{"id":"c0fb0db4-fc80-4a0c-a4f4-f83de1b2435e","shortId":"DsHA6h","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/invoices/17` is labeled \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe site lists four endpoint 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 listed endpoints share the same $0.02 per-request pricing.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The invoices/17 endpoint specifically lacks any description beyond its title, so its exact functionality is unclear. Callers should expect to experiment or contact the provider for details on request and response formats.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","premium API access"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/invoices/17 has no description of what it returns or what input it expects","No examples of request or response payloads found in crawl material","The endpoint path 'invoices/17' suggests a specific resource rather than a general-purpose API — purpose is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/17","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/invoices/17 is unexplained. This is effectively a stub 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'/api/v1/invoices/17':69 '/docs':168 '/pricing':170 '/readme':172 '/request':19,38 '0.02':18,37,79,158 '000':83 '20':82 '6':89 'Base network API' 'USDC API' 'access':74,102 'advertis':93 'ai':12,31,126 'ai-inference' 'analysi':130 'analyt':120 'api':5,24,45,73,95 'attach':105 'avail':199 'base':8,27,63,84 'base-network' 'beyond':210 'broad':50 'call':4,23,81 'caller':103,219 'catalog':51 'categori':118 'classif':133 'classification' 'connect':178 'contact':225 'convers':150 'cost':76 'cover':10,29 'crawl':202 'data':11,30,119,123 'data-analytics' 'decim':90 'descript':209 'detail':185,229 'document':163,194 'embed':134 'embeddings' 'enabl':44 'endpoint':16,35,57,67,117,154,205 'estim':144 'exact':215 'exampl':198 'exchang':139 'expect':221 'experi':223 'export':124 'extrem':165 'feed':138 'financ':13,32,135 'finance-data' 'format':234 'four':116 'function':216 'gas':143 'generat':151 'geocod':148 'geocoding' 'header':109 'infrastructur':146 'insight':125 'instant':101 'invoices/17':204 'key':96 'label':71 'lack':207 'learn':128 'limit':99 'list':115,153 'low payment fee' 'lowpaymentfee.com':39 'machin':127 'metric':121 'micropayment API' 'network':64 'offer':48 'openapi':189 'page':173 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':108 'per':3,22,55,80,160 'per-request':159 'platform':6,25,46,92 'premium':72 'premium API access' 'price':137,162 'prompt':180 'provid':227 'quot':142 'rate':98,140 'render':175 'report':122 'request':56,112,161,231 'request/response':192 'respons':233 'schema':193 'sentiment':129 'sentiment-analysis' 'settl':58 'share':155 'simpli':104 'site':114 'spars':166 'spec':190 'specif':66,206 'summar':132 'technic':184 'text':131 'text-summarization' 'titl':212 'token':141 'unclear':218 'unit':85 'usag':197 'usdc':9,28,60,87 'usdc-settlement' 'util':15,34,147 'utility-apis' 'valid':149 'wallet':179 'web3':136 'x402':43,107 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d790c260-aa84-4839-a850-93704b8d4efe","listingId":"c0fb0db4-fc80-4a0c-a4f4-f83de1b2435e","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:42.080Z"}],"sources":[{"listingId":"c0fb0db4-fc80-4a0c-a4f4-f83de1b2435e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:42.080Z","lastSeenAt":"2026-04-22T21:30:30.435Z"}],"details":{"listingId":"c0fb0db4-fc80-4a0c-a4f4-f83de1b2435e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/17 \\\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":"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/17"},{"claim":"All listed 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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/17"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with no subscription commitment","Using utility services like geocoding, validation, and conversion via micropayments"],"bestFor":["Agents or developers who want keyless, pay-as-you-go API access","Low-volume or bursty workloads where subscriptions are wasteful","Crypto-native applications already operating on the Base network"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime (no documentation on reliability)","Users who need detailed API documentation or schema contracts before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.022Z"},"updatedAt":"2026-04-22T21:30:30.435Z"}}