{"id":"c4bebca4-3eb1-49d9-8ba7-f44c9098963a","shortId":"Z2xx94","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/invoices/2` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) 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\nThis particular endpoint (`/api/v1/invoices/2`) is live and returns a proper 402 challenge. However, the documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this endpoint and others are unknown. There is no OpenAPI spec or detailed documentation available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","invoice api"],"warnings":["No OpenAPI specification or detailed documentation available","All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no content","The actual request body schema and response format for /api/v1/invoices/2 are completely unknown","The endpoint name 'Premium API Access' is generic and does not describe what data or service is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/2","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/invoices/2","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 beyond a landing page listing, no request/response schema, and all doc pages return only 'Connect wallet'. The actual functionality behind '/api/v1/invoices/2' is 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'/request':13,28,150 '0.02':12,27,75,149 '000':70 '20':69 '402':163 'accept':46 'access':61,90 'across':106 'actual':185 'advertis':81 'ai':116 'analysi':120 'analyt':110 'api':5,20,38,60,83 'attach':93 'avail':203 'base':8,23,51,71 'base network api' 'broader':102 'call':4,19,78 'categori':108 'challeng':164 'classif':123 'connect':176 'content':182 'convers':140 'crawl':206 'data':109,113 'detail':201 'doc':169 'document':167,202 'embed':124 'endpoint':55,105,143,155,190 'estim':134 'exchang':129 'export':114 'feed':128 'financ':125 'four':107 'gas':133 'generat':141 'geocod':138 'header':97 'howev':165 'infrastructur':136 'insight':115 'instant':89 'invoice api' 'json-response' 'key':84 'label':58 'learn':118 'limit':87 'list':145 'live':158 'low payment fee' 'lowpaymentfee.com':31 'machin':117 'metric':111 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':104 'openapi':198 'other':192 'page':168 'particular':154 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,65,96 'per':3,18,36,77 'platform':6,21,39,80,103 'point':152 'post-method' 'premium':59 'price':127,151,170 'prompt':178 'proper':162 'protocol':44 'quot':132 'rate':86,130 'readm':171 'report':112 'request':37,100 'request/response':186 'requir':63 'return':160,173 'schema':187 'sentiment':119 'simpli':92 'spec':199 'specif':54 'substant':181 'summar':122 'text':121 'token':131 'unit':72 'unknown':194 'usd':76 'usdc':15,30,47,74 'usdc api' 'usdc-base-network' 'use':41 'util':137 'valid':139 'via':10,25 'wallet':177 'web3':126 'x402':11,26,43,95 'x402 api' 'x402-payment'","prices":[{"id":"85ea321f-0eca-4f1e-8680-0308094321f2","listingId":"c4bebca4-3eb1-49d9-8ba7-f44c9098963a","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/invoices/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:10.103Z"}],"sources":[{"listingId":"c4bebca4-3eb1-49d9-8ba7-f44c9098963a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:10.103Z","lastSeenAt":"2026-04-25T03:02:23.142Z"}],"details":{"listingId":"c4bebca4-3eb1-49d9-8ba7-f44c9098963a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/2 \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/invoices/2"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/invoices/2"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Programmatic invoice retrieval without subscription or API key management","Agent-driven API consumption where each call is individually settled on-chain"],"bestFor":["Developers wanting zero-commitment pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional API subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.655Z"},"updatedAt":"2026-04-25T03:02:23.142Z"}}