generated: '2026-07-18'
method: searched
source: https://coasty.ai/api/discovery
docs: https://coasty.ai/docs
summary: >-
  Coasty ships a free sandbox on the same host and same schemas as production,
  gated purely by the API key prefix. Sandbox keys bill zero credits and return
  mock VMs in under 50ms, making them safe for CI/CD.
test_vs_live:
  mechanism: key-prefix
  live_key_prefix: sk-coasty-live-
  test_key_prefix: sk-coasty-test-
  same_host: https://coasty.ai
  schema_parity: identical validation and response contracts
sandbox_keys:
  cost: free — billed at 0 credits
  mock_vm_latency_ms: 50
  semantics: provider/model side effects are sandboxed or mocked
  response_headers:
  - 'X-Credits-Charged: 0'
  - 'X-Coasty-Test-Mode: true'
  - 'X-Coasty-Key-Kind: test'
  limitations:
  - Stored BYOK LLM key management (PUT /v1/llm/keys/{provider}) is live-only.
isolation:
  model: per-session VM-level isolation (not shared containers)
notes:
- No published magic test card numbers or fixture identifiers — this is an
  agent/compute API, not a payments API; the sandbox mocks VMs and model calls.