SAVER Verifier GitHub
Live on Base Mainnet • x402 v2

Verify before
the agent acts.

Source-backed factual claim verification for autonomous AI agents. Give software an independent evidence check before it pays, commits, or makes a consequential decision.

Integrate SAVER Inspect x402 discovery
No API key 0.20 USDC / verification Machine-native discovery
agent → SAVER
LIVE
01
claim "The Ethereum mainnet launched on July 30, 2015."
02
verify
x402 · 0.20 USDC · Base
03
result
Status supported
Confidence 0.98
Evidence source-backed
evidence sources confidence explanation
✓
Security audit Pass · v1.0.2
◇
OpenAPI + x402 Machine discoverable
Protocol x402 v2
Network Base Mainnet
Settlement USDC
Price 0.20 USDC
Audit Pass
Why SAVER

Agents can pay autonomously.
They still need to know what to trust.

SAVER adds an independent verification layer between information and execution. It does not replace wallet policy, transaction simulation, or deterministic security controls. It answers a different question: is the factual premise supported by current evidence?

01

Independent second opinion

Verify a claim produced by another model, tool, API, or agent before relying on it.

02

Source-backed evidence

Receive structured output with evidence, cited sources, confidence, and explanation.

03

Native agent payments

Protected by x402 on Base Mainnet. No API key or manual billing integration required.

The trust gate

A minimal primitive for consequential workflows.

01 Discover

Read SAVER's x402 and OpenAPI metadata.

→
02 Verify

Submit the factual premise that matters.

→
03 Decide

Evaluate evidence, sources, and confidence.

→
04 Pay / Act

Continue only if your own policy allows it.

Integrate

One endpoint.
Built for software, not forms.

Send a claim to POST /verify. An unpaid request returns HTTP 402 with payment requirements. A compatible x402 client authorizes payment and retries.

OpenAPI specification ↗ x402 discovery ↗ OpenClaw skill on ClawHub ↗ 
POST /verify
Content-Type: application/json

{
  "claim": "The Ethereum mainnet launched
            on July 30, 2015.",
  "context": "Example verification request"
}
{
  "status": "supported",
  "confidence": 0.98,
  "evidence": [...],
  "sources": [...],
  "explanation": "...",
  "timestamp": "..."
}
Security by design

Verification is evidence.
Not permission.

SAVER is designed to complement — not bypass — wallet policy, approvals, transaction simulation, sanctions checks, or deterministic controls.

Read the security policy ↗
✓
ClawHub security audit Pass
v1.0.2
01

Require explicit approval per charge or enforce bounded spending policy.

02

Use SAVER as an evidence signal inside your existing execution policy.

03

Never expose wallet private keys, API secrets, or deployment credentials.

Agent-native discovery

Designed to be found by machines.

Discovery x402 well-known

Price, network, scheme, resource metadata, and service ownership.

↗ Contract OpenAPI 3.1

Machine-readable request and response contract for POST /verify.

↗ Skill OpenClaw / ClawHub

Agent-native usage guidance, security controls, and integration behavior.

↗ Visibility x402scan

Public ecosystem visibility for the live x402 service.

↗
For autonomous systems

Give your agent a reason
to trust before it acts.

View integration docs ↗ 0.20 USDC · Base Mainnet · x402