Blockchain And Crypto x402 offerings

Machine-readable endpoint directory for api2ls.com — lists every priced /api/<endpoint> with method, path, price, and description

Get the live spot price of a crypto/asset pair

Get the live USD price of an ERC-20 token from on-chain DEX liquidity

Get the live native or ERC-20 token balance of an address

Extract readable content and markdown from any webpage URL

Get live fiat foreign-exchange rates (ECB reference rates)

Validate EIP-712 typed structured data and derive its domain separator, message hash, and signing digest.

Inspect Base mainnet contract bytecode, common token metadata, and ERC-165, ERC-721, and ERC-1155 interface signals at one resolved block.

Get and inspect one historical Base mainnet block by exact number or a latest, safe, or finalized tag, returning its header timestamp, transaction count, gas use, base and blob fees, state and receip…

Execute one bounded read-only eth_call against a resolved Base mainnet block, retain call and block evidence, and optionally decode caller-specified ABI output types.

Estimate gas for one Base mainnet transaction context at a resolved block, add a bounded caller-selected buffer, and preserve RPC rejection evidence without signing or broadcasting.

Validate and normalize an Ethereum or EVM wallet address, distinguish valid, absent, or invalid ERC-55 checksum casing, and identify the zero address without a network request.

Read the latest Base mainnet block and a bounded EIP-1559 fee history in one RPC batch, including gas utilization and priority-fee percentile samples.

Check one Base mainnet wallet or contract for ETH and official USDC balances, transaction nonce, and contract-bytecode evidence at a single resolved block.

Read point-in-time ETH, native USDC, and up to four caller-selected ERC-20 balances plus account nonce and contract-code status at one resolved Base mainnet block.

Inspect Base transaction status and receipt evidence in one call, including success, revert, or pending state, confirmations, actual gas fee, recognized calldata, bounded ERC-20-shaped transfers, and…

The same UUID generation on the x402 face: the body adds network/asset (base/USDC) as in the reference x402 listing's response.

Fetch items from an Apify Actor run default dataset. Body: { "token": "..." } from actors/call. First call per wallet pays via x402 proportional to Apify usage (capped at $1.00); SIWX replay is free. Poll /api/actors/status until terminal — calling before terminal returns 409. POST only — never GET; token in JSON body, not query string.

Base gas oracle / gas price API for AI agents and bots — get the gas price for a transaction on Base in one x402 call. Real-time slow/standard/fast EIP-1559 fee tiers from a live eth_feeHistory call, returned as DROP-IN maxFeePerGas + maxPriorityFeePerGas in wei — plug straight into a viem/ethers transaction, no gwei conversion. Plus base fee, head block, and network fullness. Call it before every Base tx to set a fair fee or wait out congestion.

A snapshot of the total crypto market: aggregate market capitalization in USD, 24-hour trading volume, Bitcoin and Ethereum dominance percentages, 24h market-cap change, and the number of active cryptocurrencies and markets. The macro view in one call. Sourced from CoinGecko.

Latest crypto token prices by ticker symbol, CoinGecko id, or chain:address (BTC, ETH, SOL, or base:0x…): current spot price, token symbol, decimals, and a confidence score, for up to 50 coins in one call. Pass ?at=<unix> for the historical price at a point in time. Sourced from DefiLlama across every major chain.

The Crypto Fear & Greed index: the current market-sentiment score (0–100) and its classification (Extreme Fear → Extreme Greed), plus optional daily history. A widely-watched contrarian signal for crypto market timing. Sourced from Alternative.me.

Highest-yield DeFi pools across every chain and protocol, filterable by chain, project, or asset symbol: each pool returns TVL in USD, total APY with base/reward split, stablecoin flag, impermanent-loss risk, and exposure. Sort by APY or TVL, and set sustainable=true to exclude IL-risky pure reward-emission farms. Find where to earn yield on USDC, ETH, SOL and more. Sourced from DefiLlama.

Decentralized exchange (DEX) trading volume ranked by protocol: 24-hour and 7-day volume in USD with 1d/7d change, plus the chains each DEX runs on. Pass ?chain=base to scope to one chain. See where on-chain trading is happening across Uniswap, Curve, Raydium, PancakeSwap and more. Sourced from DefiLlama.