{"version":3,"file":"blockscout.mjs","names":["createChain"],"sources":["../../src/providers/blockscout.ts"],"sourcesContent":["/**\n * Blockscout provider — open-source block explorer\n *\n * No API key needed. Deployed on many chains. REST API v2.\n *\n * Public instances: - eth.blockscout.com - base.blockscout.com - optimism.blockscout.com -\n * arbitrum.blockscout.com - gnosis.blockscout.com - polygon.blockscout.com - linea.blockscout.com -\n * scroll.blockscout.com - zksync.blockscout.com\n */\n\nimport type {\n ProviderCapabilities,\n ProviderConfig,\n ChainKey,\n Balance,\n Transaction,\n TxHistoryOptions,\n ContractInfo,\n TokenBalance,\n TokenBalanceOptions,\n TokenTransferOptions,\n GasData,\n BlockInfo,\n TxStatus,\n TokenTransfer,\n} from \"../core/types.js\";\nimport { Provider } from \"../core/provider.js\";\nimport { buildQuery, normalizeBaseUrl } from \"../core/client.js\";\nimport { NotFoundError, UnsupportedChainError } from \"../core/errors.js\";\nimport { assertSafePathSegment } from \"../core/path-safety.js\";\nimport { create as createChain } from \"@agntn/chains\";\nimport { clampMaxResults, formatWei, multiplyIntegerStrings } from \"../core/types.js\";\n\nconst DEFAULT_BASE = \"https://eth.blockscout.com\";\nconst TOKEN_BALANCE_DEFAULT_TIMEOUT = 60_000;\n\nconst CHAIN_BASES: Partial> = {\n ethereum: DEFAULT_BASE,\n base: \"https://base.blockscout.com\",\n arbitrum: \"https://arbitrum.blockscout.com\",\n optimism: \"https://optimism.blockscout.com\",\n polygon: \"https://polygon.blockscout.com\",\n gnosis: \"https://gnosis.blockscout.com\",\n linea: \"https://linea.blockscout.com\",\n scroll: \"https://scroll.blockscout.com\",\n zksync: \"https://zksync.blockscout.com\",\n avalanche: \"https://avalanche.blockscout.com\",\n};\n\ninterface BlockscoutAddress {\n readonly hash: string;\n readonly coin_balance: string | null;\n readonly implementation_address?: string;\n readonly is_contract: boolean;\n readonly is_verified: boolean;\n readonly name?: string;\n readonly token?: {\n readonly name: string;\n readonly symbol: string;\n readonly decimals: string;\n readonly type: string;\n };\n}\n\ninterface BlockscoutTx {\n readonly hash: string;\n /** Null until the transaction is mined. */\n readonly block_number: number | null;\n readonly timestamp: string | null;\n readonly from: { readonly hash: string };\n readonly to: { readonly hash: string } | null;\n readonly value: string;\n readonly gas_used: string | null;\n readonly gas_price: string | null;\n /** \"ok\", \"error\", or null while the transaction is still pending. */\n readonly status: string | null;\n readonly method?: string;\n readonly transaction_types?: readonly string[];\n readonly token_transfers?: readonly BlockscoutTokenTransfer[];\n}\n\ninterface BlockscoutTokenTransfer {\n readonly token: {\n readonly address_hash: string;\n readonly symbol: string;\n readonly name: string;\n readonly decimals: string;\n readonly type: string;\n };\n readonly from: { readonly hash: string };\n readonly to: { readonly hash: string };\n /** ERC-721/1155 transfers carry token_id here instead of value. */\n readonly total: { readonly value?: string };\n readonly transaction_hash: string;\n readonly block_number: number;\n readonly timestamp: string;\n}\n\ninterface BlockscoutTokenBalance {\n readonly token: {\n readonly address_hash: string;\n readonly symbol: string | null;\n readonly name: string | null;\n readonly decimals: string | null;\n readonly type: string;\n } | null;\n readonly value: string;\n readonly token_id?: string;\n}\n\ninterface BlockscoutContractInfo {\n readonly is_verified: boolean;\n readonly is_proxy?: boolean;\n readonly proxy_type?: string | null;\n readonly implementation_address?: string;\n readonly implementations?: ReadonlyArray<{ readonly address_hash: string }>;\n readonly name?: string;\n readonly compiler_version?: string;\n readonly abi?: ReadonlyArray>>;\n readonly source_code?: string;\n readonly creation_tx_hash?: string;\n readonly deployer?: string;\n}\n\ninterface BlockscoutBlock {\n readonly height: number;\n readonly hash: string;\n readonly parent_hash: string;\n readonly timestamp: string;\n readonly miner: { readonly hash: string };\n readonly gas_used: string;\n readonly gas_limit: string;\n readonly transactions_count: number;\n readonly base_fee_per_gas?: string;\n}\n\ninterface BlockscoutGasPrice {\n readonly average?: string | number;\n readonly fast?: string | number;\n readonly slow?: string | number;\n}\n\ninterface BlockscoutTransactionPage {\n readonly items: readonly BlockscoutTx[];\n readonly next_page_params?: Record | null;\n}\n\nfunction getBase(chain: ChainKey): string {\n const base = CHAIN_BASES[chain];\n if (!base) throw new UnsupportedChainError(chain, \"blockscout\");\n return base;\n}\n\n/* Map fungible transfers to the domain shape; ERC-721/1155 items have no value and are skipped. */\nfunction mapTokenTransfers(raw: Readonly): TokenTransfer[] {\n const transfers: TokenTransfer[] = [];\n for (const tt of raw ?? []) {\n if (tt.total.value === null || tt.total.value === undefined) continue;\n const decimals = Number(tt.token.decimals);\n transfers.push({\n contract: tt.token.address_hash,\n symbol: tt.token.symbol,\n name: tt.token.name,\n decimals,\n value: tt.total.value,\n valueFormatted: formatWei(tt.total.value, decimals),\n from: tt.from.hash,\n to: tt.to.hash,\n txHash: tt.transaction_hash,\n blockNumber: tt.block_number,\n timestamp: tt.timestamp,\n });\n }\n return transfers;\n}\n\nfunction transactionFee(raw: Readonly): string | undefined {\n if (raw.gas_used === null || raw.gas_used === undefined) return undefined;\n if (raw.gas_price === null || raw.gas_price === undefined) return undefined;\n return multiplyIntegerStrings(raw.gas_used, raw.gas_price);\n}\n\nfunction transactionStatus(status: string | null | undefined): TxStatus {\n if (status === \"ok\") return \"success\";\n return status === null || status === undefined ? \"pending\" : \"failed\";\n}\n\nfunction mapTx(raw: Readonly): Transaction {\n const valueWei = BigInt(raw.value).toString();\n\n return {\n hash: raw.hash,\n // Transaction.blockNumber is required, so pending txs get 0, the same\n // sentinel the etherscan and mempool providers use.\n blockNumber: raw.block_number ?? 0,\n timestamp: raw.timestamp ?? undefined,\n from: raw.from.hash,\n to: raw.to?.hash ?? null,\n value: valueWei,\n valueFormatted: formatWei(valueWei),\n gasUsed: raw.gas_used ?? undefined,\n gasPrice: raw.gas_price ?? undefined,\n fee: transactionFee(raw),\n status: transactionStatus(raw.status),\n methodId: undefined,\n functionName: raw.method,\n isContractInteraction:\n raw.transaction_types?.some(\n (type) => type === \"contract_call\" || type === \"contract_creation\",\n ) ?? false,\n tokenTransfers: mapTokenTransfers(raw.token_transfers),\n raw: raw as unknown as Record,\n };\n}\n\nfunction isTokenAbi(abi: readonly Readonly>[] | undefined): boolean {\n return (\n abi?.some((item) => {\n if (item.type !== \"function\") return false;\n const name = typeof item.name === \"string\" ? item.name : undefined;\n return name === \"transfer\" || name === \"balanceOf\" || name === \"totalSupply\";\n }) ?? false\n );\n}\n\nfunction isProxyContract(data: Readonly): boolean {\n if (data.is_proxy !== null && data.is_proxy !== undefined) return data.is_proxy;\n const hasProxyType = data.proxy_type !== null && data.proxy_type !== undefined;\n return hasProxyType || (data.implementations?.length ?? 