{"id":"853fcd39-3bd8-4f5e-8407-7acedf076368","shortId":"RKYUBN","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/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, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/84` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment to the payTo address. No API keys, rate limits, or upfront commitments are required — access is instant once payment is included.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no further technical detail. As a result, the exact input/output schemas for this particular endpoint and the other listed APIs are unknown. The endpoint is confirmed live (402 challenge captured), but the lack of documentation limits confidence in what the endpoint actually returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["No documentation available — all doc pages return only a 'Connect wallet' prompt with no technical content.","The exact purpose and response format of /api/v1/charges/84 ('Premium API Access') is unspecified; it is unclear what data or service it provides.","No OpenAPI spec, no input schema, and no output schema are available.","The site lists many endpoints but none have documented request/response formats."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/84","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no input/output schema, and no examples of what the endpoint actually returns. The docs, API, pricing, and README pages all render only a wallet-connect prompt. The listing is effectively a stub with confirmed 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'/request':13,28 '0.02':12,27,70,115 '000':102 '0x8335':107 '20':101 '2913':108 '402':225 '6':111 'Base network API' 'USDC micropayment API' 'access':7,22,38,90,149 'actual':239 'address':138 'advertis':159 'ai/ml':59 'analysi':163 'analyt':58 'api':6,21,37,55,89,140,187,217 'attach':125 'base':9,24,79,103,110 'base-network' 'broad':48 'broader':157 'call':4,19 'caller':124 'captur':227 'catalog':49 'challeng':96,226 'classif':166 'commit':146 'confid':234 'confirm':223 'connect':194 'convers':178 'crawl':183 'crypto-paid API' 'data':57,63 'decim':112 'detail':201 'doc':186 'document':184,232 'embed':167 'endpoint':32,83,160,212,221,238 'equal':114 'estim':175 'exact':122,206 'exchang':170 'feed':169 'financ':61 'gas':174 'generat':180 'geocod':176 'header':130 'host':46 'howev':181 'includ':155 'infer':60 'infrastructur':65 'input/output':207 'instant':151 'json-response' 'key':141 'lack':230 'limit':143,233 'list':86,216 'live':224 'lowpaymentfee' 'lowpaymentfee.com':34 'made':118 'maxamountrequir':99 'network':80 'no-api-key' 'page':185 'particular':211 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,116,129,134,153 'payto':137 'per':3,18,53,71 'platform':158 'premium':5,20,36,88 'premium API' 'price':68,168,188 'prompt':196 'protocol':43 'provid':35 'quot':173 'rate':142,171 'readm':189 'request':54,72 'requir':148 'result':204 'return':92,191,240 'schema':208 'scheme':123 'sentiment':162 'settl':74 'sign':133 'site':45 'span':56 'specif':82 'summar':165 'technic':200 'text':164 'token':172 'unit':104 'unknown':219 'upfront':145 'usdc':15,30,76,106 'usdc-settlement' 'util':66 'valid':94,177 'via':10,25,39,119 'wallet':195 'web3':62 'x':128 'x-payment':127 'x402':11,26,41,95,121 'x402 API' 'x402-payment'","prices":[{"id":"b02be984-c7c6-4a97-b0f7-1d98d691bfb0","listingId":"853fcd39-3bd8-4f5e-8407-7acedf076368","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:30.825Z"}],"sources":[{"listingId":"853fcd39-3bd8-4f5e-8407-7acedf076368","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:30.825Z","lastSeenAt":"2026-04-23T01:01:24.723Z"}],"details":{"listingId":"853fcd39-3bd8-4f5e-8407-7acedf076368","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/84 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/84"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/84"},{"claim":"All APIs 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 lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, api, pricing, README) return only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or utility APIs without signup or API keys","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto payment"],"bestFor":["Developers or agents who want frictionless pay-per-use API access","Users already holding USDC on Base who want to avoid traditional billing","Automated agents that need to programmatically purchase API calls via x402"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without USDC on the Base network","High-volume consumers who need bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.327Z"},"updatedAt":"2026-04-23T01:01:24.723Z"}}