per 1,000 Kasada solves against our $2.00. Neither of us bills a failure, so the list price is close to the real one on both sides. The question worth asking is what a solve is worth to you: we refuse weak-grade sessions upstream rather than billing them, and we return the grade so you can check that we do.
Does NSLSolver charge for failed solves?
No — their site states failed solves are always free, and neither do we. The difference is mechanical rather than commercial: we meter successes and failures on separate counters, so a failure never reaches your balance and there is no refund to chase and no window to wait out.
Which anti-bot vendors does each one cover?
NSLSolver lists Cloudflare Turnstile, Cloudflare Challenge, Kasada, reCAPTCHA v3 and Enterprise, and Akamai Bot Manager in beta. We cover Kasada and DataDome, each priced per surface. If your blockers go past those, that breadth is a real reason to pick them.
Can I run both?
Plenty of people do, and it is the sensible thing while you are evaluating. Both are prepaid with no subscription, so putting the same workload through each for a week costs you the solves and nothing else. Compare accept rates downstream rather than the numbers on either landing page.
How do I switch?
Change the URL, the header and the field name, then read the bundle out of solution instead of token. Everything else — proxies, retries, your own queueing — stays where it is. There is a worked example further down and the full reference is public.
Other comparisons
Sources
NSLSolver figures compiled from nslsolver.com and its public documentation on 8 Sep 2026. Ours are read out of this application at render time. NSLSolver is not affiliated with Solvr, and the name is used only to identify their product.