{"id":"d1f8ecd6-5334-4a0c-bbc9-0201f2d8ed0f","shortId":"NxTX5m","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 returns account balance information for a specific account (ID 174) behind an x402 paywall. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The x402 challenge specifies an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are advertised; access is gated purely by per-request micropayment.\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 confirmed live (returns 402 with a well-formed x402 challenge), but the actual functionality behind the paywall cannot be verified from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","per-request-micropayment","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content.","No OpenAPI or request/response schema available; payload structure is unknown.","The endpoint path references a hardcoded account ID (174), which may be a demo or placeholder rather than a general-purpose API.","Actual functionality behind the paywall cannot be verified without payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/174/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/174/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 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific '/accounts/174/balance' path is unclear and may be a demo or 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'000':117 '0x8335':122 '174':40 '20':116 '2913':123 '402':198 '6':132 'Base network API' 'USDC pay-per-call' 'accept':78 'access':142 'account':2,15,32,38 'account balance API' 'account-balance' 'actual':208 'advertis':141 'ai/ml':55 'analyt':54 'api':61,135,157 'avail':217 'balanc':3,16,33,187 'base':8,21,74,118,125 'behind':41,210 'broader':50 'caller':91 'cannot':213 'challeng':106,205 'check':1,14 'confirm':195 'connect':166 'content':172 'crypto payment API' 'data':53 'decim':133 'descript':183 'doc':156 'document':151 'endpoint':28,77,193 'equal':127 'exact':110 'exact-schem':109 'exampl':180 'extrem':153 'finance/web3':57 'form':203 'function':209 'gate':144 'given':129 'handl':86 'header':98 'id':39 'includ':93 'infer':56 'inform':34 'infrastructur':59 'json':83 'json-response' 'key':136 'like':191 'limit':139 'live':196 'look':190 'lowpaymentfee' 'lowpaymentfee.com':30 'materi':218 'micropay':6,19,150 'micropayment API' 'must':92 'network':9,22,75 'no-api-key' 'offer':52 'openapi':176 'page':161 'part':47 'payload':189 'payment':84,97,102,112 'paywal':44,212 'per':12,25,66,148 'per-request':147 'per-request-micropayment' 'platform':51 'post':79 'price':63,158 'prompt':168 'proof':103 'protocol':90 'pure':145 'rate':138 'readm':160 'render':163 'request':13,26,67,80,149 'request/response':179 'respons':188 'return':31,82,197 'schema':177 'scheme':111 'settl':69 'spars':154 'specif':37 'specifi':107 'unit':119 'usdc':71,121,130 'usdc-base' 'util':60 'valid':101 'verifi':215 'via':4,17,87 'wallet':167 'well':202 'well-form':201 'x':96 'x-payment':95 'x402':5,18,43,89,105,204 'x402 balance check' 'x402-payment'","prices":[{"id":"8b789cee-31fa-4c47-af00-cde66d68a83d","listingId":"d1f8ecd6-5334-4a0c-bbc9-0201f2d8ed0f","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/174/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":"2026-04-18T18:41:33.751Z"}],"sources":[{"listingId":"d1f8ecd6-5334-4a0c-bbc9-0201f2d8ed0f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/174/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:33.751Z","lastSeenAt":"2026-04-27T18:07:21.375Z"}],"details":{"listingId":"d1f8ecd6-5334-4a0c-bbc9-0201f2d8ed0f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/174/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/174/balance"},{"claim":"All APIs on the platform 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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/174/balance"}],"useCases":["Querying account balance data behind a per-request micropayment wall","Demonstrating x402 protocol integration for pay-per-call APIs","Building agent workflows that pay for data access in USDC on Base"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents needing low-cost, keyless API access on Base","Projects requiring pay-per-use balance lookups without subscriptions"],"notFor":["Production use cases requiring documented request/response schemas","High-volume balance queries where per-call pricing adds up","Users who need traditional API-key authentication or OAuth"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.878Z"},"updatedAt":"2026-04-27T18:07:21.375Z"}}