{"id":"778baf7a-c3d0-4d01-8f81-f49a4202dcf0","shortId":"B5NLpK","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"lowpaymentfee.com is a pay-per-call API platform that gates its endpoints behind the x402 protocol, settling payments in USDC on the Base network. The specific endpoint `/api/v1/benefits/7` is labeled \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per request. 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 several categories of endpoints — 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 priced at $0.02 per request. However, this listing covers only the `/api/v1/benefits/7` endpoint, whose specific functionality beyond the generic \"Premium API Access\" label is not documented.\n\nThe endpoint is live and returns a well-formed x402 version 1 challenge. Documentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The actual data returned by this endpoint after successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","premium-api-access"],"categories":["api-gateway","crypto"],"synonyms":["low payment fee","x402 API","USDC pay-per-call","Base network API","micropayment API","402 payment required","premium access endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no content.","The actual response payload after successful payment is completely unknown.","The specific purpose of /api/v1/benefits/7 ('Premium API Access') is not explained anywhere — it is unclear what data or service it provides.","No OpenAPI spec or request/response schema is published."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/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/benefits/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 and returns a valid x402 challenge, but there is zero documentation on what data it actually returns after payment. No OpenAPI spec, no request schema, no response examples, and the docs pages are empty. The listing is essentially a stub with only the payment parameters 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'0.02':10,29,88,156 '000':82 '1':192 '20':81 '402 payment required' 'Base network API' 'USDC pay-per-call' 'access':6,25,72,175 'account':95 'actual':234 'advertis':115 'ai':127 'analysi':131 'analyt':121 'api':5,24,46,71,92,174,204 'attach':100 'avail':232 'base':8,27,62,83 'base-network' 'behind':52 'beyond':170 'broader':113 'call':45 'caller':98 'categori':117 'challeng':77,193 'classif':134 'connect':212 'convers':151 'cover':162 'data':120,124,235 'detail':219 'doc':202 'document':179,194 'embed':135 'endpoint':51,66,119,166,181,239 'estim':145 'exampl':230 'exchang':140 'export':125 'extrem':199 'feed':139 'financ':136 'form':189 'function':169 'gas':144 'gate':3,22,49 'generat':152 'generic':172 'geocod':149 'header':105 'howev':159 'i.e':87 'infrastructur':147 'insight':126 'key':16,35,93 'label':69,176 'learn':129 'limit':19,38 'list':161 'live':183 'low payment fee' 'lowpaymentfee.com':39 'machin':128 'metric':122 'micropayment API' 'network':63 'no-api-key' 'openapi':223 'page':207 'pay':9,28,43 'pay-per-cal':42 'pay-per-request' 'payload':231 'payment':57,104,110,242 'per':11,30,44,89,157 'platform':47,114 'premium':4,23,70,173 'premium access endpoint' 'premium-api-access' 'price':138,154,203 'prompt':214 'proof':111 'protocol':55 'quot':143 'rate':18,37,141 'readm':206 'render':209 'report':123 'request':12,31,78,90,158 'request/response':226 'requir':97 'return':74,185,236 'schema':227 'sentiment':130 'settl':56 'sever':116 'simpli':99 'site':197 'spec':224 'specif':65,168 'success':241 'summar':133 'technic':218 'text':132 'thin':200 'token':142 'unit':84 'unknown':244 'usdc':14,33,59,86 'usdc-settlement' 'util':148 'valid':108,150 'version':191 'wallet':213 'web3':137 'well':188 'well-form':187 'whose':167 'x':103 'x-payment':102 'x402':2,21,54,76,109,190 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"2f1c6439-2fc6-41f5-9733-a31dd1839286","listingId":"778baf7a-c3d0-4d01-8f81-f49a4202dcf0","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/benefits/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":"2026-04-18T19:59:48.677Z"}],"sources":[{"listingId":"778baf7a-c3d0-4d01-8f81-f49a4202dcf0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:48.677Z","lastSeenAt":"2026-04-22T05:31:54.422Z"}],"details":{"listingId":"778baf7a-c3d0-4d01-8f81-f49a4202dcf0","quickStartSnippet":"# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/benefits/7\n# Returns 402 with x402 payment challenge in JSON body.\n# 2. Construct an X-PAYMENT header with a valid x402 proof paying\n#    up to 0.02 USDC to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3\n#    on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\ncurl -X POST https://lowpaymentfee.com/api/v1/benefits/7 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/benefits/7","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"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/benefits/7"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/7"}],"useCases":["Agents that need to call premium APIs without pre-registering for API keys","Programmatic access to gated content or services via on-chain micropayments","Demonstrating x402 protocol integration for pay-per-request workflows"],"bestFor":["Developers experimenting with x402 protocol payments","AI agents with USDC wallets on Base that need keyless API access","Low-volume, on-demand API consumption without subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up without bulk discounts","Anyone who needs to know exactly what data the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.791Z"},"updatedAt":"2026-04-22T05:31:54.422Z"}}