{"id":"f4d98ca2-f20c-4fe4-aa7a-11405607b644","shortId":"g3L2RT","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"lowpaymentfee.com is a pay-per-call API platform that uses the x402 protocol to gate access to a variety of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Each request costs $0.02 in USDC on the Base network, with no API keys, rate limits, or upfront commitments required. Payment is handled inline via the X-PAYMENT header per the x402 specification.\n\nThe specific endpoint `/api/v1/benefits/25` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge confirms it is live, accepting exact-scheme payments of up to 20,000 base units of USDC (0x8335…) on Base — which equals $0.02 given USDC's 6 decimals. The timeout window is 300 seconds. The endpoint is discoverable and accepts POST requests.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The endpoint's actual functionality behind the \"Premium API Access\" label is unclear from the available material; it may be a generic or placeholder offering among the site's broader catalog of endpoints.","tags":[],"capabilities":["x402-payment","per-call-billing","usdc-base","json-response","no-api-key","post-method"],"categories":["api-gateway","misc"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API access","lowpaymentfee","Base network API","402 payment API"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no content","The exact functionality of /api/v1/benefits/25 ('Premium API Access') is undocumented and unclear","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/25","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on what this endpoint actually returns, no request/response schemas, and no examples. The 'Premium API Access' label is generic and uninformative. The docs pages are empty beyond a wallet-connect 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'0.02':10,28,73,143 '000':133 '0x8335':138 '20':132 '300':153 '402 payment API' '6':147 'Base network API' 'USDC API access' 'accept':124,160 'access':6,24,53,113,210 'actual':204 'ai':62 'among':226 'analyt':61 'api':5,16,23,34,44,82,112,173,209 'application/json':116 'avail':216 'base':8,26,78,134,140 'behind':206 'broader':230 'call':43 'catalog':231 'challeng':119 'commit':88 'confirm':120 'connect':181 'content':187 'cost':72 'data':60 'decim':148 'discover':158 'doc':171 'document':163,196 'endpoint':58,106,156,202,233 'equal':142 'exact':126 'exact-schem':125 'exampl':200 'extrem':168 'financ':65 'function':205 'gate':3,21,52 'generic':222 'given':144 'handl':92 'header':99 'infrastructur':68 'inlin':93 'json-response' 'key':17,35,83 'label':211 'learn':64 'limit':85 'list':109 'live':123 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':63 'materi':217 'may':219 'micropayment API' 'network':79 'no-api-key' 'offer':225 'openapi':191 'page':176 'pay':9,27,41 'pay-per-cal':40 'pay-per-call API' 'payment':90,98,128 'per':11,29,42,100 'per-call-billing' 'placehold':224 'platform':45 'post':161 'post-method' 'premium':4,22,111,208 'price':172 'prompt':183 'protocol':50 'rate':84 'readm':175 'render':178 'request':12,30,71,162 'request/response':194 'requir':18,36,89 'return':115 'schema':195 'scheme':127 'second':154 'site':166,228 'span':59 'spec':192 'specif':103,105 'thin':169 'timeout':150 'unclear':213 'unit':135 'upfront':87 'usag':199 'usdc':14,32,75,137,145 'usdc-base' 'use':47 'util':69 'varieti':56 'via':94 'wallet':182 'web3':66 'window':151 'x':97 'x-payment':96 'x402':2,20,49,102,118 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"d4a31fb7-2c3c-4b79-934c-0a0ee9eb1a76","listingId":"f4d98ca2-f20c-4fe4-aa7a-11405607b644","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:40.171Z"}],"sources":[{"listingId":"f4d98ca2-f20c-4fe4-aa7a-11405607b644","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:40.171Z","lastSeenAt":"2026-04-22T05:31:54.050Z"}],"details":{"listingId":"f4d98ca2-f20c-4fe4-aa7a-11405607b644","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/25 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/25"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/25"},{"claim":"Site advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls from an AI agent using x402 payment flow","Exploring x402 protocol integration with USDC on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads requiring SLAs and support","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.14Z"},"updatedAt":"2026-04-22T05:31:54.050Z"}}