Your AI needs facts, not hallucinations
SignalStack verifies businesses, documents, media, and claims against 30+ authoritative data sources. You get a trust score and complete evidence trail every time. Your AI agents only act on verified information.
import { SignalStack } from "@signalstack/sdk"▊Click "Try the API" to runAPI Playground
Try any of our four verification APIs. Select a tab, enter your query, and see real results with trust scores and evidence chains.
Verify company registration, operating status, and legitimacy against government registries and global databases.
Built for real AI workloads
Use cases where your AI systems need verified data before they act.
KYC Onboarding for Fintech
Verify businesses against Companies House, SEC EDGAR, GLEIF, and global sanctions lists before onboarding. Multi-source corroboration with an auditable evidence trail.
Learn more →AI Agent Tool-Call Verification
Catch hallucinations before they reach your users. Verify every claim, fact, and entity your agent fetches before it acts.
Learn more →Invoice & Document Fraud Detection
Catch tampered PDFs, forged signatures, and AI-generated invoices before you pay. Document analysis flags manipulated metadata in real time.
Learn more →Media Provenance Verification
Verify image and video authenticity with C2PA provenance signals and EXIF analysis. Detect deepfakes before they go live.
Learn more →Fits right into your stack
How it works
One API call. Your agent sends a verification request. SignalStack queries 30+ data sources, computes a weighted trust score, and returns the evidence trail with source attribution.
SDKs for your stack
Native SDKs in Python, TypeScript, Go, and Rust. Plus a CLI, MCP server, and an Agent SDK for LangChain, CrewAI, and AutoGen.
Simple, usage-based pricing
Start for free. Scale as you grow. Pay only for what you use.
Free
Start for free — no credit card required.
- ✓500 verifications/month
- ✓All 4 verification types
- ✓Free data sources
- ✓REST API access
- ✓1 team member
- ✓Community support
Starter
For small teams and production prototypes.
- ✓5,000 verifications/month
- ✓All 4 verification types
- ✓Abstract Phone + Email enrichment
- ✓Webhook integrations
- ✓99.5% uptime SLA
- ✓Email support
- ✓1 team member
- ✓$0.015/verification overage
Business
For growing teams that need higher throughput and priority support.
- ✓50,000 verifications/month
- ✓All 4 verification types
- ✓Company enrichment + news sources
- ✓WebSocket API + webhooks
- ✓Custom trust scoring
- ✓Fraud detection
- ✓5 team members
- ✓Priority support
- ✓99.9% uptime SLA
- ✓$0.01/verification overage
Enterprise
For organizations with custom security, compliance, and deployment needs.
- ✓Unlimited verifications
- ✓All 4 verification types
- ✓All data sources including OpenCorporates
- ✓Custom trust models
- ✓SSO/SAML + audit logging
- ✓On-premise deployment
- ✓24/7 dedicated support
- ✓Custom SLA up to 99.99%
- ✓Custom data source integrations
All plans include business, document, media, and claim verification — plus webhooks, audit logs, and API access.
Compare all featuresFrequently asked questions
SignalStack is a trust infrastructure platform for AI agents. It provides verification APIs (business, document, media, claim) with trust scoring, evidence chains, and webhook delivery — enabling AI systems to verify information before acting on it.
Simple lookups (business registration) typically complete in ~1s. Complex verifications (document analysis, media provenance) take 1-3 seconds depending on the analysis depth requested.
We query government registries, global entity databases, sanctions lists, tax authorities, fact-check databases, news archives, and LLM providers — over 30 sources total. The specific sources vary by verification type and plan tier.
Each verification type has weighted dimensions (e.g., for business: registration match 35%, tax ID validity 20%, address consistency 20%, etc.). Scores range 0.0-1.0, with verdicts: verified (≥0.5), partial (≥0.25), or unverified (<0.25).
Yes. We deliver HMAC-SHA256 signed webhooks for verification.completed, verification.failed, verification.processing, key.revoked, team.member_added, and quota.warning events, with exponential backoff retry up to 5 attempts. Configure endpoints in the dashboard.
Python (signalstack), TypeScript (@signalstack/sdk), Go (signalstack-go), Rust (signalstack), a specialized Agent SDK (signalstack-agent) with LangChain tool wrappers, plus the SignalStack CLI (@signalstack/cli) for terminal usage and an MCP server (@signalstack/mcp-server) for direct AI agent integration.
Yes. The Free plan includes 500 verifications per month with no credit card required. Upgrade to Starter ($79/mo) or Business ($399/mo) when you need more volume and paid data sources.
AES-256 at rest, TLS 1.3 in transit, RBAC with fine-grained API key permissions, WAF protection, rate limiting, and immutable audit logging. SOC 2 Type II in progress.