{"id":"c244fa47-e750-480c-8a36-fd008826defc","shortId":"nVLMcx","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/7/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 site-wide $0.02/request pricing advertised by the provider.\n\nThe provider, lowpaymentfee.com, hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and utility services — all priced at $0.02 per request and settled in USDC on Base. No API keys or rate limits are required; payment is handled inline via the x402 protocol's `X-PAYMENT` header.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the balance response payload looks like. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what input the POST body expects or what shape the response takes beyond `application/json`.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-request API","Base network API","lowpaymentfee","402 payment endpoint"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema available — request body format and response shape are unknown.","The specific endpoint path '/api/v1/accounts/7/balance' with a hardcoded account ID '7' is unusual and its purpose is unclear.","This endpoint is not listed on the provider's homepage catalog, raising questions about its intended use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/7/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/7/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 with clear pricing. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint returns. The listing is a stub with pricing info 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'/request':85 '0.02':74,84,123 '000':69 '20':68 '402':201 '402 payment endpoint' 'Base network API' 'USDC micropayment API' 'account':4,18,35 'account balance API' 'account-balance' 'advertis':87 'ai/ml':107 'analysi':110 'analyt':106 'api':103,133,159 'application/json':222 'balanc':5,19,36,189 'base':8,22,58,70,131 'base-network' 'behind':49 'beyond':221 'bodi':213 'broader':96 'call':12,26,102 'catalog':97 'challeng':62,202 'classif':112 'connect':168 'consist':78 'content':174 'cost':66 'data':105,115 'descript':185 'doc':158 'document':153,205 'embed':113 'endpoint':6,20,30,195 'exampl':182 'expect':214 'extrem':155 'feed':116 'finance/crypto':114 'gate':3,17,48 'handl':142 'header':152 'host':94 'indic':63 'infer':108 'inlin':143 'input':210 'key':134 'like':193 'limit':137 'live':197 'look':192 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,93 'maximum':65 'network':59 'no-api-key' 'openapi':178 'page':163 'pay':10,24,100 'pay-per-cal':9,23,99 'pay-per-call' 'pay-per-request API' 'payload':191 'payment':41,55,140,151 'per':11,25,52,76,101,124 'per-request':51 'post':212 'price':86,121,160 'prompt':170 'protocol':42,147 'provid':33,90,92 'rate':136 'readm':162 'render':165 'request':53,77,125 'request/response':181 'requir':139 'resourc':45 'respons':190,219 'return':198 'schema':179 'sentiment':109 'servic':119 'settl':127 'shape':217 'site':82 'site-wid':81 'span':104 'spars':156 'specif':44 'summar':111 'take':220 'unclear':208 'unit':71 'usd':75 'usdc':14,28,54,73,129 'usdc-settlement' 'util':118 'valid':200 'via':38,144 'wallet':169 'wide':83 'without':204 'x':150 'x-payment':149 'x402':2,16,40,61,146 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f5e32811-08cb-4f76-a141-496f06d6288f","listingId":"c244fa47-e750-480c-8a36-fd008826defc","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/7/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":"2026-04-18T18:40:01.312Z"}],"sources":[{"listingId":"c244fa47-e750-480c-8a36-fd008826defc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/7/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:01.312Z","lastSeenAt":"2026-04-28T05:33:51.491Z"}],"details":{"listingId":"c244fa47-e750-480c-8a36-fd008826defc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/7/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 the Base network, equating to $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/accounts/7/balance"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers APIs across data analytics, AI/ML, finance/crypto, and infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, API, pricing, and README pages render only a 'Connect wallet' prompt with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data via a single paid API call","Demonstrating x402 protocol payment flow for agent-to-agent commerce","Integrating low-cost per-request financial data lookups without API key management"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents needing keyless, pay-per-call account balance lookups","Projects that want to avoid subscription commitments for infrequent API calls"],"notFor":["Production use cases requiring well-documented request/response schemas","High-volume balance queries where per-call pricing adds up","Users who need non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.304Z"},"updatedAt":"2026-04-28T05:33:51.491Z"}}