{"id":"831ca409-6193-4d31-80fe-b0d95e44685a","shortId":"zeaGaf","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\" resource at `/api/v1/accounts/72/balance`, gated behind the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access via x402 on the Base network.\n\nHowever, the specific endpoint being listed here (`/api/v1/accounts/72/balance`) is not explicitly documented on the site's landing page among the advertised APIs. Its purpose — presumably returning an account balance — is inferred from the URL path. No request/response schema, documentation, or examples are available beyond the x402 challenge metadata. The docs, pricing, API, and README pages all resolve to a minimal \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","account-balance","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 paid endpoint","USDC micropayment API","Base network API","lowpaymentfee","pay-per-request API","crypto-gated API"],"warnings":["The endpoint /api/v1/accounts/72/balance is not listed among the site's advertised APIs — its purpose is inferred from the URL path only.","No request body schema or response schema is documented anywhere.","All documentation pages (docs, pricing, API, README) resolve to a minimal 'Connect wallet' prompt with no useful content.","The hardcoded account ID '72' in the path suggests this may be a specific resource rather than a general-purpose API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/72/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/72/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/request in USDC on Base), but there is no documentation, no request/response schema, no examples, and the specific endpoint path is not listed among the site's advertised APIs. Docs pages are empty stubs. This is effectively a stub 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'0.02':77,126 '000':72 '0x8335':64 '20':71 '2913':65 '6':82 'Base network API' 'USDC micropayment API' 'accept':48 'access':37,140 'account':4,18,174 'account balance API' 'account-balance' 'addit':212 'advertis':88,167 'ai/ml':100 'among':165 'amount':69 'analysi':102 'analyt':99 'api':36,96,133,168,198 'avail':189 'balanc':5,19,175 'base':8,22,59,73,145 'behind':42 'beyond':190 'broader':85 'call':12,26,95 'challeng':193 'classif':104 'connect':207 'content':213 'contract':63 'convers':121 'crypto-gated API' 'data':98 'decim':83 'doc':196 'document':158,185 'embed':105 'emphas':131 'endpoint':6,20,30,150 'equal':76 'estim':115 'exampl':187 'exchang':110 'explicit':157 'feed':109 'financ':106 'gas':114 'gate':3,17,41 'generat':122 'geocod':119 'howev':147 'infer':177 'infrastructur':117 'instant':139 'json':53 'json-response' 'key':134 'land':163 'limit':137 'list':152 'lowpaymentfee' 'lowpaymentfee.com':32,86 'maximum':68 'metadata':194 'minim':206 'network':60,146 'no-api-key' 'page':164,201 'path':181 'pay':10,24,93 'pay-per-cal':9,23,92 'pay-per-call' 'pay-per-request API' 'payment':45,54 'per':11,25,78,94,127 'platform':87,130 'post':49 'premium':35 'presum':171 'price':108,124,197 'prompt':209 'protocol':46 'provid':33 'purpos':170 'quot':113 'rate':111,136 'readm':200 'request':50,79,128 'request/response':183 'resolv':203 'resourc':38 'return':52,172 'schema':184 'sentiment':101 'settl':56 'site':161 'span':97 'specif':149 'suit':90 'summar':103 'token':112 'unit':74 'url':180 'usdc':14,28,62,80 'usdc-base' 'use':61,81 'util':118 'valid':120 'via':141 'wallet':208 'web3':107 'x402':2,16,44,142,192 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"4452917f-7290-4c61-8b31-19e2274be734","listingId":"831ca409-6193-4d31-80fe-b0d95e44685a","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/72/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":"2026-04-18T18:40:03.103Z"}],"sources":[{"listingId":"831ca409-6193-4d31-80fe-b0d95e44685a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/72/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:03.103Z","lastSeenAt":"2026-04-28T05:33:51.618Z"}],"details":{"listingId":"831ca409-6193-4d31-80fe-b0d95e44685a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/72/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 returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/72/balance"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/72/balance"}],"useCases":["Querying an account balance via a pay-per-call x402 endpoint","Integrating micropayment-gated data retrieval into agent workflows","Demonstrating x402 protocol usage on the Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need pay-per-call access without API key management","Low-cost per-request data retrieval on Base"],"notFor":["Production use cases requiring documented request/response schemas","High-volume batch queries where per-call pricing is inefficient","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.206Z"},"updatedAt":"2026-04-28T05:33:51.618Z"}}