{"id":"b05e21c1-3ccf-4209-80ce-b3378cfcae9b","shortId":"HPtu3g","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 path `/api/v1/transfers/7` is one of many endpoints offered by this provider, which hosts a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities.\n\nThe endpoint accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. Payment settles on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). The provider advertises no API keys, no rate limits, and instant access — you pay per request with no minimums or commitments.\n\nThe broader platform lists endpoints for metrics, reports, data export, insights, 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/request price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. The specific behavior and response format of `/api/v1/transfers/7` is not documented beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","per-request-billing","base-network","usdc-settlement","post-method","no-api-key","no-rate-limit"],"categories":["infrastructure","finance"],"synonyms":["pay-per-call API","x402 endpoint","micropayment API","USDC API payment","Base network API","lowpaymentfee","transfers API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The specific purpose and response format of /api/v1/transfers/7 is unknown","No OpenAPI schema or example requests/responses provided by the provider","Cannot verify what data or service this specific endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/7","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/transfers/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request/response schemas, no OpenAPI spec, and the specific purpose of /api/v1/transfers/7 is undocumented beyond a generic label. All doc pages return only 'Connect wallet' with no technical 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'/request':16,34,185 '0.02':15,33,123,184 '000':118 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':111 '20':117 '6':127 'Base network API' 'USDC API payment' 'accept':86 'access':7,25,44,140,228 'advertis':131 'ai/ml':77 'analysi':162 'analyt':76 'api':6,24,43,73,133,195,227 'base':9,27,106,119 'base-network' 'behavior':214 'beyond':223 'broad':66 'broader':151 'call':4,22 'catalog':67 'classif':165 'commit':149 'connect':204 'contain':96 'contract':110 'convers':177 'cost':115 'data':75,80,158 'decim':128 'detail':211 'doc':194 'document':189,222 'embed':166 'endpoint':38,58,85,154 'equal':122 'estim':174 'exchang':169 'export':159 'extrem':191 'feed':168 'finance/web3':79 'format':217 'gas':173 'generat':179 'generic':225 'geocod':175 'header':95 'host':64 'howev':188 'infer':78 'infrastructur':82 'insight':160 'instant':139 'key':134 'label':229 'limit':137 'list':153 'lowpaymentfee' 'lowpaymentfee.com':40 'mani':57 'maximum':114 'metric':156 'micropayment API' 'minimum':147 'network':10,28,107 'no-api-key' 'no-rate-limit' 'offer':59 'one':55 'page':199 'path':52 'pay':2,20,70,142 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':69 'payment':48,94,100,102 'per':3,21,71,143 'per-request-billing' 'platform':152 'point':187 'post':87 'post-method' 'premium':5,23,42,226 'price':167,186,196 'prompt':206 'proof':101 'protocol':13,31,49 'provid':41,62,130 'quot':172 'rate':136,170 'readm':198 'render':201 'report':157 'request':72,88,144 'requir':90 'respons':216 'sentiment':161 'settl':103 'span':74 'spars':192 'specif':51,213 'summar':164 'technic':210 'text':163 'token':171 'transfers API' 'unit':120 'usd':124 'usdc':18,36,109,125 'usdc-settlement' 'use':108,126 'util':83 'valid':98,176 'via':11,29,45 'wallet':205 'x':93 'x-payment':92 'x402':12,30,47,99 'x402 endpoint' 'x402-payment'","prices":[{"id":"d6a861c0-7676-4ee7-b69c-eb01806072aa","listingId":"b05e21c1-3ccf-4209-80ce-b3378cfcae9b","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/transfers/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:03.873Z"}],"sources":[{"listingId":"b05e21c1-3ccf-4209-80ce-b3378cfcae9b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:03.873Z","lastSeenAt":"2026-04-23T17:32:24.163Z"}],"details":{"listingId":"b05e21c1-3ccf-4209-80ce-b3378cfcae9b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/7 \\\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 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/7"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/transfers/7"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without subscription or API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents needing keyless, pay-per-use API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume use cases where per-request pricing may be less economical than bulk plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.343Z"},"updatedAt":"2026-04-23T17:32:24.163Z"}}