{"id":"427d6e74-8f23-41f5-bdc6-613ee56f5b8f","shortId":"4KaWRx","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/32` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 uniformly priced at $0.02 per request.\n\nHowever, the specific functionality of the `/api/v1/transfers/32` 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 on the site all render only a \"Connect wallet\" prompt with no additional technical documentation, OpenAPI schema, or usage examples. Callers should be aware that the actual response payload and input parameters for this endpoint are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available for /api/v1/transfers/32 — the actual functionality and response format are unknown","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content","No OpenAPI or schema describing input parameters or output format","The endpoint path '/api/v1/transfers/32' suggests a resource-specific route but its meaning is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/32","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/32","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 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation of what this specific endpoint does, no OpenAPI schema, no example requests or responses, and the site's docs/pricing/API pages are all blank beyond a wallet-connect prompt. The endpoint's purpose is essentially 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'/request':13,28 '0.02':12,27,80,152 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,171 'actual':215 'addit':201 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,170,187 'attach':93 'awar':212 'base':8,23,51,75 'broader':106 'call':4,19,82 'caller':91,209 'categori':111 'challeng':67 'classif':127 'connect':196 'convers':144 'crypto-paid API' 'data':113,117,178 'descript':166 'doc':184 'document':175,203 'embed':128 'endpoint':55,147,162,223 'estim':138 'exampl':208 'exchang':133 'export':118 'feed':132 'financ':129 'function':158 'gas':137 'generat':145 'geocod':142 'header':98 'howev':155 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'input':219 'insight':119 'key':85 'learn':122 'limit':88 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'openapi':204 'page':188 'paramet':220 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':217 'payment':48,69,97,103 'per':3,18,36,81,153 'platform':6,21,39,107 'premium':60,169 'premium API access' 'price':131,150,185 'prompt':198 'proof':104 'protocol':44 'quot':136 'rate':87,134 'render':193 'report':116 'request':37,154 'requir':68,90 'respons':216 'return':64,182 'say':168 'schema':205 'sentiment':123 'servic':180 'simpli':92,167 'site':191 'specif':54,157 'summar':126 'technic':202 'text':125 'token':135 'unclear':164 'undocu':225 'uniform':149 'unit':76 'usag':207 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':197 'web3':130 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"798d8eec-7065-43aa-907f-cac947541c09","listingId":"427d6e74-8f23-41f5-bdc6-613ee56f5b8f","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:47.612Z"}],"sources":[{"listingId":"427d6e74-8f23-41f5-bdc6-613ee56f5b8f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:47.612Z","lastSeenAt":"2026-04-23T20:03:20.665Z"}],"details":{"listingId":"427d6e74-8f23-41f5-bdc6-613ee56f5b8f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/32 \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/32"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/32"}],"useCases":["Accessing a pay-per-request API endpoint without needing API key registration","Making micropayments in USDC on Base for on-demand API calls","Integrating x402-compatible agents with a low-cost per-call endpoint"],"bestFor":["Developers or agents already set up with x402 payment flows on Base","Use cases requiring no-signup, no-rate-limit API access","Micropayment experimentation with USDC on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone needing to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.086Z"},"updatedAt":"2026-04-23T20:03:20.665Z"}}