x402 census · api.fairseal.io · 3a110c28720b · JSON
POST /v1/notarize
open
Anchor an AI agent decision or audit record to Base mainnet. Submit {schema, payload_hash (SHA-256 hex, 64 chars), metadata}; service queues into a Merkle batch and returns a receipt with pending_anchor status immediately. Full Merkle proof and on-chain anchor_tx available via free GET /v1/notarize/:receipt_id after batch anchors (within batch_threshold receipts or 120s). Include Idempotency-Key …
Verdict: not verified by an unpaid GET. 200: serves without a payment challenge. This says nothing about whether the route works when called as declared.
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://api.fairseal.io/v1/notarize |
| Method | POST |
| Price | $0.02 USDC = 20000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base) |
| payTo | 0xBd5eB5559f5Ac14475AC0C81b6735A4d9106ce28 |
| Seller | api.fairseal.io |
| Catalogs | cdp (row updated 2026-09-26) |
| Listed since (lower bound) | 2026-09-26 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-26 |
| CDP quality counters | 3 calls and 1 unique payers in 30 days, last call 2026-09-26 (catalog-reported, not verified on chain) |
| Category (keyword rule) | research/reports |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | none |
Unpaid probe (census of )
| Field | Value |
|---|---|
| Probe | not probed in this build |
Latest re-probe
| Field | Value |
|---|---|
| Re-probed at | 2026-10-02T11:13:42.000Z (cron) |
| Verdict now | open changed from unprobed |
| HEAD / GET | 200 / 200 |
| accepts[0] | none |
| Live amount equals catalog price | not comparable |
| Latency | 1,166 ms |
| Error | none |
On-chain facts for the payTo (public address)
| Field | Value |
|---|---|
| Distinct payers | 3 |
| Payments | 3 |
| USDC volume | $0.01 |
| Median payment | $0.005 |
| First / last payment | 2026-08-24 / 2026-09-17 |
| Sampler-shaped share of payments | 100.0% |
| Payers that are not samplers | 0 |
| Source | forensics-2026-09-30 |
| Address | 0xBd5eB5559f5Ac14475AC0C81b6735A4d9106ce28 |
Declared input and output (extensions.bazaar)
{
"input": {
"body": {
"metadata": {
"agent_id": "my-agent-v1",
"decided_at": "2026-09-12T10:00:00Z",
"decision_hash": "b94f6f125c79e3a5ffaa826f584c10d52ada669e6762051b826b55776d05a3d7",
"input_hash": "a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3"
},
"payload_hash": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
"schema": "agent_decision"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
}
Try it (unpaid: shows the 402)
curl -si -X POST 'https://api.fairseal.io/v1/notarize' -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/3a110c28720b/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"3a110c28720b"} 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 api.fairseal.io.