{"id":"c8253dec-2c1b-460c-ba86-b74abda6ad34","shortId":"jW5yea","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/payments/386` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 and settle via USDC on Base.\n\nHowever, the specific endpoint probed (`/api/v1/payments/386`) does not clearly map to any of the documented API categories on the landing page. Its description is simply \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or example responses. This makes it difficult to determine the actual functionality of this particular endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 api","pay per call api","usdc api access","base network api","micropayment api","lowpaymentfee","402 payment api"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no technical content.","The endpoint path /api/v1/payments/386 does not match any of the documented API routes on the landing page; its actual functionality is unclear.","No OpenAPI schema, example requests, or example responses are provided.","No information about what data or service is returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/386","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/payments/386","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the endpoint path '/api/v1/payments/386' does not correspond to any documented API on the landing page. The actual functionality behind 'Premium API Access' is 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'/request':13,30,153 '0.02':12,29,69,152 '000':73 '20':72 '402 payment api' '6':79 'accept':50 'access':66,189 'account':84 'actual':230 'addit':216 'advertis':89,107 'ai':119 'analysi':123 'analyt':113 'api':5,15,22,32,42,65,82,109,177,188,205 'attach':92 'base':8,25,55,74,161 'base network api' 'broader':105 'call':4,21,71 'caller':90 'categori':110,178 'classif':126 'clear':170 'connect':211 'convers':143 'cost':68 'data':112,116,196 'decim':80 'descript':184 'determin':228 'difficult':226 'doc':202 'document':176,193,218 'embed':127 'endpoint':59,146,165,235 'estim':137 'exampl':221 'exchang':132 'export':117 'feed':131 'financ':128 'function':198,231 'gas':136 'generat':144 'geocod':141 'header':97 'howev':162 'http-post' 'includ':111 'infrastructur':139 'insight':118 'key':16,33,83 'land':181 'learn':121 'limit':87 'list':62,148 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'make':224 'map':171 'metric':114 'micropayment api' 'multipl':108 'network':56 'no-api-key' 'page':182,206 'particular':234 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,96,102 'per':3,20,40,70 'platform':6,23,43,106 'point':155 'premium':64,187 'price':130,154,203 'probe':166 'prompt':213 'proof':103 'protocol':48 'quot':135 'rate':86,133 'render':208 'report':115 'request':41 'requir':17,34 'respons':222 'return':200 'schema':219 'sentiment':122 'settl':157 'simpli':91,186 'specif':58,164 'summar':125 'technic':217 'text':124 'token':134 'unit':75 'usdc':9,26,51,77,159 'usdc api access' 'usdc-base' 'use':45 'util':140 'valid':100,142 'via':10,27,158 'wallet':212 'web3':129 'x':95 'x-payment':94 'x402':11,28,47,101 'x402 api' 'x402-payment'","prices":[{"id":"a5741a9f-f388-48b9-b04e-06818d004e65","listingId":"c8253dec-2c1b-460c-ba86-b74abda6ad34","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/payments/386","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:43.466Z"}],"sources":[{"listingId":"c8253dec-2c1b-460c-ba86-b74abda6ad34","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/386","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:43.466Z","lastSeenAt":"2026-04-23T20:02:38.722Z"}],"details":{"listingId":"c8253dec-2c1b-460c-ba86-b74abda6ad34","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Attach a valid X-PAYMENT header (x402 v1, USDC on Base) to access.\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/386 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/386"},{"claim":"All listed APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/386"}],"useCases":["Accessing premium API endpoints with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to data, AI, finance, or utility services"],"bestFor":["Developers who want zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.21Z"},"updatedAt":"2026-04-23T20:02:38.722Z"}}