{"id":"0221e8fc-863d-4a88-94b5-e6e3b1ac31c0","shortId":"2j3D5f","kind":"x402","title":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint being listed here — `/api/v1/orders/77` — is described as \"Premium API Access\" and returns a live 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The x402 protocol means no API keys or accounts are needed; callers attach an `X-PAYMENT` header with a signed payment to access the resource. The platform advertises no rate limits, no minimums, and instant access.\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 documentation for any endpoint. It is unclear what the `/api/v1/orders/77` endpoint specifically returns or what input it expects beyond a POST request. The broader catalog of endpoints listed on the homepage suggests a multi-purpose API suite, but without documentation or schemas, the actual functionality and data quality cannot be verified.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","no-api-key"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","crypto api payments","serverless api marketplace"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or JSON schema for any endpoint","The specific endpoint /api/v1/orders/77 has no description beyond 'Premium API Access'; its actual functionality is unknown","No request or response examples available","The broad catalog of 16+ endpoints listed on the homepage cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/77","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/orders/77","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 accepts USDC payments on Base. However, documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/orders/77 is unclear beyond the generic 'Premium API Access' label. The homepage lists many endpoints but provides no detail on any of 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'/call':19,38 '0.02':18,37,99,138 '000':132 '20':131 '402':126 'access':121,164,177 'account':149 'across':58 'actual':255 'advertis':169 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,120,146,184,247 'attach':153 'base':8,27,107,133,140 'base usdc api' 'beyond':229 'broad':50 'broader':234 'caller':152 'cannot':260 'catalog':51,235 'categori':60 'challeng':127 'classif':75 'classification' 'connect':193 'content':199 'convers':92 'crypto api payments' 'data':11,30,61,65,258 'data-analytics' 'describ':117 'detail':210 'doc':183 'document':178,211,251 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,214,221,237 'estim':86 'exampl':207 'exchang':81 'exchange-rates' 'expect':228 'export':66 'extrem':180 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':256 'gas':85 'gas-estimates' 'generat':93 'geocod':90 'geocoding' 'header':158 'homepag':241 'i.e':137 'infrastructur':88 'input':226 'insight':67 'instant':176 'key':147 'learn':70 'limit':172 'list':113,238 'live':125 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'mean':144 'metric':63 'micropayment api' 'minimum':174 'multi':245 'multi-purpos':244 'need':151 'network':108 'no-api-key' 'offer':48 'openapi':203 'page':188 'paid':102 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':157,162 'per':3,22,55,100 'platform':6,25,46,168 'post':231 'premium':119 'price':79,97,185 'prompt':195 'protocol':143 'purpos':246 'qualiti':259 'quot':84 'rate':82,171 'readm':187 'render':190 'report':64 'request':4,23,56,101,128,232 'request/response':206 'resourc':166 'return':123,223 'schema':204,253 'sentiment':71 'sentiment-analysis' 'serverless api marketplace' 'sign':161 'spars':181 'specif':110,222 'substant':198 'suggest':242 'suit':248 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':217 'unit':134 'usdc':104,136 'usdc-base' 'util':15,34,89 'valid':91 'validation' 'verifi':262 'via':9,28 'wallet':194 'web3':78 'without':250 'x':156 'x-payment':155 'x402':10,29,43,142 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"1383e48f-09ff-493c-abac-adc1c5f52cdc","listingId":"0221e8fc-863d-4a88-94b5-e6e3b1ac31c0","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/orders/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:49.167Z"}],"sources":[{"listingId":"0221e8fc-863d-4a88-94b5-e6e3b1ac31c0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:49.167Z","lastSeenAt":"2026-04-23T00:31:03.906Z"}],"details":{"listingId":"0221e8fc-863d-4a88-94b5-e6e3b1ac31c0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/77 \\\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 are priced at $0.02 per request with no minimums, no API keys, and no rate limits","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":"The x402 challenge for /api/v1/orders/77 requests up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/77"},{"claim":"Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/orders/77"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments","Integrating pay-per-use data analytics into agent workflows"],"bestFor":["Agents or developers who want instant API access without registration or API keys","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Crypto-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-request costs add up (no bulk discounts documented)","Users who need detailed API documentation, schemas, or SLAs before integrating","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:35:19.819Z"},"updatedAt":"2026-04-23T00:31:03.906Z"}}