Discover / chainsscope.duckdns.org

fee_estimate

□ No challenge detected

Current network fee conditions -- gas price (ETH/Base/Arbitrum/Optimism/Polygon), sat/vB fee tiers (Bitcoin), or recent prioritization fees (Solana) -- useful for an agent about to construct a transaction itself.

x402
Base
Solana
USDC

Listed price: $0.01
Challenge detected: 0 of the last 9 checks
Last checked: 16 Oct, 13:59 UTC
In our index since: 26 Sept 2026

Endpoint

curl -i https://chainsscope.duckdns.org/tools/fee-estimate
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

2 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://chainsscope.duckdns.org/tools

POST/address-activity$0.015Recent transaction history for an address, normalized across Ethereum, Base, Arbitrum, Optimism, Polygon, Bitcoin, and Solana -- direction, counterparty, and value where the chain's data model makes that derivable.
POST/fee-estimate$0.01Current network fee conditions -- gas price (ETH/Base/Arbitrum/Optimism/Polygon), sat/vB fee tiers (Bitcoin), or recent prioritization fees (Solana) -- useful for an agent about to construct a transaction itself.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 2 of 2 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/chainsscope.duckdns.org

Recent checks

27 Sept 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.16 Oct 2026

All 9 checks

When (UTC)	Result	HTTP	Response
16 Oct, 13:59 UTC	No challenge detected	405	306ms
14 Oct, 23:56 UTC	No challenge detected	405	334ms
13 Oct, 10:39 UTC	No challenge detected	405	260ms
11 Oct, 10:02 UTC	No challenge detected	405	291ms
9 Oct, 21:31 UTC	No challenge detected	405	322ms
8 Oct, 15:35 UTC	No challenge detected	405	274ms
7 Oct, 09:33 UTC	No challenge detected	405	264ms
6 Oct, 09:33 UTC	No challenge detected	405	284ms
27 Sept, 17:02 UTC	No challenge detected	405	361ms

Questions

Did our last probe detect a payment challenge?

No. At our last probe on 16 Oct, 13:59 UTC, we detected no payment challenge.

What price is recorded for fee_estimate?

Its listed price is $0.01.

What payment terms does fee_estimate advertise?

The listing advertises x402, Base, Solana and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is fee_estimate listed?

In x402 Bazaar. Superstables first indexed it on 26 Sept 2026.

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