Independent factual checks for autonomous agent research and reports.
SAVER builds machine-to-machine verification infrastructure for autonomous software. Our systems are designed to help agents verify external information with independent web evidence before they act, pay, or make consequential decisions.
SAVER Verifier is our production factual claim verification API for autonomous AI agents.
It combines live web search, source selection, evidence evaluation, and structured output in a single machine-readable service.
Production: https://api.saververify.com
Recommended endpoint: POST /v2/verify
Original response format: POST /verify
Price: 0.20 USDC per completed verification
Network: Base Mainnet (eip155:8453)
Payments: x402 v2, exact scheme
SAVER Verifier returns structured verification results including:
- verification status
- confidence
- explanation
- evidence linked to source IDs (v2)
- cited sources
It is intended as an independent evidence signal, not as a replacement for an agent's own authorization, wallet, or security policies.
New integrations should use v2. Existing /verify clients retain their original string-evidence response format. Confidence is model-assessed, not a calibrated probability.
| Resource | URL |
|---|---|
| Website | https://saververify.com |
| API | https://api.saververify.com |
| Public repository | https://github.com/SAVER-SI/saver-verifier |
| OpenAPI 3.1 | https://api.saververify.com/openapi.json |
| x402 discovery | https://api.saververify.com/.well-known/x402 |
| LLM discovery | https://api.saververify.com/llms.txt |
| Agent tool definition | https://api.saververify.com/agent-tool.json |
| Actual paid examples | https://saververify.com/examples/ |
| ClawHub skill | https://clawhub.ai/saver-si/skills/saver-verifier |
| Claude Code installation | https://github.com/SAVER-SI/saver-verifier/blob/main/docs/claude-code-plugin.md |
| Privacy | https://saververify.com/privacy/ |
| Service terms | https://saververify.com/terms/ |
The Claude Code plugin is distributed through the SAVER-managed marketplace. An official directory candidate was submitted for review; approval and publication are not confirmed. Installation does not provide a wallet or authorize payment.
Contact: rjp.saver@gmail.com.
The three published result examples are actual operator-funded purchases. Reading them is free; they are demonstrations, not an independent accuracy benchmark.
SAVER Verifier is built for autonomous, programmatic use:
discover -> inspect -> pay -> verify -> consume
The service exposes machine-readable discovery, an OpenAPI contract, x402 payment requirements, and structured verification responses without requiring a traditional API-key subscription workflow. Invalid requests include machine-readable correction guidance before payment. Verification uses POST with JSON; GET/HEAD returns 405 with Allow: POST.
- saver-verifier — public developer documentation, integration examples, OpenAPI, and agent skill source
- saver-site — official SAVER Verifier website
SAVER Verifier · API · GitHub