CrabTalk vs Agent37.
Persistent sandboxes + ready-to-run agents
Agent37 hosts existing agent harnesses and custom programs in persistent sandboxes. CrabTalk provides shared tool services with their own SQLite state and per-call budgets; the agent runs in your chosen environment.
Which fits your work?
CrabTalk
- Calling an existing service or deploying a private template
- SQL records and tool access shared across agents and applications
- Small operations with explicit CPU, memory and row budgets
Agent37
- Hosting Hermes, Claude Code or another existing harness
- Browser work, shell commands and installed packages
- A persistent workspace with low allocated-resource rates
Use both.
An agent hosted on Agent37 can call an available CrabTalk service over MCP or HTTP for an integration or shared records. Keep files in the sandbox when that already meets the task; use a shared service when other callers need its tools and data.
Capabilities side by side.
| Capability | CrabTalk | Agent37 |
|---|---|---|
| Execution unit | A defined Rust/Wasm tool call | Programs or agent harnesses in a persistent sandbox |
| Existing capabilities | Call services or deploy published templates | Agent templates and managed app integrations |
| Persistent data | SQLite and values by key per service | Sandbox files, backups and forks |
| Client access | Shared MCP discovery, HTTP and CLI calls | Sandbox REST API and template-provided Agent API |
| Memory scope | Budget held by each call, up to 128 MiB | Selected instance shape, starting at 4 GB |
| Between requests | Guest memory ends with the call; service data remains | Compute bills while awake; optional auto-sleep releases it |
| Full Linux workloads | Host APIs rather than arbitrary system processes | Shell and packages; VM type for a separate kernel |
Collect findings and review them later.
A researcher wants an assistant to retain evidence for later review. Choose where the agent runs and which callers need the records.
CrabTalk
- Call an available memory service or deploy a suitable template
- Connect the research and review agents to the shared MCP endpoint
- Save and query findings through the same service
Agent37
- Create an existing agent template with persistent disk
- Configure its model access and available integrations
- Run research and review through its Agent API, retaining files in the instance
CrabTalk vs Agent37 pricing.
CrabTalk
Owners pay runs, active CPU, memory held during calls and database rows, with paid-plan allowances before overages. Calling a priced service can add its published tool price.
Agent37
Standard rates are $0.80/vCPU, $0.70/GB RAM and $0.09/GB disk per 730-hour month, metered by the minute. A 2 vCPU / 4 GB / 4 GB instance costs $4.76 for 730 running hours; models and managed tools are separate.
With zero idle between calls, 30 seconds waiting, 5 ms CPU, 10 reads and one write, a million calls estimate $1.98 on CrabTalk at 2 MiB, $47.35 at 128 MiB, and $50.24 on Agent37. The calculator includes awake idle time with auto-sleep off. Plans, retained disk and startup are excluded; concurrency can reduce sandbox costs.
Limits that affect the choice.
- CrabTalk tools have at most 100 ms CPU and 128 MiB memory, with a 60-second call-chain deadline. General shell sessions and agent harnesses need another execution environment.
- Agent37's default instances share hardware and sustained CPU may be limited under contention. Performance reserves cores at 4× standard compute; a full VM provides its own kernel at 2.5×.
- Agent37 starts at 2 vCPU / 4 GB, with a documented ceiling of 4 vCPU and 32 GB. Capacity and funded-workspace requirements affect the available shapes.
- Agent37 auto-sleep is opt-in and retains disk charges. Checkpoints can restore memory, but a rebuild preserves files rather than running processes.
Questions about CrabTalk and Agent37.
Do I need to build an agent or connector before using either?
No. Agent37 offers preconfigured harnesses and integrations. CrabTalk lets an existing agent call available services or deploy published templates; custom code is needed only when the desired capability is missing.
Does Agent37 need a new sandbox for every tool call?
No. An existing instance can serve repeated requests and retain its files. The calculator reuses one instance across calls, billing the selected idle gaps while it stays awake, with total uptime rounded to minutes. Optional auto-sleep can lower awake time; it is off in this estimate.
Do long waits guarantee a lower CrabTalk bill?
No. Memory per call, overlapping requests, idle intervals and database work all matter. The serial calculator example is a resource-cost estimate, not a throughput benchmark or a complete production bill.
Sources.
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