{"id":"39e6fea2-6826-411d-a2c9-e05e99fc1243","shortId":"Gp8gJn","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 path `/api/v1/accounts/199` appears to be one of many endpoints offered by the platform, which advertises a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nThe endpoint is live and returns a valid x402 challenge on POST. Payment is settled in USDC (contract 0x8335…2913) on the Base network using the \"exact\" scheme. The maximum amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. No API keys are needed; callers pay per request by attaching an X-PAYMENT header. The challenge specifies a 300-second timeout window.\n\nWhile the platform lists many endpoints (metrics, reports, sentiment analysis, summarization, embeddings, price feeds, geocoding, etc.), the specific functionality of `/api/v1/accounts/199` is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. The actual data returned by this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay per call API","USDC API","Base network API","micropayment API"],"warnings":["The specific functionality of /api/v1/accounts/199 is not documented — 'Premium API Access' is a generic label","No OpenAPI schema or request/response examples are available","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content","The broader platform lists many endpoints but none have detailed documentation visible in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/199","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/accounts/199","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 specific functionality of /api/v1/accounts/199 is entirely undocumented. The docs pages render only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,78,125 '000':115 '0x8335':99 '20':114 '2913':100 '300':146 '6':120 'Base network API' 'USDC API' 'access':7,22,38,180 'actual':208 'addit':205 'advertis':60 'ai':67 'amount':111 'analysi':159 'analyt':66 'api':6,21,37,127,179,194 'appear':48 'attach':136 'base':9,24,103,116 'base-network' 'beyond':174 'broad':62 'call':4,19 'caller':131 'catalog':63 'challeng':90,143 'connect':200 'content':206 'contract':98 'data':65,209 'decim':121 'doc':191 'document':173 'embed':161 'endpoint':32,54,82,155,213 'equal':124 'etc':165 'exact':107 'exampl':188 'feed':163 'financ':70 'function':168 'generic':176 'geocod':164 'header':141 'infrastructur':73 'json-response' 'key':128 'label':177 'learn':69 'list':153 'live':84 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'mani':53,154 'maximum':110 'metric':156 'micropayment API' 'need':130 'network':104 'no-api-key' 'offer':55 'one':51 'openapi':184 'page':195 'path':46 'pay':2,17,132 'pay per call API' 'pay-per-cal':1,16 'pay-per-request' 'payment':42,93,140 'per':3,18,79,133 'platform':58,152 'post':92 'premium':5,20,36,178 'price':76,162,192 'prompt':202 'protocol':43 'provid':35 'render':197 'report':157 'request':80,134 'request/response':187 'requir':112 'return':86,210 'schema':185 'scheme':108 'second':147 'sentiment':158 'settl':95 'span':64 'specif':45,167 'specifi':144 'summar':160 'timeout':148 'unit':117 'unknown':215 'usdc':15,30,97,123 'usdc-settlement' 'use':105 'util':74 'valid':88 'via':10,25,39 'wallet':201 'web3':71 'window':149 'x':139 'x-payment':138 'x402':11,26,41,89 'x402 API' 'x402-payment'","prices":[{"id":"dd1a0525-255d-4d18-aceb-7069c603a523","listingId":"39e6fea2-6826-411d-a2c9-e05e99fc1243","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/accounts/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:42.773Z"}],"sources":[{"listingId":"39e6fea2-6826-411d-a2c9-e05e99fc1243","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:42.773Z","lastSeenAt":"2026-04-22T15:01:02.410Z"}],"details":{"listingId":"39e6fea2-6826-411d-a2c9-e05e99fc1243","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/199\n# Returns 402 with x402 challenge. Attach X-PAYMENT header with signed USDC payment on Base to access.","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/199"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/199"},{"claim":"The platform lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or account information via a single paid API call","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Programmatic access to account-level data without subscription commitments"],"bestFor":["Developers wanting zero-commitment, per-request API billing","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto-native pay-per-use over API key management"],"notFor":["Users needing well-documented, schema-validated API contracts","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:32.371Z"},"updatedAt":"2026-04-22T15:01:02.410Z"}}