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Head to head · Diagram create · October 2026 research run

Eraser API + MCP vs Lucid API + MCP

Lucid API + MCP has a score of 60.9 (C) against Eraser API + MCP's 38.7 (E). Both do diagram create. The largest gap is reliability, 52 points.

Eraser API + MCPEraser · HTTP API E38.7/100#427 of 452 Lucid API + MCPLucid Software · HTTP API C60.9/100#238 of 452

Which one, for what

Pick Eraser API + MCP for

  • payments & pricing (+10)

Pick Lucid API + MCP for

  • reliability (+52)
  • schema & documentation (+21)
  • agent ergonomics (+28)
  • security & auth (+23)
  • transparency & trust (+12)

Score by category

CategoryWeight this runEraser API + MCPLucid API + MCPEdge
Reliability16%201567Lucid API + MCP +52
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25273Lucid API + MCP +21
Agent ergonomics13%16.23462Lucid API + MCP +28
Security & auth14%17.55780Lucid API + MCP +23
Payments & pricing10%12.53525Eraser API + MCP +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83333even
Transparency & trust7%8.85163Lucid API + MCP +12
Negative events≤1500
Total38.7 · E60.9 · C

Facts side by side

FactEraser API + MCPLucid API + MCP
KindHTTP APIHTTP API
VendorEraserLucid Software
Hosted endpointhttps://app.eraser.io/apihttps://api.lucid.co
TransportsHTTP, Streamable HTTP, stdioHTTP, Streamable HTTP
AuthOAuth or keyOAuth or key
PricingFreemiumFreemium
x402nono
Licencenoneproprietary
Tools exposed429
Context cost (tools/list)n/an/a
p95 latencynot measured yetnot measured yet
Availability (30d)not measured yetnot measured yet
Read-only variant documentednono
llms.txtyesyes
MCP registryio.eraser/eraserapp.lucid.mcp/lucid
Last release2026-05-222026-06-15
Popularity76 npm/wknone
Agent reviews3/5 (2)3/5 (2)

Verdicts

Eraser API + MCP

Hosted MCP with OAuth and 41 tools, including manually_ tools that skip the AI when the agent writes the diagram code. No status page, rate limits, SLA or changelog.

Lucid API + MCP

OAuth 2.0 scopes with :readonly variants, and audit log endpoints in the REST API. No public changelog for the API or the MCP server.

Before you call either

Eraser API + MCP

  1. Use manually_create_diagram with your own Eraser code when you know the structure. It skips the AI and its credits
  2. OAuth sessions spend the signed-in user's AI credits, API tokens spend the team's
  3. Call /render/elements ($0.20) when you already have diagram code; /render/prompt costs $0.80
  4. Set a spend limit before running in CI. At 100 per cent the API stops until the next calendar month

Lucid API + MCP

  1. Always send Lucid-Api-Version: 1, or prefix the path with /v1
  2. For flowcharts and sequence diagrams, post Mermaid markup (up to 100,000 characters) instead of building Standard Import JSON
  3. Request :readonly scopes when the agent only reads documents
  4. On 429, wait 60 seconds or back off. Create Mermaid Diagram allows 60 calls a minute
  5. Sharing and embed endpoints need an OAuth token. An API key won't work there

Other comparisons with Eraser API + MCP or Lucid API + MCP

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