{"id":"12d101c1-74ba-4661-8ede-3b197fd0fdf5","shortId":"K5b8Ek","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 an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/90` is listed as \"Premium API Access\" and carries a max amount of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) on Base. The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nThe platform advertises categories including analytics/metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior, input/output schemas, and data sources behind each endpoint remain undocumented and unverifiable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method","json-response"],"categories":["general","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no content — only a 'Connect wallet' prompt.","No input or output schema is available for this endpoint; actual behavior is unknown.","The endpoint path '/api/v1/transfers/90' and description 'Premium API Access' are generic and do not clarify what data or service is provided.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none are documented or verifiable."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/90","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/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the docs/pricing/README pages are all empty stubs. The actual functionality behind '/api/v1/transfers/90' is completely opaque — the name 'Premium API Access' is generic and 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'/request':13,28 '0.02':12,27,64,116 '000':110 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':150 '20':109 '6':120 'Base network API' 'USDC micropayment API' 'accept':136 'access':102 'account':76 'across':46 'actual':200 'address':144 'advertis':155 'ai/ml':49 'amount':107 'analysi':164 'analyt':48 'analytics/metrics':158 'api':5,20,37,74,101 'attach':84 'base':8,23,71,111,123,152 'behavior':201 'behind':207 'broad':42 'call':4,19 'caller':82 'captur':129 'carri':104 'categori':156 'challeng':126 'classif':167 'confirm':130 'connect':191 'content':197 'contract':149 'convers':179 'crypto-paid API' 'data':47,52,160,205 'decim':121 'doc':185 'document':183 'embed':168 'enabl':36 'endpoint':45,57,94,132,209 'estim':176 'exchang':171 'export':161 'feed':170 'finance/web3':51 'gas':175 'generat':181 'geocod':177 'given':117 'header':88 'howev':182 'i.e':115 'includ':157 'infer':50 'input/output':202 'insight':162 'json-response' 'key':75 'limit':79 'list':98 'live':134 'lowpaymentfee' 'lowpaymentfee.com':31 'max':106 'network':9,24,72 'no-api-key' 'offer':40 'page':184 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87,140 'per':3,18,61 'platform':6,21,38,154 'post':137 'post-method' 'premium':100 'premium API access' 'price':169,186 'prompt':193 'quot':174 'rate':78,172 'readm':187 'remain':210 'report':159 'request':62,91,138 'requir':81 'return':188 'schema':203 'sentiment':163 'servic':55 'set':43 'settl':66,142 'simpli':83 'sourc':206 'specif':93 'substant':196 'success':128 'summar':166 'text':165 'token':173 'undocu':211 'unit':112 'unverifi':213 'usdc':15,30,68,114,118,148 'usdc-base' 'use':146 'util':54 'valid':178 'via':10,25 'wallet':192 'x402':11,26,35,86,125 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"f338a016-3180-42fa-9a78-c909374ffce5","listingId":"12d101c1-74ba-4661-8ede-3b197fd0fdf5","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/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:06.330Z"}],"sources":[{"listingId":"12d101c1-74ba-4661-8ede-3b197fd0fdf5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:06.330Z","lastSeenAt":"2026-04-22T07:31:57.662Z"}],"details":{"listingId":"12d101c1-74ba-4661-8ede-3b197fd0fdf5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/90 \\\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":"Endpoint returns 402 with x402 challenge, confirming it is live on Base network with USDC payment","source_url":"https://lowpaymentfee.com/api/v1/transfers/90"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/90"},{"claim":"Documentation, pricing, and README pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Micropayment-gated data retrieval or utility calls","Testing x402 payment flows on Base network"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents needing keyless, pay-as-you-go API access on Base","Low-friction one-off API calls without account setup"],"notFor":["Production workloads requiring documented input/output schemas and SLAs","Users who need free or subscription-based API access","Applications requiring high-throughput with predictable billing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.147Z"},"updatedAt":"2026-04-22T07:31:57.662Z"}}