PRODUCT
AI verification APIs built for agents
Four purpose-built APIs that let your AI agents verify business data, documents, images, and claims against 30+ authoritative sources. Every response includes a full evidence chain.
API Playground
Try any of our four verification APIs. Select a tab, enter your query, and see real results with trust scores and evidence chains.
$ signalstack --verify business
Verify company registration, operating status, and legitimacy against government registries and global databases.
$
Try:
Company number, LEI, phone, email, IP
Registration matchTax ID validityAddress consistencyOperating statusCross-jurisdiction matchContact verification
How it works
Your agent sends a verification request. SignalStack orchestrates multi-source lookups. You get a trust score with full evidence.
01
AI Agent
/ SDK
Initiates verification request
02
Orchestrator
SignalStack
Routes to correct engine
03
Data Sources
30+ sources
Parallel queries across registries
04
Evidence
Aggregation
Normalizes signals from all sources
08
AI Agent
Receives Result
Acts with verified confidence
07
Response
Evidence Chain
Signed delivery + webhook
06
Verdict
Pass / Flag / Block
Threshold-based decision
05
Trust Score
0.0 — 1.0
Weighted dimension computation
01
AI Agent
/ SDK
Initiates verification request
02
Orchestrator
SignalStack
Routes to correct engine
03
Data Sources
30+ sources
Parallel queries across registries
04
Evidence
Aggregation
Normalizes signals from all sources
05
Trust Score
0.0 — 1.0
Weighted dimension computation
06
Verdict
Pass / Flag / Block
Threshold-based decision
07
Response
Evidence Chain
Signed delivery + webhook
08
AI Agent
Receives Result
Acts with verified confidence
01
AI Agent
/ SDK
Initiates verification request
02
Orchestrator
SignalStack
Routes to correct engine
03
Data Sources
30+ sources
Parallel queries across registries
04
Evidence
Aggregation
Normalizes signals from all sources
05
Trust Score
0.0 — 1.0
Weighted dimension computation
06
Verdict
Pass / Flag / Block
Threshold-based decision
07
Response
Evidence Chain
Signed delivery + webhook
08
AI Agent
Receives Result
Acts with verified confidence
Data Sources
Companies House
SEC EDGAR
GLEIF
sanctions.network
VIES (EU VAT)
Abstract API
World News API
libphonenumber
OpenCorporates
OpenSanctions
Google Fact Check
Wikipedia
GDELT
Groq
~1s
Median response time
30+
Data sources
99.5–99.9%
Uptime SLA
4
Verification APIs