Transaction Receipt API
chain.openverbs.com · 27 paid endpoints · listed 2026-10-27
Fetch deployed EVM contract runtime bytecode and its Keccak-256 code hash to fingerprint or compare contracts, or feed a disassembler. Supports Ethereum, Base, Arbitrum, Optimism and Polygon, with optional historical block reads. Returns full hex code, byte size and isContract; an empty-code address returns 0x and a null hash. Key-free RPC with endpoint fallback; code capped at 256 KiB.
livelast check 5 days ago
100%valid x402 answers, 72 h
sharedUSDC received on Base, 7 days
28distinct payers, 7 days
69.9score (0-100)
Paid endpoints
| Method | Endpoint | Price | Networks |
|---|---|---|---|
| POST | chain.openverbs.com/v1/block Live block summary by number, hex, or tag (latest/earliest/pending/safe/finalized; default latest): number, hash, parent, timestamp (unix + ISO), transaction co | $0.001 | Base |
| POST | chain.openverbs.com/v1/address Native ETH / wallet balance for an address on any EVM chain: native balance (wei + ether), transaction count (nonce), and whether it's a contract or an external | $0.002 | Base |
| POST | chain.openverbs.com/v1/ens-records Read an ENS name's address plus its text records (avatar, url, email, description, com.twitter, com.github and more) in one call, live from the resolver on Ethe | $0.002 | Base |
| POST | chain.openverbs.com/v1/gas Live gas conditions for an EVM chain: current gas price, the latest block's base fee (EIP-1559) and the suggested max priority fee — all in both wei and gwei. G | $0.002 | Base |
| POST | chain.openverbs.com/v1/token Live ERC-20 metadata read directly from the contract: name, symbol, decimals and total supply (raw + decimal-formatted). Handles both string and legacy bytes32 | $0.002 | Base |
| POST | chain.openverbs.com/v1/token-allowance Live ERC-20 spending allowance an owner has granted a spender: calls `allowance(owner, spender)` on the token and returns the raw amount, a decimal-formatted am | $0.002 | Base |
| POST | chain.openverbs.com/v1/token-balance Live ERC-20 token balance held by a wallet: calls `balanceOf(address)` on the token contract and returns the raw balance plus a decimal-formatted amount (using | $0.002 | Base |
| POST | chain.openverbs.com/v1/ens-resolve Resolve an ENS name (like alice.eth) to its Ethereum address, read live from the ENS resolver on Ethereum mainnet. Offchain names such as *.base.eth resolve too | $0.003 | Base |
| POST | chain.openverbs.com/v1/ens-reverse Reverse-resolve an Ethereum address to its primary ENS name (the reverse record set by the owner), read live on Ethereum mainnet. Returns `found:false` when the | $0.003 | Base |
| POST | chain.openverbs.com/v1/receipt Live transaction receipt by hash via `eth_getTransactionReceipt`: success/failed status, block number, from/to, created contract address, gas used, cumulative g | $0.003 | Base |
| POST | chain.openverbs.com/v1/tx Live status and details of a transaction by hash: success/failed/pending, from/to, value (wei + ether), nonce, block number, gas used, effective gas price and a | $0.003 | Base |
| POST | chain.openverbs.com/v1/decode Turn a 4-byte function selector or full calldata into its human-readable function signature, and (when calldata is present) the decoded argument values. Supply | $0.004 | Base |
| POST | chain.openverbs.com/v1/gas-estimate Simulate a transaction before signing: runs `eth_estimateGas` for `{ to, from?, data?, value? }` and returns the estimated gas units and estimated fee (current | $0.004 | Base |
| POST | chain.openverbs.com/v1/proxy Detect whether a contract is an upgradeable proxy and resolve its implementation: reads the standard EIP-1967 implementation/admin/beacon slots, EIP-1822 (UUPS) | $0.004 | Base |
