Discover / plainchain.appin60.com

Plainchain

■ Challenge detected

Debug your x402 client on Base mainnet for $0.001: returns the payment payload your client actually signed and sent, decoded: version, header used, scheme, amount, validity window, and whether it echoed extensions.bazaar (needed for Bazaar cataloging) and resource/accepted.

Listed price
$0.001042
Challenge detected
4 of the last 4 checks
Median response
463 ms
Last checked
17 Oct, 09:26 UTC
In our index since
13 Oct 2026

Endpoint

curl -i https://plainchain.appin60.com/v1/x402/echo
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.
6 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://plainchain.appin60.com/v1

  • GET/gas$0.001042Current gas price on Base, Arbitrum, Ethereum or Optimism, with the USD cost right now of an ETH transfer, ERC-20 transfer, DEX swap and NFT mint. Use before sending a transaction to pick a chain or decide whether to wait.
  • GET/balances$0.001942Wallet balances with USD values on Base, Arbitrum, Ethereum or Optimism: native ETH plus USDC, USDT, WETH and the chain's major tokens, plus up to 10 extra token addresses you pass. Returns a USD total. Use before paying, bridging or reporting a portfolio.
  • GET/fortune$0.001042A crypto fortune cookie: one short line of on-chain wisdom, picked by the latest Base block hash so anyone can verify the draw. For agent greetings, daily posts, games and demos of x402 payments.
  • GET/bazaar/search$0.001942Find x402 APIs that agents actually pay for: keyword search over the whole Coinbase x402 Bazaar (31,000+ paid endpoints), ranked by distinct paying wallets in the last 30 days. Filter by max price and network. Returns URL, method, price, 30-day payers and calls, last paid call. Use to pick a proven seller before spending.
  • GET/fact$0.001042A random crypto history fact (Bitcoin genesis, Pizza Day, The Merge, EIP-1559, x402 and HTTP 402, USDC, Base...), picked by the latest Base block hash. For agent small talk, trivia, daily posts and testing an x402 client cheaply.
  • GET/x402/echo$0.001042Debug your x402 client on Base mainnet for $0.001: returns the payment payload your client actually signed and sent, decoded: version, header used, scheme, amount, validity window, and whether it echoed extensions.bazaar (needed for Bazaar cataloging) and resource/accepted.

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

Showing 6 of 6 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/plainchain.appin60.com

Recent checks

13 Oct 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.17 Oct 2026
All 4 checks
When (UTC)ResultHTTPResponse
17 Oct, 09:26 UTCChallenge detected402462ms
16 Oct, 11:31 UTCChallenge detected402552ms
14 Oct, 23:56 UTCChallenge detected402362ms
13 Oct, 14:18 UTCChallenge detected402463ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 17 Oct, 09:26 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for Plainchain?

Its listed price is $0.001042.

What payment terms does Plainchain advertise?

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

Where is Plainchain listed?

In x402 Bazaar and x402-list.com. Superstables first indexed it on 13 Oct 2026.

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