{"id":"9d4363fa-9aea-438f-807b-33dd653b4436","shortId":"F3TTWF","kind":"x402","title":"Check account balance via x402 micropayment on Base network for $0.02 per request.","tagline":"Check account balance via x402 micropayment on Base network for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns account balance information for a specific account (ID 186) behind an x402 paywall. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The max amount required is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.\n\nDocumentation on the site is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. The specific input schema and response format for this balance endpoint are not documented, so the exact fields returned are unknown. The platform advertises itself as a low-fee, pay-per-use API marketplace, but the actual functionality behind each endpoint cannot be verified from the crawl alone.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","Request body schema and response format are completely undocumented","The specific account ID (186) is hardcoded in the endpoint path; unclear if this is a demo or production resource","Cannot verify what data this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/186/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/186/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation for request/response schemas, no examples, and the docs/pricing/API pages are empty beyond a wallet connect prompt. The actual functionality behind this specific balance endpoint is 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'000':110 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '186':40 '20':109 '6':124 'Base network API' 'USDC pay-per-call' 'accept':78 'account':2,15,32,38 'account balance API' 'account-balance' 'actual':206 'addit':166 'advertis':191 'ai/ml':55 'alon':217 'amount':106 'analyt':54 'api':61,129,152,202 'balanc':3,16,33,177 'base':8,21,74,111,117 'behind':41,208 'broader':50 'call':139 'caller':91 'cannot':211 'check':1,14 'commit':137 'connect':161 'content':167 'crawl':216 'crypto payment API' 'data':53 'decim':125 'doc':151 'document':143,181 'endpoint':28,77,178,210 'equal':119 'exact':184 'extrem':148 'fee':197 'field':185 'finance/web3':57 'format':174 'function':207 'given':121 'handl':86 'header':98 'id':39 'includ':93 'independ':141 'infer':56 'inform':34 'infrastructur':59 'input':170 'json':83 'json-response' 'key':130 'limit':133 'low':196 'low-fe':195 'lowpaymentfee' 'lowpaymentfee.com':30 'marketplac':203 'max':105 'micropay':6,19 'micropayment API' 'must':92 'network':9,22,75 'no-api-key' 'offer':52 'page':156 'paid':142 'part':47 'pay':199 'pay-per-request' 'pay-per-us':198 'payment':84,97,102 'paywal':44 'per':12,25,66,200 'platform':51,190 'post':79 'price':63,153 'prompt':163 'proof':103 'protocol':90 'rate':132 'readm':155 'render':158 'request':13,26,67,80 'requir':107 'respons':173 'return':31,82,186 'schema':171 'settl':69 'site':146 'spars':149 'specif':37,169 'subscript':136 'unit':112 'unknown':188 'usdc':71,114,122 'usdc-base' 'use':201 'util':60 'valid':101 'verifi':213 'via':4,17,87 'wallet':162 'x':96 'x-payment':95 'x402':5,18,43,89 'x402 balance check' 'x402-payment'","prices":[{"id":"011e4d88-b924-45a6-b868-efee3d9d6633","listingId":"9d4363fa-9aea-438f-807b-33dd653b4436","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/186/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":"2026-04-18T18:41:34.366Z"}],"sources":[{"listingId":"9d4363fa-9aea-438f-807b-33dd653b4436","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/186/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:34.366Z","lastSeenAt":"2026-04-27T18:07:21.456Z"}],"details":{"listingId":"9d4363fa-9aea-438f-807b-33dd653b4436","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/186/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/186/balance"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/186/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating pay-per-use balance lookups into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents needing on-demand account balance data without API key management","Low-volume, pay-as-you-go API consumers on Base network"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume balance queries where per-request fees add up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.751Z"},"updatedAt":"2026-04-27T18:07:21.456Z"}}