agents.factstamp.dev
A two-cent probe of the FactStamp engine: one small claim in, one cited answer out, receipted. Send a dated figure, a company name, a DOI/arXiv id or a package@version and get the verdict, the value and the source it rests on with our retrieval time — the same engine and the same sources the full-price doors read. Unknown is a valid answer and nothing is invented. Paid per call in USDC on Base; no pack code and no unpaid tier.
Offering
- Provider
- agents.factstamp.dev
- Method
- POST
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Other
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://agents.factstamp.dev/probe- MIME type
- Not provided
- First seen
- 2026-10-23T22:25:34.290Z
- Last seen
- Tags
- None supplied
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.02 USDC
Atomic price: 20000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "20000",
"payTo": "0xc3bcd24a2b350cc73b8516b2a0539a323b42cc32"
}
]Observed health
- Status
- Reachable
- Latest latency
- 281 ms
- Average latency
- 369 ms
- HTTP status
- 405
- Last checked
- Reachability
- 100% over 7 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"properties": {
"type": {
"const": "http"
},
"method": {
"const": "POST"
},
"bodyType": {
"const": "application/json"
},
"body": {
"type": "object"
}
},
"required": [
"type",
"method"
],
"additionalProperties": true
}Output schema
{
"type": "object",
"properties": {
"type": {
"const": "json"
},
"example": {
"type": "object"
}
},
"required": [
"type",
"example"
],
"additionalProperties": true
}