{"id":"40688d7a-a0b7-40bf-ae19-538d379ee600","shortId":"YgaKUF","kind":"x402","title":"Check account balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Check account balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides account balance information behind an x402 paywall. The specific resource `/api/v1/accounts/78/balance` accepts POST requests and returns JSON. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted per-request via the x402 payment protocol.\n\nThe provider lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (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 listed at $0.02 per request with the same x402 payment model on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the balance endpoint accepts or returns. The endpoint is confirmed live (returns a proper 402 challenge), but the actual functionality behind the paywall is opaque from available materials.","tags":[],"capabilities":["x402-payment","account-balance","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No OpenAPI schema or request/response documentation available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content","The specific purpose and data returned by /api/v1/accounts/78/balance is unclear — 'Premium API Access' is a generic label","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/78/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/78/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no request/response examples, and no meaningful documentation beyond a landing page listing. The actual functionality behind the paywall cannot be verified from available materials, making this effectively a stub 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'0.02':11,24,59,132 '000':63 '20':62 '402':194 '6':67 'Base network API' 'USDC pay-per-call' 'accept':43,183 'access':77 'account':2,15,32 'account balance API' 'account-balance' 'actual':198 'ai/ml':104 'analysi':107 'analyt':103 'api':70,100,149 'avail':206 'balanc':3,16,33,181 'base':8,21,56,64,142 'behind':35,200 'broader':93 'call':61,99 'challeng':195 'check':1,14 'classif':109 'confirm':189 'connect':158 'convers':125 'crypto payment API' 'data':102 'decim':68 'descript':176 'detail':165 'doc':148 'document':143 'embed':110 'endpoint':28,128,182,187 'estim':119 'exampl':173 'exchang':114 'extrem':145 'feed':113 'field':179 'finance/web3':111 'function':199 'gas':118 'generat':126 'geocod':123 'grant':79 'host':91 'infer':105 'inform':34 'infrastructur':121 'json':48 'json-response' 'key':71 'limit':74 'list':130 'live':190 'lowpaymentfee' 'lowpaymentfee.com':30,90 'materi':207 'micropay':6,19 'micropayment API' 'model':140 'network':9,22,57 'no-api-key' 'opaqu':204 'openapi':169 'page':153 'pay':97 'pay-per-cal':96 'pay-per-request' 'payment':49,86,139 'paywal':38,202 'per':12,25,60,81,98,133 'per-request':80 'post':44 'price':112,150 'prompt':160 'proper':193 'protocol':87 'provid':31,89 'quot':117 'rate':73,115 'readm':152 'render':155 'request':13,26,45,82,134 'request/response':172 'requir':76 'resourc':41 'return':47,185,191 'schema':170 'sentiment':106 'settl':51 'span':101 'spars':146 'specif':40 'suit':94 'summar':108 'technic':164 'token':116 'unit':65 'usdc':53 'usdc-base-network' 'util':122 'valid':124 'via':4,17,83 'wallet':159 'x402':5,18,37,85,138 'x402 balance check' 'x402-payment'","prices":[{"id":"61b3a124-7888-4639-a0be-ebd1a302be7a","listingId":"40688d7a-a0b7-40bf-ae19-538d379ee600","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/78/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":"2026-04-18T18:40:07.861Z"}],"sources":[{"listingId":"40688d7a-a0b7-40bf-ae19-538d379ee600","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/78/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:07.861Z","lastSeenAt":"2026-04-30T23:04:11.255Z"}],"details":{"listingId":"40688d7a-a0b7-40bf-ae19-538d379ee600","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/78/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/accounts/78/balance"},{"claim":"All APIs listed at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/78/balance"}],"useCases":["Querying account balance information programmatically with per-request USDC payment","Integrating balance checks into agent workflows without managing API keys","Paying for individual API calls on Base L2 without subscriptions"],"bestFor":["Agents or apps that need on-demand account balance data with no subscription commitment","Developers experimenting with x402 micropayment protocols","Use cases requiring keyless, pay-as-you-go API access on Base"],"notFor":["Users needing detailed API documentation or schema guarantees before paying","High-volume balance queries where per-request pricing may add up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.995Z"},"updatedAt":"2026-04-30T23:04:11.255Z"}}