Discover / web3-tools.x402tookit.com

Web3 Tools

■ Challenge detected

Validate a Bitcoin address (legacy, P2SH, SegWit bech32, Taproot bech32m): checksum, type, network and hash payload.

Listed price
$0.02
Challenge detected
1 of the last check
Median response
662 ms
Last checked
21 Oct, 00:26 UTC
In our index since
21 Oct 2026

Endpoint

curl -i https://web3-tools.x402tookit.com/btc-address
# 402 Payment Required: pay with an x402 client (USDC on Arbitrum),
# then send the same request again with the payment attached.
12 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://web3-tools.x402tookit.com

  • GET/evm-addressNo price listedCheck an EVM address (Ethereum, Base, Polygon...) against its EIP-55 checksum and return the correctly checksummed form.
  • GET/function-selectorNo price listedCompute the 4-byte function selector and event topic0 from a Solidity signature such as transfer(address,uint256).
  • GET/ens-namehashNo price listedCompute the ENS namehash (EIP-137) and label hashes for a name such as vitalik.eth, for contract calls and subgraph queries.
  • GET/keccak256No price listedKeccak-256 hash (the Ethereum one) of text or hex bytes, with the first-4-byte selector and NIST SHA3-256 for contrast.
  • GET/solana-addressNo price listedValidate a Solana address: base58, 32 bytes, and whether it is on the ed25519 curve (wallet) or off it (program-derived).
  • GET/tx-hash-checkNo price listedRecognise what a transaction id looks like (EVM hash, Bitcoin txid, Solana signature) from format alone, and flag typos.
  • GET/calldata-splitNo price listedSplit EVM calldata into its 4-byte selector and 32-byte words, naming common ERC-20/721 calls and spotting addresses.
  • GET/unit-convertNo price listedExact unit conversion for crypto amounts: wei, gwei, ether, lamports, SOL, satoshis, BTC or a token with N decimals.
  • GET/hex-convertNo price listedConvert hex to UTF-8 text or an integer (signed or unsigned), and text or integers to hex with 32-byte padding.
  • GET/caip-parseNo price listedParse CAIP-2 chain ids, CAIP-10 account ids and CAIP-19 asset ids: namespace, reference, known chain name, address check.
  • GET/contract-addressNo price listedPredict a contract address: CREATE from deployer and nonce, or CREATE2 from deployer, salt and init code (or its hash).
  • GET/btc-addressNo price listedValidate a Bitcoin address (legacy, P2SH, SegWit bech32, Taproot bech32m): checksum, type, network and hash payload.

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

Showing 12 of 12 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/web3-tools.x402tookit.com

Recent checks

21 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.21 Oct 2026
All 1 checks
When (UTC)ResultHTTPResponse
21 Oct, 00:26 UTCChallenge detected402662ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 21 Oct, 00:26 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 Web3 Tools?

Its listed price is $0.02.

What payment terms does Web3 Tools advertise?

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

Where is Web3 Tools listed?

In x402 Bazaar. Superstables first indexed it on 21 Oct 2026.

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