{"id":"5aaa09a1-fbee-458b-aa70-22591d9bf148","shortId":"gLZMCc","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, 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, settled in USDC on Base with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/charges/76` is labeled \"Premium API Access\" in the x402 challenge. Its maxAmountRequired is 20000 base units of USDC (6 decimals), which equals $0.02. Payment is made via the x402 exact scheme by including an X-PAYMENT header with a signed USDC transfer to the payTo address on Base. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation is extremely sparse — 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, and no examples available. It is unclear what specific data or functionality the `/api/v1/charges/76` endpoint returns, as the site's landing page lists many different API categories but does not map charge IDs to specific services. The endpoint is confirmed live (402 challenge captured).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-gateway","pay-per-call"],"synonyms":["lowpaymentfee","x402 api","micropayment api","usdc api access","pay per call api","base network api","crypto api payment"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/charges/76 ('Premium API Access') is ambiguous — it is unclear which of the many advertised services it maps to","No examples or sample responses available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/76","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/charges/76","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 effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific function of /api/v1/charges/76 is unclear. Pricing is clear ($0.02 USDC on 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'/api/v1/charges/76':113,213 '/docs':175 '/pricing':176 '/readme':179 '0.02':10,24,91,135 '20000':126 '402':241 '6':131 'accept':164 'access':6,20,36,118 'address':159 'ai':60 'analysi':64 'analyt':59 'api':5,19,35,56,101,117,225 'application/json':169 'avail':203 'base':8,22,43,98,127,161 'base network api' 'base-network' 'behind':37 'broad':49 'call':55 'captur':243 'catalog':50 'categori':226 'challeng':122,242 'charg':231 'classif':67 'commit':109 'confirm':239 'connect':185 'content':191 'convers':84 'crypto api payment' 'data':58,209 'decim':132 'differ':224 'document':170 'embed':68 'endpoint':30,87,112,163,214,237 'equal':134 'estim':78 'exact':142 'exampl':202 'exchang':73 'extrem':172 'feed':72 'financ':69 'function':211 'gas':77 'gate':3,17 'generat':85 'geocod':82 'header':150 'host':47 'http':165 'http-post' 'id':232 'includ':145 'infrastructur':80 'json-response' 'key':102 'label':115 'land':220 'learn':62 'limit':105 'list':222 'live':240 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'made':138 'mani':223 'map':230 'maxamountrequir':124 'micropayment api' 'minimum':108 'network':44 'no-api-key' 'openapi':195 'page':180,221 'pay':9,23,53 'pay per call api' 'pay-per-cal':52 'pay-per-request' 'payment':136,149 'payto':158 'paywal':40 'per':11,25,54,92 'post':166 'premium':4,18,34,116 'price':71,89 'prompt':187 'provid':33 'quot':76 'rate':74,104 'render':182 'request':12,26,93 'request/response':198 'return':168,215 'schema':199 'scheme':143 'sentiment':63 'servic':235 'settl':94 'sign':153 'site':46,218 'span':57 'spars':173 'spec':196 'specif':111,208,234 'summar':66 'text':65 'token':75 'transfer':155 'unclear':206 'unit':128 'usdc':14,28,96,130,154 'usdc api access' 'usdc-settlement' 'util':81 'valid':83 'via':139 'wallet':186 'web3':70 'x':148 'x-payment':147 'x402':2,16,39,121,141 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"65963a3e-7300-4537-ba1c-24ca78910c09","listingId":"5aaa09a1-fbee-458b-aa70-22591d9bf148","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/charges/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:35.052Z"}],"sources":[{"listingId":"5aaa09a1-fbee-458b-aa70-22591d9bf148","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:35.052Z","lastSeenAt":"2026-04-23T22:02:13.236Z"}],"details":{"listingId":"5aaa09a1-fbee-458b-aa70-22591d9bf148","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/76 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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 site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/76"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to paid API services without traditional API key registration","Agent-driven workflows that need to pay per call using USDC on Base","Accessing data, AI, finance, or utility endpoints with minimal friction"],"bestFor":["Developers or agents who want keyless, pay-per-request API access","Use cases requiring low-cost micropayments ($0.02) settled on-chain","Scenarios where no subscription or rate-limit constraints are desired"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request on-chain settlement overhead matters","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.106Z"},"updatedAt":"2026-04-23T22:02:13.236Z"}}