Open-source API mock server for multiple protocols
WebAssembly sandbox for running untrusted Python safely
Stage
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Founded
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Based in
US
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Pricing model
Freemium
Open source
Pricing
Free: $0/month with 10,000 requests/month and local mocks only. Pro: $29/month with 250,000 requests/month, 100,000 platform AI tokens/month, and 3 hosted mocks. Team: $99/month with 1,000,000 requests/month, 1,000,000 platform AI tokens/month, and unlimited hosted mocks. Annual plans include 2 mont
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Key features
Multi-protocol support (REST, gRPC, GraphQL, WebSocket, Kafka, MQTT and more)
Realistic data synthesis with template tokens and faker fields
Latency and fault injection for testing retries and fallbacks
Record and replay for capturing and replaying live traffic
Modern admin UI for managing servers, overrides and metrics
Configuration as code with OpenAPI specs and YAML
Local-first development without account requirement
CI integration with local endpoints
HTTP bridge exposing gRPC services over REST
BYOK AI integration with user provider keys
Full CPython 3.14 with standard library
Async callbacks from sandboxed code
No filesystem or network unless allowed
Fast startup in 1–5 milliseconds
Embed from Python, JavaScript or Rust
MCP server support
gRPC server deployment
Hosted execution over HTTP and WebSocket
What makes it different
Multi-protocol mocking from one configuration file
Realism-first simulation with data synthesis and failure injection
Open source with permissive MIT or Apache-2.0 licensing
Local-first approach with optional cloud collaboration
MockForge
eryx