{"id":"8267be25-c205-4dad-8565-0af8818c9b3f","shortId":"JTX9uz","kind":"x402","title":"x402-gated account balance endpoint on Base, paid per-request in USDC.","tagline":"x402-gated account balance endpoint on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/95/balance` returns JSON data when called with a valid x402 payment header. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted purely through per-call micropayments. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the timeout window is 300 seconds.\n\nDocumentation is extremely sparse. The 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 beyond the x402 output schema stub, and no explanation of what \"account balance\" data is actually returned. The platform's landing page lists many endpoints across multiple domains but provides no detailed documentation for any of them.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","per-request-micropayment","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No documentation available — all doc/API/pricing/README pages render only 'Connect wallet' with no content.","The specific endpoint /api/v1/accounts/95/balance is not listed among the platform's advertised APIs; its purpose and response format are unknown.","No OpenAPI spec or request/response schema provided.","No examples of successful responses available anywhere in crawled content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/95/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/95/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually returns, no request/response schemas, and no examples. The docs pages are empty. The specific endpoint path (/accounts/95/balance) is not even listed on the landing page, making its purpose 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'0.02':87,130 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x8335':115 '20':124 '2913':116 '300':163 '402 payment required' '6':133 'Base network API' 'USDC pay-per-call' 'accept':107 'access':37,143 'account':4,18,38,206 'account balance API' 'account-balance' 'across':220 'actual':210 'address':155 'advertis':69,142 'ai':76 'amount':122 'analyt':75 'api':36,71,136,171 'balanc':5,19,39,207 'base':8,22,96,118,126 'base-network' 'beyond':195 'broader':66 'call':54,150 'categori':72 'challeng':100 'confirm':101 'connect':180 'content':186 'contract':114 'crypto payment API' 'data':52,74,208 'decim':134 'detail':226 'doc':170 'document':165,227 'domain':222 'endpoint':6,20,30,103,219 'equal':129 'exact':109 'exact-schem':108 'explan':203 'extrem':167 'financ':79 'gate':3,17 'grant':145 'header':60 'includ':73 'infrastructur':82 'json':51 'json-response' 'key':137 'land':215 'learn':78 'limit':140 'list':217 'live':105 'lookup':40 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':77 'mani':218 'maximum':121 'micropay':151 'multipl':70,221 'network':97 'no-api-key' 'openapi':190 'output':198 'page':175,216 'paid':9,23 'part':63 'payment':44,59,111,153 'per':11,25,88,149 'per-cal':148 'per-request':10,24 'per-request-micropayment' 'platform':67,213 'premium':35 'price':85,172 'prompt':182 'protocol':45 'provid':33,224 'pure':146 'rate':139 'readm':174 'recipi':154 'render':177 'request':12,26,89 'request/response':193 'resourc':48 'return':50,211 'schema':194,199 'scheme':110 'second':164 'settl':91 'spars':168 'spec':191 'specif':47 'stub':200 'timeout':160 'unit':127 'usdc':14,28,93,113,131 'usdc-settlement' 'use':132 'util':83 'valid':57 'via':41 'wallet':181 'web3':80 'window':161 'x402':2,16,43,58,99,197 'x402 micropayment API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6cea5ee8-33b8-40bb-8cda-f378e6c677fa","listingId":"8267be25-c205-4dad-8565-0af8818c9b3f","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/95/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":"2026-04-18T18:40:21.946Z"}],"sources":[{"listingId":"8267be25-c205-4dad-8565-0af8818c9b3f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/95/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:21.946Z","lastSeenAt":"2026-04-28T02:33:33.827Z"}],"details":{"listingId":"8267be25-c205-4dad-8565-0af8818c9b3f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/95/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/95/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/95/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 lists 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 micropayments","Integrating pay-per-call APIs without managing API keys or subscriptions","Demonstrating x402 payment protocol usage on the Base network"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who prefer micropayments over subscriptions"],"notFor":["Users needing well-documented APIs with clear request/response schemas","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.373Z"},"updatedAt":"2026-04-28T02:33:33.827Z"}}