{"id":"5fe61498-f4cb-4a55-bd00-58b06d45136f","shortId":"xKjvtq","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/132/balance` is described as \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated 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 minimum commitments required.\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 detailed documentation for what the account balance endpoint actually returns or what parameters it accepts. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to use without experimentation.","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","lowpaymentfee","pay-per-request API","Base network API","crypto payment API"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request parameters and response format are unknown","The specific endpoint path '/api/v1/accounts/132/balance' includes a hardcoded account ID (132); unclear if this is parameterizable","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/132/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/132/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. No OpenAPI schema, no request/response examples, and no description of what the account balance endpoint actually returns or accepts. The listing is effectively a 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'0.02':73,127 '000':77 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':67 '20':76 '402':197 '6':81 'Base network API' 'USDC micropayment API' 'accept':54,188 'access':52 'account':4,18,35,179 'account balance API' 'account-balance' 'actual':182 'advertis':87 'ai/ml':98 'analysi':101 'analyt':97 'api':51,94,132,148 'balanc':5,19,36,180 'base':8,22,62,78 'base-network' 'broader':84 'call':12,26 'challeng':199 'classif':103 'commit':140 'confirm':192 'connect':157 'content':163 'contract':66 'convers':120 'cost':71 'crypto payment API' 'data':96,106 'decim':82 'describ':48 'detail':174 'difficult':207 'doc':147 'document':142,175,204 'embed':104 'endpoint':6,20,30,123,181,190 'estim':114 'exampl':171 'exchang':109 'experiment':211 'extrem':144 'feed':108 'finance/crypto':105 'gas':113 'gate':3,17,93 'generat':121 'geocod':118 'infer':99 'infrastructur':116 'key':133 'lack':202 'limit':136 'list':125 'live':193 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,85 'make':205 'maximum':70 'minimum':139 'network':63 'no-api-key' 'openapi':167 'page':152 'paramet':186 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':41,57 'per':11,25,74,128 'platform':86 'post':55 'premium':50 'price':107,149 'prompt':159 'proper':196 'protocol':42 'provid':33 'quot':112 'rate':110,135 'readm':151 'render':154 'request':56,75,129 'request/response':170 'requir':141 'resourc':45 'return':183,194 'schema':168 'sentiment':100 'settl':59 'span':95 'spars':145 'specif':44 'suit':89 'summar':102 'token':111 'unit':79 'usdc':14,28,65 'usdc-settlement' 'use':64,209 'util':117 'valid':119 'via':38 'wallet':158 'without':210 'x402':2,16,40,92,198 'x402 API' 'x402-gated':1,15,91 'x402-payment'","prices":[{"id":"609e31cd-8ab5-4000-b29f-e6f2d5fc291a","listingId":"5fe61498-f4cb-4a55-bd00-58b06d45136f","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/132/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":"2026-04-18T18:40:55.835Z"}],"sources":[{"listingId":"5fe61498-f4cb-4a55-bd00-58b06d45136f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/132/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:55.835Z","lastSeenAt":"2026-04-27T22:03:23.100Z"}],"details":{"listingId":"5fe61498-f4cb-4a55-bd00-58b06d45136f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/132/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/accounts/132/balance"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/132/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Agent-driven API access without pre-registration or API keys","Programmatic balance lookups settled on Base L2"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can handle x402 payment challenges natively","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.724Z"},"updatedAt":"2026-04-27T22:03:23.100Z"}}