{"id":"2523e672-edd7-4563-9ed9-ac5cc843b110","shortId":"CMjJxj","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/payments/380` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/380` endpoint specifically returns. The endpoint path (`/payments/380`) does not clearly map to any of the advertised API categories, making its actual functionality unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The endpoint path /api/v1/payments/380 does not correspond to any of the advertised API categories, so its actual functionality is unknown","No request or response examples available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/380","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/380","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 it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the specific functionality of /api/v1/payments/380 is not described anywhere. This is effectively a stub 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'/payments/380':204 '/request':13,30,156 '0.02':12,29,82,155 '000':76 '20':75 '402':70 'Base network API' 'USDC micropayment API' 'accept':50 'access':66,96 'across':112 'actual':218 'advertis':87,213 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,166,214 'attach':99 'base':8,25,55,77 'broader':108 'call':4,21,84 'categori':114,215 'challeng':71 'classif':129 'clear':207 'connect':175 'convers':146 'crypto-paid API' 'data':115,119 'descript':193 'detail':182 'doc':165 'document':160 'embed':130 'endpoint':59,111,149,198,202 'estim':140 'exampl':190 'exchang':135 'export':120 'extrem':162 'feed':134 'financ':131 'four':113 'function':219 'gas':139 'generat':147 'geocod':144 'header':103 'howev':159 'http-post' 'i.e':81 'infrastructur':142 'insight':121 'instant':95 'key':16,33,90 'learn':124 'limit':93 'list':62,151 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'make':216 'map':208 'metric':117 'network':9,26,56 'no-api-key' 'offer':110 'openapi':186 'page':170 'path':203 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,102 'per':3,20,40,83 'platform':6,23,43,86,109 'point':158 'premium':64 'price':133,157,167 'prompt':177 'protocol':48 'quot':138 'rate':92,136 'readm':169 'render':172 'report':118 'request':41,72,106 'request/response':189 'requir':17,34 'return':68,200 'schema':187 'sentiment':125 'simpli':98 'specif':58,199 'summar':128 'technic':181 'text':127 'thin':163 'token':137 'unclear':220 'unit':78 'usdc':51,80 'usdc-base-network' 'use':45 'util':143 'valid':145 'via':10,27 'wallet':176 'web3':132 'x402':11,28,47,101 'x402 API' 'x402-payment'","prices":[{"id":"d86b507c-f5cd-4e33-874e-90a4f2a1c133","listingId":"2523e672-edd7-4563-9ed9-ac5cc843b110","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/380","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:38.057Z"}],"sources":[{"listingId":"2523e672-edd7-4563-9ed9-ac5cc843b110","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/380","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:38.057Z","lastSeenAt":"2026-04-23T21:32:17.620Z"}],"details":{"listingId":"2523e672-edd7-4563-9ed9-ac5cc843b110","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/380 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/380"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-request API endpoints without managing API keys or subscriptions","Making micropayment-gated API calls settled in USDC on Base","Programmatic access to data, AI, finance, or utility endpoints via x402 protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Projects already operating on the Base L2 network with USDC"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Production systems requiring well-documented request/response schemas","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.547Z"},"updatedAt":"2026-04-23T21:32:17.620Z"}}