{"id":"200dbb9b-11e9-4623-a7a3-cc09154ade59","shortId":"mmEmyd","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 specified account (account ID 42 in the probed URL). It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs — all gated behind x402 micropayments on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. The platform advertises a flat $0.02/request price across all endpoints, with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format after successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","account-balance","micropayment","json-api","no-api-key"],"categories":["finance","data"],"synonyms":["account balance API","x402 balance check","USDC micropayment API","Base network API","pay-per-call balance","lowpaymentfee API","crypto payment API"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose and data returned by the /accounts/42/balance endpoint cannot be verified from available materials","No request body schema documented; unclear what parameters (if any) the POST body accepts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/42/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/42/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no example payloads. The actual functionality behind 'account balance' is 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'/docs':151 '/pricing':152 '/readme':155 '/request':127 '0.02':11,24,120,126 '000':111 '20':110 '402':191 '42':41 '6':116 'Base network API' 'USDC micropayment API' 'accept':76 'account':2,15,32,38,39 'account balance API' 'account-balance' 'across':129 'actual':195 'addit':166 'advertis':123 'ai/ml':56 'amount':105 'analyt':55 'api':62,134 'avail':182 'balanc':3,16,33 'base':8,21,70,102,112 'behind':65 'beyond':144 'broader':51 'call':108 'caller':89 'challeng':192 'check':1,14 'commit':142 'confirm':186 'connect':161 'crypto payment API' 'data':54 'decim':117 'detail':168 'document':143,177 'endpoint':28,75,131,184 'equal':119 'exampl':180 'finance/web3':58 'flat':125 'format':197 'gate':64 'handl':84 'header':95 'id':40 'includ':90 'infer':57 'inform':34 'infrastructur':60 'json':81 'json-api' 'key':135 'land':146 'limit':138 'live':187 'lowpaymentfee API' 'lowpaymentfee.com':30 'maximum':104 'micropay':6,19,67 'micropayment' 'minimum':141 'network':9,22,71 'no-api-key' 'offer':53 'openapi':172 'page':147,156 'part':48 'pay-per-call balance' 'payload':181 'payment':82,94,100,200 'per':12,25,107 'platform':52,122 'post':77 'price':128 'probe':44 'prompt':163 'proper':190 'protocol':88 'rate':137 'render':158 'request':13,26,78 'request/response':175 'requir':106 'respons':196 'return':31,80,188 'schema':176 'sign':98 'spars':149 'spec':173 'specifi':37 'success':199 'technic':167 'unit':113 'unknown':202 'url':45 'usdc':73,99,115 'usdc-base' 'use':72 'util':61 'via':4,17,85 'wallet':162 'x':93 'x-payment':92 'x402':5,18,66,87 'x402 balance check' 'x402-payment'","prices":[{"id":"9593bc34-acd9-447d-85c8-1003cf4a5327","listingId":"200dbb9b-11e9-4623-a7a3-cc09154ade59","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/42/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":"2026-04-18T18:39:39.607Z"}],"sources":[{"listingId":"200dbb9b-11e9-4623-a7a3-cc09154ade59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/42/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:39.607Z","lastSeenAt":"2026-04-29T05:33:53.156Z"}],"details":{"listingId":"200dbb9b-11e9-4623-a7a3-cc09154ade59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/42/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/42/balance"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/42/balance"}],"useCases":["Querying account balance data with per-request USDC micropayments","Integrating pay-per-call balance lookups into agent workflows without API key management","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents needing on-demand account balance data without subscription commitments","Projects requiring keyless, pay-per-use API access on Base"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-volume balance queries where per-request pricing may add up compared to subscription models","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.298Z"},"updatedAt":"2026-04-29T05:33:53.156Z"}}