{"id":"81d9e359-c564-42a0-97d9-3a40de0534c4","shortId":"2bKFV6","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 an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/53/balance` is gated behind a per-request USDC micropayment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), settled to an on-chain address. The endpoint accepts POST requests and returns JSON.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol on Base.\n\nHowever, the specific endpoint being listed here (`/api/v1/accounts/53/balance`) is not documented on the site's landing page among the advertised APIs. Its purpose appears to be retrieving the balance for account ID 53, but no further documentation, request/response schemas, or examples are available. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","account-balance","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","402 payment required","crypto payment API"],"warnings":["This specific endpoint (/api/v1/accounts/53/balance) is not listed among the site's advertised APIs — its purpose and output are unverified.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No request body schema or response schema is available; example_request_json and example_response_json are null.","The endpoint appears to be hardcoded to account ID 53; it is unclear if other account IDs are supported or what 'accounts' refers to in this context."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/53/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/53/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), but this specific endpoint is not documented among the site's advertised APIs. No request/response schema, no examples, and all doc pages render only 'Connect wallet'. The endpoint's actual functionality is unclear beyond the path-implied 'account balance' 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'0.02':74,138 '000':69 '20':68 '402 payment required' '53':194 'Base network API' 'USDC pay-per-call' 'accept':87 'account':4,18,35,192 'account balance API' 'account-balance' 'addit':220 'address':84 'advertis':97,181 'ai/ml':109 'among':179 'analysi':112 'analyt':108 'api':105,143,182,209 'appear':185 'avail':204 'balanc':5,19,36,190 'base':8,22,58,70,161 'base-network' 'behind':49 'broader':94 'call':12,26,104 'chain':83 'challeng':62 'classif':114 'commit':150 'connect':215 'content':221 'convers':131 'cost':66 'crypto payment API' 'data':107,117 'doc':206 'document':172,198 'embed':115 'endpoint':6,20,30,86,134,165 'entir':155 'estim':125 'exampl':202 'exchang':120 'feed':119 'finance/crypto':116 'gas':124 'gate':3,17,48 'generat':132 'geocod':129 'handl':154 'howev':162 'id':193 'indic':63 'infer':110 'infrastructur':127 'json':92 'key':144 'land':177 'limit':147 'list':136,167 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,95 'maximum':65 'micropay':55 'network':59 'no-api-key' 'on-chain':81 'page':178,210 'pay':10,24,102 'pay-per-cal':9,23,101 'pay-per-call' 'payment':41,152 'per':11,25,52,76,103,139 'per-request':51 'platform':96 'post':88 'price':118,207 'prompt':217 'protocol':42,159 'provid':33 'purpos':184 'quot':123 'rate':121,146 'render':212 'request':53,77,89,140 'request/response':199 'requir':151 'resourc':45 'retriev':188 'return':91 'schema':200 'sentiment':111 'settl':78 'site':175 'span':106 'specif':44,164 'suit':99 'summar':113 'token':122 'unit':71 'usd':75 'usdc':14,28,54,73 'usdc-micropayment' 'util':128 'valid':130 'via':38,156 'wallet':216 'x402':2,16,40,61,158 'x402 micropayment' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1afa89ca-74c3-44bb-a41e-e55cd9924d58","listingId":"81d9e359-c564-42a0-97d9-3a40de0534c4","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/53/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":"2026-04-18T18:39:49.275Z"}],"sources":[{"listingId":"81d9e359-c564-42a0-97d9-3a40de0534c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/53/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:49.275Z","lastSeenAt":"2026-04-28T06:33:39.770Z"}],"details":{"listingId":"81d9e359-c564-42a0-97d9-3a40de0534c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/53/balance \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","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 of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/53/balance"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/53/balance"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance for account 53 via a single micropayment","Demonstrating x402 protocol integration for agent-to-API payments","Building pay-as-you-go workflows that settle in USDC on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need to make authenticated-by-payment API calls","Use cases requiring no API key or subscription management"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or batch account balance queries across many accounts","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.9Z"},"updatedAt":"2026-04-28T06:33:39.770Z"}}