{"id":"9b5983d9-11dd-4879-b1d0-08c107c4587f","shortId":"LtHFwx","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request 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/66` 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. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four categories: 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.\n\nThis particular endpoint (`/api/v1/policies/66`) is labeled \"Premium API Access\" but its actual functionality is unclear — the crawled documentation pages returned only \"Connect wallet\" placeholders with no further detail on request/response schemas or what data the policies endpoint returns. The payment mechanism is confirmed live via the 402 challenge, but the lack of documentation about what the endpoint actually does is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","policies API","premium API access"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' placeholder content","Unknown functionality: what /api/v1/policies/66 actually returns is not documented anywhere in the crawl","No request or response schema available; callers cannot know what to send or expect back","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/66","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/policies/66 endpoint actually returns. The docs, pricing, API, and README pages all render only a 'Connect wallet' placeholder. This is effectively a stub 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66,202 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,164 'across':112 'actual':167,213 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,163 'attach':95 'base':8,23,51,73 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67,203 'classif':129 'confirm':198 'connect':177 'convers':146 'crawl':172 'data':115,119,189 'detail':183 'document':173,208 'embed':130 'endpoint':55,111,149,158,192,212 'estim':140 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':168 'gap':218 'gas':139 'generat':147 'geocod':144 'header':100 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':161 'lack':206 'learn':124 'limit':89 'list':58 'live':199 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'mechan':196 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'page':174 'particular':157 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105,195 'per':3,18,36,79,154 'placehold':179 'platform':6,21,39,82,109 'polici':191 'policies API' 'premium':60,162 'premium API access' 'price':133,151 'proof':106 'protocol':44 'quot':138 'rate':88,136 'report':118 'request':37,68,155 'request/response':185 'return':64,175,193 'schema':186 'sentiment':125 'signific':217 'simpli':94 'specif':54 'summar':128 'text':127 'token':137 'unclear':170 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25,200 'wallet':178 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"7479d457-61c1-4d30-86f3-669eaa43083d","listingId":"9b5983d9-11dd-4879-b1d0-08c107c4587f","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:06.300Z"}],"sources":[{"listingId":"9b5983d9-11dd-4879-b1d0-08c107c4587f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:06.300Z","lastSeenAt":"2026-04-24T00:32:16.980Z"}],"details":{"listingId":"9b5983d9-11dd-4879-b1d0-08c107c4587f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/66 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/66"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/66"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to platform services"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.202Z"},"updatedAt":"2026-04-24T00:32:16.980Z"}}