{"id":"ac9d28c1-bf47-4dec-aac0-9ea86778c4d1","shortId":"5cwABP","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site advertises a broad suite of APIs spanning data & analytics, 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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/resource/13` is listed as \"Premium API Access\" and returns a valid x402 402 challenge. The challenge specifies payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 examples of what `/api/resource/13` actually returns. The site's landing page lists many API paths but does not clarify what this particular resource ID maps to. Treat this as a low-documentation endpoint where the actual payload and behavior must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["general","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered experimentally","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no usable content","The meaning of '/api/resource/13' is not documented; it is unclear what this specific resource returns","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/resource/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/resource/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no examples. The specific resource '/api/resource/13' is not explained anywhere. This is effectively a stub 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'/api/resource/13':110,203 '/docs':172 '/pricing':174 '/readme':176 '/request':13,28 '0.02':12,27,86,143 '000':132 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '0x8335':137 '20':131 '2913':138 '402':122 '6':147 'Base network API' 'USDC micropayment API' 'accept':161 'access':7,22,38,116 'actual':204,236 'address':153 'advertis':46 'ai':55 'analysi':59 'analyt':54 'api':6,21,37,51,98,115,213 'application/json':166 'base':9,24,94,133,140 'behavior':239 'broad':48 'call':4,19 'challeng':123,125 'clarifi':218 'classif':62 'commit':105 'connect':182 'content':188 'convers':79 'data':53 'decim':148 'discov':242 'document':167,197,232 'embed':63 'endpoint':32,82,109,160,233 'equal':142 'estim':73 'exact':157 'exampl':200 'exchang':68 'experiment':243 'extrem':169 'feed':67 'financ':64 'gas':72 'generat':80 'geocod':77 'given':144 'id':223 'infrastructur':75 'json-response' 'key':99 'land':209 'learn':57 'limit':102 'list':112,211 'low':231 'low payment fee API' 'low-document':230 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':56 'mani':212 'map':224 'must':240 'network':95 'no-api-key' 'openapi':192 'page':177,210 'particular':221 'path':214 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':89 'payload':237 'payment':42,127,149 'per':3,18,87 'post':162 'post-method' 'premium':5,20,36,114 'price':66,84 'prompt':184 'protocol':43 'provid':35 'quot':71 'rate':69,101 'render':179 'request':88,163 'request/response':195 'requir':106 'resourc':222 'return':118,165,205 'schema':196 'scheme':158 'sent':151 'sentiment':58 'site':45,207 'span':52 'spars':170 'spec':193 'specif':108 'specifi':126 'suit':49 'summar':61 'text':60 'token':70 'treat':226 'unit':134 'usdc':15,30,91,136,145 'usdc-base' 'use':155 'util':76 'valid':78,120 'via':10,25,39 'wallet':183 'web3':65 'x402':11,26,41,121 'x402 premium API' 'x402-payment'","prices":[{"id":"982c9809-4f38-4a57-b81c-6c3367b69d50","listingId":"ac9d28c1-bf47-4dec-aac0-9ea86778c4d1","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/resource/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":"2026-04-18T18:38:12.820Z"}],"sources":[{"listingId":"ac9d28c1-bf47-4dec-aac0-9ea86778c4d1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:12.820Z","lastSeenAt":"2026-04-22T11:31:10.363Z"}],"details":{"listingId":"ac9d28c1-bf47-4dec-aac0-9ea86778c4d1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/13 \\\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":"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":"x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/resource/13"},{"claim":"Site lists APIs for data & analytics, AI & ML, finance & Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or AI endpoints without API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto micropayments"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents with Base USDC wallets needing on-demand endpoints","Prototyping integrations without committing to subscription plans"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up and bulk pricing is preferred","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.58Z"},"updatedAt":"2026-04-22T11:31:10.363Z"}}