| POST | chain.openverbs.com/v1/abi Get the verified contract ABI and verification metadata for a deployed contract by address, sourced from Sourcify. Returns the contract ABI (to decode or call i | $0.006 | Base |
| POST | chain.openverbs.com/v1/btc-address Balance and activity for a Bitcoin address (base58 1…/3… or bech32 bc1…): confirmed balance (sats and BTC), total received and sent, confirmed transaction count | $0.006 | Base |
| POST | chain.openverbs.com/v1/btc-fees Live recommended Bitcoin transaction fee rates (in sat/vB) for next-block, ~30-minute, ~1-hour, economy and minimum confirmation targets, straight from the memp | $0.006 | Base |
| POST | chain.openverbs.com/v1/btc-mempool Live snapshot of the Bitcoin mempool: number of unconfirmed transactions, total pending virtual size (bytes and MB), the current backlog in blocks, total fees p | $0.006 | Base |
| POST | chain.openverbs.com/v1/btc-tx Look up a Bitcoin transaction by txid: confirmation status, block height and time, fee (sats), effective fee rate (sat/vB), size, weight and virtual size, input | $0.006 | Base |
| POST | chain.openverbs.com/v1/bytecode Fetch deployed EVM contract runtime bytecode and its Keccak-256 code hash to fingerprint or compare contracts, or feed a disassembler. Supports Ethereum, Base, | $0.006 | Base |
| POST | chain.openverbs.com/v1/explain Decode a transaction into plain language: native ETH transfer, contract call (with decoded method name for common ERC-20/DEX functions like transfer, approve, s | $0.006 | Base |
| POST | chain.openverbs.com/v1/logs Query a contract's event logs over a bounded block range via `eth_getLogs`: filter by `address` (required) and optional `topics`, get back raw logs (topics, dat | $0.006 | Base |
| POST | chain.openverbs.com/v1/nft-metadata Resolve one NFT (contract + tokenId) into normalized metadata: name, description, image, attributes and token standard (ERC-721 or ERC-1155). Reads the on-chain | $0.006 | Base |
| POST | chain.openverbs.com/v1/read-contract Call a read-only (view/pure) function on any deployed contract via eth_call and get the decoded result. Give the contract address and a human-readable signature | $0.006 | Base |
| POST | chain.openverbs.com/v1/sanctions Screen a crypto wallet address against the OFAC SDN sanctions list (US Treasury Specially Designated Nationals) before transacting. Multi-chain across ~20 asset | $0.006 | Base |
| POST | chain.openverbs.com/v1/source Get the verified Solidity/Vyper source code for a deployed contract by address, sourced from Sourcify. Returns every source file (path + content), the contract | $0.006 | Base |
| POST | chain.openverbs.com/v1/token-risk Deterministic risk screen of an ERC-20 token from on-chain bytecode and metadata, no third-party risk API. Flags privileged or abuse capabilities: blacklist/fre | $0.006 | Base |
Latest checks
| When | Endpoint | HTTP | ms | Result |
|---|---|---|---|---|
| 5 days ago | chain.openverbs.com/v1/abi | 402 | 662 | valid x402 v2 terms |
Income on Base (7 days)
This provider's payout address is shared by several providers, so its income is not shown as its own.
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x402_provider_claim (sign with your payout address), and get an alert within minutes when it stops answering with x402_monitor_create ($5 for 30 days). Both work over MCP (https://logicnodes.io/mcp/v2) or POST https://logicnodes.io/v1/tools/<tool>.Income is all USDC received by the provider's payout address on Base, whatever the source. Score: 0-100: 50 x share of checks in the last 72 h that returned valid x402 payment terms + 30 x min(1, log10(1 + USDC received in 7 days) / 4) + 20 x min(1, log10(1 + distinct payers in 7 days) / 3). A provider never checked scores on income only; income is all USDC received by its payout address on Base, whatever the source. JSON: /v1/observatory/providers/chain.openverbs.com