{"id":"e598b7b7-4e9a-4d17-baad-584bbe35b2bb","shortId":"C4RH62","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/policies/5` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required.\n\nThe broader platform advertises four categories of APIs: 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/request pricing. However, the `/api/v1/policies/5` endpoint's purpose is not clearly documented — it may be a policy lookup or a meta-endpoint; the crawled material only labels it \"Premium API Access\" without further detail.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (402 challenge captured), but what it actually returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/policies/5 ('Premium API Access') is not explained anywhere in the crawled material","Cannot verify what data or functionality is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/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/policies/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/policies/5 is undocumented. This is effectively a stub 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'limit':110 'list':69,156 'live':241 'lookup':179 'low payment fee' 'lowpaymentfee.com':35 'machin':130 'made':99 'marketplac':42 'materi':187,236 'may':175 'meta':183 'meta-endpoint':182 'metric':124 'micropay':55 'micropayment api' 'network':62 'offer':8,25 'openapi':222 'page':207 'pay-per-request api' 'payment':97,251 'per':53,95 'per-request':52 'per-request-micropayment' 'platform':5,22,116 'polici':178 'premium':71,191 'price':140,163 'prompt':214 'protocol':40 'purpos':169 'quot':145 'rate':109,143 'render':209 'report':125 'request':54,79 'request/response':225 'requir':113 'return':75,249 'schema':226 'scheme':104 'sentiment':132 'sentiment-analysis' 'settl':56 'share':158 'spars':200 'spec':223 'specif':64 'subscript':112 'summar':135 'text':134 'text-summarization' 'token':144 'unit':85 'unknown':253 'usag':230 'usdc':58,87,91 'usdc api access' 'usdc-base' 'util':13,30,150 'utility-apis' 'valid':152 'varieti':48 'via':100 'wallet':213 'web3':139 'without':194 'x402':2,19,39,102 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"8fd36a7e-83af-426a-8bad-ee76d02091f7","listingId":"e598b7b7-4e9a-4d17-baad-584bbe35b2bb","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/policies/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":"2026-04-18T18:51:57.138Z"}],"sources":[{"listingId":"e598b7b7-4e9a-4d17-baad-584bbe35b2bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:57.138Z","lastSeenAt":"2026-04-22T21:31:13.142Z"}],"details":{"listingId":"e598b7b7-4e9a-4d17-baad-584bbe35b2bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/policies/5"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for AI inference (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates via micropayments","Accessing utility services like geocoding and data validation on a pay-as-you-go basis","Exporting data or generating analytics reports without subscription commitments"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring low-volume, on-demand API calls without rate limits","Crypto-native workflows that can settle USDC payments on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.628Z"},"updatedAt":"2026-04-22T21:31:13.142Z"}}