{"id":"f49a1d11-a3c0-476c-aec1-9397d80070cc","shortId":"P6n6td","kind":"x402","title":"Check wallet balance by WIF key via x402 micropayment on Base network for $0.02/request.","tagline":"Check wallet balance by WIF key via x402 micropayment on Base network for $0.02/request.","description":"This endpoint at lowpaymentfee.com accepts a POST request with a WIF (Wallet Import Format) private key and returns the associated wallet balance. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com, all settled via the x402 protocol on the Base network using USDC.\n\nThe x402 challenge confirms the endpoint is live and charges a maximum of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made via the x402 \"exact\" scheme to the specified payTo address. There are no API keys, no rate limits, and no subscription commitments — each call is individually paid for at the time of request.\n\nThe provider's landing page lists many other endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all at the same $0.02 price point. However, the specific endpoint cataloged here is `/api/v1/wallet/WIF/balance`, which falls under crypto/wallet utility. Documentation beyond the landing page is essentially empty (all doc pages just show \"Connect wallet\"), so the exact request body schema and response format are unknown.","tags":[],"capabilities":["wallet-balance-lookup","wif-key-input","x402-payment","usdc-settlement","base-network","pay-per-call"],"categories":["crypto","finance"],"synonyms":["wallet balance API","WIF balance check","Bitcoin wallet balance","crypto wallet balance","private key balance lookup","x402 wallet API"],"warnings":["Submitting a WIF private key to a third-party API is a significant security risk — the server could extract funds from the wallet.","No documentation exists beyond the landing page; all linked doc pages are empty stubs showing only 'Connect wallet'.","Request body schema and response format are completely undocumented; the example request is inferred from the URL path.","The provider lists many endpoints but none appear to have detailed documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/WIF/balance","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wallet/WIF/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network, but there is zero documentation on request/response schemas. All doc/pricing/API pages return only 'Connect wallet' with no useful content. The exact behavior and response format of this endpoint must be inferred entirely from the URL 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'/request':15,30 '0.02':14,29,100,165 '000':95 '20':94 '6':107 'Bitcoin wallet balance' 'WIF balance check' 'accept':35 'across':154 'address':121 'ai/ml':156 'api':65,125 'associ':50 'balanc':3,18,52 'base':11,26,77,96 'base-network' 'beyond':182 'bodi':200 'broader':58 'call':64,135 'catalog':172 'categori':160 'challeng':83 'charg':90 'check':1,16 'commit':133 'confirm':84 'connect':194 'crypto wallet balance' 'crypto/wallet':179 'data/analytics':155 'decim':108 'doc':190 'document':181 'empti':188 'endpoint':32,86,153,171 'essenti':187 'exact':115,198 'fall':177 'finance/web3':157 'format':44,204 'howev':168 'import':43 'individu':137 'infrastructur':159 'key':6,21,46,126 'land':148,184 'limit':129 'list':150 'live':88 'lowpaymentfee.com':34,68 'made':111 'mani':151 'maximum':92 'micropay':9,24 'network':12,27,78 'offer':66 'page':149,185,191 'paid':138 'part':55 'pay':62 'pay-per-cal':61 'pay-per-call' 'payment':109 'payto':120 'per':63,102 'point':167 'post':37 'price':166 'privat':45 'private key balance lookup' 'protocol':74 'provid':146 'rate':128 'request':38,103,144,199 'respons':203 'return':48 'schema':201 'scheme':116 'settl':70 'show':193 'sinc':104 'specif':170 'specifi':119 'subscript':132 'suit':59 'time':142 'unit':97 'unknown':206 'usd':101 'usdc':80,99,105 'usdc-settlement' 'use':79,106 'util':180 'via':7,22,71,112 'wallet':2,17,42,51,195 'wallet balance API' 'wallet-balance-lookup' 'wif':5,20,41 'wif-key-input' 'x402':8,23,73,82,114 'x402 wallet API' 'x402-payment'","prices":[{"id":"42545d90-1f99-4e64-b326-e1a432058edd","listingId":"f49a1d11-a3c0-476c-aec1-9397d80070cc","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/wallet/WIF/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:34.362Z"}],"sources":[{"listingId":"f49a1d11-a3c0-476c-aec1-9397d80070cc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/WIF/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:34.362Z","lastSeenAt":"2026-04-23T09:31:50.631Z"}],"details":{"listingId":"f49a1d11-a3c0-476c-aec1-9397d80070cc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/WIF/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{\"wif\": \"<your_WIF_key>\"}'","exampleRequest":{"wif":"5HueCGU8rMjxEXxiPuD5BDku4MkFqeZyd4dZ1jvhTVqvbTLvyTJ"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with x402 version 1 challenge, confirming it is live.","source_url":"https://lowpaymentfee.com/api/v1/wallet/WIF/balance"},{"claim":"Price is 20,000 base units of USDC (USD Coin, 6 decimals) = $0.02 per request on Base network.","source_url":"https://lowpaymentfee.com/api/v1/wallet/WIF/balance"},{"claim":"The provider advertises $0.02/request, no API keys, no rate limits, instant access, Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Checking the balance of a wallet given its WIF private key","Programmatic balance verification before initiating transactions","Agent-driven portfolio monitoring across wallets"],"bestFor":["Developers needing quick, keyless wallet balance lookups","AI agents that need to verify crypto wallet balances on-the-fly","Pay-per-use access without subscription overhead"],"notFor":["Bulk or high-frequency balance polling (no documented batch endpoint)","Users who need detailed transaction history rather than just a balance","Anyone uncomfortable submitting a WIF private key to a third-party API"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.838Z"},"updatedAt":"2026-04-23T09:31:50.631Z"}}