x402 census · store.agentexchange.work · febe4f9bfa57 · JSON
GET /chain/heartbeat
unprobed
One call replaces the multi-request health sequence autonomous agents repeat before acting: EIP-155 chain ID, latest block height/header and age, gas price, EIP-1559 fee direction and recommended fee, safe/finalized tips when supported, utilization and a HEALTHY/CONGESTED/STALE verdict. Covers Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis and the newly live Robinhood Chain (chain ID 4663). …
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://store.agentexchange.work/chain/heartbeat |
| Method | GET |
| Price | $0.09 USDC = 90000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | base (base); also accepts solana |
| payTo | 0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c |
| Seller | store.agentexchange.work |
| Catalogs | store |
| Listed since (lower bound) | unknown |
| Last catalog update | unknown |
| CDP quality counters | not in the CDP catalog |
| Category (keyword rule) | trading-signals |
| Templated path | no |
| x402Version in catalog | 1 |
| Service name / tags | Chain Heartbeat — Identity, Tip, Freshness, Gas, Fees & Finality · onchain, rpc, heartbeat, chain-health, chain-id, block, freshness, gas, fee-history, finality, multichain, robinhood-chain |
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 | 169 |
| Payments | 827 |
| USDC volume | $14.40 |
| Median payment | $0.001 |
| First / last payment | 2026-06-10 / 2026-09-30 |
| Sampler-shaped share of payments | 32.6% |
| Payers that are not samplers | 20 |
| Source | forensics-2026-09-30 |
| Address | 0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c (contract: CoinbaseSmartWallet) |
Try it (unpaid: shows the 402)
curl -si -X GET 'https://store.agentexchange.work/chain/heartbeat' -H 'accept: application/json'
The catalog declares GET. 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/febe4f9bfa57/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"febe4f9bfa57"} 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: this record as JSON · all resources on store.agentexchange.work.