x402 census · concordancehq.duckdns.org · dc2fc291b44e · JSON
POST /tools/corroboration
unprobed
Is a claim independently corroborated across multiple unrelated sources, or does it trace back to a single origin? Groups matches by SOURCE (not category) so a caller sees exactly how many independent outlets/agencies back a claim -- a trust signal no single-source competitor can offer, since it requires already owning many independent sources.
Verdict: not verified by an unpaid GET. not probed yet. This says nothing about whether the route works when called as declared.
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://concordancehq.duckdns.org/tools/corroboration |
| Method | POST |
| Price | $0.04 USDC = 40000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base); also accepts solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| payTo | 0x1f5f8474fA0dc1Fde79187abd68Ef8Ea15ADAe34 |
| Seller | concordancehq.duckdns.org |
| Catalogs | cdp (row updated 2026-09-28) |
| Listed since (lower bound) | 2026-09-28 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-28 |
| CDP quality counters | 1 calls and 1 unique payers in 30 days, last call 2026-09-28 (catalog-reported, not verified on chain) |
| Category (keyword rule) | trading-signals |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | corroboration · fact-checking, trust-signal, source-verification, claim-checking, multi-source |
Unpaid probe (census of )
| Field | Value |
|---|---|
| Probe | not probed in this build |
No hourly re-probe has reached this resource yet; the cron covers a rotating slice of 150 per hour.
On-chain facts for the payTo (public address)
| Field | Value |
|---|---|
| Distinct payers | 7 |
| Payments | 31 |
| USDC volume | $0.43 |
| Median payment | $0.01 |
| First / last payment | 2026-07-22 / 2026-09-29 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0x1f5f8474fA0dc1Fde79187abd68Ef8Ea15ADAe34 |
Declared input and output (extensions.bazaar)
{
"input": {
"body": {
"claim": "the Federal Reserve raised interest rates"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"type": "json",
"example": {
"claim": "the Federal Reserve raised interest rates",
"corroboration_level": "corroborated",
"distinct_source_count": 3,
"sources": [
{
"category": "news_events",
"count": 4,
"source": "gdelt",
"top_published_at": "2026-07-19T18:30:00+00:00",
"top_title": "Fed raises rates by 25bps",
"top_url": "https://example.com/article"
}
],
"total_matches": 7
}
}
}
Try it (unpaid: shows the 402)
curl -si -X POST 'https://concordancehq.duckdns.org/tools/corroboration' -H 'accept: application/json' -H 'content-type: application/json' --data '{}'
The catalog declares POST. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.
Paid checks (x402, USDC on Base)
GET https://bazaar.agentexchange.work/r/dc2fc291b44e/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"dc2fc291b44e"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.
Catalog references: agentic.market (CDP Bazaar front end) · this record as JSON · all resources on concordancehq.duckdns.org.