{"id":"f09c11ec-6fb6-442d-aee4-d2222b20a745","shortId":"sC4MSd","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/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 Base with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/57` is labeled \"Premium API Access\" in the x402 challenge. Its maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, 6 decimals), which equals $0.02. The endpoint accepts POST requests and returns application/json. The x402 challenge uses the \"exact\" scheme with a 300-second timeout.\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 functionality the `/api/v1/charges/57` endpoint provides beyond the generic \"Premium API Access\" label, as the numbered charge path does not correspond to any of the named API routes listed on the homepage.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages (/docs, /pricing, /README) contain no useful content","The endpoint path /api/v1/charges/57 does not match any named API route on the homepage — its specific functionality is unknown","No examples of request payloads or response formats are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/57","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/57","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, no request/response schema, and no examples. The specific purpose of /api/v1/charges/57 is unclear. The docs, pricing, and README pages are all blank beyond a wallet connect 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'/api/v1/charges/57':111,197 '/docs':161 '/pricing':162 '/readme':165 '0.02':10,24,89,135 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':130 '20000':124 '300':153 '6':131 'Base network API' 'USDC API access' 'accept':138 'access':6,20,36,116,205 'ai/ml':60 'analysi':63 'analyt':59 'api':5,19,35,56,99,115,204,220 'application/json':143 'asset':129 'avail':189 'base':8,22,43,96,125 'base-network' 'behind':37 'beyond':200 'broad':49 'call':55 'catalog':50 'challeng':120,146 'charg':210 'classif':65 'commit':106 'connect':171 'content':177 'convers':82 'correspond':214 'crypto-paid API' 'data':58 'decim':132 'document':156 'embed':66 'endpoint':30,85,110,137,198 'equal':134 'estim':76 'exact':149 'exampl':188 'exchang':71 'extrem':158 'feed':70 'financ':67 'function':195 'gas':75 'gate':3,17 'generat':83 'generic':202 'geocod':80 'homepag':225 'host':47 'infer':61 'infrastructur':78 'json-response' 'key':100 'label':113,206 'limit':103 'list':222 'lowpaymentfee' 'lowpaymentfee.com':32 'maxamountrequir':122 'micropayment API' 'name':219 'network':44 'no-api-key' 'number':209 'openapi':181 'page':166 'path':211 'pay':9,23,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'paywal':40 'per':11,25,54,90 'post':139 'post-method' 'premium':4,18,34,114,203 'price':69,87 'prompt':173 'provid':33,199 'quot':74 'rate':72,102 'render':168 'request':12,26,91,140 'request/response':184 'requir':107 'return':142 'rout':221 'schema':185 'scheme':150 'second':154 'sentiment':62 'settl':92 'site':46 'span':57 'spars':159 'spec':182 'specif':109,194 'summar':64 'timeout':155 'token':73 'unclear':192 'unit':126 'usdc':14,28,94,128 'usdc-settlement' 'use':147 'util':79 'valid':81 'wallet':172 'web3':68 'x402':2,16,39,119,145 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c1c5ec69-6888-4c86-9378-d26e053def6f","listingId":"f09c11ec-6fb6-442d-aee4-d2222b20a745","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:32.024Z"}],"sources":[{"listingId":"f09c11ec-6fb6-442d-aee4-d2222b20a745","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:32.024Z","lastSeenAt":"2026-04-23T23:32:10.679Z"}],"details":{"listingId":"f09c11ec-6fb6-442d-aee4-d2222b20a745","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/57 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/57"},{"claim":"Site offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to data, AI, finance, or utility endpoints without subscriptions"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.305Z"},"updatedAt":"2026-04-23T23:32:10.679Z"}}