{"id":"e6b78c5f-7fda-438d-a7cf-433b33ec3892","shortId":"HTRCKB","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 exposes an account balance resource at `/api/v1/accounts/79/balance` behind the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider, lowpaymentfee.com, hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services (geocoding, validation, conversion, generation), all priced at $0.02 per request. However, this specific listing covers only the `/api/v1/accounts/79/balance` endpoint. The exact semantics of \"account 79 balance\" are not documented — it may return a financial account balance, a wallet balance, or similar structured data. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl.\n\nThe endpoint is live and returned a proper 402 challenge when probed. The x402 challenge specifies version 1, the \"exact\" payment scheme, and a 300-second payment timeout. The output schema indicates it is discoverable and accepts HTTP POST.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","account-balance","pay-per-call","json-response"],"categories":["finance","infrastructure"],"synonyms":["account balance API","x402 API","USDC micropayment API","pay-per-request API","Base network API","lowpaymentfee","balance check endpoint"],"warnings":["No documentation found — /docs, /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no content.","The exact meaning of 'accounts/79/balance' is undocumented; the resource semantics are unknown.","No request body schema or response schema available; callers must discover behavior empirically.","No OpenAPI or ai-plugin manifest detected."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/79/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/79/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 and returns a valid x402 402 challenge, confirming it works. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the purpose of 'accounts/79/balance' is unclear. This is effectively a stub 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'0.02':68,136 '000':72 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':62 '1':202 '20':71 '300':209 '402':193 '6':76 '79':153 'Base network API' 'USDC micropayment API' 'accept':46,221 'account':4,18,35,152,163 'account balance API' 'account-balance' 'ai/ml':116 'analysi':119 'analyt':115 'api':79,112 'attach':88 'balanc':5,19,36,154,164,167 'balance check endpoint' 'base':8,22,57,73 'base-network' 'behind':40 'broader':105 'call':12,26,111 'caller':86 'catalog':106 'challeng':194,199 'classif':121 'contract':61 'convers':131 'cost':66 'cover':143 'crawl':184 'data':114,125,171 'decim':77 'detail':178 'discover':219 'document':157,179 'embed':122 'endpoint':6,20,30,147,186 'exact':149,204 'exampl':176 'expos':33 'finance/crypto':123 'financi':162 'found':181 'gate':3,17 'generat':132 'geocod':129 'header':93 'host':103 'howev':139 'http':222 'indic':216 'infer':117 'json':51 'json-response' 'key':80 'limit':83 'list':142 'live':188 'lowpaymentfee' 'lowpaymentfee.com':32,102 'market':124 'maximum':65 'may':159 'network':58 'openapi':173 'output':214 'pay':10,24,109 'pay-per-cal':9,23,108 'pay-per-call' 'pay-per-request API' 'payment':43,52,92,98,205,211 'per':11,25,69,110,137 'post':47,223 'price':134 'probe':196 'proof':99 'proper':192 'protocol':44 'provid':101 'rate':82 'request':48,70,138 'request/response':175 'requir':85 'resourc':37 'return':50,160,190 'schema':174,215 'scheme':206 'second':210 'semant':150 'sentiment':118 'servic':128 'settl':54 'similar':169 'simpli':87 'span':113 'specif':141 'specifi':200 'structur':170 'summar':120 'timeout':212 'unit':74 'usdc':14,28,60 'usdc-settlement' 'use':59 'util':127 'valid':96,130 'version':201 'wallet':166 'x':91 'x-payment':90 'x402':2,16,42,97,198 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"a11a3fcb-bfc7-439e-85e0-6c037d08d9b6","listingId":"e6b78c5f-7fda-438d-a7cf-433b33ec3892","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/79/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":"2026-04-18T18:40:09.144Z"}],"sources":[{"listingId":"e6b78c5f-7fda-438d-a7cf-433b33ec3892","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/79/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:09.144Z","lastSeenAt":"2026-04-28T04:04:34.522Z"}],"details":{"listingId":"e6b78c5f-7fda-438d-a7cf-433b33ec3892","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/79/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 a 402 challenge with x402 version 1, exact scheme, on Base network using USDC at max 20000 base units.","source_url":"https://lowpaymentfee.com/api/v1/accounts/79/balance"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, making 20000 base units equal to $0.02.","source_url":"https://lowpaymentfee.com/api/v1/accounts/79/balance"},{"claim":"The provider lists all APIs at $0.02/request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers additional endpoints for analytics, AI/ML, finance, and utility services.","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying an account balance via a single paid API call","Integrating pay-per-call balance lookups into agent workflows","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Agents or services that need on-demand account balance data without API key management","Developers experimenting with x402 micropayment-gated APIs","Automated workflows requiring low-friction, per-call payment"],"notFor":["High-volume balance polling where $0.02/request adds up quickly","Use cases requiring detailed documentation or guaranteed SLAs","Users who need free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.953Z"},"updatedAt":"2026-04-28T04:04:34.522Z"}}