0) > 0;\n}\n\nfunction mapContractInfo(address: string, data: Readonly): ContractInfo {\n return {\n address,\n isVerified: data.is_verified,\n isProxy: isProxyContract(data),\n implementationAddress: data.implementation_address ?? data.implementations?.[0]?.address_hash,\n name: data.name,\n compilerVersion: data.compiler_version,\n abi: data.abi ? JSON.stringify(data.abi) : undefined,\n sourceCode: data.source_code,\n isToken: isTokenAbi(data.abi),\n creator: data.deployer,\n creationTxHash: data.creation_tx_hash,\n };\n}\n\nexport class Blockscout extends Provider {\n static readonly key = \"blockscout\";\n\n private defaultChain: ChainKey;\n private readonly baseUrl: string | undefined;\n private readonly tokenBalanceTimeout: number;\n\n constructor(config: Readonly) {\n super(config);\n this.defaultChain = config.defaultChain ?? \"ethereum\";\n this.baseUrl = config.baseUrl ? normalizeBaseUrl(config.baseUrl) : undefined;\n this.tokenBalanceTimeout = config.timeout ?? TOKEN_BALANCE_DEFAULT_TIMEOUT;\n }\n get capabilities(): ProviderCapabilities {\n return {\n balances: true,\n txHistory: true,\n txDetail: true,\n utxos: false,\n contractInfo: true,\n tokenBalances: true,\n tokenTransfers: true,\n gasData: true,\n blockInfo: true,\n };\n }\n\n private base(chain?: ChainKey): string {\n const chainBase = getBase(chain ?? this.defaultChain);\n return this.baseUrl ?? chainBase;\n }\n\n async getBalance(address: string, chain?: ChainKey): Promise {\n const c = chain ?? this.defaultChain;\n assertSafePathSegment(address, \"address\");\n const url = `${this.base(c)}/api/v2/addresses/${encodeURIComponent(address)}`;\n const data = await this.getJSON(url);\n const balance = data.coin_balance ?? \"0\";\n\n return this.snapshotBalance({\n address,\n chain: c,\n balance,\n balanceFormatted: formatWei(balance),\n symbol: createChain(c).symbol,\n });\n }\n\n /**\n * Follow Blockscout's 50-item keyset pages up to the 100-result provider limit.\n *\n * @param {string} address - The `address` value.\n * @param {ChainKey} chain - The `chain` value.\n * @param {Readonly} options - The `options` value.\n * @returns {Promise} The resulting value.\n */\n async getTxHistory(\n address: string,\n chain?: ChainKey,\n options?: Readonly,\n ): Promise {\n const c = chain ?? this.defaultChain;\n assertSafePathSegment(address, \"address\");\n const limit = clampMaxResults(options?.limit);\n const baseUrl = `${this.base(c)}/api/v2/addresses/${encodeURIComponent(address)}/transactions`;\n\n const transactions: Transaction[] = [];\n let cursor: Record = {};\n for (let fetches = 0; fetches < 2 && transactions.length < limit; fetches++) {\n const data = await this.getJSON(`${baseUrl}${buildQuery(cursor)}`);\n if (!data.items.length) break;\n transactions.push(...data.items.slice(0, limit - transactions.length).map(mapTx));\n if (!data.next_page_params) break;\n cursor = data.next_page_params;\n }\n return transactions.slice(0, limit);\n }\n\n override async getTxDetail(hash: string, chain?: ChainKey): Promise {\n const c = chain ?? this.defaultChain;\n assertSafePathSegment(hash, \"tx hash\");\n const url = `${this.base(c)}/api/v2/transactions/${encodeURIComponent(hash)}`;\n const data = await this.getJSON(url);\n return mapTx(data);\n }\n\n override async getContractInfo(address: string, chain?: ChainKey): Promise {\n const c = chain ?? this.defaultChain;\n assertSafePathSegment(address, \"address\");\n\n // Try verified contract first\n try {\n const url = `${this.base(c)}/api/v2/smart-contracts/${encodeURIComponent(address)}`;\n const data = await this.getJSON(url);\n return mapContractInfo(address, data);\n } catch (error) {\n if (!(error instanceof NotFoundError)) throw error;\n const addrUrl = `${this.base(c)}/api/v2/addresses/${encodeURIComponent(address)}`;\n const addr = await this.getJSON(addrUrl);\n\n return {\n address,\n isVerified: addr.is_verified,\n name: addr.name,\n isToken: addr.token !