{"id":"ac3d0aee-1bf8-4acc-ba3b-795fd3fada8f","shortId":"eH37Gv","kind":"x402","title":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated account balance endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/150/balance` is described as \"Premium API Access\" and returns JSON. It accepts POST requests and is gated behind an x402 payment challenge requiring USDC on the Base network.\n\nThe x402 challenge specifies a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the provider's site-wide pricing of $0.02/request across all their APIs. The provider advertises no API keys, no rate limits, and instant access. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader lowpaymentfee.com platform offers multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities — all at the same $0.02/request price point. However, this specific listing covers only the `/api/v1/accounts/150/balance` endpoint. Documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the exact request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-request API","Base network API","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","The request body schema and response schema for this endpoint are completely unknown.","The endpoint path includes a hardcoded account ID (150); it is unclear whether this is parameterizable or fixed.","The broader platform lists many API categories but none of the other endpoints were probed for liveness."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/150/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/150/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, no request/response schema, and no explanation of what 'accounts/150/balance' actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/request':114,169 '0.02':100,113,168 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x8335':88 '20':82 '2913':89 '300':142 '6':95 'Base network API' 'USDC micropayment API' 'accept':57 'access':52,130 'account':4,18,35 'account balance API' 'account-balance' 'across':115 'address':138 'advertis':121 'ai':156 'amount':80 'analyt':155 'api':51,118,123,151 'balanc':5,19,36 'base':8,22,72,84,91 'base-network' 'behind':63 'broader':146 'call':12,26 'categori':152 'chain':136 'challeng':67,76 'connect':189 'consist':103 'content':195 'cover':176 'data':154 'decim':96 'describ':48 'doc':183 'document':181 'endpoint':6,20,30,180,203 'exact':198 'financ':159 'gate':3,17,62 'howev':172 'includ':153 'infrastructur':162 'instant':129 'json':55 'key':124 'learn':158 'limit':127 'list':175 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,147 'machin':157 'maximum':79 'multipl':150 'network':73 'no-api-key' 'offer':149 'on-chain':134 'page':182 'pay':10,24 'pay-per-cal':9,23 'pay-per-call' 'pay-per-request API' 'payment':41,66,131 'per':11,25,101 'platform':148 'point':171 'post':58 'premium':50 'price':111,170,184 'prompt':191 'protocol':42 'provid':33,106,120 'rate':126 'readm':185 'request':59,102 'request/response':199 'requir':68 'resourc':45 'return':54,186 'schema':200 'second':143 'settl':133 'sinc':92 'site':109 'site-wid':108 'specif':44,174 'specifi':77 'substant':194 'timeout':144 'translat':98 'unit':85 'unknown':205 'usdc':14,28,69,87,93 'usdc-settlement' 'use':94 'util':163 'via':38 'wallet':190 'web3':160 'wide':110 'x402':2,16,40,65,75 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"bf44197e-7702-4f06-b382-36b27db0e589","listingId":"ac3d0aee-1bf8-4acc-ba3b-795fd3fada8f","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/150/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":"2026-04-18T18:41:12.084Z"}],"sources":[{"listingId":"ac3d0aee-1bf8-4acc-ba3b-795fd3fada8f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/150/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:12.084Z","lastSeenAt":"2026-04-29T03:04:51.036Z"}],"details":{"listingId":"ac3d0aee-1bf8-4acc-ba3b-795fd3fada8f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/150/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 x402 challenge requires 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equating to $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/accounts/150/balance"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/accounts/150/balance"}],"useCases":["Querying account balance information via a single paid API call","Integrating pay-per-call balance lookups into agent workflows","Accessing premium account data without API key registration"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Low-volume or sporadic balance lookups where per-call pricing is preferred","Developers wanting keyless API access with on-chain payment"],"notFor":["High-volume balance queries where per-call costs would accumulate significantly","Users who need detailed API documentation or response schema guarantees before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.958Z"},"updatedAt":"2026-04-29T03:04:51.036Z"}}