{"id":"03441a62-d2a5-4a95-9bee-89777c191a86","shortId":"YwCutk","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform uses the x402 payment protocol, meaning callers attach a payment header to each request rather than managing API keys, subscriptions, or rate limits.\n\nThe specific endpoint at `/api/v1/accounts/172` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per-call price point. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no further technical detail, so the exact request/response schemas for this endpoint and others are unknown.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base-network","no-api-key","post-endpoint","pay-per-use"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/accounts/172 is unknown — 'Premium API Access' is the only description","All documentation pages beyond the landing page returned only 'Connect wallet' with no technical content","The platform lists many endpoint categories (AI, finance, utils) but none could be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/172","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/172","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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond the landing page, no request/response examples, and the purpose of the /api/v1/accounts/172 endpoint specifically is entirely opaque. The docs, pricing, API, and README pages all returned only 'Connect wallet' with no useful 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'/request':13,32 '0.02':12,31,67,136,184 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':131 '20':125 '300':151 '6':140 'accept':114 'access':112 'across':53 'addit':158 'address':147 'advertis':120,157 'ai/ml':56 'amount':123 'analysi':162 'analyt':55 'api':5,17,24,36,45,96,111 'attach':86 'base':8,27,75,127,133 'base network api' 'beyond':192 'broader':155 'call':4,23,187 'caller':85 'challeng':119 'classif':165 'connect':199 'convers':177 'data':54 'decim':141 'detail':206 'document':190 'embed':166 'enabl':44 'endpoint':52,63,104,159,214 'equal':135 'estim':174 'exact':209 'exchang':169 'feed':168 'finance/web3':58 'gas':173 'generat':179 'geocod':175 'given':137 'header':89 'includ':160 'infer':57 'infrastructur':60 'key':18,37,97 'land':194 'limit':101 'list':108 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'manag':95 'maximum':122 'mean':84 'micropayment api' 'network':9,28,76 'no-api-key' 'offer':48 'other':216 'page':191,195 'paid':70 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-use' 'payment':82,88,143 'per':3,22,68,186 'per-cal':185 'per-call-pricing' 'platform':6,25,46,78,156 'point':189 'post':115 'post-endpoint' 'premium':110 'price':65,167,188 'prompt':201 'protocol':83 'quot':172 'rate':100,170 'rather':93 'request':69,92,116 'request/response':210 'requir':19,38 'return':196 'schema':211 'second':152 'sent':145 'sentiment':161 'specif':103 'subscript':98 'summar':164 'technic':205 'text':163 'timeout':153 'token':171 'unit':128 'unknown':218 'usdc':15,34,72,130,138 'usdc api' 'usdc-base-network' 'use':79 'util':61 'valid':176 'varieti':50 'via':10,29 'wallet':200 'x402':11,30,43,81,118 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"90fdc747-8385-4eae-8e94-474a1f29be7e","listingId":"03441a62-d2a5-4a95-9bee-89777c191a86","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/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:27.136Z"}],"sources":[{"listingId":"03441a62-d2a5-4a95-9bee-89777c191a86","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/172","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:27.136Z","lastSeenAt":"2026-04-24T18:32:16.401Z"}],"details":{"listingId":"03441a62-d2a5-4a95-9bee-89777c191a86","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/172 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/172"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls from autonomous agents via x402","Integrating low-cost per-request API access into workflows on Base network"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle payments via x402 on Base","Projects needing low-cost API calls without rate limits or signup"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.148Z"},"updatedAt":"2026-04-24T18:32:16.401Z"}}