Browse indexable blockchain and crypto x402 offerings, including provider, method, and service details.
8146 indexable offerings in this category.
ERC-20 metadata plus B20 signals for any Base address: name, symbol, decimals, total supply, best-effort paused/cap, bytecode size, and whether the address carries the factory-issued 0xB200 prefix. Works on plain ERC-20s too (isB20 comes back false).
A split, reverse split or dividend adjustment on a B20 tokenized equity is settled by moving the multiplier — and balanceOf does NOT change when it fires, so an integrator reading it is silently wrong. Cobalt made the pending change readable, so this lists every scheduled multiplier action across the 80+ tokenized stocks with its effective time, and — with wallet= — which touch a position that wallet holds. Read live from the ERC-8056 schedule; nobody else publishes it. Not financial advice. --
🆕 Live — B20 is Base's native precompile token standard, and unlike ERC-20 a B20 issuer can freeze holders (Policy Registry) and even SEIZE your balance (burnBlocked) at the protocol level. This reads those powers — seizable, freezable, paused, rebase, uncapped-mint — into one hold/caution/avoid verdict, and separates a real tokenized stock from one merely wearing an equity ticker by reading the transfer-policy admin on chain, not a list: all 13 Coinbase equities, and the next on day one.
🆕 The per-transaction B20 rail check: pass token + from + to (+ optional executor) and get one GO/HOLD/STOP on whether this exact transfer clears NOW — sender policy resolved against the sender, receiver policy against the recipient, executor policy against the operator, plus live transfer-pause. Every other B20 tool is per-token due diligence bought once; this is the check an agent runs on every payment. No ERC-20 tool can see it.
The current chain tip (latest block height) via eth_blockNumber, across Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis. The freshness read settlement, indexing and trading agents poll to know where the chain is. Live public RPC; one paid call.
Crypto backtesting & Bitcoin cycle analytics. Point-in-time, DSR-corrected, look-ahead-aware.
Crypto backtesting & Bitcoin cycle analytics. Point-in-time, DSR-corrected, look-ahead-aware.
Crypto backtesting & Bitcoin cycle analytics. Point-in-time, DSR-corrected, look-ahead-aware.
Crypto backtesting & Bitcoin cycle analytics. Point-in-time, DSR-corrected, look-ahead-aware.
badhttp /402/pay: a real x402 v2 paywall for testing clients. Pay 0.01 USDC on Base mainnet and get a 200 with a PAYMENT-RESPONSE receipt and the transaction hash. Nothing else is sold; sibling endpoints under /402 misbehave on purpose.
Query real-time stablecoin supply yield pools from Barker's index of 500+ DeFi protocols. Returns ranked rows with protocol_name, chain_name, asset_symbol, supply_apy_total (decimal — multiply by 100 for %), and supply_tvl (USD). Use for questions like 'best stablecoin yield', 'where to earn on USDC', 'compare lending rates', '稳定币利率'.
Barker's stablecoin market snapshot: total market cap, yield-bearing cap, asset distribution, chain distribution. Use for 'stablecoin market cap', 'USDT market share', '稳定币市场份额'. share_pct fields are decimals (0.425 = 42.5%).
Barker's historical APY trend for stablecoins vs. US Treasury benchmark over a lookback window (7–180 days). Use for 'DeFi vs treasury', 'is stablecoin APY going up', 'crypto yield trend', '稳定币利率走势'.
Ethereum mainnet ETH balance for one address via eth_getBalance. Takes address (0x + 40 hex) and returns the hex balance in wei. Base RPC read of address and block.
Returns full Ethereum transaction details by hash via eth_getTransactionByHash on Ethereum mainnet. Base RPC read of an address, block or transaction.
Inspect any Base address: EOA vs contract vs EIP-7702 delegated, ETH balance, nonce, proxy implementation (EIP-1967/1167/zos), and ERC-20 name/symbol/decimals/supply.
Look up the current owner of one ERC-721 token on Base with ownerOf(uint256). Accepts a strict contract address and uint256 decimal token ID, performs one read-only eth_call with bounded public-RPC fallback, and returns the normalized owner address. Reverts, non-contracts, nonexistent tokens, malformed responses, and upstream failures return non-2xx and do not settle.
Base gas price now: what an ETH transfer, a USDC transfer and a Uniswap swap cost in USD, L1 fee included. What a transaction on Base costs right now, in dollars, including the L1 data fee most gas trackers leave out. Read from real receipts in the latest Base blocks: the median a plain ETH transfer, a USDC transfer and a Uniswap swap actually paid (L2 fee + L1 fee), what the same gas costs at the current base fee and median tip, and the tip spread over 20 blocks.
Is this Base token a honeypot? Can you sell it? A real buy and full sell simulated in one block on Uniswap or Aerodrome (Virtuals tokens through their VIRTUAL pool), with the round-trip cost. Can you get out of this Base token, and what does it cost? Pass a Base token address: we find its deepest pool we can simulate (Uniswap v2, v3 or v4 against WETH or ETH, hooks included; Virtuals agent tokens through their VIRTUAL pool; Aerodrome basic and Slipstream pools against WETH, VIRTUAL or USDC),…
Is this Base token a honeypot? Can you sell it? A real buy and full sell simulated in one block on Uniswap or Aerodrome (Virtuals tokens through their VIRTUAL pool), with the round-trip cost. Can you get out of this Base token, and what does it cost? Pass a Base token address: we find its deepest pool we can simulate (Uniswap v2, v3 or v4 against WETH or ETH, hooks included; Virtuals agent tokens through their VIRTUAL pool; Aerodrome basic and Slipstream pools against WETH, VIRTUAL or USDC),…
Returns a 24h and 30d digest of Gnosis Chain fees: total fees, top categories with share and leader, and top protocols by share, read from the estate's chain-fees feed.
New token launches on Base with a real sell test: every new pool (Uniswap v2/v3/v4, Aerodrome) with a buy and full sell simulated in one block, graded BASED, MID, COOKED or RADIOACTIVE. Poll with since=<cursor>: you pay only for new rows. New token launches on Base with a real sell test: every new Base pool (Uniswap v2, v3 and v4, Aerodrome), found minutes after it opens, each token with a buy and a full sell simulated in one Base block through its deepest testable pool: BASED, MID, COOKED or…
Unlocks paywalled GET content on the Base (eip155:8453) network by accepting USDC payments to grant access to the protected resource.
Check a Base address before an agent pays or approves it. Input: one address. Output: allow or warn. Reports wallet or contract, whether the wallet has sent a transaction, whether a contract already had code 7 days ago, and whether it is a proxy (EIP-1967, EIP-1167, or implementation()). Warns on contract_is_new, proxy, or no_outgoing_transactions. Wallet age is unknown. A deleted contract looks like a wallet. Not proof of theft.