{"id":"2db171b5-3dee-4adf-93e3-7ebe5a0a9ad7","shortId":"WqttvS","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/9/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 site-wide $0.02/request pricing model. The endpoint accepts POST requests and returns JSON.\n\nThe broader lowpaymentfee.com platform advertises a 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 share the same $0.02/request pricing with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol using USDC on Base.\n\nDocumentation 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 schema, no request/response examples, and no detailed description of what the account balance endpoint actually returns or what parameters it accepts. The endpoint is live (returns a valid 402 challenge), but the lack of documentation makes it difficult to assess the actual utility or data quality of the response.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key"],"categories":["finance"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","This specific endpoint (/api/v1/accounts/9/balance) is not listed among the provider's advertised API catalog","No examples of request or response payloads available","Cannot verify what data the endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/9/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/9/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 and returns a valid x402 402 challenge, confirming it is operational. However, documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the balance endpoint actually returns or what inputs it expects. The specific endpoint path (/api/v1/accounts/9/balance) is not listed among the provider's advertised APIs, raising questions about its intended 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'/request':87,142 '0.02':74,86,141 '000':69 '20':68 '402':221 'Base network API' 'USDC micropayment API' 'accept':92,213 'account':4,18,35,204 'account balance API' 'account-balance' 'actual':207,234 'advertis':102 'ai/ml':113 'analysi':115 'analyt':112 'api':109,146,173 'assess':232 'balanc':5,19,36,205 'base':8,22,58,70,166 'behind':49 'broader':99 'call':12,26 'challeng':62,222 'classif':117 'commit':153 'connect':182 'consist':78 'content':188 'convers':134 'cost':66 'data':111,237 'descript':200 'detail':199 'difficult':230 'doc':172 'document':167,227 'embed':118 'endpoint':6,20,30,91,137,206,215 'entir':158 'estim':128 'exampl':196 'exchang':123 'extrem':169 'feed':122 'financ':119 'gas':127 'gate':3,17,48,108 'generat':135 'geocod':132 'handl':157 'indic':63 'infrastructur':130 'json':97 'key':147 'lack':225 'limit':150 'live':217 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,100 'make':228 'maximum':65 'model':89 'network':59 'no-api-key' 'openapi':192 'page':177 'paramet':211 'pay':10,24 'pay-per-cal':9,23 'pay-per-call balance' 'pay-per-request' 'payment':41,55,155 'per':11,25,52,76 'per-request':51 'platform':101 'post':93 'price':88,121,143,174 'prompt':184 'protocol':42,162 'provid':33,81 'qualiti':238 'quot':126 'rate':124,149 'readm':176 'render':179 'request':53,77,94 'request/response':195 'requir':154 'resourc':45 'respons':241 'return':96,208,218 'schema':193 'sentiment':114 'share':138 'site':84 'site-wid':83 'span':110 'spars':170 'specif':44 'substant':187 'suit':104 'summar':116 'token':125 'unit':71 'usd':75 'usdc':14,28,54,73,164 'usdc-base' 'use':163 'util':131,235 'valid':133,220 'via':38,159 'wallet':183 'web3':120 'wide':85 'x402':2,16,40,61,107,161 'x402 balance check' 'x402-gated':1,15,106 'x402-payment'","prices":[{"id":"219608c8-004a-4b81-be7c-1bff29d12eb2","listingId":"2db171b5-3dee-4adf-93e3-7ebe5a0a9ad7","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/9/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":"2026-04-18T18:40:18.308Z"}],"sources":[{"listingId":"2db171b5-3dee-4adf-93e3-7ebe5a0a9ad7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/9/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:18.308Z","lastSeenAt":"2026-04-30T22:04:55.665Z"}],"details":{"listingId":"2db171b5-3dee-4adf-93e3-7ebe5a0a9ad7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/9/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 requires a maximum of 20,000 base units of USDC (USD Coin) on Base network, equivalent to $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/9/balance"},{"claim":"The provider advertises $0.02/request pricing 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/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data via a single paid API call","Integrating pay-per-request balance lookups into agent workflows","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing simple pay-per-call API access without API keys","Low-volume balance lookups where $0.02/call is acceptable"],"notFor":["High-volume balance queries where per-call costs add up","Users who need detailed API documentation before integrating","Production systems requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.515Z"},"updatedAt":"2026-04-30T22:04:55.665Z"}}