{"id":"592332ae-e887-43b2-a2da-dcbdeaa3dc0a","shortId":"P5ungB","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/261` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. The platform also advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and returns application/json, but without further documentation it is unclear what request body this specific endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base-network","no-api-key","json-response","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The specific purpose of /api/v1/transactions/261 ('Premium API Access') is unclear and may be a generic or placeholder endpoint","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/261","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/transactions/261","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint does beyond the generic label 'Premium API Access'. The endpoint's actual functionality cannot be determined from available 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'/request':13,30 '0.02':12,29,122,160 '000':117 '20':116 '6':127 'Base network API' 'USDC API' 'accept':212 'access':110 'advertis':134 'ai/ml':53 'also':133 'analysi':138 'analyt':52 'api':5,15,22,32,41,81,109,169 'application/json':217 'attach':92 'base':8,25,71,118 'bodi':227 'broad':46 'call':4,21,130 'caller':90 'challeng':202 'classif':141 'commit':89 'confirm':209 'connect':178 'content':184 'convers':153 'crypto-paid API' 'data':51,56 'decim':128 'detail':195 'doc':168 'document':163,196,221 'embed':142 'enabl':40 'endpoint':49,61,102,135,199,211,230 'estim':150 'exampl':192 'exchang':145 'expect':231 'extrem':165 'feed':144 'finance/web3':55 'form':208 'gas':149 'generat':155 'geocod':151 'header':96 'http-post' 'infer':54 'infrastructur':58 'json-response' 'key':16,33,82 'limit':85 'list':106 'live':204 'lowpaymentfee' 'lowpaymentfee.com':35 'maximum':114 'micropayment API' 'minimum':88 'network':9,26,72 'no-api-key' 'offer':44 'openapi':188 'page':173 'pay':2,19,64 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':63 'payment':95 'per':3,20,65,129 'platform':6,23,42,132 'point':162 'post':213 'premium':108 'price':143,161,170 'prompt':180 'protocol':77 'quot':148 'rate':84,146 'readm':172 'render':175 'request':66,99,214,226 'request/response':191 'requir':17,34,112 'respons':234 'return':216,236 'schema':189 'sentiment':137 'set':47 'settl':73 'simpli':91 'sinc':124 'span':50 'spars':166 'specif':101,229 'substant':183 'summar':140 'text':139 'token':147 'unclear':224 'unit':119 'usd':123 'usdc':68,121,125 'usdc-base-network' 'use':67,126 'util':59 'valid':152 'via':10,27,74 'wallet':179 'well':207 'well-form':206 'without':219 'x402':11,28,39,76,94,201 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"235e4a3c-f185-4303-bed2-f485d81a1392","listingId":"592332ae-e887-43b2-a2da-dcbdeaa3dc0a","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/transactions/261","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:36.611Z"}],"sources":[{"listingId":"592332ae-e887-43b2-a2da-dcbdeaa3dc0a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/261","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:36.611Z","lastSeenAt":"2026-04-23T16:07:44.667Z"}],"details":{"listingId":"592332ae-e887-43b2-a2da-dcbdeaa3dc0a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/261 \\\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 402 challenge requiring USDC payment of 20000 base units (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/261"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/261"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls from autonomous agents using x402","Paying for API access with USDC on Base L2"],"bestFor":["Developers wanting zero-friction, keyless 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 OpenAPI specs before integrating","High-volume callers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.715Z"},"updatedAt":"2026-04-23T16:07:44.667Z"}}