{"id":"7d17ddb1-c405-4d8b-9dc1-1301242adfc2","shortId":"ubaD7y","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to each request.\n\nThe specific endpoint at `/api/v1/transfers/109` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform also hosts endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/transfers/109` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond its name.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or JSON schema provided for request or response","The purpose of '/api/v1/transfers/109' ('Premium API Access') is completely undocumented","Cannot verify what data or functionality this specific endpoint returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/109","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/109","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 pricing and network. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what 'Premium API Access' at /transfers/109 actually does. The listing is essentially a 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'/request':13,30 '0.02':12,29,63,140,175 '0x8335':134 '20000':129 '2913':135 '402':226 '402 payment API' '6':144 'Base network API' 'USDC API' 'accept':119 'access':117,240 'actual':217 'advertis':125 'ai/ml':53 'also':148 'analysi':153 'analyt':52 'api':5,15,22,32,41,81,116,184,239 'attach':92 'base':8,25,71,130,137 'beyond':242 'broad':46 'call':4,21 'caller':90 'challeng':124,227 'classif':156 'commit':89 'connect':193 'content':199 'convers':168 'cost':62 'data':51,56,235 'decim':145 'descript':211 'detail':210 'doc':183 'document':178,230 'embed':157 'enabl':40 'endpoint':49,61,109,150,216,220 'equal':139 'estim':165 'everi':60 'exampl':207 'exchang':160 'extrem':180 'feed':159 'finance/web3':55 'function':237 'gas':164 'generat':170 'geocod':166 'given':141 'header':97 'host':149 'infer':54 'infrastructur':58 'json-response' 'key':16,33,82 'limit':85 'list':113 'live':222 'lowpaymentfee' 'lowpaymentfee.com':35 'maxamountrequir':127 'micropayment API' 'name':244 'network':72 'no-api-key' 'offer':44 'openapi':203 'page':188 'paid':66 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':76,96,102 'per':3,20,64 'platform':6,23,42,147 'point':177 'post':120 'post-endpoint' 'premium':115,238 'price':158,176,185 'prompt':195 'proof':103 'proper':225 'protocol':77 'provid':241 'quot':163 'rate':84,161 'readm':187 'render':190 'request':65,106,121 'request/response':206 'requir':17,34 'return':218,223 'schema':204 'sentiment':152 'set':47 'simpli':91 'span':50 'spars':181 'specif':108 'summar':155 'text':154 'token':162 'unclear':233 'unit':131 'upfront':88 'usdc':9,26,68,133,142 'usdc-base' 'util':59 'valid':100,167 'via':10,27,73 'wallet':194 'without':229 'x':95 'x-payment':94 'x402':11,28,39,75,101,123 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"cf91a7e0-b917-456d-8670-d9d554bd9fb3","listingId":"7d17ddb1-c405-4d8b-9dc1-1301242adfc2","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/109","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:21.581Z"}],"sources":[{"listingId":"7d17ddb1-c405-4d8b-9dc1-1301242adfc2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/109","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:21.581Z","lastSeenAt":"2026-04-22T07:01:39.839Z"}],"details":{"listingId":"7d17ddb1-c405-4d8b-9dc1-1301242adfc2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/109 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/109"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/109"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic transfers or data retrieval without subscription overhead"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base who want frictionless API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription-based pricing for cost efficiency","Developers on networks other than Base (only Base USDC is accepted)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.278Z"},"updatedAt":"2026-04-22T07:01:39.839Z"}}