Introduction
Every Grok 4.5 project begins the same way: a developer needs to test the model against a real workload before anyone signs off on a budget. That evaluation window is where onboarding terms outweigh sticker prices. A large trial that expires in seven days rarely survives a corporate procurement cycle. A smaller balance that never expires — and does not require a credit card — usually does.
This ranking compares 10 providers of Grok 4.5 on how they let developers start, spend, and scale without upfront lock-in. Choosing a Grok API for evaluation comes down to a handful of details that pricing pages rarely surface together: credit size, credit expiration, credit-card requirements, minimum top-ups, failed-task billing, and how PAYG behaves once the free balance runs out. The rankings below reflect those details as documented by each platform.
How We Test
Each platform was assessed against onboarding and billing flexibility criteria:
- Free credit size and form: dollar or credit amount granted at signup and whether it applies to Grok 4.5 specifically.
- Credit expiration: whether granted or purchased credits expire and on what schedule.
- Card-free signup: whether an API key can be created without submitting a payment method.
- Minimum top-up: the smallest prepaid amount required after the free tier ends.
- PAYG structure: markups, service fees, or plan requirements attached to pay-as-you-go usage.
- Failed-task policy: whether errored or aborted generations are billed — critical when a trial balance is small.
TL;DR
| Rank | Platform | Free Credits | Credit Expiration | Card-Free Signup | PAYG Terms |
| 1 | ApiPass | 50 credits on signup | Non-expiring | Yes | PAYG, $0 for failed tasks |
| 2 | ZenMux | Trial credits (signup) | PAYG-based | Yes | 5% top-up service-fee discount |
| 3 | Atlas Cloud | Card-free API key | PAYG-based | Yes | No seat fees or monthly minimums |
| 4 | Requesty | Trial credits available | Standard PAYG | Yes | 5% PAYG markup; Enterprise = upstream |
| 5 | Merge | 2,000 free monthly credits on Agent Handler | Monthly reset | Plan-based | Platform plans from $650/mo |
| 6 | EvoLink | Signup credits | Standard PAYG | Yes | $10 minimum top-up |
| 7 | Kie.ai | 80 free credits | Non-expiring | Yes | Failed tasks free; 10% top-up bonus tier |
| 8 | OpenRouter | PAYG credits | Standard PAYG | Yes | Weighted average pricing |
| 9 | Flaq AI | Free-to-try access | PAYG-based | Yes | Pay-per-use, no subscription |
| 10 | Kilo Code | Teams plan 14-day free trial | Subscription-based | Trial | BYOK zero markup; Kilo Pass $19–$199/mo |
Website List
ApiPass
What Is It?
ApiPass exposes Grok 4.5 through the grok-build/grok-4.5 route on a unified gateway. For teams that want to evaluate the model without pre-committing budget, the platform’s onboarding model is the differentiator: signup grants free credits, the credits never expire, no credit card is required, and failed tasks are not billed — so evaluation attempts do not silently consume the trial balance.
Features
- OpenAI-compatible Chat Completions endpoint plus async job architecture with taskId and webhooks.
- 1M-token context window covering long-document evaluation runs.
- Detailed usage logs make it easy to see exactly how the free balance is being spent.
- Prompts and outputs are not stored or used for training.
- 180+ additional models accessible from the same balance.
Pricing
Grok 4.5 costs $1.0001 per 1M input tokens, $3.0003 per 1M output tokens, and $0.250 per 1M cached tokens at or below 200K context. Above 200K, rates step to $2.0002 / $6.001 / $0.500. New accounts receive 50 free credits. Credits are pay-as-you-go and do not expire. Failed tasks are billed at $0.
Pros & Cons
- Pros: Non-expiring credits protect intermittent evaluators. Zero cost on failed tasks means retry loops during prototyping do not burn the trial. Card-free signup eliminates a common approval bottleneck inside companies.
- Cons: The initial 50-credit grant is compact rather than large; heavy stress testing will need a top-up. Async submission requires modest client-side changes for teams migrating from synchronous SDK calls.
Best For
Solo developers, indie teams, and evaluators inside larger companies who want a friction-free trial that survives long procurement cycles.
ZenMux
What Is It?
ZenMux is a unified API platform for more than 100 leading models, offering Grok 4.5 as x-ai/grok-4.5. Its onboarding leans on PAYG flexibility: card-free signup, trial credits at registration, and a top-up service-fee discount that reduces the effective PAYG markup on prepaid balances.
