{"id":"6ae4e169-1963-447c-8e86-0b384705e7aa","shortId":"Jgvfyv","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/122/balance` is described as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC on the Base network using the x402 \"exact\" scheme, with a maximum cost of $0.02 per request (20,000 base units of USDC at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access via x402 on Base.\n\nHowever, this specific endpoint (`/accounts/122/balance`) does not clearly map to any of the documented API categories on the landing page. There is no OpenAPI schema, no request/response documentation, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The actual behavior and response format of this endpoint remain unknown beyond what the x402 challenge reveals.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","account-balance","http-post"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","lowpaymentfee","pay-per-request API","Base network API","crypto payment API"],"warnings":["No OpenAPI or request/response schema available","Docs, pricing, and API pages render only 'Connect wallet' with no documentation content","The specific endpoint /api/v1/accounts/122/balance is not listed among the platform's documented APIs","Actual response format and required request body are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/122/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/122/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, and the docs pages are empty. The specific endpoint path (/accounts/122/balance) is not documented on the landing page, making its purpose and output format 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'/api/v1/accounts/122/balance':46 '0.02':76,126 '000':80 '20':79 '6':86 'Base network API' 'USDC micropayment API' 'accept':54 'access':52,140 'account':4,18,35 'account balance API' 'account-balance' 'actual':192 'advertis':92 'ai/ml':104 'analysi':107 'analyt':103 'api':51,100,133,159,178 'balanc':5,19,36 'base':8,22,64,81,144 'base-network' 'behavior':193 'beyond':202 'broader':89 'call':12,26,99 'categori':160 'challeng':206 'classif':109 'clear':152 'connect':184 'content':190 'convers':121 'cost':74 'crypto':113 'crypto payment API' 'data':102,115 'decim':87 'describ':48 'doc':175 'document':158,172 'embed':110 'emphas':131 'endpoint':6,20,30,148,199 'exact':69 'financ':111 'format':196 'gate':3,17 'generat':122 'geocod':119 'howev':145 'http-post' 'infer':105 'infrastructur':117 'instant':139 'key':134 'land':163 'limit':137 'lookup':37 'lowpaymentfee' 'lowpaymentfee.com':32,90 'map':153 'market':114 'maximum':73 'network':65 'openapi':168 'page':164,179 'pay':10,24,97 'pay-per-cal':9,23,96 'pay-per-call' 'pay-per-request API' 'payment':41,57 'per':11,25,77,98,127 'platform':91,130 'post':55 'premium':50 'price':124,176 'prompt':186 'protocol':42 'provid':33 'rate':136 'remain':200 'render':181 'request':56,78,128 'request/response':171 'resourc':45 'respons':195 'reveal':207 'schema':169 'scheme':70 'sentiment':106 'settl':59 'span':101 'specif':44,147 'suit':94 'summar':108 'unit':82 'unknown':201 'usdc':14,28,61,84 'usdc-settlement' 'use':66 'util':118 'valid':120 'via':38,141 'wallet':185 'x402':2,16,40,68,142,205 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"e9cfa011-291f-446f-84eb-14f7314ca79e","listingId":"6ae4e169-1963-447c-8e86-0b384705e7aa","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/122/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":"2026-04-18T18:40:52.810Z"}],"sources":[{"listingId":"6ae4e169-1963-447c-8e86-0b384705e7aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/122/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:52.810Z","lastSeenAt":"2026-04-27T22:03:22.906Z"}],"details":{"listingId":"6ae4e169-1963-447c-8e86-0b384705e7aa","quickStartSnippet":"# The endpoint returns 402 until a valid X-PAYMENT header is provided.\n# Use an x402-compatible client to handle payment automatically.\n\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/122/balance \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/122/balance"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying account balance data via a pay-per-call model without API keys","Integrating x402-compatible agents that settle payments in USDC on Base","Accessing premium data endpoints with per-request micropayments"],"bestFor":["Agents or applications that support x402 payment protocol","Users who want keyless, pay-as-you-go API access","Developers building on Base network with USDC settlement"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume use cases where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.96Z"},"updatedAt":"2026-04-27T22:03:22.906Z"}}