{"id":"8bf43592-a04a-4c75-a37c-9fad848d55b6","shortId":"Kak4xb","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/176/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 utility services — 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. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint name (\"Premium API Access\") and path (`/accounts/176/balance`) suggest it returns balance information for a specific account, but the exact request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","micropayment","pay-per-request","json-api"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","balance lookup","crypto payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet'","No OpenAPI or request/response schema provided; request body format and response structure are unknown","The endpoint path references a specific account ID (176); unclear if this is parameterizable or a fixed demo resource","The platform lists many endpoint categories (AI, analytics, finance, etc.) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/176/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/176/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 with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. The specific purpose of this particular endpoint (account 176 balance) is 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'/api/v1/accounts/176/balance':46 '0.02':10,24,122 '000':113 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':97 '20':112 '6':118 'Base network API' 'USDC pay-per-call' 'accept':85 'access':135,192 'account':4,18,35,204 'account balance API' 'account-balance' 'addit':166 'advertis':58,126 'ai':65 'amount':107 'analyt':64 'api':128,152,191 'attach':138 'avail':182 'balanc':5,19,36,199 'balance lookup' 'base':8,22,81,99,114 'behind':76 'bodi':209 'broad':60 'call':110 'catalog':61 'connect':161 'content':168 'contract':96 'crawl':185 'crypto payment API' 'data':63 'decim':119 'doc':151 'document':146,177 'endpoint':6,20,30,51,84,188 'equal':121 'exact':103,207 'exampl':181 'extrem':148 'financ':68 'format':210 'gate':3,17,75 'header':142 'inform':200 'infrastructur':71 'instant':134 'json':90 'json-api' 'key':129 'learn':67 'limit':132 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,55 'machin':66 'mani':50 'materi':186 'maximum':106 'micropay':78 'micropayment' 'name':189 'network':82 'offer':52 'one':48 'openapi':172 'page':156 'path':194 'pay':9,23 'pay-per-request' 'payment':41,91,141 'per':11,25,109 'platform':56,125 'post':86 'premium':190 'price':153 'prompt':163 'protocol':42 'provid':33 'rate':131 'readm':155 'render':158 'request':12,26,87,145,208 'request/response':175 'requir':108 'resourc':45 'respons':212 'return':89,198 'schema':176 'scheme':104 'servic':73 'settl':93 'simpli':137 'span':62 'spars':149 'spec':173 'specif':44,203 'structur':213 'suggest':196 'technic':167 'unit':115 'unknown':215 'usag':180 'usd':123 'usdc':14,28,95,117 'usdc-base' 'use':100 'util':72 'via':38 'wallet':162 'web3':69 'x402':2,16,40,77,102,140 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"60d3a92e-e5c8-42d3-9de0-4ea974afd432","listingId":"8bf43592-a04a-4c75-a37c-9fad848d55b6","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/176/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":"2026-04-18T18:41:31.325Z"}],"sources":[{"listingId":"8bf43592-a04a-4c75-a37c-9fad848d55b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/176/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:31.325Z","lastSeenAt":"2026-04-27T18:07:21.354Z"}],"details":{"listingId":"8bf43592-a04a-4c75-a37c-9fad848d55b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/176/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":"The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/accounts/176/balance"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/176/balance"}],"useCases":["Querying account balance information with per-request USDC micropayments","Integrating x402-gated balance checks into agent workflows","Demonstrating x402 protocol usage on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing pay-per-call balance lookups without API key management","Low-volume, on-demand account balance queries"],"notFor":["Production use cases requiring documented request/response schemas","High-throughput balance monitoring where per-request fees add up","Users without a Base network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.896Z"},"updatedAt":"2026-04-27T18:07:21.354Z"}}