{"id":"54ffd13f-3346-43dc-81e2-d34f63da9000","shortId":"9BPwar","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 specific resource at `/api/v1/charges/157` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled entirely through the x402 header mechanism — no API keys, accounts, or rate limits are required.\n\nThe broader lowpaymentfee.com platform advertises a suite of endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), 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 listed at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/charges/157`) is labeled only as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nThe endpoint is confirmed live: the probe received a proper HTTP 402 challenge with x402 version 1, specifying the exact payment scheme on Base. The payment timeout is 300 seconds. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no examples available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for this endpoint.","The specific functionality of /api/v1/charges/157 ('Premium API Access') is undefined; it is unclear what data or service it provides.","The broader platform lists many endpoint categories (AI, finance, data, infrastructure) but none map clearly to this specific charge ID."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/157","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","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 on what the endpoint actually returns, no OpenAPI spec, no request/response schema, and no examples. The docs pages are empty. The specific functionality behind 'Premium API Access' at /api/v1/charges/157 is entirely 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'/request':13,28 '0.02':12,27,70,145 '000':57 '0x8335':62 '1':190 '20':56 '2913':63 '300':202 '402':185 '6':75 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,162 'account':89 'across':104 'addit':227 'advertis':99 'ai':114 'analysi':118 'analyt':108 'api':6,21,37,87,161,213 'avail':241 'base':9,24,58,66,197 'broader':96 'call':4,19 'categori':106 'challeng':186 'charg':53 'classif':121 'confirm':177 'connect':222 'convers':138 'crypto-paid endpoint' 'data':107,111,169 'decim':76 'detail':229 'doc':212 'document':166,204 'embed':122 'endpoint':32,103,141,151,175 'entir':80 'equal':69 'estim':132 'exact':193 'exampl':240 'exchang':127 'export':112 'extrem':209 'feed':126 'financ':123 'four':105 'function':171 'gas':131 'generat':139 'geocod':136 'handl':79 'header':84 'howev':148 'http':184 'infrastructur':134 'insight':113 'key':88 'label':157 'learn':116 'limit':92 'list':143,153 'live':178 'lowpaymentfee' 'lowpaymentfee.com':34,97 'machin':115 'mechan':85 'metric':109 'network':67 'no-api-key' 'openapi':233 'page':217 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,77,194,199 'per':3,18,71,146 'platform':98 'post':50 'post-endpoint' 'premium':5,20,36,160 'premium API access' 'price':125,214 'probe':180 'prompt':224 'proper':183 'protocol':43 'provid':35 'quot':130 'rate':91,128 'readm':216 'receiv':181 'render':219 'report':110 'request':51,72,147 'request/response':236 'requir':94 'resourc':46 'return':173 'schema':237 'scheme':195 'second':203 'sentiment':117 'site':207 'spec':234 'specif':45,150 'specifi':191 'suit':101 'summar':120 'technic':228 'text':119 'thin':210 'timeout':200 'token':129 'unit':59 'usdc':15,30,61,73 'usdc-base' 'use':74 'util':135 'valid':137 'version':189 'via':10,25,39 'wallet':223 'web3':124 'x402':11,26,41,83,188 'x402 API' 'x402-payment'","prices":[{"id":"2ff98dcf-daa8-4aed-b970-aad6e3692a66","listingId":"54ffd13f-3346-43dc-81e2-d34f63da9000","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:28.411Z"}],"sources":[{"listingId":"54ffd13f-3346-43dc-81e2-d34f63da9000","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/157","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:28.411Z","lastSeenAt":"2026-04-22T08:31:03.886Z"}],"details":{"listingId":"54ffd13f-3346-43dc-81e2-d34f63da9000","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/157 \\\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 x402 version 1, maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/157"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/157"},{"claim":"All 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 platform lists endpoints 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 API consumption without pre-registration or API key management","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC payments on Base per call","Users who want zero-commitment, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.313Z"},"updatedAt":"2026-04-22T08:31:03.886Z"}}