{"id":"4a8302d3-7cce-4de5-827f-81ed0a4a2a66","shortId":"zh4MjE","kind":"x402","title":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides account balance information behind an x402 paywall. The specific resource `/api/v1/accounts/165/balance` is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) via the x402 \"exact\" scheme. The x402 challenge confirms the endpoint is live and accepts POST requests. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nThe specific functionality of the `/api/v1/accounts/165/balance` endpoint is not well-documented beyond the generic label \"Premium API Access.\" The broader platform lists categories like metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — but this particular endpoint appears to be an account balance lookup. Documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","account-balance","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 micropayment endpoint","USDC pay-per-call","lowpaymentfee","Base network API","402 payment required API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' prompt","No request or response schema provided; the actual data returned by this endpoint is unknown","The endpoint path suggests a hardcoded account ID (165), which may limit general usefulness","The 'Premium API Access' label is generic and does not describe the endpoint's actual function"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/165/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/accounts/165/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific purpose of this endpoint ('Premium API Access' for account 165 balance) is vague. Docs pages returned only 'Connect wallet' with no 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'0.02':10,24,79,125 '000':116 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20':115 '402 payment required API' '6':121 'Base network API' 'USDC pay-per-call' 'accept':107 'access':134,161 'account':4,18,34,197 'account balance API' 'account-balance' 'advertis':133 'ai/ml':69 'amount':112 'analysi':171 'analyt':68 'api':65,127,160 'appear':193 'balanc':5,19,35,198 'base':8,22,87,117 'behind':37 'beyond':155 'broad':58 'broader':163 'call':64 'catalog':59 'categori':166 'challeng':100 'classif':174 'confirm':101 'connect':208 'content':214 'contract':91 'convers':186 'data':67,72 'decim':122 'doc':202 'document':154,200 'embed':175 'endpoint':6,20,30,49,103,149,192 'equal':124 'estim':183 'exact':96 'exchang':178 'feed':177 'finance/web3':71 'function':145 'gas':182 'gate':3,17 'generat':188 'generic':157 'geocod':184 'grant':136 'host':56 'infer':70 'inform':36 'json-response' 'key':128 'label':158 'like':167 'limit':131 'list':165 'live':105 'lookup':199 'lowpaymentfee' 'lowpaymentfee.com':32,53 'mani':48 'maximum':111 'metric':168 'micropay':142 'network':88 'no-api-key' 'offer':50 'one':46 'page':201 'particular':191 'pay':9,23,62 'pay-per-cal':61 'payment':82 'paywal':40 'per':11,25,63,80,140 'per-request':139 'per-request-micropayment' 'platform':54,164 'post':108 'premium':159 'price':77,176,203 'prompt':210 'provid':33 'pure':137 'quot':181 'rate':130,179 'readm':204 'report':169 'request':12,26,81,109,141 'requir':113 'resourc':43 'return':205 'scheme':97 'sentiment':170 'servic':75 'settl':84 'span':66 'specif':42,144 'substant':213 'summar':173 'text':172 'token':180 'unit':118 'usdc':14,28,90,120 'usdc-base' 'use':89 'util':74 'valid':185 'via':93 'wallet':209 'well':153 'well-docu':152 'x402':2,16,39,95,99 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1bee1164-891d-49e6-8a73-4767dc10aa2d","listingId":"4a8302d3-7cce-4de5-827f-81ed0a4a2a66","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/accounts/165/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":"2026-04-18T18:41:21.690Z"}],"sources":[{"listingId":"4a8302d3-7cce-4de5-827f-81ed0a4a2a66","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/165/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:21.690Z","lastSeenAt":"2026-04-27T19:33:55.346Z"}],"details":{"listingId":"4a8302d3-7cce-4de5-827f-81ed0a4a2a66","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/165/balance\n# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"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, requiring 20000 base units of USDC","source_url":"https://lowpaymentfee.com/api/v1/accounts/165/balance"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/165/balance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data with per-request USDC micropayment","Integrating pay-per-call balance lookups into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Agents or services that need on-demand account balance data without subscription commitments","Developers experimenting with x402 micropayment protocol on Base","Low-volume consumers who prefer pay-per-request pricing"],"notFor":["Users needing detailed API documentation or schema definitions before integration","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.431Z"},"updatedAt":"2026-04-27T19:33:55.346Z"}}