{"id":"7fd8cd2d-4441-4467-8fd8-9286d7bf7133","shortId":"6Tf8ff","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, 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 the Base network.\n\nThe specific endpoint `/api/v1/charges/12` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header.\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 documentation, and no examples of what this particular endpoint returns. The site's landing page lists many endpoints but provides no detail on input parameters or response formats. Prospective users should be aware that the actual functionality behind `/api/v1/charges/12` is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","premium-api"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content.","No OpenAPI or schema definition found for any endpoint.","The specific functionality of /api/v1/charges/12 ('Premium API Access') is not explained; it does not match any of the named endpoints on the landing page.","No request or response examples are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/12","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/12","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schemas, and no examples. The actual functionality behind this specific endpoint path (/api/v1/charges/12) is not described anywhere in the crawled 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'/api/v1/charges/12':103,231 '/docs':168 '/pricing':169 '/readme':172 '0.02':12,28,90,136 '000':125 '0x8335':130 '20':124 '2913':131 '402 payment endpoint' '6':134 'Base network API' 'USDC micropayment API' 'accept':110 'access':7,23,40,108 'actual':228 'ai/ml':61 'analysi':64 'analyt':60 'api':6,22,39,57,107,149 'attach':157 'avail':235 'awar':225 'base':9,25,98,126,133 'behind':230 'broad':50 'call':4,20,138 'caller':155 'catalog':51 'challeng':115 'classif':66 'confirm':116 'connect':178 'content':184 'convers':83 'crypto-paid API' 'data':59 'decim':135 'detail':214 'document':163,193 'embed':67 'endpoint':34,86,102,201,210 'estim':77 'exact':145 'exampl':196 'exchang':72 'extrem':165 'feed':71 'financ':68 'format':220 'function':229 'gas':76 'generat':84 'geocod':81 'header':162 'host':48 'infer':62 'infrastructur':79 'input':216 'key':150 'label':105 'land':206 'limit':153 'list':208 'live':119 'lowpaymentfee' 'lowpaymentfee.com':36 'made':141 'mani':209 'materi':236 'maximum':122 'network':99 'no-api-key' 'openapi':188 'page':173,207 'paramet':217 'particular':200 'pay':2,18,54 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':53 'payment':44,139,161 'per':3,13,19,29,55,91,137 'post':111 'post-endpoint' 'premium':5,21,38,106 'premium-api' 'price':70,88 'prompt':180 'prospect':221 'protocol':45 'provid':37,212 'quot':75 'rate':73,152 'render':175 'request':14,30,56,92,112,120 'request/response':191 'requir':154 'respons':219 'return':202 'schema':192 'scheme':146 'sentiment':63 'settl':93 'simpli':156 'site':47,204 'span':58 'spars':166 'spec':189 'specif':101 'summar':65 'token':74 'unclear':233 'unit':127 'usdc':16,32,95,129 'usdc-base' 'user':222 'util':80 'valid':82 'via':10,26,41,142 'wallet':179 'web3':69 'x':160 'x-payment':159 'x402':11,27,43,114,144 'x402 API' 'x402-payment'","prices":[{"id":"43d17547-2591-447d-b06e-75a5854a828f","listingId":"7fd8cd2d-4441-4467-8fd8-9286d7bf7133","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:09.107Z"}],"sources":[{"listingId":"7fd8cd2d-4441-4467-8fd8-9286d7bf7133","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:09.107Z","lastSeenAt":"2026-04-24T06:32:01.123Z"}],"details":{"listingId":"7fd8cd2d-4441-4467-8fd8-9286d7bf7133","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/12 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/12"},{"claim":"All listed 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 site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/charges/12"}],"useCases":["Agent-driven API consumption with automatic per-call USDC payments","Accessing premium data or services without API key registration","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.262Z"},"updatedAt":"2026-04-24T06:32:01.123Z"}}