{"id":"725aa509-4d0b-48b0-8ec7-cb6e2601bb97","shortId":"MLSYcP","kind":"x402","title":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated account balance endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides a premium account balance API accessible via the x402 payment protocol. The specific route `/api/v1/accounts/92/balance` returns account balance data in JSON format upon receipt of a valid x402 payment header. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required; access is gated purely by micropayment.\n\nThe provider, lowpaymentfee.com, hosts a broader suite of x402-gated APIs spanning data & analytics (metrics, reports, data export, insights), AI & ML (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with the same pay-per-use model.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the balance response payload actually contains. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data to send or expect back.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["account balance API","x402 balance endpoint","micropayment API","USDC pay-per-call","lowpaymentfee API","Base network API","crypto-gated API"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific endpoint path includes a hardcoded account ID (92), purpose unclear","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/92/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/92/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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no technical content. The purpose of the specific /accounts/92/balance route is not explained beyond the generic 'Premium API Access' 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'0.02':10,24,87,158 '000':82 '0x8335':74 '20':81 '2913':75 '402':218 '6':92 'Base network API' 'USDC pay-per-call' 'access':39,102 'account':4,18,36,50 'account balance API' 'account-balance' 'actual':208 'ai':128 'amount':79 'analysi':131 'analyt':122 'api':38,95,119,177 'back':236 'balanc':5,19,37,51,205 'base':8,22,69,83 'base-network' 'broader':113 'challeng':219 'classif':134 'confirm':213 'connect':183 'contain':209 'contract':73 'convers':151 'crypto-gated API' 'data':52,121,125,231 'decim':93 'descript':201 'detail':190 'difficult':227 'doc':174 'document':169,224 'embed':135 'endpoint':6,20,30,154,211 'equal':86 'estim':145 'exampl':198 'exchang':140 'expect':235 'export':126 'extrem':171 'feed':139 'financ':136 'format':55 'gas':144 'gate':3,17,104,118 'generat':152 'geocod':149 'header':63 'host':111 'infrastructur':147 'insight':127 'json':54 'json-response' 'key':96 'know':229 'lack':222 'limit':99 'list':156 'live':214 'lowpaymentfee API' 'lowpaymentfee.com':32,110 'make':225 'maximum':78 'metric':123 'micropay':107 'micropayment API' 'ml':129 'model':168 'network':70 'no-api-key' 'openapi':194 'page':178 'pay':9,23,165 'pay-per-request' 'pay-per-us':164 'payload':207 'payment':43,62,64 'per':11,25,88,159,166 'premium':35 'price':138,175 'prompt':185 'proper':217 'protocol':44 'provid':33,109 'pure':105 'quot':143 'rate':98,141 'receipt':57 'render':180 'report':124 'request':12,26,89,160 'request/response':197 'requir':101 'respons':206 'return':49,215 'rout':47 'schema':195 'send':233 'sentiment':130 'settl':66 'span':120 'spars':172 'specif':46 'suit':114 'summar':133 'technic':189 'text':132 'token':142 'unit':84 'upon':56 'usdc':14,28,72,90 'usdc-micropayment' 'use':71,91,167 'util':148 'valid':60,150 'via':40 'wallet':184 'web3':137 'x402':2,16,42,61,117 'x402 balance endpoint' 'x402-gated':1,15,116 'x402-payment'","prices":[{"id":"40422855-9d47-4f0a-9324-0205405e7d81","listingId":"725aa509-4d0b-48b0-8ec7-cb6e2601bb97","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/92/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":"2026-04-18T18:40:20.086Z"}],"sources":[{"listingId":"725aa509-4d0b-48b0-8ec7-cb6e2601bb97","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/92/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:20.086Z","lastSeenAt":"2026-04-29T04:33:21.560Z"}],"details":{"listingId":"725aa509-4d0b-48b0-8ec7-cb6e2601bb97","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/92/balance\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 v1 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/92/balance"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/92/balance"},{"claim":"Provider offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance data without managing API keys","Agent-driven balance lookups settled via on-chain USDC micropayments","Integrating pay-per-call financial data into automated workflows"],"bestFor":["Developers wanting key-free, pay-per-use API access","AI agents that can settle x402 payments on Base","Prototyping micropayment-gated data services"],"notFor":["Users needing detailed API documentation or SDKs before integrating","High-volume batch queries where per-request pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.42Z"},"updatedAt":"2026-04-29T04:33:21.560Z"}}