{"id":"dcd4f00b-7a61-4b96-abc8-dba488306f1e","shortId":"GkpA9y","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/254` 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 `X-PAYMENT` header — 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/254`) is labeled only as \"Premium API Access\" and its exact functionality is not documented beyond that label.\n\nThe endpoint is confirmed live — it returns a proper 402 challenge with x402 version 1 semantics, a 300-second payment timeout, and the `exact` payment scheme. Documentation on the site is extremely sparse; the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"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 request/response schema provided; it is unclear what this endpoint actually returns","The specific functionality of /api/v1/charges/254 ('Premium API Access') is not described anywhere in the crawled material","The broader site lists many endpoint categories (AI, analytics, finance, etc.) but none map directly to this /charges/254 path"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/254","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/254","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 there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/charges/254 is completely undocumented. The site's docs pages are empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,70,147 '000':57 '0x8335':62 '1':189 '20':56 '2913':63 '300':192 '402':184 '6':75 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,164 'account':91 'across':106 'advertis':101 'ai':116 'analysi':120 'analyt':110 'api':6,21,37,89,163,210 'avail':239 'base':9,24,58,66 'beyond':172 'broader':98 'call':4,19 'categori':108 'challeng':185 'charg':53 'classif':123 'confirm':178 'connect':219 'convers':140 'crawl':242 'crypto-paid endpoint' 'data':109,113 'decim':76 'detail':226 'doc':209 'document':171,201 'embed':124 'endpoint':32,105,143,153,176 'entir':80 'equal':69 'estim':134 'exact':167,198 'exampl':238 'exchang':129 'export':114 'extrem':206 'feed':128 'financ':125 'four':107 'function':168 'gas':133 'generat':141 'geocod':138 'handl':79 'header':87 'howev':150 'infrastructur':136 'insight':115 'key':90 'label':159,174 'learn':118 'limit':94 'list':145,155 'live':179 'lowpaymentfee' 'lowpaymentfee.com':34,99 'machin':117 'materi':243 'metric':111 'network':67 'no-api-key' 'openapi':230 'page':214 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,77,86,194,199 'per':3,18,71,148 'platform':100 'post':50 'post-endpoint' 'premium':5,20,36,162 'premium API access' 'price':127,211 'prompt':221 'proper':183 'protocol':43 'provid':35 'quot':132 'rate':93,130 'readm':213 'render':216 'report':112 'request':51,72,149 'request/response':233 'requir':96 'resourc':46 'return':181 'schema':234 'scheme':200 'second':193 'semant':190 'sentiment':119 'site':204 'spars':207 'spec':231 'specif':45,152 'suit':103 'summar':122 'technic':225 'text':121 'timeout':195 'token':131 'unit':59 'usag':237 'usdc':15,30,61,73 'usdc-base' 'use':74 'util':137 'valid':139 'version':188 'via':10,25,39 'wallet':220 'web3':126 'x':85 'x-payment':84 'x402':11,26,41,83,187 'x402 API' 'x402-payment'","prices":[{"id":"70deb50e-b418-439f-ac2a-7cfceb1999d5","listingId":"dcd4f00b-7a61-4b96-abc8-dba488306f1e","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/254","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:47.238Z"}],"sources":[{"listingId":"dcd4f00b-7a61-4b96-abc8-dba488306f1e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/254","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:47.238Z","lastSeenAt":"2026-04-24T02:32:12.761Z"}],"details":{"listingId":"dcd4f00b-7a61-4b96-abc8-dba488306f1e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/254 \\\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":"Endpoint returns a 402 challenge with x402 version 1, maxAmountRequired 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/254"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/254"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API services without needing an API key or subscription","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that need keyless, pay-as-you-go API access","Low-cost per-request access without rate limits or commitments"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.407Z"},"updatedAt":"2026-04-24T02:32:12.761Z"}}