Groundcheck
GET https://groundcheck.seiche.info/check
Listed in x402 List · Data: x402-list.com (CC BY 4.0)
Claim grounding and citation attestation for AI agents: verified enrichment that adds a veracity field to text. Each factual claim is grounded against live web sources (Wikipedia + world news) and returned with a machine-verified verdict (supported/refuted/unverified), a confidence score, and cited sources. Refuses to guess on conflicting evidence. Built for research agents that must cite, citation-locked content, and compliance checks.
How to buy
This endpoint takes pay-per-call payments over x402. Call it once without paying to see its live price; any x402 client then pays and retries automatically.
curl -i -X GET "https://groundcheck.seiche.info/check"
# HTTP/1.1 402 Payment Required: price, asset and payTo are in the responseEstimated calls per day
Paid calls to groundcheck.seiche.info's tracked endpoints each day, estimated from the 30-day totals the x402 catalogues report. Each bar is the change in that 30-day total since the day before, plus the calls that left the 30-day window (taken as an average day). It is an estimate: Hagglyai does not measure or pay for these calls.
No usage reported for any of 1 tracked endpoint. Unknown usage is left out, not counted as zero.
Compared with other providers
Coverage matters: a provider whose endpoints report more of their usage can rank higher.
| # | Provider | Reported 30-day calls | Coverage |
|---|---|---|---|
| 1 | blockrun.ai | 90,334 | 30 of 36 endpoints |
| 2 | stableenrich.dev | 28,201 | 15 of 31 endpoints |
| 3 | x402.orthogonal.com | 4,071 | 189 of 249 endpoints |
| 4 | agent402.tools | 3,142 | 142 of 217 endpoints |
| 5 | api.losbeto.xyz | 1,297 | 20 of 107 endpoints |
| 6 | x402.ottoai.services | 1,268 | 28 of 32 endpoints |
| 7 | api.x402node.dev | 1,237 | 161 of 194 endpoints |
| 8 | market.datapackvibe.com | 1,188 | 684 of 1368 endpoints |