{"id":"562dd94d-b7c8-4e1c-84b0-a7b46aba6af2","shortId":"SrD6SY","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/31` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — each request is paid for individually via an X-PAYMENT header containing a signed payment.\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 listed at the same $0.02/request price point.\n\nHowever, the specific functionality of the `/api/v1/transfers/31` endpoint is unclear. The description simply says \"Premium API Access\" with no further documentation about what data or service it returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical content. Without schema details or response examples, the actual behavior of this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto-payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto API access"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content.","The specific purpose and response format of /api/v1/transfers/31 is unknown; 'Premium API Access' is not descriptive.","No OpenAPI spec, no request schema, and no response schema are provided.","The broader platform lists many API categories (AI, finance, data, infrastructure) but none are documented — it is unclear whether these endpoints are functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/31","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation about what the endpoint actually does, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. The 'Premium API Access' label is generic and 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'/request':13,28,152 '0.02':12,27,65,151 '000':69 '20':68 '402 payment API' '6':75 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,171 'actual':208 'addit':198 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,78,108,170,187 'base':8,23,51,70 'behavior':209 'broader':104 'call':4,19,67 'categori':109 'classif':125 'commit':84 'connect':193 'contain':99 'content':200 'convers':142 'cost':64 'crypto API access' 'data':111,115,178 'decim':76 'descript':166 'detail':203 'doc':184 'document':175 'embed':126 'endpoint':55,145,162,212 'estim':136 'exampl':206 'exchang':131 'export':116 'feed':130 'financ':127 'function':158 'gas':135 'generat':143 'geocod':140 'header':98 'howev':155 'http-post' 'includ':110 'individu':92 'infrastructur':138 'insight':117 'key':79 'learn':120 'limit':81 'list':58,147 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'multipl':107 'network':9,24,52 'no-api-key' 'page':188 'paid':90 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,97,102 'per':3,18,36,66 'platform':6,21,39,105 'point':154 'premium':60,169 'price':129,153,185 'prompt':195 'protocol':44 'quot':134 'rate':80,132 'remain':213 'render':190 'report':114 'request':37,88 'requir':86 'respons':205 'return':182 'say':168 'schema':202 'sentiment':121 'servic':180 'sign':101 'simpli':167 'specif':54,157 'summar':124 'technic':199 'text':123 'token':133 'unclear':164 'unit':71 'unknown':214 'upfront':83 'usdc':15,30,47,73 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25,93 'wallet':194 'web3':128 'without':201 'x':96 'x-payment':95 'x402':11,26,43 'x402 API' 'x402-payment'","prices":[{"id":"0959ec14-daa0-470e-bff7-11956638eb10","listingId":"562dd94d-b7c8-4e1c-84b0-a7b46aba6af2","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:45.246Z"}],"sources":[{"listingId":"562dd94d-b7c8-4e1c-84b0-a7b46aba6af2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:45.246Z","lastSeenAt":"2026-04-22T04:02:11.945Z"}],"details":{"listingId":"562dd94d-b7c8-4e1c-84b0-a7b46aba6af2","quickStartSnippet":"# The endpoint requires an x402 payment header with a signed USDC payment on Base.\n# Using curl (you need an x402-compatible client to generate the X-PAYMENT header):\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/31 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/31"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/31"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Agent-driven workflows that settle API costs in USDC on Base","Accessing premium data or services with instant crypto micropayments"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents with USDC wallets on Base network","Prototyping integrations without signup or billing setup"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where per-request pricing may be less economical than bulk plans","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.098Z"},"updatedAt":"2026-04-22T04:02:11.945Z"}}