{"id":"907ad543-fd73-46be-b413-2075f59b7e5a","shortId":"pFLG8j","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 variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request using the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/transfers/171` is listed as \"Premium API Access\" and accepts POST requests.\n\nThe platform advertises a flat $0.02 per request across its catalog, with no API keys, no rate limits, and no minimum commitments required. The x402 challenge captured from this endpoint shows a maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — 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 detailed description of what the `/api/v1/transfers/171` endpoint actually returns. The broader site lists categories (analytics, AI, finance, infrastructure) but provides no specifics about data sources, model details, or response formats. The endpoint is confirmed live (402 challenge returned), but the lack of documentation makes it difficult to assess actual functionality.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-endpoint","no-api-key"],"categories":["api-platform","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"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 /api/v1/transfers/171","The endpoint name 'Premium API Access' is generic and does not describe actual functionality","Cannot verify what data or service this endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/171","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/171","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no description of what this specific endpoint actually does beyond the generic label 'Premium API Access'. The docs/pricing/API pages are all empty wallet-connect 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'/request':13,28 '0.02':12,27,94,133 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':128 '20000':123 '300':151 '402':221 '6':137 'accept':86 'access':84 'across':97 'actual':193,234 'address':147 'advertis':91 'ai':201 'ai/ml':48 'analyt':47,200 'api':5,20,37,83,102,160 'assess':233 'base':8,23,72,124,130 'base network api' 'base-network' 'broader':196 'call':4,19 'captur':115 'catalog':99 'categori':199 'challeng':114,222 'commit':110 'confirm':219 'connect':169 'content':175 'data':46,51,209 'decim':138 'descript':187 'detail':186,212 'difficult':231 'doc':159 'document':154,228 'enabl':36 'endpoint':44,56,76,118,192,217 'equal':132 'exact':144 'exampl':183 'extrem':156 'financ':202 'finance/web3':50 'flat':93 'format':215 'function':235 'given':134 'infer':49 'infrastructur':203 'key':103 'lack':226 'limit':106 'list':80,198 'live':220 'low payment fee' 'lowpaymentfee.com':31 'made':141 'make':229 'maxamountrequir':121 'micropayment api' 'minimum':109 'model':211 'network':9,24,73 'no-api-key' 'offer':40 'openapi':179 'page':164 'pay':2,17,59 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':58 'payment':67,139 'per':3,18,60,95 'platform':6,21,38,90 'post':87 'post-endpoint' 'premium':82 'premium api access' 'price':161 'prompt':171 'protocol':65 'provid':205 'rate':105 'readm':163 'render':166 'request':61,88,96 'request/response':182 'requir':111 'respons':214 'return':194,223 'schema':180 'scheme':145 'second':152 'servic':54 'settl':66 'show':119 'site':197 'sourc':210 'span':45 'spars':157 'specif':75,207 'substant':174 'timeout':153 'unit':125 'usdc':15,30,69,127,135 'usdc api' 'usdc-settlement' 'use':62 'util':53 'varieti':42 'via':10,25,142 'wallet':170 'x402':11,26,35,64,113 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"800c10c5-af55-4ae5-836f-a8f7b1fa4054","listingId":"907ad543-fd73-46be-b413-2075f59b7e5a","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/171","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:31.900Z"}],"sources":[{"listingId":"907ad543-fd73-46be-b413-2075f59b7e5a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/171","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:31.900Z","lastSeenAt":"2026-04-22T05:31:46.385Z"}],"details":{"listingId":"907ad543-fd73-46be-b413-2075f59b7e5a","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/171 \\\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":"Flat pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/transfers/171"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/171"}],"useCases":["Accessing pay-per-call API services without API key registration","Making micropayments for API access using USDC on Base","Agent-driven API consumption with x402 payment protocol"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","x402-compatible agents that can settle USDC on Base","Users who prefer no-signup, wallet-based API authentication"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume consumers who need bulk pricing or rate guarantees","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.811Z"},"updatedAt":"2026-04-22T05:31:46.385Z"}}