{"id":"3ab900f9-a60b-4f88-9e07-9b44a2f663c8","shortId":"jK2f2N","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 (account ID 187) behind an x402 paywall. It is part of a broader platform offering various pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — 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 decimal places. No API keys or rate limits are advertised; access is gated purely by 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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format and the meaning of the balance data are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema definition found for request or response payloads","The specific account ID (187) is hardcoded in the endpoint path; unclear if other account IDs are accessible","Purpose and data returned by the balance endpoint are entirely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/187/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/187/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'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific account balance endpoint is unclear. The listing is effectively a 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'000':125 '0x8335':130 '187':41 '20':124 '2913':131 '402':205 '6':140 'Base network API' 'USDC pay-per-call' 'accept':86 'access':151 'account':2,15,32,38,39 'account balance API' 'account-balance' 'actual':209 'advertis':150 'ai/ml':63 'analyt':62 'api':59,144,163 'avail':192 'balanc':3,16,33,217 'base':8,21,82,126,133 'base-network' 'behind':42 'broader':51 'call':58 'caller':99 'challeng':114,206 'check':1,14 'confirm':200 'connect':172 'content':178 'crawl':195 'crypto':66 'crypto payment API' 'data':61,218 'decim':141 'doc':162 'document':157,187 'endpoint':28,85,198 'equal':135 'exact':118 'exact-schem':117 'exampl':191 'extrem':159 'financ':65 'format':211 'gate':153 'given':137 'handl':94 'header':106 'id':40 'includ':101 'infer':64 'inform':34 'json':91 'key':145 'limit':148 'live':201 'lowpaymentfee' 'lowpaymentfee.com':30 'materi':196 'mean':214 'micropay':6,19,156 'micropayment API' 'must':100 'network':9,22,83 'no-api-key' 'offer':53 'openapi':182 'page':167 'part':48 'pay':56 'pay-per-cal':55 'pay-per-call' 'payment':92,105,110,120 'paywal':45 'per':12,25,57,74 'place':142 'platform':52 'post':87 'price':71,164 'prompt':174 'proof':111 'proper':204 'protocol':98 'pure':154 'rate':147 'readm':166 'render':169 'request':13,26,75,88 'request/response':185 'respons':210 'return':31,90,202 'schema':186 'scheme':119 'servic':69 'settl':77 'span':60 'spars':160 'spec':183 'specif':37 'specifi':115 'unit':127 'unknown':220 'usag':190 'usdc':79,129,138 'usdc-settlement' 'util':68 'valid':109 'various':54 'via':4,17,95 'wallet':173 'x':104 'x-payment':103 'x402':5,18,44,97,113 'x402 balance check' 'x402-payment'","prices":[{"id":"53f3507f-5575-42ac-aee3-60e94a10dad6","listingId":"3ab900f9-a60b-4f88-9e07-9b44a2f663c8","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/187/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":"2026-04-18T18:41:36.157Z"}],"sources":[{"listingId":"3ab900f9-a60b-4f88-9e07-9b44a2f663c8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/187/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:36.157Z","lastSeenAt":"2026-04-27T18:07:21.530Z"}],"details":{"listingId":"3ab900f9-a60b-4f88-9e07-9b44a2f663c8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/187/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 challenge with x402Version 1, exact scheme, on Base network, with maxAmountRequired of 20000 base units of USDC","source_url":"https://lowpaymentfee.com/api/v1/accounts/187/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":"The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base (6 decimals), so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data programmatically with per-call USDC micropayments","Integrating balance lookups into agent workflows without managing API keys","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need keyless, pay-per-call API access on Base","Quick one-off balance checks without subscription commitments"],"notFor":["Production use cases requiring documented request/response schemas","High-volume balance monitoring where per-call fees add up","Users who need fiat payment options (only USDC on Base is accepted)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.735Z"},"updatedAt":"2026-04-27T18:07:21.530Z"}}