== null && addr.token !== undefined,\n };\n }\n }\n\n override async getTokenBalances(\n address: string,\n chain?: ChainKey,\n options?: Readonly,\n ): Promise {\n const c = chain ?? this.defaultChain;\n assertSafePathSegment(address, \"address\");\n const url = `${this.base(c)}/api/v2/addresses/${encodeURIComponent(address)}/token-balances`;\n const balances = await this.getJSON(url, {\n timeout: this.tokenBalanceTimeout,\n });\n\n let tokens = balances.flatMap((item) => {\n const token = item.token;\n if (token?.type !== \"ERC-20\") return [];\n const decimals = Number(token.decimals ?? 0);\n return [\n {\n contract: token.address_hash,\n symbol: token.symbol ?? \"\",\n name: token.name ?? undefined,\n decimals,\n balance: item.value,\n balanceFormatted: formatWei(item.value, decimals),\n },\n ];\n });\n\n if (options?.nonZeroOnly) {\n tokens = tokens.filter((t) => t.balance !== \"0\");\n }\n\n return tokens;\n }\n\n /**\n * Walk the keyset-paginated ERC-20 transfer list until `limit` is reached.\n *\n * The endpoint accepts only a token filter and a `next_page_params` cursor. Block range, sort,\n * and page have no server-side equivalent and are ignored, the same way `getTxHistory` ignores\n * them.\n *\n * @param {string} address - The `address` value.\n * @param {ChainKey} chain - The `chain` value.\n * @param {Readonly} options - The `options` value.\n * @returns {Promise} The resulting value.\n */\n override async getTokenTransfers(\n address: string,\n chain?: ChainKey,\n options?: Readonly,\n ): Promise {\n const c = chain ?? this.defaultChain;\n assertSafePathSegment(address, \"address\");\n const limit = clampMaxResults(options?.limit);\n const baseUrl = `${this.base(c)}/api/v2/addresses/${encodeURIComponent(address)}/token-transfers`;\n\n const transfers: TokenTransfer[] = [];\n let cursor: Record = {};\n // Pages hold 50 items and the limit clamps at 100, so 4 fetches always cover it.\n for (let fetches = 0; fetches < 4 && transfers.length < limit; fetches++) {\n const query = buildQuery({ type: \"ERC-20\", token: options?.token, ...cursor });\n const data = await this.getJSON<{\n items?: BlockscoutTokenTransfer[];\n next_page_params?: Record | null;\n }>(`${baseUrl}${query}`);\n if (!data.items?.length) break;\n transfers.push(...mapTokenTransfers(data.items));\n if (!data.next_page_params) break;\n cursor = data.next_page_params;\n }\n return transfers.slice(0, limit);\n }\n\n override async getGasData(chain?: ChainKey): Promise {\n const c = chain ?? this.defaultChain;\n const url = `${this.base(c)}/api/v2/stats`;\n const data = await this.getJSON>(url);\n\n // Blockscout stats endpoint varies; extract gas data if available\n const gasPrices = data.gas_prices as BlockscoutGasPrice | undefined;\n\n return {\n chain: c,\n unit: \"gwei\",\n safeGasPrice: gasPrices?.slow === undefined ? undefined : String(gasPrices.slow),\n proposedGasPrice: gasPrices?.average === undefined ? undefined : String(gasPrices.average),\n fastGasPrice: gasPrices?.fast === undefined ? undefined : String(gasPrices.fast),\n };\n }\n\n override async getBlockInfo(blockNumber: number, chain?: ChainKey): Promise {\n const c = chain ?? this.defaultChain;\n assertSafePathSegment(String(blockNumber), \"block number\");\n const url = `${this.base(c)}/api/v2/blocks/${encodeURIComponent(String(blockNumber))}`;\n const data = await this.getJSON(url);\n\n return {\n number: data.height,\n hash: data.hash,\n parentHash: data.parent_hash,\n timestamp: data.timestamp,\n miner: data.miner.hash,\n gasUsed: data.gas_used,\n gasLimit: data.gas_limit,\n txCount: data.transactions_count,\n baseFee: data.base_fee_per_gas,\n };\n 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