{"id":"5ef9a93c-6f47-48e7-a237-f5e2e83dd1fc","shortId":"gvHW2Z","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 platform that gates a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint `/api/v1/claims/13` is listed as \"Premium API Access\" and accepts payment via the x402 exact scheme. The 402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.\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 listed at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, no minimums, and instant access — payment is the only authentication.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all returned 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. The specific functionality behind `/api/v1/claims/13` (\"Premium API Access\") is not described beyond its title, so it is unclear what data or service it returns. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-gateway","misc"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only 'Connect wallet'","No OpenAPI or schema definition for any endpoint","The specific function of /api/v1/claims/13 ('Premium API Access') is undocumented and unclear","No request body schema or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/13","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/claims/13' is entirely opaque. All secondary pages returned only 'Connect wallet' with no content. This is effectively a stub 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'/api/v1/claims/13':62,217 '/docs':181 '/pricing':183 '/readme':185 '/request':17,34,154 '0.02':16,33,97,153 '000':86 '0x8335':91 '20':85 '2913':92 '402':78,245 '6':103 'Base network API' 'USDC API' 'accept':70 'access':68,170,220 'advertis':108 'ai':10,27,120 'amount':83 'analysi':124 'analyt':114 'api':4,21,41,67,112,161,219 'authent':175 'base':7,24,57,87,94 'base-network' 'behind':49,216 'beyond':224 'broader':106 'categori':110 'challeng':79,246 'classif':127 'collect':46 'confirm':240 'connect':191 'content':197 'convers':144 'data':9,26,113,117,232 'decim':104 'describ':223 'detail':208 'document':176,209 'embed':128 'emphas':159 'endpoint':14,31,48,61,147,212,238 'equal':96 'estim':138 'exact':75 'exampl':205 'exchang':133 'export':118 'extrem':178 'feed':132 'financ':11,28,129 'four':109 'function':215 'gas':137 'gate':3,20,44 'generat':145 'geocod':142 'given':100 'indic':80 'infrastructur':140 'insight':119 'instant':169 'json-response' 'key':162 'learn':122 'limit':165 'list':64,149 'live':241 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':121 'max':82 'metric':115 'micropay':54 'micropayment API' 'minimum':167 'network':58 'no-api-key' 'offer':8,25 'openapi':201 'page':186 'pay-per-request API' 'payment':71,171 'per':51,98 'per-request':50 'per-request-billing' 'platform':5,22,42,107,158 'point':156 'premium':66,218 'price':131,155 'prompt':193 'protocol':40 'quot':136 'rate':134,164 'report':116 'request':52,99 'request/response':204 'respons':247 'return':188,236 'schema':202 'scheme':76 'sentiment':123 'servic':234 'spars':179 'specif':60,214 'substant':196 'summar':126 'text':125 'titl':226 'token':135 'unclear':230 'unit':88 'usdc':53,90,101 'usdc-micropayment' 'util':13,30,141 'valid':143,244 'via':72,242 'wallet':192 'web3':130 'x402':2,19,39,74 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"94550560-0b6d-4121-9790-61871d0f0010","listingId":"5ef9a93c-6f47-48e7-a237-f5e2e83dd1fc","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:51.271Z"}],"sources":[{"listingId":"5ef9a93c-6f47-48e7-a237-f5e2e83dd1fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:51.271Z","lastSeenAt":"2026-04-22T07:31:05.698Z"}],"details":{"listingId":"5ef9a93c-6f47-48e7-a237-f5e2e83dd1fc","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/claims/13 \\\n  -H 'Content-Type: application/json'\n# Returns 402 with x402 payment challenge. Use an x402 client library to\n# construct the payment header and complete the request.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The 402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/claims/13"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, no minimums, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Exploring x402-protocol payment flows for programmatic HTTP access"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need keyless, pay-per-call API access on Base","Projects wanting to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring well-documented, schema-defined APIs","Users who need free or fiat-only payment options","High-throughput use cases where $0.02/request adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.305Z"},"updatedAt":"2026-04-22T07:31:05.698Z"}}