{"id":"e6427f94-b97e-4648-b861-a624a623b072","shortId":"hZEk7C","kind":"x402","title":"Check account balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Check account balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides account balance information behind an x402 paywall. The specific resource `/api/v1/accounts/103/balance` accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and infrastructure utilities. All endpoints share the same $0.02/request pricing model and x402 payment flow on Base. However, the specific endpoint being listed here is the account balance lookup under `/api/v1/accounts/103/balance`.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact fields returned by this balance endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto balance lookup"],"warnings":["No OpenAPI or schema documentation available — request body and response format are completely unknown","All documentation pages (/docs, /api, /pricing, /README) return only a 'Connect wallet' prompt with no content","The specific meaning of 'accounts/103/balance' is unclear — it is unknown what account 103 represents or whether the account ID is parameterizable","The broader platform lists many endpoint categories (AI, analytics, finance, utilities) all at $0.02, but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/103/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/103/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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The purpose of this specific endpoint (account 103 balance) is vague with no context on what 'account 103' refers to. Effectively a stub 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'/api/v1/accounts/103/balance':42,148 '/docs':158 '/pricing':160 '/readme':162 '/request':126 '0.02':11,24,59,125 '000':63 '20':62 '6':67 'Base network API' 'USDC pay-per-call' 'accept':43 'account':2,15,32,144 'account balance API' 'account-balance' 'ai/ml':107 'analysi':110 'analyt':106 'api':70,103 'attach':79 'avail':188 'balanc':3,16,33,145,198 'base':8,21,56,64,134 'behind':35 'beyond':150 'broader':96 'call':61,102 'caller':77 'check':1,14 'classif':112 'connect':168 'content':174 'crawl':191 'crypto balance lookup' 'data':105,116 'decim':68 'document':149,183 'embed':113 'endpoint':28,121,138,199 'exact':193 'exampl':187 'extrem':155 'field':194 'finance/crypto':114 'flow':132 'header':84 'host':94 'howev':135 'infer':108 'inform':34 'infrastructur':118 'json':48 'json-response' 'key':71 'land':152 'limit':74 'list':140 'lookup':146 'lowpaymentfee' 'lowpaymentfee.com':30,93 'market':115 'micropay':6,19 'micropayment API' 'model':128 'network':9,22,57 'no-api-key' 'openapi':178 'page':153,163 'pay':100 'pay-per-cal':99 'pay-per-request' 'payment':49,83,89,131 'paywal':38 'per':12,25,60,101 'post':44 'price':127 'prompt':170 'proof':90 'provid':31,92 'rate':73 'render':165 'request':13,26,45 'request/response':181 'requir':76 'resourc':41 'return':47,195 'schema':182 'sentiment':109 'settl':51 'share':122 'simpli':78 'span':104 'spars':156 'spec':179 'specif':40,137 'substant':173 'suit':97 'summar':111 'unit':65 'unknown':201 'usag':186 'usdc':53 'usdc-base-network' 'util':119 'valid':87 'via':4,17 'wallet':169 'x':82 'x-payment':81 'x402':5,18,37,88,130 'x402 balance check' 'x402-payment'","prices":[{"id":"8aa8dd1b-eb2d-4ee2-b879-77a2d9e1d71d","listingId":"e6427f94-b97e-4648-b861-a624a623b072","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/103/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":"2026-04-18T18:40:37.659Z"}],"sources":[{"listingId":"e6427f94-b97e-4648-b861-a624a623b072","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/103/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:37.659Z","lastSeenAt":"2026-04-27T22:32:47.327Z"}],"details":{"listingId":"e6427f94-b97e-4648-b861-a624a623b072","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/103/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/103/balance"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/103/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":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance information programmatically with per-call USDC micropayments","Integrating balance checks into agent workflows without managing API keys","Demonstrating x402 payment protocol usage on Base network"],"bestFor":["Developers experimenting with x402 protocol payments","Agents needing keyless, pay-per-call balance lookups","Low-volume or sporadic balance queries where subscription pricing is overkill"],"notFor":["High-volume balance polling where $0.02/request adds up quickly","Users who need detailed documentation or guaranteed SLAs","Querying balances on networks other than Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.548Z"},"updatedAt":"2026-04-27T22:32:47.327Z"}}