{"id":"390ba9ad-0cc1-4b24-86b6-d3d67c84b6d2","shortId":"SXFyGJ","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 an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/97/balance` is one of many endpoints offered by the lowpaymentfee.com platform, which advertises a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. 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 (6 decimals), which equals $0.02 USD. No API keys are needed; access is granted per-request upon valid x402 payment. The platform advertises no rate limits and instant access.\n\nDocumentation is extremely sparse — 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, and no usage examples available from the crawl. The exact semantics of \"account 97 balance\" (whether it refers to a crypto wallet balance, a platform account, or something else) are not documented. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","json-api","per-request-micropayment"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee"],"warnings":["No API documentation available; all doc pages show only 'Connect wallet'","No request or response schema provided — input/output format is unknown","The meaning of 'accounts/97/balance' is undocumented; unclear what data is returned","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/97/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/97/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 render only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific endpoint (account 97 balance) is unclear. The listing is effectively a 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'/api/v1/accounts/97/balance':46 '/docs':152 '/pricing':153 '/readme':156 '0.02':10,24,121 '000':112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':96 '20':111 '402':217 '6':117 '97':190 'Base network API' 'USDC micropayment API' 'accept':84 'access':128,146 'account':4,18,35,189,202 'account balance API' 'account-balance' 'advertis':58,140 'ai':65 'amount':106 'analyt':64 'api':124 'avail':181 'balanc':5,19,36,191,199 'base':8,22,80,98,113 'base-network' 'behind':75 'broad':60 'call':109 'catalog':61 'challeng':218 'confirm':212 'connect':162 'content':168 'contract':95 'crawl':184 'crypto':197 'data':63 'decim':118 'document':147,208 'els':205 'endpoint':6,20,30,51,83,210 'equal':120 'exact':102,186 'exampl':180 'extrem':149 'financ':68 'gate':3,17,74 'grant':130 'infrastructur':71 'instant':145 'json':89 'json-api' 'key':125 'learn':67 'limit':143 'live':213 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,55 'machin':66 'mani':50 'maximum':105 'micropay':77 'need':127 'network':81 'offer':52 'one':48 'openapi':172 'page':157 'pay':9,23 'pay-per-call balance' 'payment':41,90,137 'per':11,25,108,132 'per-request':131 'per-request-micropayment' 'platform':56,139,201 'post':85 'prompt':164 'protocol':42 'provid':33 'rate':142 'refer':194 'render':159 'request':12,26,86,133 'request/response':175 'requir':107 'resourc':45 'respons':219 'return':88 'schema':176 'scheme':103 'semant':187 'settl':92 'someth':204 'span':62 'spars':150 'spec':173 'specif':44 'unit':114 'upon':134 'usag':179 'usd':122 'usdc':14,28,94,116 'usdc-settlement' 'use':99 'util':72 'valid':135,216 'via':38,214 'wallet':163,198 'web3':69 'whether':192 'x402':2,16,40,76,101,136 'x402 balance check' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"831ed6ba-189f-47ee-9fab-974b354db426","listingId":"390ba9ad-0cc1-4b24-86b6-d3d67c84b6d2","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/97/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":"2026-04-18T18:40:24.363Z"}],"sources":[{"listingId":"390ba9ad-0cc1-4b24-86b6-d3d67c84b6d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/97/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:24.363Z","lastSeenAt":"2026-04-28T02:33:33.937Z"}],"details":{"listingId":"390ba9ad-0cc1-4b24-86b6-d3d67c84b6d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/97/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 x402Version 1, exact scheme, on Base network, requiring 20000 base units of USDC","source_url":"https://lowpaymentfee.com/api/v1/accounts/97/balance"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/97/balance"},{"claim":"Platform advertises $0.02/request pricing, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying account balance information via a single paid API call","Integrating x402 micropayment-gated balance lookups into agent workflows","Programmatic balance checks without API key registration"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents needing on-demand balance data without subscription commitments","Low-volume, pay-per-use balance queries on Base"],"notFor":["High-volume balance monitoring requiring bulk or streaming access","Users who need detailed API documentation or guaranteed SLAs","Use cases requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.271Z"},"updatedAt":"2026-04-28T02:33:33.937Z"}}