{"id":"dbfdcdd9-2383-4a8b-9e0a-d50c557a1463","shortId":"F5Xstu","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/146` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\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 uniformly at $0.02 per request.\n\nHowever, the specific functionality of the `/api/v1/transfers/146` endpoint is not documented beyond its title \"Premium API Access.\" The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for any endpoint. The endpoint is confirmed live (402 challenge captured), but what it actually returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access","402 payment protocol"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content","The specific endpoint /api/v1/transfers/146 is not listed among the advertised API categories on the homepage","No OpenAPI schema or request/response examples available","Actual response payload after payment is completely unknown","The platform's advertised endpoints (AI, analytics, finance, etc.) may be placeholders — no evidence of real functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/146","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/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The specific endpoint path '/api/v1/transfers/146' doesn't match any of the advertised categories, making its purpose 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'/request':13,28 '0.02':12,27,77,150 '000':72 '20':71 '402':66,208 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,169 'across':108 'actual':214 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,168,174 'attach':95 'avail':199 'base':8,23,51,73 'beyond':164 'broader':104 'call':4,19,80 'captur':210 'categori':110 'challeng':67,209 'classif':125 'confirm':206 'connect':180 'content':186 'convers':142 'crypto API access' 'data':111,115 'detail':197 'doc':171 'document':163,198 'embed':126 'endpoint':55,107,145,160,202,204 'estim':136 'exampl':194 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':156 'gas':135 'generat':143 'geocod':140 'header':99 'howev':153 'http-post' 'infrastructur':138 'insight':117 'instant':91 'key':86 'learn':120 'limit':89 'list':58 'live':207 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':190 'page':175 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98,217 'per':3,18,36,79,151 'platform':6,21,39,82,105 'premium':60,167 'price':129,147,172 'prompt':182 'protocol':44 'quot':134 'rate':88,132 'render':177 'report':114 'request':37,68,102,152 'request/response':193 'return':64,215 'schema':191 'sentiment':121 'simpli':94 'specif':54,155 'summar':124 'text':123 'titl':166 'token':133 'uniform':148 'unit':74 'unknown':219 'usd':78 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':181 'web3':128 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"7e981ca5-1a89-432a-b85e-a3f14f0ee24f","listingId":"dbfdcdd9-2383-4a8b-9e0a-d50c557a1463","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/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:34.987Z"}],"sources":[{"listingId":"dbfdcdd9-2383-4a8b-9e0a-d50c557a1463","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:34.987Z","lastSeenAt":"2026-04-22T04:02:11.287Z"}],"details":{"listingId":"dbfdcdd9-2383-4a8b-9e0a-d50c557a1463","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/146 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/146"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and API pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API data with per-request USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Users who want per-request billing without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base network USDC wallet","Production workloads requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.692Z"},"updatedAt":"2026-04-22T04:02:11.287Z"}}