{"id":"e3721bd0-3933-48a1-b1cb-ebf8d276780a","shortId":"tb3gFw","kind":"x402","title":"x402-gated account balance endpoint on Base, paid per-call in USDC.","tagline":"x402-gated account balance endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/accounts/49/balance`. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint probed returns an account balance (for account ID 49) and accepts POST requests. Payment is settled in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) using the x402 \"exact\" scheme. The maximum amount required per call is 20,000 base units of USDC, which with 6 decimals equals $0.02 USD — consistent with the platform's advertised flat $0.02/request pricing across all endpoints. No API keys are required; access is granted purely through the x402 payment header. The platform advertises no rate limits and instant access.\n\nDocumentation on the site is extremely thin — the /docs, /pricing, /api, 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. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format after payment is unknown. The platform lists many other endpoints (sentiment analysis, text summarization, geocoding, gas estimates, etc.) at the same $0.02 price point, but none have documented schemas.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No request or response schema documented; actual output format after payment is unknown","The specific endpoint path (/api/v1/accounts/49/balance) suggests a hardcoded account ID with unclear utility for general consumers","Platform lists many endpoints across diverse domains (AI, finance, geocoding) all at $0.02 — unclear if these are functional or placeholder"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/49/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/49/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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and all documentation pages are empty beyond a wallet connect prompt. The actual purpose and output of this specific endpoint (account 49 balance) is 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'/api/v1/accounts/49/balance':42 '/docs':175 '/pricing':176 '/readme':179 '/request':139 '0.02':129,138,241 '000':119 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':103 '20':118 '402':213 '49':92 '6':126 'Base network API' 'USDC micropayment API' 'accept':94 'access':37,149,166 'account':4,18,87,90 'account balance API' 'account-balance' 'across':141 'actual':217 'advertis':136,160 'ai/ml':63 'amount':113 'analysi':231 'analyt':62 'api':36,58,145 'balanc':5,19,88 'base':8,22,79,105,120 'base-network' 'broader':48 'call':12,26,57,116 'challeng':214 'confirm':208 'connect':185 'consist':131 'content':191 'contract':102 'crypto payment API' 'data':61,66 'decim':127 'document':167,200,247 'dozen':52 'endpoint':6,20,30,59,83,143,206,229 'equal':128 'estim':236 'etc':237 'exact':109 'exampl':204 'extrem':172 'finance/web3':65 'flat':137 'format':219 'gas':235 'gate':3,17,71 'geocod':234 'grant':151 'header':157 'id':91 'infer':64 'instant':165 'key':146 'limit':163 'list':226 'live':209 'lowpaymentfee' 'lowpaymentfee.com':32 'mani':227 'maximum':112 'network':80 'no-api-key' 'none':245 'offer':51 'openapi':195 'page':180 'paid':9,23 'part':45 'path':41 'pay':55 'pay-per-cal':54 'pay-per-call' 'pay-per-request API' 'payment':75,97,156,221 'per':11,25,56,115 'per-cal':10,24 'platform':49,134,159,225 'point':243 'post':95 'premium':35 'price':140,242 'probe':84 'prompt':187 'proper':212 'protocol':76 'provid':33 'pure':152 'rate':162 'render':182 'request':96 'request/response':198 'requir':114,148 'resourc':38 'respons':218 'return':85,210 'schema':199,248 'scheme':110 'sentiment':230 'servic':69 'settl':99 'site':170 'span':60 'spec':196 'specif':82 'summar':233 'text':232 'thin':173 'unit':121 'unknown':223 'usag':203 'usd':130 'usdc':14,28,101,123 'usdc-settlement' 'use':106 'util':68 'via':72 'wallet':186 'x402':2,16,74,108,155 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a30e4ef6-a25b-4b51-a0e2-8f61dd9e3c31","listingId":"e3721bd0-3933-48a1-b1cb-ebf8d276780a","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/49/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":"2026-04-18T18:39:44.385Z"}],"sources":[{"listingId":"e3721bd0-3933-48a1-b1cb-ebf8d276780a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/49/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:44.385Z","lastSeenAt":"2026-04-28T07:04:58.093Z"}],"details":{"listingId":"e3721bd0-3933-48a1-b1cb-ebf8d276780a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/49/balance \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/49/balance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/49/balance"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data via a single paid API call","Integrating x402-compatible payment flows into agent workflows","Accessing pay-per-call services without API key management"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need simple pay-per-call access without subscription overhead","Low-volume, on-demand account balance lookups"],"notFor":["Production use requiring documented request/response schemas","High-volume balance queries where $0.02/call adds up quickly","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.073Z"},"updatedAt":"2026-04-28T07:04:58.093Z"}}