{"id":"13ae0710-2600-4fe4-bf5f-aac9c00fc336","shortId":"9QFRPm","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 hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each endpoint costs $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific resource probed (/api/v1/generate/resource/132) is labeled \"Premium API Access\" and returns a valid x402 challenge (version 1, scheme \"exact\") requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts HTTP POST and returns application/json. The maximum timeout for payment settlement is 300 seconds.\n\nDocumentation is extremely sparse — 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 examples of what this particular resource returns. The site's landing page lists many endpoints but provides no detail on input parameters or output formats. As a result, while the endpoint is confirmed live and the pricing is clear, the actual functionality behind resource/132 is unknown beyond its generic label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","http-post"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/generate/resource/132 is unknown — 'Premium API Access' is a generic label","No request parameters or response format documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/132","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/132","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 x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality of resource/132 is completely opaque beyond its generic 'Premium API Access' 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'/api/v1/generate/resource/132':111 '/docs':173 '/pricing':174 '/readme':177 '/request':13,28 '0.02':12,27,86,136 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '1':124 '20':130 '300':166 '6':141 'Base network API' 'USDC micropayment API' 'accept':153 'access':7,22,38,116 'actual':241 'address':149 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,98,115 'application/json':158 'base':9,24,94,132,144 'base-network' 'behind':243 'beyond':247 'broad':48 'call':4,19 'catalog':49 'challeng':122 'classif':64 'clear':239 'commit':105 'confirm':233 'connect':183 'content':189 'convers':81 'cost':85 'crypto-paid API' 'data':57 'decim':142 'detail':219 'document':168,198 'embed':65 'endpoint':32,84,152,215,231 'estim':75 'exact':126 'exampl':201 'exchang':70 'extrem':170 'feed':69 'financ':66 'format':225 'function':242 'gas':74 'generat':82 'generic':249 'geocod':79 'host':46 'http':154 'http-post' 'infer':60 'infrastructur':77 'input':221 'json-response' 'key':99 'label':113,250 'land':211 'limit':102 'list':213 'live':234 'lowpaymentfee' 'lowpaymentfee.com':34 'mani':214 'maximum':160 'network':95 'no-api-key' 'openapi':193 'output':224 'page':178,212 'paramet':222 'particular':205 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,145,163 'per':3,18,53,87 'post':155 'premium':5,20,36,114 'premium API access' 'price':68,237 'probe':110 'prompt':185 'protocol':43 'provid':35,217 'quot':73 'rate':71,101 'render':180 'request':54,88,127 'request/response':196 'requir':106 'resourc':109,206 'resource/132':244 'result':228 'return':118,157,207 'schema':197 'scheme':125 'second':167 'sent':147 'sentiment':61 'settl':89 'settlement':164 'sinc':138 'site':45,209 'span':56 'spars':171 'spec':194 'specif':108 'summar':63 'timeout':161 'token':72 'unit':133 'unknown':246 'usd':137 'usdc':15,30,91,135,139 'usdc-settlement' 'use':140 'util':78 'valid':80,120 'version':123 'via':10,25,39 'wallet':184 'web3':67 'x402':11,26,41,121 'x402 API' 'x402-payment'","prices":[{"id":"83477258-c558-4bcb-815f-2f82881e0502","listingId":"13ae0710-2600-4fe4-bf5f-aac9c00fc336","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/132","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:44.720Z"}],"sources":[{"listingId":"13ae0710-2600-4fe4-bf5f-aac9c00fc336","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/132","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:44.720Z","lastSeenAt":"2026-04-22T19:30:52.785Z"}],"details":{"listingId":"13ae0710-2600-4fe4-bf5f-aac9c00fc336","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/132 \\\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 valid x402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/132"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/132"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic consumption of paid endpoints without subscription commitments"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.853Z"},"updatedAt":"2026-04-22T19:30:52.785Z"}}