VaxVoIP Agent AI SDK vs x402serps

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

VaxVoIP Agent AI SDK compared with x402serps
Detail	VaxVoIP Agent AI SDK	x402serps
What it does	SIP-to-OpenAI gateway for building real-time multilingual AI voice agents	Pay-per-call web search API for AI agents
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	GB
Pricing model	Paid	Freemium
Pricing	Annual commercial licensing: 10 concurrent calls $1,480, 20 concurrent calls $2,620, 40 concurrent calls $4,420, 80 concurrent calls $6,420, 160 concurrent calls $8,860, Unlimited concurrent calls $10,680, Unlimited services and unlimited concurrent calls $16,860 (all USD, one year, contact sales)	Web search: $0.004/10 results; News search: $0.004/10 results; URL extract: $0.003/URL; Search + extract: $0.02; Deep research: $0.08; AI visibility check: $0.10; Competitor report: $0.30; Lead finder: $0.25; SEO audit: $0.20; News digest: $0.05; Cited answer: $0.02; Crawl site: $0.002/page; Map sit
Key features	SIP server and IP-PBX integration OpenAI real-time speech-to-speech models Multilingual voice interaction Real-time SIP audio processing Sample source code in C#, VB.NET, and Delphi 30-day fully functional trial Simplified OpenAI integration Commercial B2B deployment licensing	Web search with up to 100 results and date filtering News search with filtering options URL extraction to clean markdown Deep research with cited briefs Competitor report with rankings and share of voice Lead finder for local businesses SEO audit with page analysis JavaScript, Python, and LangChain integrations OpenAI and Claude function calling support MCP server with 19 tools
What makes it different	Gateway handles SIP audio bridging so developers focus on voice-agent logic Direct real-time connection between SIP calls and OpenAI speech models Eliminates complex OpenAI protocol and media integration overhead Includes working sample projects with documentation and demo videos Supports natural multilingual conversations on live calls	No account or subscription required for x402 payments Pay-per-call pricing with no minimum Cryptocurrency payment option using USDC Result caching reduces cost for credit key users Free trial with 25 calls per network
Community votes	0	0
DR (Domain Rating by Ahrefs)	21 −3 (down) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	44	0
Citation Flow (Majestic)	31	27
Referring domains (Majestic)	95	11

5 details filled in for both companies.

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