{"id":"32e15788-d606-4606-b5f6-fe4ccdac2200","shortId":"KwhGMh","kind":"x402","title":"Check ETC wallet balances via x402 micropayment on Base network for $0.02 per request.","tagline":"Check ETC wallet balances via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns Ethereum Classic (ETC) wallet balance data, gated behind the x402 payment protocol. Each request costs $0.02 (20,000 base units of USDC on the Base network, where USDC has 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the data.\n\nThe endpoint is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. The specific endpoint probed here (`/api/v1/wallet/ETC/balance`) falls under the Finance & Web3 category and is designed to return balance information for ETC addresses.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of required input parameters. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation means callers will need to experiment to determine the expected POST body format and response structure.","tags":[],"capabilities":["x402-payment","etc-wallet-balance","crypto-balance-lookup","usdc-base-settlement","pay-per-request"],"categories":["crypto","finance"],"synonyms":["ETC balance API","Ethereum Classic wallet balance","crypto wallet balance check","ETC address balance","blockchain balance query"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no technical content","Request body format is unknown and inferred; the example_request_json is a guess","Response schema is completely unknown","No OpenAPI or machine-readable schema provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/ETC/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/ETC/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and the site's docs pages are empty. The request body and response structure are entirely 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'0.02':12,26,49,121 '000':51 '20':50 '402':195 '6':63 'ETC address balance' 'ETC balance API' 'Ethereum Classic wallet balance' 'access':88 'address':145 'ai/ml':111 'analyt':110 'api':66,104,155 'attach':75 'balanc':4,18,38,141 'base':9,23,52,58 'behind':41 'blockchain balance query' 'bodi':213 'broader':97 'call':103 'caller':73,203 'categori':135 'challeng':196 'check':1,15 'classic':35 'confirm':190 'connect':164 'cost':48 'crypto wallet balance check' 'crypto-balance-lookup' 'data':39,90,109,114 'decim':64 'descript':182 'design':138 'detail':171 'determin':209 'doc':154 'document':146,201 'endpoint':30,92,126,188 'etc':2,16,36,144 'etc-wallet-balance' 'ethereum':34 'exampl':179 'expect':211 'experi':207 'extrem':151 'fall':130 'financ':133 'finance/web3':113 'format':214 'gate':40 'header':80 'infer':112 'inform':142 'input':185 'key':67 'lack':199 'limit':70 'live':191 'lowpaymentfee.com':32,107 'mean':202 'micropay':7,21 'need':205 'network':10,24,59 'offer':105 'openapi':175 'page':159 'paramet':186 'part':94 'pay':101 'pay-per-cal':100 'pay-per-request' 'payment':44,79,85 'per':13,27,102,122 'post':212 'price':119,156 'probe':127 'prompt':166 'proof':86 'proper':194 'protocol':45 'rate':69 'readm':158 'render':161 'request':14,28,47,123 'request/response':178 'requir':72,184 'respons':216 'return':33,140,192 'schema':176 'servic':117 'simpli':74 'site':149 'span':108 'spars':152 'specif':125 'structur':217 'suit':98 'technic':170 'unit':53 'usdc':55,61 'usdc-base-settlement' 'util':116 'valid':83 'via':5,19 'wallet':3,17,37,165 'web3':134 'x':78 'x-payment':77 'x402':6,20,43,84 'x402-payment'","prices":[{"id":"0efb6752-0a59-443b-b427-21f0e7ac5e85","listingId":"32e15788-d606-4606-b5f6-fe4ccdac2200","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/ETC/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":"2026-04-18T19:28:12.436Z"}],"sources":[{"listingId":"32e15788-d606-4606-b5f6-fe4ccdac2200","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/ETC/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:12.436Z","lastSeenAt":"2026-04-23T14:31:41.406Z"}],"details":{"listingId":"32e15788-d606-4606-b5f6-fe4ccdac2200","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/ETC/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{\"address\": \"0xYourETCAddress\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/wallet/ETC/balance"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/wallet/ETC/balance"}],"useCases":["Querying ETC wallet balances programmatically without managing API keys","Building portfolio trackers that need on-demand ETC balance lookups","Agent-driven workflows that need to verify ETC holdings before executing trades"],"bestFor":["Developers who want keyless, pay-per-call access to ETC balance data","AI agents that can settle x402 micropayments on Base","Applications needing simple crypto balance checks without subscription overhead"],"notFor":["High-volume balance monitoring where $0.02/request adds up quickly","Users who need balances for chains other than ETC from this specific endpoint","Anyone requiring detailed transaction history or token-level breakdowns beyond balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.905Z"},"updatedAt":"2026-04-23T14:31:41.406Z"}}