Features
- OpenAI SDK compatibility via ZenMux base URL and API key.
- Model Auto Routing based on quality and cost requirements.
- Cloudflare-backed edge acceleration and provider failover.
- Usage analytics and AI Insurance for quality and latency issues.
- 500K-token context on Grok 4.5.
Pricing
Input pricing ranges from $2 to $4 per 1M tokens; output ranges from $6 to $12 per 1M tokens. Token-level PAYG billing with a 5% top-up service-fee discount. Reported 77.4% cache-hit rate reduces effective spend on repeat prompts.
Pros & Cons
- Pros: Top-up service-fee discount offsets some of the PAYG markup. High cache-hit rate quietly extends whatever balance a team is running. No stated PAYG rate-limit restrictions.
- Cons: Published price ranges require route validation before capacity planning. Documentation navigation is heavier than single-provider APIs.
Best For
Teams that expect steady prepaid top-ups and want to recover part of the platform’s service fee as usage scales.
Atlas Cloud
What Is It?
Atlas Cloud is a production-oriented gateway covering more than 400 curated models. For flexible starts, its onboarding is unusually clean: an API key can be created without a credit card, PAYG has no seat fees, and there are no monthly minimums — so a team can pause between evaluation phases without paying for a dormant seat.
Features
- Full OpenAI SDK compatibility by changing base URL and API key.
- Streaming, batch processing, and structured outputs.
- Playground, CLI tools, MCP Server support, and Atlas Cloud Skills.
- SOC 2 and HIPAA compliance available; private cloud deployment options.
Pricing
Grok 4.5 costs $2 per 1M input tokens and $6 per 1M output tokens. Pay-as-you-go with no seat fees or monthly minimums. Cache-based pricing optimization for repeated context is documented.
Pros & Cons
- Pros: No monthly minimums make paused projects free to hold. Card-free key issuance removes procurement friction. Batch processing lets prototype loads cost less without changing pricing tier.
- Cons: Grok 4.5-specific RPM/TPM limits are not published in supplied material. Enterprise-scale terms may require sales coordination.
Best For
Teams that evaluate models in cycles and need a gateway that does not charge them for idle months between projects.
Requesty
What Is It?
Requesty is an API gateway for more than 665 models across 31+ providers. Its xai/grok-4.5 route pairs trial credits and card-free signup with an unusually explicit PAYG-versus-Enterprise structure: PAYG carries a small markup, and Enterprise plans switch billing to upstream pricing with no markup at all.
Features
- OpenAI SDK compatibility via base URL change.
- Automatic provider failover in under 14ms with nearest-region routing.
- Role-based access controls, SSO, team budgets, and per-key rate limits.
- PII scrubbing, prompt-injection protection, content filtering, and EU data residency.
- 500K-token context, tool calling, structured outputs, extended reasoning, web search.
Pricing
Grok 4.5 costs $2 per 1M input tokens and $6 per 1M output tokens. Cache writes $2 / 1M, cache reads $0.50 / 1M. PAYG adds a 5% markup. Enterprise plans use upstream pricing with no markup. Requests over 200K total tokens are billed at a higher rate. Enterprise SLA is 99.99% uptime.
Pros & Cons
- Pros: Transparent published markup makes budgeting predictable. Enterprise switch to upstream pricing rewards teams that graduate from trial to volume. Governance features come without a separate procurement track.
- Cons: PAYG customers permanently pay a 5% premium unless they upgrade. Cache read pricing at $0.50 / 1M is higher than several competitors. Self-hosting is not offered.
Best For
Teams that expect a clean path from trial → PAYG → Enterprise and want governance features included at every stage.
Merge
What Is It?
Merge provides infrastructure for connecting LLMs, tools, and business-data APIs through one integration layer. Its Gateway includes Grok 4.5 as xai/grok-4.5, and its trial mechanism is different from most on this list: instead of a one-time signup credit, Agent Handler users receive 2,000 free monthly credits that reset — useful for teams whose evaluation stretches across multiple months.
Features
- Gateway routing with automatic fallback when a provider becomes unavailable.
- Agent Handler connects agents to pre-built external tools with scoped permissions and audit trails.
- Real-time call monitoring, health checks, and logs.
- 500K-token context, tool calling, structured outputs, streaming, zero data retention.
- Developer sandboxes and SDKs.
Pricing
Grok 4.5 is listed at $2 per 1M input tokens and $6 per 1M output tokens. Agent Handler includes 2,000 free monthly credits. Unified Launch starts at $650/month; Agent Handler Pro starts at $1,000/month. Rate limits are plan-based: 100/min Launch, 400/min Professional, 600/min Enterprise.
