{"id":"80050e3f-c624-44d2-8556-470fee1fd9e7","shortId":"dfztKD","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/151` 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. No API keys or accounts are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/151` endpoint actually returns. The endpoint is live and responds with a well-formed x402 challenge, but without documentation it is unclear what data or functionality this specific transfer endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","crypto"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","402 payment API"],"warnings":["No documentation available — all doc/API/pricing/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/transfers/151 ('Premium API Access') is unexplained","No request or response examples available anywhere in crawled content","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/151","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/151","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 documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/transfers/151 endpoint actually does. The listing is effectively a 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'/request':13,28 '0.02':12,27,78,148 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62 'account':85 'actual':191 'advertis':105 'ai':117 'analysi':121 'analyt':111 'api':5,20,38,61,82,107,158 'attach':90 'base':8,23,51,73 'broader':103 'call':4,19,80 'caller':88 'categori':108 'challeng':67,205 'classif':124 'connect':167 'convers':141 'data':110,114,213 'descript':185 'detail':174 'doc':157 'document':152,208 'embed':125 'endpoint':55,144,190,194,219 'estim':135 'exampl':182 'exchang':130 'export':115 'extrem':154 'feed':129 'financ':126 'form':203 'function':215 'gas':134 'generat':142 'geocod':139 'header':95 'howev':151 'i.e':77 'includ':109 'infrastructur':137 'insight':116 'json-response' 'key':83 'learn':119 'list':58 'live':196 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':118 'metric':112 'micropayment API' 'multipl':106 'network':9,24,52 'no-api-key' 'openapi':178 'page':162 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,94,100 'per':3,18,36,79,149 'platform':6,21,39,104 'post-method' 'premium':60 'price':128,146,159 'prompt':169 'proof':101 'protocol':44 'provid':220 'quot':133 'rate':131 'readm':161 'render':164 'report':113 'request':37,68,150 'request/response':181 'requir':87 'respond':198 'return':64,192 'schema':179 'sentiment':120 'simpli':89 'spars':155 'specif':54,217 'summar':123 'technic':173 'text':122 'token':132 'transfer':218 'unclear':211 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':138 'valid':98,140 'via':10,25 'wallet':168 'web3':127 'well':202 'well-form':201 'without':207 'x':93 'x-payment':92 'x402':11,26,43,99,204 'x402 API' 'x402-payment'","prices":[{"id":"28ca2264-d533-42f3-88c2-ca8e6961356f","listingId":"80050e3f-c624-44d2-8556-470fee1fd9e7","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/151","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:39.794Z"}],"sources":[{"listingId":"80050e3f-c624-44d2-8556-470fee1fd9e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/151","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:39.794Z","lastSeenAt":"2026-04-23T02:01:53.267Z"}],"details":{"listingId":"80050e3f-c624-44d2-8556-470fee1fd9e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/151 \\\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":"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/151"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/151"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto payment"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users comfortable paying in USDC on the Base L2 network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone who requires fiat payment rails (credit card, bank transfer)","Production workloads that need SLA guarantees or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.453Z"},"updatedAt":"2026-04-23T02:01:53.267Z"}}