{"id":"34588b08-a863-42d0-93a1-b00198733a62","shortId":"ZTj79b","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 (account ID 23 in the probed URL). It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint is live and responds with a standard x402 payment challenge. Each request costs $0.02 (20,000 base units of USDC, which has 6 decimals). Payment is made via the x402 \"exact\" scheme to a specified wallet address. The platform advertises no API keys, no rate limits, and instant access — you simply attach an X-PAYMENT header with a valid payment proof to get a response.\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 beyond the x402 challenge's outputSchema indicating it accepts HTTP POST, and no example payloads. The specific data returned by the balance endpoint is not documented anywhere in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-request","no-api-key","http-post"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 balance check","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto balance endpoint"],"warnings":["No documentation available — all doc/pricing/API pages render only 'Connect wallet'","No OpenAPI or response schema provided; actual response format is unknown","The specific endpoint path (/accounts/23/balance) suggests a hardcoded account ID; unclear if other account IDs are supported","Platform appears to be a demo or early-stage project with many advertised endpoints but no substantive docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/23/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/23/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 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and no description of what the balance endpoint actually returns. The listing is largely inferred from the x402 challenge and the homepage's generic API 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'000':96 '20':95 '23':41 '6':103 'Base network API' 'USDC pay-per-call' 'accept':186 'access':129 'account':2,15,32,38,39 'account balance API' 'account-balance' 'across':59 'addit':167 'address':117 'advertis':120 'ai/ml':62 'analyt':61 'anywher':204 'api':58,122,153 'attach':132 'balanc':3,16,33,199 'base':8,21,75,97 'base-network' 'beyond':178 'broader':51 'categori':66 'challeng':90,181 'check':1,14 'connect':162 'content':169 'cost':93 'crawl':207 'crypto balance endpoint' 'data':60,195 'decim':104 'doc':152 'document':147,203 'endpoint':28,80,200 'exact':111 'exampl':191 'extrem':149 'finance/web3':63 'get':144 'header':137 'http':187 'http-post' 'id':40 'indic':184 'inform':34 'infrastructur':65 'instant':128 'key':123 'limit':126 'live':82 'lowpaymentfee' 'lowpaymentfee.com':30 'made':107 'materi':208 'micropay':6,19 'micropayment API' 'network':9,22,76 'no-api-key' 'offer':53 'openapi':173 'outputschema':183 'page':157 'part':48 'pay':55 'pay-per-request':54 'payload':192 'payment':89,105,136,141 'per':12,25,56 'platform':52,119 'post':188 'price':154 'probe':44 'prompt':164 'proof':142 'protocol':72 'rate':125 'readm':156 'render':159 'request':13,26,57,92 'request/response':176 'respond':84 'respons':146 'return':31,196 'schema':177 'scheme':112 'settl':68 'simpli':131 'spars':150 'spec':174 'specif':37,194 'specifi':115 'standard':87 'technic':168 'unit':98 'url':45 'usdc':78,100 'usdc-settlement' 'use':77 'valid':140 'via':4,17,69,108 'wallet':116,163 'x':135 'x-payment':134 'x402':5,18,71,88,110,180 'x402 balance check' 'x402-payment'","prices":[{"id":"7a9dc46b-69c5-4ca6-98cd-b2ae369eeb33","listingId":"34588b08-a863-42d0-93a1-b00198733a62","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/23/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":"2026-04-18T18:39:23.345Z"}],"sources":[{"listingId":"34588b08-a863-42d0-93a1-b00198733a62","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/23/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:23.345Z","lastSeenAt":"2026-04-28T10:05:13.288Z"}],"details":{"listingId":"34588b08-a863-42d0-93a1-b00198733a62","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/23/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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/accounts/23/balance"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC on Base)","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/23/balance"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data programmatically with per-request micropayments","Integrating balance checks 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","Low-volume, pay-as-you-go API consumers"],"notFor":["Users needing detailed API documentation or response schema guarantees","High-volume balance polling where per-request fees add up quickly","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.024Z"},"updatedAt":"2026-04-28T10:05:13.288Z"}}