x402 census · x402-tools-production-2755.up.railway.app · d52853bf8766 · JSON
GET /tools/gas
live
Use before sending an EVM transaction to pick the cheapest chain and set its fees. Live gas on Ethereum, Base, Arbitrum, Optimism, Polygon and BSC: slow/standard/fast EIP-1559 fee tiers (priority fee, maxFee) from recent blocks, plus the USD cost of a transfer, ERC-20 transfer and swap per tier, cheapest chain first.
Verdict: live. The unpaid GET reached a valid 402 (confirmed by the re-probe of 2026-10-01).
Facts from the catalogs
| Field | Value |
|---|---|
| URL | https://x402-tools-production-2755.up.railway.app/tools/gas |
| Method | GET |
| Price | $0.002 USDC = 2000 atomic units of 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 |
| Network | eip155:8453 (base) |
| payTo | 0xef7674f50f84e9b9a89af9dc40ffea56edf67d6c |
| Seller | x402-tools-production-2755.up.railway.app |
| Catalogs | cdp (row updated 2026-09-29) |
| Listed since (lower bound) | 2026-09-29 (earliest catalog timestamp; catalogs report last-update times only) |
| Last catalog update | 2026-09-29 |
| CDP quality counters | 3 calls and 1 unique payers in 30 days, last call 2026-09-29 (catalog-reported, not verified on chain) |
| Category (keyword rule) | money-movement |
| Templated path | no |
| x402Version in catalog | 2 |
| Service name / tags | x402 tools |
Unpaid probe (census of )
| Field | Value |
|---|---|
| Probe | not probed in this build |
Latest re-probe
| Field | Value |
|---|---|
| Re-probed at | 2026-10-01T07:13:42.000Z (cron) |
| Verdict now | live changed from unprobed |
| HEAD / GET | 200 / 402 |
| accepts[0] | {"scheme":"exact","network":"eip155:8453","amount":"2000","payTo":"0xef7674f50f84e9b9a89af9dc40ffea56edf67d6c","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","maxTimeoutSeconds":120,"extra":{"name":"USD Coin","version":"2"}} |
| Live amount equals catalog price | yes |
| Latency | 766 ms |
| Error | none |
On-chain facts for the payTo (public address)
| Field | Value |
|---|---|
| Distinct payers | 1 |
| Payments | 36 |
| USDC volume | $0.12 |
| Median payment | n/a |
| First / last payment | 2026-09-29 / 2026-09-30 |
| Sampler-shaped share of payments | n/a |
| Payers that are not samplers | n/a |
| Source | blockscout-sample — newest page of inbound ERC-20 transfers only (<=50); counts are a floor, not a total |
| Address | 0xef7674f50f84e9b9a89af9dc40ffea56edf67d6c |
Declared input and output (extensions.bazaar)
{
"input": {
"method": "GET",
"queryParams": {
"chains": "base,ethereum"
},
"type": "http"
},
"output": {
"type": "json",
"example_truncated": true,
"chars": 750
}
}
Try it (unpaid: shows the 402)
curl -si -X GET 'https://x402-tools-production-2755.up.railway.app/tools/gas' -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/d52853bf8766/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"d52853bf8766"} 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 x402-tools-production-2755.up.railway.app.