{"id":"9914e122-8fda-44fb-b19a-6280e52feb35","shortId":"cnh2g2","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/policies/10` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request and settle in USDC on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/policies/10` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond the name itself.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","policies endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided for this endpoint","The purpose and output of /api/v1/policies/10 ('Premium API Access') is completely undocumented","Cannot verify what data or functionality is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/10","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/policies/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/call. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' or 'policies/10' actually returns. This is effectively a stub 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'/call':13,28 '0.02':12,27,78,145 '000':72 '20':71 '402':66,201 'Base network API' 'USDC API' 'accept':46 'access':62,215 'actual':192 'advertis':102 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,82,104,160,214 'attach':91 'base':8,23,51,73,153 'beyond':217 'broader':100 'call':80 'caller':89 'categori':105 'challeng':67,202 'classif':121 'connect':169 'content':175 'convers':138 'data':107,111,210 'descript':186 'doc':159 'document':154,205 'embed':122 'endpoint':55,141,191,195 'estim':132 'exampl':183 'exchang':127 'export':112 'extrem':156 'feed':126 'financ':123 'function':212 'gas':131 'generat':139 'geocod':136 'header':95 'i.e':77 'includ':106 'infrastructur':134 'insight':113 'json-response' 'key':83 'learn':116 'limit':86 'list':58 'live':197 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'micropayment API' 'multipl':103 'name':219 'network':9,24,52 'no-api-key' 'openapi':179 'page':164 'pay':2,17,35 'pay per call API' 'pay-per-request':1,16,34 'payment':48,94 'per':3,18,36,79,146 'platform':6,21,39,101 'policies endpoint' 'post-method' 'premium':60,213 'price':125,143,161 'prompt':171 'protocol':44 'provid':216 'quot':130 'rate':85,128 'readm':163 'render':166 'report':110 'request':4,19,37,68,98,147 'request/response':182 'requir':88 'return':64,193,198 'schema':180 'sentiment':117 'settl':149 'simpli':90 'spars':157 'specif':54 'summar':120 'text':119 'token':129 'unclear':208 'unit':74 'usdc':15,30,47,76,151 'usdc-base-network' 'use':41 'util':135 'valid':137,200 'via':10,25 'wallet':170 'web3':124 'without':204 'x402':11,26,43,93 'x402 API' 'x402-payment'","prices":[{"id":"68cc8258-cb15-4008-91e8-d26c90dc26f4","listingId":"9914e122-8fda-44fb-b19a-6280e52feb35","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/policies/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:54.113Z"}],"sources":[{"listingId":"9914e122-8fda-44fb-b19a-6280e52feb35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:54.113Z","lastSeenAt":"2026-04-24T00:32:16.425Z"}],"details":{"listingId":"9914e122-8fda-44fb-b19a-6280e52feb35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/10 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/10"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or policy information via a single micropayment","Integrating pay-per-use API calls into agent workflows without managing API keys","Testing x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access","Low-volume consumers who prefer per-request pricing over subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.823Z"},"updatedAt":"2026-04-24T00:32:16.425Z"}}