{"id":"57f5fd9a-f948-408c-93dd-a904ad7ac29c","shortId":"2bHand","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 catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. The x402 protocol means no API keys, no accounts, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/371` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely thin: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. Without OpenAPI schemas, request/response examples, or detailed documentation, it is unclear what inputs each endpoint expects or what shape the responses take.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","All doc/pricing/API/README pages render only 'Connect wallet' with no usable content.","The specific function of /api/v1/payments/371 ('Premium API Access') is not described anywhere; it may be a generic or placeholder endpoint.","Cannot verify what data or service this endpoint actually returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/371","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/payments/371","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty ('Connect wallet' only). The purpose of this specific '/payments/371' endpoint is unclear beyond the generic 'Premium API Access' 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'/request':13,30 '0.02':12,29,68,125,188 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '20':119 '300':147 '402':114 '402 payment API' '6':130 'Base network API' 'USDC micropayment API' 'accept':152 'access':110 'account':86 'across':54 'addit':216 'address':139 'advertis':161 'ai/ml':57 'analysi':165 'analyt':56 'api':5,15,22,32,41,83,109,202 'application/json':157 'attach':93 'base':8,25,76,121,133 'beyond':193 'broad':46 'broader':159 'call':4,21 'caller':91 'catalog':47 'challeng':115 'classif':168 'connect':211 'convers':180 'data':55,182 'decim':131 'detail':218,225 'doc':201 'document':192,226 'embed':169 'enabl':40 'endpoint':53,64,102,151,162,233 'estim':177 'exact':143 'exampl':223 'exchang':172 'expect':234 'extrem':198 'feed':171 'finance/web3':59 'gas':176 'generat':183 'geocod':178 'header':96 'howev':191 'infer':58 'infrastructur':61 'input':231 'json-api' 'key':16,33,84 'land':195 'limit':90 'list':106 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'made':137 'mean':81 'network':77 'no-api-key' 'offer':44 'openapi':220 'page':196,206 'pay':2,19,50 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':49 'payment':95,135 'per':3,20,51,69 'platform':6,23,42,160 'point':190 'post':153 'post-method' 'premium':108 'price':66,170,189,203 'prompt':213 'protocol':80 'quot':175 'rate':89,173 'readm':205 'render':208 'request':52,70,99,116,154 'request/response':222 'requir':17,34 'respons':239 'return':112,156 'schema':221 'scheme':144 'second':148 'sentiment':164 'settl':71 'shape':237 'simpli':92 'sinc':127 'specif':101 'summar':167 'take':240 'technic':217 'text':166 'thin':199 'timeout':149 'token':174 'unclear':229 'unit':122 'usd':126 'usdc':9,26,73,124,128 'usdc-base' 'use':129,141 'util':62 'valid':179 'via':10,27 'wallet':212 'without':219 'x402':11,28,39,79 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"06aefb92-42d9-40f9-b79b-b2a6212cec0a","listingId":"57f5fd9a-f948-408c-93dd-a904ad7ac29c","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/payments/371","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:35.587Z"}],"sources":[{"listingId":"57f5fd9a-f948-408c-93dd-a904ad7ac29c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/371","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:35.587Z","lastSeenAt":"2026-04-24T04:03:51.275Z"}],"details":{"listingId":"57f5fd9a-f948-408c-93dd-a904ad7ac29c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/371 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/371"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/371"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to data, AI, finance, or utility endpoints without subscription commitments"],"bestFor":["Developers or agents who want zero-signup, pay-per-use API access","x402-compatible clients on the Base network","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.667Z"},"updatedAt":"2026-04-24T04:03:51.275Z"}}