{"id":"6d4a7e22-71f7-43b6-9f32-d98924618e7e","shortId":"C7HqMu","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/transfers/152` 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\nThe specific functionality behind `/api/v1/transfers/152` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional documentation. There is no OpenAPI spec, no request/response schema, and no usage examples available. The endpoint is live and responds with a well-formed x402 challenge, but the actual payload it returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","usdc api access","pay per call api","base network api","402 payment api"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for /api/v1/transfers/152.","The specific functionality of 'Premium API Access' at this endpoint path is completely undocumented.","Cannot verify what data or service is returned after successful payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/152","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/transfers/152","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 zero documentation on what the endpoint actually does or returns. No OpenAPI spec, no request/response examples, and the docs/pricing/API pages are all behind a wallet-connect gate. The listing is effectively a stub with confirmed 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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':62,92,172 'across':112 'actual':219 'addit':189 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,171,178 'attach':95 'avail':203 'base':8,23,51,73 'base network api' 'behind':162 'beyond':167 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67,216 'classif':129 'connect':184 'convers':146 'crawl':174 'data':115,119 'doc':175 'document':166,190 'embed':130 'endpoint':55,111,149,205 'estim':140 'exampl':202 'exchang':135 'export':120 'feed':134 'financ':131 'form':214 'four':113 'function':161 'gas':139 'generat':147 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'key':86 'label':169 'learn':124 'limit':89 'list':58,151 'live':207 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'openapi':194 'page':179 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payload':220 'payment':48,99,105,224 'per':3,18,36,79 'platform':6,21,39,82,109 'point':158 'post-endpoint' 'premium':60,170 'price':133,157,176 'prompt':186 'proof':106 'protocol':44 'quot':138 'rate':88,136 'render':181 'report':118 'request':37,68 'request/response':197 'respond':209 'return':64,222 'schema':198 'sentiment':125 'simpli':94 'spec':195 'specif':54,160 'summar':128 'text':127 'token':137 'unit':74 'unknown':226 'usag':201 'usdc':15,30,47,76 'usdc api access' 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':185 'web3':132 'well':213 'well-form':212 'x':98 'x-payment':97 'x402':11,26,43,104,215 'x402 api' 'x402-payment'","prices":[{"id":"c7660bdb-9f77-4f56-8582-a8cb58a61f95","listingId":"6d4a7e22-71f7-43b6-9f32-d98924618e7e","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/transfers/152","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:29.458Z"}],"sources":[{"listingId":"6d4a7e22-71f7-43b6-9f32-d98924618e7e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/152","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:29.458Z","lastSeenAt":"2026-04-23T04:02:06.155Z"}],"details":{"listingId":"6d4a7e22-71f7-43b6-9f32-d98924618e7e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/152 \\\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/transfers/152"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.","source_url":"https://lowpaymentfee.com/api/v1/transfers/152"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Low-volume consumers who prefer pay-per-call over subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.923Z"},"updatedAt":"2026-04-23T04:02:06.155Z"}}