{"id":"bca5d336-89c3-4301-b6ad-b000d5998aa8","shortId":"cfmXgh","kind":"x402","title":"Check ETH wallet balances via x402 micropayment on Base for $0.02 per request.","tagline":"Check ETH wallet balances via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns ETH wallet balance data, accessible through the x402 payment protocol. It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints on the platform share a uniform $0.02 per-request pricing model, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/wallet/ETH/balance` accepts POST requests and returns JSON. Payment is handled via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals). The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. No API keys or rate limits are advertised; access is instant once payment is provided.\n\nDocumentation is extremely sparse. The provider's docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but the actual request body format and response structure are unknown.","tags":[],"capabilities":["eth-balance-lookup","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["crypto","finance"],"synonyms":["ETH balance API","Ethereum wallet balance","crypto balance check","wallet balance query","blockchain balance lookup","x402 crypto API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","Request body schema is unknown; the example_request_json is speculative.","Response schema is completely undocumented; example_response_json is null.","No OpenAPI or machine-readable spec provided by the endpoint.","The provider offers many endpoints but none appear to have public documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/ETH/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/ETH/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 pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The request body format and response structure are entirely unknown and had to be guessed. This is effectively a stub 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'0.02':11,24,77,130 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':142 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':149 '20':125 '402':210 '6':134 'ETH balance API' 'Ethereum wallet balance' 'accept':94 'access':36,158 'actual':214 'address':141 'advertis':157 'ai/ml':63 'analyt':62 'api':54,151,173 'attach':111 'balanc':4,17,34 'base':9,22,88,127,144 'base-network' 'blockchain balance lookup' 'bodi':216 'broader':47 'call':53 'caller':110 'challeng':211 'check':1,14 'confirm':205 'connect':182 'content':188 'contract':148 'crypto balance check' 'data':35,61 'decim':135 'direct':139 'doc':172 'document':165,197 'endpoint':28,70,92,203 'eth':2,15,32 'eth-balance-lookup' 'exact':107 'exact-pay':106 'exampl':201 'extrem':167 'finance/web3':65 'format':217 'handl':102 'header':116 'i.e':129 'infer':64 'instant':160 'json':99 'json-response' 'key':152 'limit':155 'live':206 'lowpaymentfee.com':30 'micropay':7,20 'model':82 'network':89 'no-api-key' 'offer':55 'openapi':192 'page':177 'part':44 'pay':51 'pay-per-cal':50 'pay-per-request' 'payment':40,100,108,115,121,137,162 'per':12,25,52,79 'per-request':78 'platform':73 'post':95 'price':81,174 'prompt':184 'proper':209 'protocol':41 'provid':59,164,170 'rate':154 'readm':176 'render':179 'request':13,26,80,96,215 'request/response':195 'respons':219 'return':31,98,207 'schema':196 'scheme':109 'servic':68 'settl':83 'share':74 'sign':119 'sinc':131 'span':60 'spars':168 'spec':193 'specif':91 'structur':220 'suit':48 'uniform':76 'unit':128 'unknown':222 'usag':200 'usdc':85,120,132,147 'usdc-settlement' 'use':133,145 'util':67 'via':5,18,103 'wallet':3,16,33,183 'wallet balance query' 'x':114 'x-payment':113 'x402':6,19,39,105 'x402 crypto API' 'x402-payment'","prices":[{"id":"39c40f8a-816b-4325-81e4-19c8f765eac2","listingId":"bca5d336-89c3-4301-b6ad-b000d5998aa8","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/ETH/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":"2026-04-18T19:28:14.851Z"}],"sources":[{"listingId":"bca5d336-89c3-4301-b6ad-b000d5998aa8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/ETH/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:14.851Z","lastSeenAt":"2026-04-23T12:32:02.996Z"}],"details":{"listingId":"bca5d336-89c3-4301-b6ad-b000d5998aa8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/ETH/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -d '{\"address\": \"0xYourEthAddress\"}'","exampleRequest":{"address":"0x1234567890abcdef1234567890abcdef12345678"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network, with maxAmountRequired of 20000 base units of USDC","source_url":"https://lowpaymentfee.com/api/v1/wallet/ETH/balance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/ETH/balance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying ETH wallet balances programmatically without managing API keys","Integrating wallet balance checks into agent workflows that support x402 payments","Building dashboards or bots that need on-demand ETH balance data"],"bestFor":["Agents or apps that already support x402 payment flows on Base","Low-volume, on-demand ETH balance lookups without subscription commitments","Developers who want keyless API access paid per call in USDC"],"notFor":["High-volume balance monitoring where per-request fees add up quickly","Users who need detailed transaction history or token balances beyond ETH","Anyone requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.784Z"},"updatedAt":"2026-04-23T12:32:02.996Z"}}