{"id":"71aefff5-930d-405c-8644-8296b6c67d32","shortId":"yyd7Pt","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/65` 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 listed at the same $0.02/request price point.\n\nThis particular endpoint (`/api/v1/policies/65`) is labeled \"Premium API Access\" but its actual functionality is unclear — the crawled documentation pages returned only wallet-connect stubs with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The endpoint is live and responds with a well-formed x402 challenge, but what data or service it returns upon successful payment is not documented in the material gathered.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — all doc pages return only a 'Connect wallet' stub","The specific functionality of /api/v1/policies/65 ('Premium API Access') is not described anywhere in the crawled material","No OpenAPI schema or request/response examples are available","No way to verify what data or service is returned after payment without actually paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/65","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/policies/65 is completely undocumented. The docs, pricing, API, and README pages all returned only 'Connect wallet' 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'/request':13,28,156 '0.02':12,27,78,155 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92,167 'across':112 'actual':170 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,166 'attach':95 'avail':200 'base':8,23,51,73 'base network api' 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67,216 'classif':129 'connect':182 'content':187 'convers':146 'crawl':175,203 'data':115,119,219 'detail':198 'document':176,199,229 'embed':130 'endpoint':55,111,149,161,205 'estim':140 'exampl':195 'exchang':135 'export':120 'feed':134 'financ':131 'form':214 'four':113 'function':171 'gas':139 'gather':233 'generat':147 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':164 'learn':124 'limit':89 'list':58,151 'live':207 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'materi':232 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'openapi':191 'page':177 'particular':160 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105,226 'per':3,18,36,79 'platform':6,21,39,82,109 'point':158 'post-method' 'premium':60,165 'price':133,157 'proof':106 'protocol':44 'quot':138 'rate':88,136 'report':118 'request':37,68 'request/response':194 'respond':209 'return':64,178,223 'schema':192 'sentiment':125 'servic':221 'simpli':94 'specif':54 'stub':183 'substant':186 'success':225 'summar':128 'text':127 'token':137 'unclear':173 'unit':74 'upon':224 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':181 'wallet-connect':180 'web3':132 'well':213 'well-form':212 'x':98 'x-payment':97 'x402':11,26,43,104,215 'x402 api' 'x402-payment'","prices":[{"id":"bc571957-6f3b-472a-8f63-267a90004b58","listingId":"71aefff5-930d-405c-8644-8296b6c67d32","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:05.671Z"}],"sources":[{"listingId":"71aefff5-930d-405c-8644-8296b6c67d32","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:05.671Z","lastSeenAt":"2026-04-24T00:32:16.955Z"}],"details":{"listingId":"71aefff5-930d-405c-8644-8296b6c67d32","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/65 \\\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/65"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/65"},{"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 various data and utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.203Z"},"updatedAt":"2026-04-24T00:32:16.955Z"}}