{"id":"ae485e3e-150c-481a-963b-12729c359696","shortId":"Qq7SFJ","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 a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint `/api/v1/claims/67` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The price per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request.\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 endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required — payment is handled entirely through the x402 payment header.\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 description of what the `/api/v1/claims/67` endpoint specifically returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality this particular claims endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-method","json-response"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","claims api"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/claims/67 ('Premium API Access') is undefined — unclear what data it returns","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/67","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/claims/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet' with no content. There is no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/claims/67 endpoint actually returns. The listing is essentially a 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'/request':17,34 '0.02':16,33,94,144 '000':85 '20':84 '402':216 '6':90 'accept':69 'access':67 'advertis':101 'ai':10,27,113 'analysi':117 'analyt':107 'api':4,21,40,66,105,149,174 'base':7,24,56,86 'base network api' 'base-network' 'behind':48 'broader':99 'call':82 'categori':103 'challeng':217 'claim':230 'claims api' 'classif':120 'commit':157 'confirm':211 'connect':183 'content':189 'convers':137 'data':9,26,106,110,225 'decim':91 'descript':200 'doc':173 'document':168,220 'embed':121 'endpoint':14,31,47,60,140,205,209,231 'entir':162 'equal':93 'estim':131 'exact':77 'exampl':197 'exchang':126 'export':111 'extrem':170 'feed':125 'financ':11,28,122 'four':102 'function':227 'gas':130 'gate':3,20,43 'generat':138 'geocod':135 'handl':161 'header':167 'infrastructur':133 'insight':112 'json-response' 'key':150 'learn':115 'limit':153 'list':63 'live':212 'low payment fee' 'lowpaymentfee.com':35 'machin':114 'marketplac':41 'metric':108 'micropay':53 'micropayment api' 'minimum':156 'network':57 'no-api-key' 'offer':8,25 'openapi':193 'page':178 'particular':229 'pay-per-request api' 'payment':73,159,166 'per':50,81,96,145 'per-request':49 'per-request-billing' 'platform':5,22,100 'post':70 'post-method' 'premium':65 'price':80,124,142,175 'prompt':185 'proper':215 'protocol':39 'provid':232 'quot':129 'rate':127,152 'readm':177 'render':180 'report':109 'request':51,71,97,146 'request/response':196 'requir':158 'return':207,213 'schema':194 'scheme':78 'sentiment':116 'spars':171 'specif':59,206 'substant':188 'summar':119 'text':118 'token':128 'unclear':223 'unit':87 'usd':95 'usdc':52,89 'usdc api access' 'usdc-micropayment' 'util':13,30,134 'valid':136 'varieti':45 'via':74 'wallet':184 'web3':123 'without':219 'x402':2,19,38,76,165 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"1a5d2c84-0d13-489e-ab25-7904294cbf52","listingId":"ae485e3e-150c-481a-963b-12729c359696","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/claims/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:56.762Z"}],"sources":[{"listingId":"ae485e3e-150c-481a-963b-12729c359696","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:56.762Z","lastSeenAt":"2026-04-22T23:01:31.187Z"}],"details":{"listingId":"ae485e3e-150c-481a-963b-12729c359696","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/67 \\\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 x402Version 1, exact scheme, on Base network, with maxAmountRequired of 20000 USDC base units","source_url":"https://lowpaymentfee.com/api/v1/claims/67"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/67"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.049Z"},"updatedAt":"2026-04-22T23:01:31.187Z"}}