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Settlens vs Syrin - Static Contract Analysis for MCP Servers
Analyzes MCP server contracts for failures, focusing on contract correctness rather than payment policy compliance.
SettlensCatch x402 payment-policy regressions before paying
Syrin - Static Contract Analysis for MCP ServersCatch MCP failures before the agent doesWhich to pick
Pick Settlens if you want…
- Policy-driven preflight checks for x402 payments
- Integrations with Node.js, HTTP API or MCP server (on Settlens' list, not Syrin - Static Contract Analysis for MCP Servers')
Pick Syrin - Static Contract Analysis for MCP Servers if you want…
- Budget-controlled, safe multi-agent AI systems
- Static MCP contract analysis
- Integrations with OpenAI, Anthropic or Google (on Syrin - Static Contract Analysis for MCP Servers' list, not Settlens')
Side by side
- What it is
- Settlens:Settlens validates x402 payment requests against policies, providing pre-payment decisions without sending funds.
- Syrin - Static Contract Analysis for MCP Servers:Syrin is a Python library that adds budget enforcement, memory management, sandboxed code execution and guardrails to LLM agents.
- Best for
- Settlens:Policy-driven preflight checks for x402 payments
- Syrin - Static Contract Analysis for MCP Servers:Budget-controlled, safe multi-agent AI systems
- Who it’s for
- Settlens:Teams building or operating x402-based paid APIs and AI agents that need payment safety checks.
- Syrin - Static Contract Analysis for MCP Servers:Python developers building production AI agents.
- Pricing
- Settlens:Contact sales
- Syrin - Static Contract Analysis for MCP Servers:Open source
- Open source
- Settlens:Yes, 0 GitHub stars
- Syrin - Static Contract Analysis for MCP Servers:Yes, 48 GitHub stars
- Works with
- Settlens:Node.js, HTTP API, MCP server
- Syrin - Static Contract Analysis for MCP Servers:OpenAI, Anthropic, Google, Ollama, Datadog, PagerDuty
Settlens features
- Passive endpoint scan. Scans 402 handshakes and payment requirements without making any payment.
- CI gate integration. Fails pull-request jobs based on configurable severity thresholds via a GitHub Action.
- Monitoring & regression detection. Compares scans to baselines, alerts on drifts and regressions, and can post webhooks.
- Signed evidence attestation. Attests reports with an ed25519 signature and timestamp for offline verification.
- Offline signature verification. Verifies EVM and Solana payment signatures without needing RPC calls.
- MCP preflight API. Agents call evaluate_payment_requirements to get pay, review or do_not_pay decisions.
Syrin - Static Contract Analysis for MCP Servers features
- First-class budget enforcement. Set dollar limits per agent; stop, warn or switch models when the budget is exceeded.
- Budget-aware persistent memory. Four memory types with decay, import-rank and token-cost awareness, persisting across sessions.
- Isolated sandbox execution. Run LLM-generated Python, Bash or JavaScript in subprocesses with timeouts and no shared state.
- 72+ lifecycle hooks. Typed events fire on every LLM request, tool call, memory read, sandbox exec, etc., for observability.
- Built-in guardrails. PII redaction, prompt-injection detection, content filtering, fact verification and output length limits.
- Multi-agent orchestration. Swarm topologies and recursive sub-agent spawning share budget, memory and observability.
- Agent identity & signing. Each agent has a cryptographic Ed25519 identity; messages are signed to prevent impersonation.
- Token-Oriented Object Notation (TOON). Compact schema format reduces token usage on tool calls by ~40%.
Settlens vs Syrin - Static Contract Analysis for MCP Servers FAQ
Is Settlens or Syrin - Static Contract Analysis for MCP Servers free?+
Syrin - Static Contract Analysis for MCP Servers is free and open source.
Is Settlens or Syrin - Static Contract Analysis for MCP Servers open source?+
Yes, both are open source: Settlens (Pazificateur69/settlens on GitHub) and Syrin - Static Contract Analysis for MCP Servers (syrin-labs/cli on GitHub, ISC license).
Do Settlens and Syrin - Static Contract Analysis for MCP Servers integrate with the same tools?+
Their integration lists don't overlap: Settlens lists Node.js, HTTP API and MCP server; Syrin - Static Contract Analysis for MCP Servers lists OpenAI, Anthropic, Google, Ollama and 2 more.
On DevHunt
Syrin - Static Contract Analysis for MCP Servers
24 upvotes · Launched on DevHunt on Feb 3, 2026
Based on each tool's website and DevHunt data. Details may change; check the official sites.