{"id":"c8eab6f4-1730-47ff-9c94-71957ef429f1","shortId":"x5KSWf","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/97` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) 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 listed at $0.02 per request. However, the specific endpoint probed (`/api/v1/transfers/97`) does not clearly map to any of these advertised categories, and its actual response payload is undocumented.\n\nDocumentation is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality the `/transfers/97` endpoint actually provides. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what value it returns after payment.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for this endpoint.","The endpoint path /api/v1/transfers/97 does not correspond to any of the advertised API categories on the landing page.","Actual response payload after successful payment is completely unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/97","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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 specific endpoint path (/api/v1/transfers/97) does not match any of the advertised API categories. Effectively a stub 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'/api/v1/transfers/97':56,162 '/docs':185 '/pricing':187 '/readme':189 '/request':13,28 '/transfers/97':219 '0.02':12,27,78,154 '000':72 '20':71 '402':66 '402 payment API' '6':82 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,97 'across':113 'actual':175,221 'advertis':88,171 'ai':123 'analysi':127 'analyt':117 'api':5,20,38,61,90 'attach':100 'base':8,23,51,73 'broader':109 'call':4,19,85 'categori':115,172 'challeng':67,233 'classif':130 'clear':165 'connect':195 'content':201 'convers':147 'crypto-paid API' 'data':116,120,215 'decim':83 'descript':212 'document':180,236 'embed':131 'endpoint':55,112,150,160,220,224 'estim':141 'exampl':209 'exchang':136 'export':121 'extrem':182 'feed':135 'financ':132 'four':114 'function':217 'gas':140 'generat':148 'geocod':145 'given':79 'header':104 'howev':157 'http-post' 'i.e':77 'infrastructur':143 'insight':122 'instant':96 'key':91 'learn':125 'limit':94 'list':58,152 'live':226 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':124 'map':166 'metric':118 'network':9,24,52 'no-api-key' 'offer':111 'openapi':205 'page':190 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':177 'payment':48,103,245 'per':3,18,36,84,155 'platform':6,21,39,87,110 'premium':60 'price':134 'probe':161 'prompt':197 'protocol':44 'provid':222 'quot':139 'rate':93,137 'render':192 'report':119 'request':37,68,107,156 'request/response':208 'respond':228 'respons':176 'return':64,243 'schema':206 'sentiment':126 'simpli':99 'specif':54,159 'substant':200 'summar':129 'text':128 'thin':183 'token':138 'unclear':239 'undocu':179 'unit':74 'usdc':15,30,47,76,80 'usdc-base-network' 'use':41 'util':144 'valid':146,231 'valu':241 'via':10,25 'wallet':196 'web3':133 'without':235 'x402':11,26,43,102,232 'x402 API' 'x402-payment'","prices":[{"id":"fdb707c3-88a3-4e60-9c20-0721eac42f7b","listingId":"c8eab6f4-1730-47ff-9c94-71957ef429f1","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:13.051Z"}],"sources":[{"listingId":"c8eab6f4-1730-47ff-9c94-71957ef429f1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:13.051Z","lastSeenAt":"2026-04-22T21:31:48.519Z"}],"details":{"listingId":"c8eab6f4-1730-47ff-9c94-71957ef429f1","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/97\n# 2. Parse the 402 JSON, construct an X-PAYMENT header with a signed USDC tx,\n#    then resend:\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/97 \\\n  -H \"X-PAYMENT: <signed-payment-token>\"","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transfers/97","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists endpoints at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transfers/97"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want to avoid API key management and subscriptions","AI agents that can attach x402 payment headers autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone requiring free or high-volume bulk access at discounted rates"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.903Z"},"updatedAt":"2026-04-22T21:31:48.519Z"}}