{"id":"38f03697-21c8-4694-a29e-6ee64374cf11","shortId":"mctjDr","kind":"x402","title":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" account balance lookup via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated behind x402 micro-payments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/accounts/58/balance` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no explanation of what the \"account balance\" resource actually returns or what parameters it accepts. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what data to send or expect back.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","account-balance","json-api"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","Purpose of 'account balance' endpoint is unclear — no indication of what account system this references","No request or response examples available anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/58/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/58/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually returns. The docs pages are all empty 'Connect wallet' 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'/api/v1/accounts/58/balance':90 '/docs':156 '/pricing':157 '/readme':160 '/request':133 '0.02':117,132 '000':106 '0x8335':111 '20':105 '2913':112 '402':202 '6':122 'Base network API' 'USDC micropayment API' 'accept':91,196 'access':37 'account':4,18,38,187 'account balance API' 'account-balance' 'across':136 'actual':190 'advertis':100 'ai/ml':66 'analyt':65 'api':36,62,141 'back':221 'balanc':5,19,39,188 'base':8,22,85,107,114 'base-network' 'behind':75 'broader':51 'call':12,26 'captur':204 'challeng':99,203 'commit':149 'confirm':129,200 'connect':166 'content':172 'cost':103 'crypto payment API' 'data':64,69,216 'decim':123 'difficult':212 'document':151,209 'endpoint':6,20,30,89,138,198 'equal':116 'exampl':180 'expect':220 'explan':183 'extrem':153 'finance/web3':68 'flat':131 'gate':3,17,74 'infer':67 'json':96 'json-api' 'key':142 'know':214 'lack':207 'land':127 'limit':145 'live':201 'lookup':40 'lowpaymentfee' 'lowpaymentfee.com':32 'make':210 'maximum':102 'micro':78 'micro-pay':77 'minimum':148 'model':135 'network':86 'offer':54 'openapi':176 'page':128,161 'paramet':194 'part':48 'pay':10,24,59 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':58 'payment':44,79 'per':11,25,60,118 'platform':52,125 'post':92 'premium':35 'price':134 'prompt':168 'protocol':45 'provid':33 'rate':144 'render':163 'request':61,93,119 'request/response':179 'requir':150 'resourc':189 'return':95,191 'schema':177 'send':218 'servic':72 'settl':80 'span':63 'spars':154 'specif':88 'substant':171 'unit':108 'usdc':14,28,82,110,120 'usdc-settlement' 'use':121 'util':71 'varieti':56 'via':41 'wallet':167 'x402':2,16,43,76,98 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"297e5f63-73d5-4e6f-8d35-bb689b1f6be0","listingId":"38f03697-21c8-4694-a29e-6ee64374cf11","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/58/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":"2026-04-18T18:39:52.317Z"}],"sources":[{"listingId":"38f03697-21c8-4694-a29e-6ee64374cf11","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/58/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:52.317Z","lastSeenAt":"2026-04-28T07:04:58.361Z"}],"details":{"listingId":"38f03697-21c8-4694-a29e-6ee64374cf11","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/58/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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/58/balance"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information via a single paid API call","Integrating pay-per-request balance lookups into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing simple pay-per-call API access without API keys","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone needing account balance data for a specific, well-known financial platform (the data source is unclear)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.737Z"},"updatedAt":"2026-04-28T07:04:58.361Z"}}