{"id":"acb55c10-8c3f-4a5b-a82b-d8e57abc1ca6","shortId":"DDj3fP","kind":"x402","title":"x402-gated account balance endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/106/balance` is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the `exact` scheme, requiring up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. No API keys or rate limits are advertised; access is instant once payment is included in the `X-PAYMENT` header.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, 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 description of what the balance endpoint actually returns. The endpoint's purpose (account balance for account ID 106) is inferred solely from the URL path. Prospective callers should expect to experiment to discover the response format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","account-balance","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 USDC endpoint","Base network API","pay-per-call balance","lowpaymentfee API","crypto payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all show only a wallet connect prompt","No OpenAPI or request/response schema provided; response format is unknown","The specific purpose of /api/v1/accounts/106/balance is inferred solely from the URL; no description exists","The platform lists many endpoints but none have documented schemas or example payloads"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/106/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/106/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality is only guessable from the URL path. The docs pages are all empty wallet-connect 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'/api/v1/accounts/106/balance':46 '/docs':175 '/pricing':177 '/readme':179 '0.02':10,24,83,121 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':144 '106':219 '20':115 '6':126 'Base network API' 'accept':102 'access':153 'account':4,18,35,214,217 'account balance API' 'account-balance' 'actual':208 'address':135 'advertis':152 'ai/ml':71 'analyt':70 'api':67,146 'balanc':5,19,36,206,215 'base':8,22,91,117,138 'beyond':167 'broad':60 'call':66,129 'caller':228 'catalog':61 'challeng':95 'confirm':96 'connect':185 'content':191 'contract':142 'crypto payment API' 'data':69,74 'decim':127 'descript':202 'discov':234 'document':166 'endpoint':6,20,30,51,79,98,207,211 'exact':110 'exampl':199 'expect':230 'experi':232 'extrem':172 'finance/web3':73 'format':237 'gate':3,17 'header':165 'host':58 'id':218 'includ':159 'infer':72,221 'instant':155 'json-response' 'key':147 'land':169 'limit':150 'live':100 'lookup':37 'lowpaymentfee API' 'lowpaymentfee.com':32,55 'made':107 'mani':50 'network':92 'offer':52 'one':48 'openapi':195 'page':170,180 'path':226 'pay':9,23,64 'pay-per-cal':63 'pay-per-call balance' 'pay-per-request' 'payment':41,105,131,157,164 'per':11,25,65,84,128 'platform':56 'post':103 'price':81 'prompt':187 'prospect':227 'protocol':42 'provid':33 'purpos':213 'rate':149 'render':182 'request':12,26,85,104 'request/response':198 'requir':112 'resourc':45 'respons':236 'return':209 'schema':196 'scheme':111 'sent':133 'servic':77 'settl':86 'sinc':123 'sole':222 'span':68 'spars':173 'specif':44 'substant':190 'unit':118 'url':225 'usd':122 'usdc':14,28,88,120,124,141 'usdc-base' 'use':125,139 'util':76 'via':38,108 'wallet':186 'x':163 'x-payment':162 'x402':2,16,40,94 'x402 USDC endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"85e800a5-949f-484e-9aa1-6d1dc21950be","listingId":"acb55c10-8c3f-4a5b-a82b-d8e57abc1ca6","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/106/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":"2026-04-18T18:40:38.280Z"}],"sources":[{"listingId":"acb55c10-8c3f-4a5b-a82b-d8e57abc1ca6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/106/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:38.280Z","lastSeenAt":"2026-04-27T22:32:47.363Z"}],"details":{"listingId":"acb55c10-8c3f-4a5b-a82b-d8e57abc1ca6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/106/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 HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/accounts/106/balance"},{"claim":"Price is $0.02 per request (20000 base units USDC, 6 decimals)","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settles in USDC on Base network to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/accounts/106/balance"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data for account 106 via a single paid API call","Integrating x402-compatible agents with pay-per-request balance lookups","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need a cheap, keyless API call on Base","Quick account balance lookups without subscription overhead"],"notFor":["Production use cases requiring documented request/response schemas","Bulk or high-throughput balance queries where per-call pricing adds up","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.547Z"},"updatedAt":"2026-04-27T22:32:47.363Z"}}