{"id":"30a06987-20ab-4e8b-aa5b-1c9244c8fe8a","shortId":"8Md4dD","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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/transfers/16` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an x402 payment header to each request.\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 priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/transfers/16` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or example payloads. Without further documentation it is unclear what data or service this particular endpoint returns when a valid payment is provided.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","The specific functionality of /api/v1/transfers/16 ('Premium API Access') is completely undocumented.","No OpenAPI schema, no example request/response payloads, and no output schema beyond the basic HTTP POST input declaration.","The broader platform lists many API categories (AI, finance, analytics, etc.) but none are documented with schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/16","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/16","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 402 challenge, but there is essentially no documentation about what the endpoint actually does or returns. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The label 'Premium API Access' is generic and uninformative. Without an output schema, example responses, or any description of the service, this is effectively a stub 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'/request':13,28 '0.02':12,27,80,147 '000':74 '20':73 '402':66 '402 payment API' 'Base network API' 'USDC API' 'accept':46 'access':62,164 'addit':181 'advertis':104 'ai':116 'analysi':120 'analyt':110 'api':5,20,38,61,84,106,163 'attach':93 'base':8,23,51,75 'behind':154 'beyond':159 'broader':102 'call':4,19,82 'caller':91 'categori':107 'challeng':67 'classif':123 'connect':176 'convers':140 'crawl':166 'data':109,113,195 'doc':167 'document':158,183,190 'embed':124 'endpoint':55,143,200 'estim':134 'exampl':186 'exchang':129 'export':114 'feed':128 'financ':125 'function':153 'gas':133 'generat':141 'geocod':138 'header':97 'howev':150 'http-post' 'i.e':79 'includ':108 'infrastructur':136 'insight':115 'key':85 'label':161 'learn':118 'limit':88 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':117 'metric':111 'micropayment API' 'multipl':105 'network':9,24,52 'no-api-key' 'page':171 'particular':199 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':187 'payment':48,69,96,205 'per':3,18,36,81,148 'platform':6,21,39,103 'premium':60,162 'price':127,145,168 'prompt':178 'protocol':44 'provid':207 'quot':132 'rate':87,130 'readm':170 'report':112 'request':37,100,149 'requir':68,90 'return':64,173,201 'schema':184 'sentiment':119 'servic':197 'simpli':92 'specif':54,152 'summar':122 'technic':182 'text':121 'token':131 'unclear':193 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':137 'valid':139,204 'via':10,25 'wallet':177 'web3':126 'without':188 'x402':11,26,43,95 'x402 API' 'x402-payment'","prices":[{"id":"02342769-4586-4b65-a2fd-69ed093e821b","listingId":"30a06987-20ab-4e8b-aa5b-1c9244c8fe8a","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:30.081Z"}],"sources":[{"listingId":"30a06987-20ab-4e8b-aa5b-1c9244c8fe8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:30.081Z","lastSeenAt":"2026-04-23T03:32:01.615Z"}],"details":{"listingId":"30a06987-20ab-4e8b-aa5b-1c9244c8fe8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/16 \\\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 up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/16"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/16"},{"claim":"Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without traditional API key signup","Agent-driven workflows that need instant, keyless API access paid in USDC","Testing x402 protocol integrations on Base network"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access","Users who prefer crypto micropayments over subscription billing","x402 protocol integrators looking for low-cost endpoints on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without access to USDC on the Base network","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.901Z"},"updatedAt":"2026-04-23T03:32:01.615Z"}}