{"id":"1733be60-8015-4bb5-b4ba-a15520547eb7","shortId":"A99TTu","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 157) behind an x402 paywall. It is part of a broader platform offering numerous pay-per-call API endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories, 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 micropayment.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the balance response contains. The endpoint is live (returns a proper 402 challenge), but the actual functionality and response format must be inferred from the endpoint path alone.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee API","crypto payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content","No OpenAPI or schema definition; request body and response format are completely unknown","The specific endpoint path (/accounts/157/balance) suggests a hardcoded account ID — unclear if this is a demo or a real resource","Platform lists many endpoints but none appear to have public documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/157/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/157/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, confirming it is operational. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The actual response format and functionality are entirely unknown beyond the path name. This is effectively a stub 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'/docs':169 '/pricing':170 '/readme':173 '0.02':11,24,72,135 '000':124 '0x8335':129 '157':41 '20':123 '2913':130 '402':211 '6':139 'Base network API' 'USDC micropayment API' 'accept':85 'access':149 'account':2,15,32,38,39 'account balance API' 'account-balance' 'across':61 'actual':215 'advertis':148 'ai/ml':64 'alon':227 'analyt':63 'api':59,142 'avail':163 'balanc':3,16,33,201 'base':8,21,81,125,132 'behind':42 'broader':51 'call':58 'caller':98 'categori':68 'challeng':113,212 'check':1,14 'connect':179 'contain':203 'content':185 'crypto payment API' 'data':62 'decim':140 'descript':197 'detail':196 'document':155 'endpoint':28,60,84,164,205,225 'equal':134 'exact':117 'exact-schem':116 'exampl':193 'extrem':157 'finance/web3':65 'format':219 'function':216 'gate':151 'given':136 'handl':93 'header':105 'id':40 'includ':100 'infer':222 'inform':34 'infrastructur':67 'json':90 'json-response' 'key':143 'land':160 'limit':146 'list':162 'live':207 'lowpaymentfee API' 'lowpaymentfee.com':30 'micropay':6,19,154 'must':99,220 'network':9,22,82 'no-api-key' 'numer':54 'offer':53 'openapi':189 'page':161,174 'part':48 'path':226 'pay':56 'pay-per-cal':55 'pay-per-call balance' 'pay-per-request' 'payment':91,104,109,119 'paywal':45 'per':12,25,57,73 'platform':52 'post':86 'price':70,166 'prompt':181 'proof':110 'proper':210 'protocol':97 'pure':152 'rate':145 'render':176 'request':13,26,74,87 'request/response':192 'respons':202,218 'return':31,89,208 'schema':190 'scheme':118 'settl':76 'spars':158 'specif':37 'specifi':114 'substant':184 'unit':126 'usdc':78,128,137 'usdc-base' 'valid':108 'via':4,17,94 'wallet':180 'x':103 'x-payment':102 'x402':5,18,44,96,112 'x402 balance check' 'x402-payment'","prices":[{"id":"7abced05-c055-4890-b436-a9f95d59dcdb","listingId":"1733be60-8015-4bb5-b4ba-a15520547eb7","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/157/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":"2026-04-18T18:41:16.307Z"}],"sources":[{"listingId":"1733be60-8015-4bb5-b4ba-a15520547eb7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/157/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:16.307Z","lastSeenAt":"2026-04-30T13:33:50.424Z"}],"details":{"listingId":"1733be60-8015-4bb5-b4ba-a15520547eb7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/157/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/157/balance"},{"claim":"All endpoints 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 USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/157/balance"}],"useCases":["Querying account balance data for account 157 via a single micropayment","Integrating pay-per-call balance checks into agent workflows without API key management","Demonstrating x402 protocol micropayment flows on Base network"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents needing on-demand account balance lookups without subscription commitments","Projects requiring keyless, pay-per-use API access on Base"],"notFor":["Production use cases requiring documented response schemas and SLAs","Bulk or high-frequency balance queries where per-request pricing is inefficient","Users who need fiat payment options (only USDC on Base is accepted)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.693Z"},"updatedAt":"2026-04-30T13:33:50.424Z"}}