{"id":"be7bb21d-6caa-478a-9423-c073db9bbf43","shortId":"Q6LDV3","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/benefits/44` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 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 model.\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 schema, no request/response examples, and no description of what the `/api/v1/benefits/44` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond its name.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or output schema provided; the actual response payload of /api/v1/benefits/44 is unknown","The purpose and data returned by 'Premium API Access' is entirely unclear from available materials","Cannot verify what functionality any of the advertised endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/44","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/benefits/44","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 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' actually returns. The docs pages are all empty wallet-connect stubs. This is effectively a stub 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'/request':165 '0.02':10,24,85,164 '000':80 '0x8335':70 '20':79 '2913':71 '402':216 '6':90 'Base network API' 'USDC micropayment API' 'accept':61 'access':6,20,59,230 'across':122 'actual':206 'advertis':120 'ai':132 'analysi':136 'analyt':126 'api':5,19,38,58,93,175,229 'attach':104 'base':8,22,48,73,81 'base-network' 'beyond':232 'broader':117 'call':37 'caller':102 'categori':124 'challeng':217 'classif':139 'collect':32 'commit':99 'confirm':211 'connect':183 'content':189 'contract':69 'convers':156 'cost':77 'crypto-paid endpoint' 'data':125,129,225 'decim':91 'descript':200 'doc':173 'document':168,220 'embed':140 'endpoint':39,52,121,160,205,209 'equal':84 'estim':150 'exampl':197 'exchang':145 'export':130 'extrem':170 'feed':144 'financ':141 'four':123 'function':227 'gas':149 'gate':3,17,40 'generat':157 'geocod':154 'header':109 'infrastructur':152 'insight':131 'json-response' 'key':94 'label':56 'learn':134 'limit':96 'list':159 'live':212 'lowpaymentfee' 'lowpaymentfee.com':29,118 'machin':133 'maximum':76 'metric':127 'model':167 'name':234 'network':49 'no-api-key' 'offer':30 'openapi':193 'page':178 'pay':9,23,35 'pay-per-cal':34 'pay-per-call API' 'pay-per-request' 'payment':44,64,108,114 'per':11,25,36,86 'platform':119 'post':62 'post-endpoint' 'premium':4,18,57,228 'premium API access' 'price':143,166,174 'prompt':185 'proof':115 'proper':215 'protocol':45 'provid':231 'quot':148 'rate':95,146 'readm':177 'render':180 'report':128 'request':12,26,63,87 'request/response':196 'requir':101 'return':207,213 'schema':194 'sentiment':135 'settl':66 'share':161 'simpli':103 'spars':171 'specif':51 'summar':138 'text':137 'token':147 'unclear':223 'unit':82 'upfront':98 'usdc':14,28,68,88 'usdc-settlement' 'use':89 'util':153 'valid':112,155 'wallet':184 'web3':142 'without':219 'x':107 'x-payment':106 'x402':2,16,43,113 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c6664d98-3457-40e2-a021-6419e4e36793","listingId":"be7bb21d-6caa-478a-9423-c073db9bbf43","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/benefits/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:37.708Z"}],"sources":[{"listingId":"be7bb21d-6caa-478a-9423-c073db9bbf43","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:37.708Z","lastSeenAt":"2026-04-22T07:32:04.491Z"}],"details":{"listingId":"be7bb21d-6caa-478a-9423-c073db9bbf43","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/44 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/44"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/44"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint without needing API keys or subscriptions","Agent-driven workflows that pay per request using USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents that need keyless, pay-as-you-go API access","Low-cost per-request API consumption settled on-chain"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.344Z"},"updatedAt":"2026-04-22T07:32:04.491Z"}}