Pros & Cons
- Pros: Monthly-refresh free credits are unusual and extend evaluation beyond a single burst. Health checks and fallback come standard. Scoped permissions and audit trails fit enterprise pilots.
- Cons: Larger workloads require paid platform plans on top of tokens. Advanced support and custom SLAs sit behind Enterprise. Free credits scope to Agent Handler rather than being universal.
Best For
Enterprise pilots that stretch across quarters and benefit from a monthly-reset credit allotment plus governance-grade tooling.
EvoLink
What Is It?
EvoLink is a unified gateway for more than 170 models from 30+ providers. Its onboarding gives signup credits without a credit card, and its top-up structure is simple: prepaid balance with a modest $10 minimum, no subscription plans required to access PAYG rates.
Features
- Compatible with OpenAI, Anthropic, and Google SDKs via base URL and key.
- Smart routing selects fastest or lowest-cost endpoint in real time.
- Automatic failover targets 99.9% uptime.
- Dashboard and model playgrounds for pre-integration testing.
Pricing
Grok 4.5 costs $1.70 per 1M input tokens, $0.256 per 1M cached input tokens, and $5.10 per 1M output tokens under 200K context. Above 200K, rates double. Signup credits available without a credit card. Prepaid top-ups require a $10 minimum.
Pros & Cons
- Pros: Under-200K pricing is 15% below official xAI rate, extending trial mileage. Card-free signup credits are large enough to test routing modes. $10 top-up floor is low relative to enterprise gateways.
- Cons: Long-context requests pay 2× the short-context rate and erode the trial faster. Server-side tools (search, code execution) add per-call fees.
Best For
Individual developers and small teams that want a discounted PAYG rate and a low top-up floor rather than a subscription.
Kie.ai
What Is It?
Kie.ai provides Grok 4.5 through the grok-4-5 identifier. Its trial and PAYG story is credit-based: signup grants 80 non-expiring credits, failed tasks are not charged, and high-tier top-ups add a 10% bonus. Combined, these details make the platform friendly for developers who prototype in bursts.
Features
- Adjustable reasoning effort from Low through Xhigh.
- Function calling, structured outputs, web access, and multi-turn context support.
- Playground, usage logs, webhooks, and direct technical support channels.
- Default submission limit of 20 requests every 10 seconds with no strict concurrency limit on running tasks.
Pricing
Grok 4.5 costs 160 credits per 1M input tokens, 24 credits per 1M cached input tokens, and 480 credits per 1M output tokens — approximately $0.80 input, $0.12 cached input, and $2.40 output per 1M tokens. New users receive 80 free credits. Credits do not expire. High-tier top-ups can add a 10% bonus. Failed tasks are not charged.
Pros & Cons
- Pros: Non-expiring credits combined with free failed tasks make trial spend efficient. Reasoning-effort control lets developers cap per-request cost during testing. Low effective rate stretches the trial balance further.
- Cons: Credit-to-dollar conversion adds a small cognitive step. Platform logs are deleted after two months, which affects longer audit windows.
Best For
Bursty developers and hobbyists who value non-expiring credits and want their trial dollars to survive across intermittent evaluation cycles.
OpenRouter
What Is It?
OpenRouter is a multi-provider AI gateway exposing Grok 4.5 as x-ai/grok-4.5 through an OpenAI-compatible API, routing across 500+ models. Its PAYG model is deliberately flat: credits work across every model in the catalog, so a Grok 4.5 evaluation can seamlessly become an A/B test against alternatives without switching accounts.
Features
- OpenAI-compatible integration.
- Routing modes including Nitro (speed) and Exacto (tool-calling accuracy).
- Custom data policies restrict which providers can receive prompts.
- Playground, usage analytics, and live provider-performance information.
Pricing
Grok 4.5 is listed at $2 per 1M input tokens, $6 per 1M output tokens, and $0.30 per 1M cached input tokens. Credits are pay-as-you-go across all supported models. Weighted average price may vary with cache and routing behavior.
Pros & Cons
- Pros: Cross-model credit portability turns a Grok 4.5 trial into a broader evaluation. Low cache-read pricing stretches trial balances on repeated prompts. Live reliability data reduces guesswork during onboarding.
- Cons: Weighted-average pricing makes strict trial budgeting slightly less predictable. Upstream provider errors can occur before routing recovers.
