Overview
Respan Gateway and Firma.dev serve entirely different purposes but both target developers looking for streamlined, API-first solutions. Respan Gateway is an AI model gateway that connects applications to 500+ LLMs through a single endpoint, adding reliability, observability, and cost controls. Firma.dev is an e-signature API designed for SaaS companies to embed document signing into their platforms at a fraction of the cost of traditional providers like DocuSign.
Feature Comparison
| Feature | Respan Gateway | Firma.dev |
|---|---|---|
| Primary Function | AI model gateway, routing, observability, and cost control for LLM calls | E-signature API for embedding document signing into SaaS applications |
| Target Audience | Developers and teams managing production AI workloads | Developers and SaaS companies needing white-label e-signatures |
| Integration Effort | Minutes to hours: change base URL and add extra parameters | Hours: REST API, embeddable iFrame, pre-built UI components |
| API Style | OpenAI-compatible router or passthrough with extra_body params | RESTful endpoints for templates, documents, teams, events |
| Model Support | 500+ AI models via one endpoint | N/A |
| Fallback / Retry | Built-in fallback_models, retry with backoff, load balancing across keys | N/A |
| Caching | Response caching with TTL, customer-aware cache, model-aware cache | N/A |
| Observability | Full trace trees, latency spans, logs with metadata, customer_identifier | Webhooks for document lifecycle events, real-time event stream |
| Cost Controls | Warn/block limits per API key, spend alerts, caching to reduce cost | Pay-as-you-go per envelope, no minimums |
| White-Labeling | Not a primary feature | Fully white-label: custom branding, iFrame, rebrand as your own |
| Compliance | ISO 27001, SOC 2, GDPR, HIPAA | SOC 2, ISO 27001, eIDAS, GDPR, ESIGN/UETA |
| Pricing Model | Not specified (likely usage-based or subscription) | €0.029 per envelope, no monthly fees, no contracts |
Pricing
Respan Gateway: Pricing is not publicly detailed on the website. It is likely usage-based or subscription-based, with tiered plans depending on the number of gateway calls, caching usage, and observability features. Users need to sign up and contact sales for specific pricing.
Firma.dev: Extremely transparent and affordable at €0.029 per envelope (about 3¢ USD). There are no monthly fees, no minimums, and no contracts. A free sandbox with unlimited usage is available for testing before paying anything. This makes it significantly cheaper than competitors like DocuSign, where a single envelope can cost $4-5.
Pros and Cons
Respan Gateway
Pros:
- Unified endpoint for 500+ AI models simplifies provider management
- Built-in fallback, retry, and caching improve reliability and reduce costs
- Full observability with trace trees, logs, and metadata for debugging
- Cost controls with warn/block limits and alerts per API key
- Strong compliance (ISO 27001, SOC 2, GDPR, HIPAA)
Cons:
- Pricing not transparent upfront
- Primarily focused on AI/LLM use cases, not general-purpose
- May require configuration to avoid retry stacking between app and gateway
Firma.dev
Pros:
- Extremely low cost (€0.029/envelope) compared to competitors like DocuSign
- Developer-first: clean REST API, embeddable components, integration in hours
- Fully white-label and resell-ready for SaaS platforms
- Free sandbox with unlimited usage for testing before paying
- Strong compliance (SOC 2, ISO 27001, eIDAS, GDPR)
Cons:
- Limited to e-signature functionality only
- No built-in fallback or caching mechanisms
- Pricing per envelope may add up for high-volume use
Verdict
Choose Respan Gateway if you need a robust AI model gateway with observability, fallbacks, and cost controls for production LLM workloads. Choose Firma.dev if you need an affordable, developer-friendly e-signature API to embed into your SaaS application with white-labeling and resell capabilities.
Firma.dev
Respan Gateway