{"id":"6e4821d9-b941-4ab1-927b-4db19acba648","shortId":"P2Uzcz","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/51/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per request), consistent with the provider's advertised flat $0.02/request pricing across all their API endpoints.\n\nThe provider lowpaymentfee.com hosts a broader suite of x402-gated 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 endpoints are priced at $0.02 per request, require no API keys, and claim no rate limits. Payments settle in USDC on the Base L2 network.\n\nThis particular endpoint (`/accounts/51/balance`) appears to be an account-specific balance query. The crawled documentation pages were largely empty (showing only a \"Connect wallet\" prompt), so details about request parameters, response format, and the nature of the \"account\" being queried are not documented in the available material. The endpoint accepts POST requests and returns `application/json`.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["account balance API","x402 balance endpoint","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee API","crypto payment gated API"],"warnings":["No API documentation available — all doc pages show only 'Connect wallet' with no content","Request body schema and response format are completely undocumented","The nature of 'account 51' and what 'balance' refers to is unexplained","No OpenAPI or machine-readable schema provided by the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/51/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/51/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation on request/response schemas, no OpenAPI spec, and the docs/pricing/README pages are all blank beyond a wallet connect prompt. The specific purpose of this account balance endpoint is 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'/api/v1/accounts/51/balance':46 '/request':86 '0.02':74,85,136 '000':69 '20':68 'Base network API' 'USDC micropayment API' 'accept':207 'account':4,18,35,166,195 'account balance API' 'account-balance' 'account-specif':165 'across':88 'advertis':83 'ai/ml':108 'analysi':110 'analyt':107 'api':91,104,141 'appear':161 'application/json':212 'avail':203 'balanc':5,19,36,168 'base':8,22,58,70,154 'base-network' 'behind':49 'broader':98 'call':12,26 'challeng':62 'claim':144 'classif':112 'connect':180 'consist':78 'convers':129 'cost':66 'crawl':171 'crypto payment gated API' 'data':106 'detail':184 'document':172,200 'embed':113 'empti':176 'endpoint':6,20,30,92,132,159,206 'estim':123 'exchang':118 'feed':117 'financ':114 'flat':84 'format':189 'gas':122 'gate':3,17,48,103 'generat':130 'geocod':127 'host':96 'indic':63 'infrastructur':125 'json-response' 'key':142 'l2':155 'larg':175 'limit':147 'lookup':37 'lowpaymentfee API' 'lowpaymentfee.com':32,95 'materi':204 'maximum':65 'natur':192 'network':59,156 'no-api-key' 'page':173 'paramet':187 'particular':158 'pay':10,24 'pay-per-cal':9,23 'pay-per-call balance' 'pay-per-request' 'payment':41,55,148 'per':11,25,52,76,137 'per-request':51 'post':208 'price':87,116,134 'prompt':182 'protocol':42 'provid':33,81,94 'queri':169,197 'quot':121 'rate':119,146 'request':53,77,138,186,209 'requir':139 'resourc':45 'respons':188 'return':211 'sentiment':109 'settl':149 'show':177 'span':105 'specif':44,167 'suit':99 'summar':111 'token':120 'unit':71 'usd':75 'usdc':14,28,54,73,151 'usdc-settlement' 'util':126 'valid':128 'via':38 'wallet':181 'web3':115 'x402':2,16,40,61,102 'x402 balance endpoint' 'x402-gated':1,15,101 'x402-payment'","prices":[{"id":"078807b5-f0ac-477b-b4f0-d57b6abc6594","listingId":"6e4821d9-b941-4ab1-927b-4db19acba648","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/51/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":"2026-04-18T18:39:47.451Z"}],"sources":[{"listingId":"6e4821d9-b941-4ab1-927b-4db19acba648","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/51/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:47.451Z","lastSeenAt":"2026-04-29T05:33:53.428Z"}],"details":{"listingId":"6e4821d9-b941-4ab1-927b-4db19acba648","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/51/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 requires a maximum of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/51/balance"},{"claim":"All endpoints 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 provider offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information with per-request USDC micropayments","Integrating pay-as-you-go balance lookups into agent workflows","Accessing financial data without API key registration"],"bestFor":["Agents needing on-demand account balance data without subscription commitments","Developers testing x402 payment protocol integrations","Low-volume, pay-per-use balance queries"],"notFor":["High-volume balance polling where per-request fees add up","Users who need detailed API documentation before integrating","Anyone without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.97Z"},"updatedAt":"2026-04-29T05:33:53.428Z"}}