{"id":"e5ad5d10-036b-4527-9959-08b1c8761df5","shortId":"KaNLWz","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 across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.\n\nThe specific endpoint at `/api/v1/payments/233` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" 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 generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all subpages just show \"Connect wallet\"), so the actual request/response schemas for individual endpoints are unknown. Without documentation or OpenAPI specs, callers will need to experiment to discover input parameters and output formats.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — all doc/pricing/API pages return only 'Connect wallet'","The specific functionality of /api/v1/payments/233 ('Premium API Access') is not described anywhere","Request body format and response structure are completely unknown","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/233","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/233","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 it works. However, there is no OpenAPI spec, no documentation (all doc pages are empty), no request/response schema, and the specific purpose of the /payments/233 endpoint beyond 'Premium API Access' is unclear. This is effectively a stub 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'/request':13,28 '0.02':12,27,59,130,183 '000':119 '0x8335':124 '20':118 '2913':125 '300':143 '402':113 '402 payment api' '6':134 'accept':148 'access':109 'across':45 'actual':203 'advertis':157 'ai/ml':48 'analysi':161 'analyt':47 'api':5,20,37,71,108 'application/json':153 'attach':87 'base':8,23,67,120,127 'base network api' 'beyond':188 'broader':155 'call':4,19 'caller':86,216 'challeng':114 'classif':164 'commit':78 'connect':199 'convers':176 'data':46 'decim':135 'discov':222 'document':187,212 'embed':165 'empti':194 'enabl':36 'endpoint':44,55,101,147,158,208 'equal':129 'essenti':193 'estim':173 'exact':140 'exchang':168 'experi':220 'feed':167 'finance/web3':50 'format':227 'gas':172 'generat':178 'geocod':174 'given':131 'handl':83 'header':90 'howev':186 'immedi':98 'individu':207 'infer':49 'infrastructur':52 'inlin':85 'input':223 'json-response' 'key':72 'land':190 'limit':75 'list':105 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'need':218 'network':9,24,68 'no-api-key' 'offer':40 'openapi':214 'output':226 'page':191 'paramet':224 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':62 'payment':84,89,137 'per':3,18,60 'platform':6,21,38,156 'point':185 'post':149 'post-method' 'premium':107 'price':57,166,184 'protocol':82 'quot':171 'rate':74,169 'receiv':95 'request':61,93,115,150 'request/response':204 'requir':79 'respons':97 'return':111,152 'schema':205 'scheme':138 'second':144 'sentiment':160 'show':198 'spec':215 'specif':100 'subpag':196 'summar':163 'text':162 'timeout':145 'token':170 'unit':121 'unknown':210 'usdc':15,30,64,123,132 'usdc api' 'usdc-base-network' 'util':53 'valid':175 'varieti':42 'via':10,25 'wallet':200 'without':211 'x402':11,26,35,81 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"eecbe78c-6bb9-4ba1-9f80-d2ee5339950d","listingId":"e5ad5d10-036b-4527-9959-08b1c8761df5","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/233","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:59.638Z"}],"sources":[{"listingId":"e5ad5d10-036b-4527-9959-08b1c8761df5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/233","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:59.638Z","lastSeenAt":"2026-04-24T06:32:16.743Z"}],"details":{"listingId":"e5ad5d10-036b-4527-9959-08b1c8761df5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/233 \\\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":"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 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/233"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to various utility and data APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol with minimal cost","AI agents needing keyless, pay-per-call API access","Projects wanting to avoid subscription commitments for occasional API usage"],"notFor":["Production workloads requiring well-documented request/response schemas","Use cases needing detailed SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.354Z"},"updatedAt":"2026-04-24T06:32:16.743Z"}}