{"id":"a959763b-6c49-4cbf-8cbc-946213533cd2","shortId":"RYFnjU","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/61` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four categories: 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\nThis particular endpoint (`/api/v1/transfers/61`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that label. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no further content. Without additional documentation or example responses, the exact data returned by this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment API"],"warnings":["Endpoint functionality is undocumented — 'Premium API Access' label gives no detail on what data or service is returned.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no usable content.","No OpenAPI spec, no example responses, and no input schema beyond 'POST with JSON'.","The specific endpoint path '/api/v1/transfers/61' does not appear in the site's listed API catalog, raising questions about its purpose."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/61","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/61","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 402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no example request/response, and the docs/pricing/README pages are all empty (just 'Connect wallet'). The actual functionality behind 'Premium API Access' at /api/v1/transfers/61 is undocumented, making this effectively a stub 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,164 'across':112 'actual':167 'addit':195 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,163,179 'attach':95 'base':8,23,51,73 'beyond':172 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67 'classif':129 'connect':187 'content':193 'convers':146 'crawl':176 'data':115,119,202 'doc':177 'document':171,196 'embed':130 'endpoint':55,111,149,158,206 'estim':140 'exact':201 'exampl':198 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':168 'gas':139 'generat':147 'geocod':144 'header':100 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'key':86 'label':161,174 'learn':124 'limit':89 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'page':182 'particular':157 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'premium':60,162 'price':133,151,178 'prompt':189 'proof':106 'protocol':44 'quot':138 'rate':88,136 'readm':181 'remain':207 'report':118 'request':37,68,155 'respons':199 'return':64,184,203 'sentiment':125 'simpli':94 'specif':54 'summar':128 'text':127 'token':137 'unclear':208 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':188 'web3':132 'without':194 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"5bb3c428-f9db-4147-90ed-59d18c16c708","listingId":"a959763b-6c49-4cbf-8cbc-946213533cd2","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:52.995Z"}],"sources":[{"listingId":"a959763b-6c49-4cbf-8cbc-946213533cd2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:52.995Z","lastSeenAt":"2026-04-22T23:02:17.675Z"}],"details":{"listingId":"a959763b-6c49-4cbf-8cbc-946213533cd2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/61 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/transfers/61"},{"claim":"The 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":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages returned only 'Connect wallet' with no documentation content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium data or services without API key registration","Agent-driven workflows that need instant, keyless API access with crypto micropayments","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402-compatible wallets and agent frameworks on Base","Low-cost micropayment experimentation"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.845Z"},"updatedAt":"2026-04-22T23:02:17.675Z"}}