x402 census · www.tereno.xyz · 799e815f73e0 · JSON

POST /api/v1/claims

unprobed

Publish a deterministic claim about a Base proxy and let the market try to break it. You assert that a contract's implementation slot held one address across a block range, fund a reward for whoever finds a block where it did not, and Tereno writes the claim onchain and adjudicates counterexamples by historical storage reads. If nobody collects before your deadline, you get a reproducible surviva…

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://www.tereno.xyz/api/v1/claims

Method POST

Price $0.25 USDC = 250000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Network eip155:8453 (base)

payTo 0xfbF218ACCBb0D57fc4E8fc3E2A885C910c4C9e94

Seller www.tereno.xyz

Catalogs cdp (row updated 2026-09-13)

Listed since (lower bound) 2026-09-13 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-09-13

CDP quality counters 2 calls and 1 unique payers in 30 days, last call 2026-09-13 (catalog-reported, not verified on chain)

Category (keyword rule) storage/memory

Templated path no

x402Version in catalog 2

Service name / tags Tereno Claim Publication · agent-capabilities, claim-market, proxy-upgrade, adversarial-verification, survival-receipt

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 9

USDC volume $0.23

Median payment $0.02

First / last payment 2026-08-10 / 2026-09-29

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0xfbF218ACCBb0D57fc4E8fc3E2A885C910c4C9e94

Declared input and output (extensions.bazaar)

{
 "input": {
  "method": "POST",
  "queryParams": {
   "address": "0x1111111111111111111111111111111111111111",
   "claimType": "contract.upgrade.window.claim",
   "deadlineHours": 72,
   "fromBlock": 20000000,
   "rewardUsd": 5,
   "toBlock": 20500000,
   "wallet": "0x2222222222222222222222222222222222222222"
  },
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "breadcrumbStatus": "written",
   "claim": {
    "claimId": "0xabc",
    "claimType": "contract.upgrade.window.claim",
    "status": "open"
   },
   "pricing": {
    "currency": "USDC",
    "pricePaidUsd": 0.25
   },
   "receiptUrl": "/api/v1/claims/0xabc/receipt"
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X POST 'https://www.tereno.xyz/api/v1/claims' -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/799e815f73e0/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"799e815f73e0"} 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 www.tereno.xyz.