{"uid":"cap_ZdZpfhDK5fnQM4H6CH1QB","slug":"salt19-base-wallet-balance-lookup-319f8e31","name":"SALT19 Base Wallet Balance Lookup","description":"SALT19 is an independent applied AI systems lab behind EvoMind governed cognition, the MCP-native Agent Utility Grid, the ARCS research community, AeroClear UAS flight intelligence, and practical software for real-world work.","url":"https://api.salt19.com/v1/base-wallet-balance","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"address":{"type":"string","pattern":"^0x[0-9a-fA-F]{40}$"}}},"responseSchema":{"type":"json","example":{"network":"eip155:8453","balance_eth":"0","balance_wei":"0","block_number":12345678}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_GeNueCRaX8quIaZ8m--uA","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the native ETH balance (in ETH and Wei) of a given Ethereum address on the Base network (chain ID 8453)","exampleAgentPrompt":"What's the current ETH balance on the Base network for wallet address 0xAbCd1234...? Give me both the ETH amount and the block number it was checked at.","exampleUseCases":[{"title":"DeFi bot pre-flight balance check","prompt":"Before executing the swap, check how much ETH wallet 0x4a8B...c91F currently has on Base so I know if there's enough to cover gas."},{"title":"Agent treasury monitoring","prompt":"Check the ETH balance of our agent's treasury wallet 0x1234abcd...5678 on Base and tell me the balance in both ETH and Wei."},{"title":"User onboarding wallet verification","prompt":"Can you verify whether the new user's Base wallet 0xDead...Beef has any ETH in it yet — I want to know the current balance and which block it was read from."}],"resultDescription":"Returns a JSON object containing the network identifier (eip155:8453 for Base), the address's ETH balance as a decimal string, the balance in Wei as a string, and the block number at which the balance was read.","failureModes":["Invalid Ethereum address format (not matching ^0x[0-9a-fA-F]{40}$) returns a validation error","Address with zero balance returns 0 for both ETH and Wei fields — not an error","Network unavailability or Base RPC downtime may return a 5xx error","Payment failure (insufficient USDC for x402 micropayment) blocks the request","Missing or malformed address field in POST body returns a 400 bad request"],"whenToPreferThis":"Choose this endpoint when you need a fast, pay-per-call native ETH balance check on the Base network (chain 8453) without managing your own RPC infrastructure. Ideal for AI agents operating in the x402 micropayment ecosystem that need real-time balance data before executing on-chain actions. Prefer this over self-hosted RPC calls when you want metered, serverless access via a structured JSON API.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:48:44.701Z","isFirstParty":false}