Independently check externally sourced factual claims in agent research and repo
Independently check externally sourced factual claims in agent research and reports. Returns supported, contradicted, mixed or insufficient_evidence with web sources. Use when a claim needs a cited second check; not for transaction simulation, wallet risk or deterministic arithmetic. Live verification costs 0.20 USDC on Base via x402 v2.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
1758 msmedian answer time
$0.2listed price per call
$0.2price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.saververify.com/v2/verify
| Category | Market data |
|---|---|
| Provider host | api.saververify.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 5 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.2 | 1758 ms |
Example input (from the provider)
{
"body": {
"claim": "NASA initially reported that DART shortened Dimorphos's orbital period around Didymos by 32 minutes, and later refined that measurement to 33 minutes. These figures describe an orbital-period change, not a change in a predicted Earth-impact time.",
"context": "Checking apparently conflicting figures in a science and engineering briefing. Assess the original and revised measurements and what they measure, using primary sources."
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"claim": {
"description": "Claim or factual statement to verify",
"maxLength": 8000,
"minLength": 1,
"pattern": "\\S",
"type": "string"
},
"context": {
"description": "Optional additional context",
"maxLength": 12000,
"type": "string"
}
},
"required": [
"claim"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}