Best For
Teams that want a single credit balance covering Grok 4.5 plus dozens of alternatives during comparative evaluation.
Flaq AI
What Is It?
Flaq AI is an aggregation and inference platform with unified access to more than 400 models. Its Grok 4.5 route grok-4.5-text-to-text is offered under a straightforward free-to-try model: no mandatory subscription, standard pay-per-use billing, and card-free signup for initial testing.
Features
- Single API key across a curated model library.
- Standard /v1/chat/completions endpoint with Bearer authentication.
- JavaScript, Python, and cURL SDK examples.
- Playground, prompt library, documentation, and agent guides.
Pricing
Grok 4.5 is listed at $1.80 per 1M input tokens and $5.40 per 1M output tokens, described as a 10% discount from referenced original rates. Free-to-try access with pay-per-use billing and no mandatory subscription.
Pros & Cons
- Pros: 10% discount extends any trial balance. No subscription requirement lowers commitment. Simple endpoint pattern shortens time-to-first-token during trial.
- Cons: Specific RPM/TPM limits for Grok 4.5 are not stated in supplied material. Text-to-text route cannot process non-text inputs or perform web searches. Cache-read pricing is not disclosed, making some trial-cost forecasting imprecise.
Best For
Developers who want a low-friction, discounted, text-only PAYG start without navigating a subscription page.
Kilo Code
What Is It?
Kilo Code is an agent-focused development platform and gateway offering x-ai/grok-4.5 at provider rates. Its trial mechanism is different: rather than a one-time credit grant, the Teams plan includes a 14-day free trial, and separately, BYOK usage carries no platform markup — so teams that already hold provider keys can effectively “try” the platform at zero platform cost.
Features
- OpenAI-compatible endpoints for hosted and locally connected workflows.
- Managed, BYOK, and local runtime options can coexist.
- Auto Model routing with Frontier, Efficient, or Free strategies.
- Agent workflows across VS Code, JetBrains, CLI, and cloud environments.
- 500K-token context with function calling, tool choice, structured outputs, and reasoning tokens.
Pricing
Grok 4.5 costs $2 per 1M input tokens, $6 per 1M output tokens, and $0.30 per 1M cache-read tokens. BYOK usage has no platform markup. Kilo Pass subscriptions range from $19 to $199 per month. The Teams plan includes a 14-day free trial.
Pros & Cons
- Pros: BYOK path removes platform markup entirely for teams with existing provider access. Teams plan trial is time-boxed but generous in feature access. Local runtime option can be part of the free-tier stack.
- Cons: Beyond BYOK, ongoing use expects a Kilo Pass subscription. Trial is time-based rather than credit-based, so intermittent evaluators may run out of clock before spend.
Best For
Development teams that already hold Grok API access and want to trial an agent workflow layer with zero platform markup during evaluation.
Key Takeaways
- Credit expiration matters more than credit size. Non-expiring balances on ApiPass and Kie.ai often deliver more usable evaluation time than a larger balance on a 30-day clock.
- Failed-task billing is a hidden trial-killer. ApiPass and Kie.ai explicitly do not charge for failed tasks, protecting balances during error-heavy prototyping.
- Card-free signup is the biggest procurement unlock. ApiPass, ZenMux, Atlas Cloud, Requesty, EvoLink, Kie.ai, OpenRouter, and Flaq AI all issue API keys without a payment method.
- PAYG markups differ meaningfully. Requesty publishes a 5% PAYG premium; ZenMux offers a top-up service-fee discount; Enterprise on Requesty removes the markup entirely.
- Two trial models exist. Most platforms grant one-time credits; Merge grants monthly-reset credits; Kilo Code offers a time-boxed 14-day trial. Match the model to how evaluation actually happens on the team.
Conclusion
Free credits and PAYG terms only look interchangeable in pricing-page copy. In practice, they map onto very different evaluation styles.
For short, focused trials that need to move fast without finance approval, prioritize card-free signup and non-expiring credits — ApiPass, Kie.ai, and Atlas Cloud fit this pattern. For multi-month enterprise pilots, monthly-refresh mechanisms such as Merge’s Agent Handler credits keep evaluation funded across quarters. For teams that already hold provider keys, Kilo Code’s BYOK path avoids paying any platform markup during trial. For comparative benchmarking across many models, OpenRouter’s cross-model credit portability turns one trial balance into a broad A/B test.
The right choice is the one whose trial and PAYG structure matches the actual pace and shape of the evaluation, not the platform advertising the largest credit number.
