{"id":"911a8ed3-f60a-4187-9cb2-421986280c0a","shortId":"LLbXDZ","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/generate/resource/5` is listed under \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. The broader platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation beyond the landing page is extremely thin: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual behavior and output of `/api/v1/generate/resource/5` (and the other endpoints) cannot be verified without making a paid request.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-api","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee","402 payment api"],"warnings":["No OpenAPI specification or request/response schema available","All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content","The actual functionality of /api/v1/generate/resource/5 ('Premium API Access') is undocumented — it is unclear what it generates","The broader platform lists many endpoint categories (AI, finance, data, etc.) but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/5","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/generate/resource/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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, and no examples. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The actual functionality of this specific 'resource/5' endpoint is 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'/api/v1/generate/resource/5':104,226 '/docs':186 '/pricing':187 '/readme':190 '/request':18,36 '0.02':17,35,68,129,174 '000':119 '0x8335':124 '20':118 '402 payment api' '6':133 'accept':137 'access':110 'actual':221 'advertis':114 'ai':12,30,55 'ai-inference' 'also':146 'analysi':151 'analyt':54 'api':5,23,43,81,109 'application/json':142 'attach':92 'avail':216 'base':8,26,76,120,126 'base usdc api' 'behavior':222 'beyond':178 'broad':48 'broader':144 'call':4,22 'caller':90 'cannot':231 'challeng':113 'classif':154 'classification' 'collect':49 'commit':89 'connect':196 'content':202 'convers':166 'conversion' 'cover':10,28 'crawl':219 'crypto-quotes' 'data':11,29,53,168 'data-analytics' 'decim':134 'document':177,211 'embed':155 'embeddings' 'enabl':42 'endpoint':51,64,102,136,148,230 'equal':128 'estim':163 'everi':63 'exampl':215 'exchang':158 'export':169 'expos':147 'extrem':183 'feed':157 'financ':13,31,58 'finance-data' 'gas':162 'gas-estimates' 'geocod':164 'geocoding' 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'x402-payment'","prices":[{"id":"d194fc78-f280-4795-b51b-c3f7eba3ebb5","listingId":"911a8ed3-f60a-4187-9cb2-421986280c0a","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/generate/resource/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:52.900Z"}],"sources":[{"listingId":"911a8ed3-f60a-4187-9cb2-421986280c0a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:52.900Z","lastSeenAt":"2026-04-23T17:31:10.196Z"}],"details":{"listingId":"911a8ed3-f60a-4187-9cb2-421986280c0a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/5 \\\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":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/5"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/5"}],"useCases":["Agent-driven data retrieval with per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates via x402","Geocoding and data validation as utility microservices"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-throughput batch workloads where per-call pricing is inefficient","Teams requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.457Z"},"updatedAt":"2026-04-23T17:31:10.196Z"}}