Overview
Firma.dev and API to MCP are two developer-focused tools that solve different problems. Firma.dev is an ultra-low-cost e-signature API designed for SaaS teams to embed document signing into their applications. API to MCP converts REST and GraphQL APIs into hosted MCP servers that AI agents can use. This comparison helps you decide which tool fits your needs.
Feature Comparison
| Feature | Firma.dev | API to MCP |
|---|---|---|
| Primary Function | E-signature API for embedding signing | Converts APIs to MCP servers for AI agents |
| Target Audience | Developers, SaaS teams, startups | Developers, AI agent users |
| Integration Method | REST API, iFrame, pre-built UI | Visual dashboard or AI agent builder |
| Authentication | API key-based | No auth, API Key, Bearer, Basic, OAuth |
| White-Labeling | Fully white-label | Not a primary feature |
| Compliance | SOC 2, ISO 27001, eIDAS, GDPR | Enterprise security mentioned |
| Pricing Model | €0.029/envelope, pay-as-you-go | Not publicly detailed |
| AI Agent Support | Not applicable | Native support for ChatGPT, Claude, etc. |
| Workflow Tools | Not applicable | Compose multiple API calls |
| Testing Environment | Free sandbox with unlimited usage | Test requests before deployment |
Pricing
Firma.dev: €0.029 per envelope with no monthly fees, no contracts, and no minimums. A free sandbox allows unlimited testing with real documents before paying.
API to MCP: Pricing is not publicly detailed. It likely follows a subscription model based on usage, number of MCP servers, or features. Contact sales for details.
Pros and Cons
Firma.dev
Pros:
- Ultra-low cost at €0.029 per envelope
- Fully white-label and rebrandable
- Developer-first with simple REST API and quick integration
- Strong compliance (SOC 2, ISO 27001, eIDAS, GDPR)
- Free sandbox for unlimited testing
Cons:
- Limited to e-signature use case only
- No AI agent or MCP support
- Pricing may add up for high-volume sending
API to MCP
Pros:
- Converts any REST/GraphQL API to MCP server quickly
- Supports multiple authentication methods including OAuth
- Works with popular AI agents (ChatGPT, Claude, Codex, etc.)
- Visual builder and AI agent builder for flexibility
- Workflow tools for multi-step API calls
Cons:
- Pricing unclear; may be expensive for high usage
- No white-labeling or rebranding options
- Compliance certifications not prominently listed
- Requires understanding of MCP protocol
Verdict
Choose Firma.dev if you need an affordable, compliant, white-label e-signature API for your SaaS app. Choose API to MCP if you want to expose any API as an MCP server for AI agents. They serve different purposes and can even complement each other.
API to MCP
Firma.dev