{"id":"2f0d2a1d-e41f-4936-b58d-f1e4380e9922","shortId":"crmr2A","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific endpoint `/api/v1/transactions/301` accepts POST requests and charges 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equals $0.02 per request. Payment is handled inline via the X-PAYMENT header with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform offers a suite of pay-per-call APIs spanning 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 priced uniformly at $0.02 per request and settle in USDC on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. The specific functionality of the `/api/v1/transactions/301` endpoint beyond its title \"Premium API Access\" is unclear. There is no OpenAPI schema, no request/response examples, and no description of what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","no-rate-limit","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment protocol"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/transactions/301 ('Premium API Access') is undefined","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/301","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/301","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 there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of this endpoint is entirely unclear beyond its generic title. The docs pages are 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'/request':16,34 '0.02':15,33,75,149 '000':60 '20':59 '402 payment protocol' '6':67 'Base network API' 'USDC micropayment API' 'accept':54 'access':7,25,44,193 'ai':117 'analysi':121 'analyt':111 'api':6,24,43,90,108,164,192 'base':9,27,61,71,157 'base-network' 'beyond':188 'broader':97 'call':4,22,107 'charg':58 'classif':124 'coin':66 'connect':173 'convers':141 'crypto-paid API' 'data':110,114,209 'decim':68 'descript':206 'detail':180 'doc':163 'document':158 'embed':125 'endpoint':38,52,144,187,214 'equal':74 'estim':135 'exampl':203 'exchang':130 'export':115 'extrem':160 'feed':129 'financ':126 'function':183 'gas':134 'generat':142 'geocod':139 'handl':80 'header':87 'infrastructur':137 'inlin':81 'insight':116 'key':91 'learn':119 'limit':94 'lowpaymentfee' 'lowpaymentfee.com':40,98 'machin':118 'metric':112 'network':10,28,72 'no-api-key' 'no-rate-limit' 'offer':100 'openapi':199 'page':168 'particular':213 'pay':2,20,105 'pay-per-cal':1,19,104 'pay-per-call' 'pay-per-request API' 'payment':48,78,86 'per':3,21,76,106,150 'platform':99 'post':55 'post-method' 'premium':5,23,42,191 'price':128,146,165 'prompt':175 'protocol':13,31,49 'provid':41 'quot':133 'rate':93,131 'readm':167 'render':170 'report':113 'request':56,77,151 'request/response':202 'requir':95 'return':215 'schema':200 'sentiment':120 'servic':211 'settl':153 'span':109 'spars':161 'specif':51,182 'suit':102 'summar':123 'technic':179 'text':122 'titl':190 'token':132 'unclear':195 'uniform':147 'unit':62 'usd':65 'usdc':18,36,64,155 'usdc-settlement' 'util':138 'valid':140 'via':11,29,45,82 'wallet':174 'web3':127 'x':85 'x-payment':84 'x402':12,30,47 'x402 API' 'x402-payment'","prices":[{"id":"cc657839-67ab-4390-835a-1cd6c90868e5","listingId":"2f0d2a1d-e41f-4936-b58d-f1e4380e9922","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/301","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:56.793Z"}],"sources":[{"listingId":"2f0d2a1d-e41f-4936-b58d-f1e4380e9922","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/301","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:56.793Z","lastSeenAt":"2026-04-22T13:31:49.918Z"}],"details":{"listingId":"2f0d2a1d-e41f-4936-b58d-f1e4380e9922","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/301 \\\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":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/301"},{"claim":"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/301"}],"useCases":["Accessing premium API services without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Programmatic agent-to-service payments without subscriptions"],"bestFor":["Developers wanting instant API access without signup","Agents needing pay-per-call endpoints with no rate limits","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume use cases where per-call pricing may be expensive at scale","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.337Z"},"updatedAt":"2026-04-22T13:31:49.918Z"}}