{"id":"93a3521a-6966-4cc0-8f8b-f11d791ecc85","shortId":"Gx2Z7b","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/resource/47`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: 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, this listing covers only `/api/resource/47`, whose specific functionality is not documented beyond the generic \"Premium API Access\" label.\n\nThe endpoint is live and returns a well-formed x402 challenge (version 1, scheme \"exact\"). Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key"],"categories":["general","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific functionality of /api/resource/47 is unknown — 'Premium API Access' is a generic label with no further documentation.","All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec or request/response schema is available; callers cannot know what to send or expect back.","The broader site lists many endpoint paths (e.g. /api/v1/analytics/metrics, /api/v2/ai/sentiment) but this endpoint (/api/resource/47) does not match any of them, raising questions about what it actually does."],"endpointUrl":"https://lowpaymentfee.com/api/resource/47","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/47","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 challenge, but the actual functionality behind '/api/resource/47' is completely undocumented. No OpenAPI spec, no request/response schemas, no examples, and all documentation pages render only 'Connect wallet'. The listing is effectively a stub with confirmed liveness and 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'/request':13,28,163 '0.02':12,27,80,162 '000':84 '0x8335':71 '1':197 '20':83 '2913':72 '6':88 'Base network API' 'USDC micropayment API' 'accept':62 'access':7,22,42,60,182 'across':120 'addit':223 'advertis':118 'ai':130 'analysi':134 'analyt':124 'api':6,21,40,59,91,181,209 'attach':102 'avail':238 'base':9,24,50,74,85 'beyond':177 'broader':115 'call':4,19 'caller':100 'categori':122 'challeng':195 'classif':137 'collect':34 'commit':97 'connect':218 'contract':70 'convers':154 'cost':78 'cover':168 'crawl':241 'crypto-paid API' 'data':123,127 'decim':89 'detail':225 'doc':208 'document':176,200 'embed':138 'endpoint':41,54,119,158,185 'estim':148 'exact':199 'exampl':237 'exchang':143 'export':128 'extrem':205 'feed':142 'financ':139 'form':193 'four':121 'function':173 'gas':147 'generat':155 'generic':179 'geocod':152 'header':107 'host':32 'howev':165 'infrastructur':150 'insight':129 'key':92 'label':57,183 'learn':132 'limit':94 'list':157,167 'live':187 'lowpaymentfee' 'lowpaymentfee.com':31,116 'machin':131 'materi':242 'maximum':77 'metric':125 'network':51 'no-api-key' 'openapi':229 'page':213 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,65,106,112 'per':3,18,38,81 'platform':117 'post':63 'post-endpoint' 'premium':5,20,58,180 'premium API access' 'price':141,164,210 'prompt':220 'proof':113 'protocol':47 'quot':146 'rate':93,144 'readm':212 'render':215 'report':126 'request':39,64,82 'request/response':232 'requir':99 'return':189 'schema':233 'scheme':198 'sentiment':133 'settl':67 'share':159 'simpli':101 'site':203 'spars':206 'spec':230 'specif':53,172 'summar':136 'technic':224 'text':135 'token':145 'unit':86 'upfront':96 'usag':236 'usdc':15,30,69 'usdc-base' 'util':151 'valid':110,153 'version':196 'via':10,25,43 'wallet':219 'web3':140 'well':192 'well-form':191 'whose':171 'x':105 'x-payment':104 'x402':11,26,45,111,194 'x402 API' 'x402-payment'","prices":[{"id":"4cf6e10c-76ce-4957-bb3e-b57bcb7ba784","listingId":"93a3521a-6966-4cc0-8f8b-f11d791ecc85","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:55.590Z"}],"sources":[{"listingId":"93a3521a-6966-4cc0-8f8b-f11d791ecc85","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:55.590Z","lastSeenAt":"2026-04-22T13:30:28.870Z"}],"details":{"listingId":"93a3521a-6966-4cc0-8f8b-f11d791ecc85","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/47 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 challenge with version 1, scheme 'exact', on Base network","source_url":"https://lowpaymentfee.com/api/resource/47"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/resource/47"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API calls settled on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents that need keyless pay-per-use API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.344Z"},"updatedAt":"2026-04-22T13:30:28.870Z"}}