{"id":"02744eda-c179-4fdc-8acd-2312128b3ba2","shortId":"CYknNC","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/167` 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. There are no API keys, no rate limits, and no signup required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe platform's landing page lists additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more, all at the same $0.02 price point. However, the specific functionality behind `/api/v1/accounts/167` is not documented beyond the generic label \"Premium API Access.\" No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["The specific functionality of /api/v1/accounts/167 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI schema, request body schema, or response examples were found.","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.","The platform lists many endpoints but none have detailed documentation in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/167","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/167","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/accounts/167 is entirely unclear beyond the generic 'Premium API Access' label. Docs pages returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,78,125,180 '000':115 '0x8335':99 '20':114 '2913':100 '6':120 'Base network API' 'USDC API access' 'access':7,22,38,198 'addit':158 'advertis':60 'ai':67 'amount':111 'analysi':162 'analyt':66 'api':6,21,37,129,197,214 'appear':48 'attach':140 'base':9,24,103,116 'behind':187 'beyond':192 'broad':62 'call':4,19 'caller':138 'catalog':63 'challeng':90 'classif':165 'connect':223 'content':229 'contract':98 'convers':173 'crawl':211 'data':65 'decim':121 'detail':205 'doc':213 'document':191,206 'embed':166 'endpoint':32,54,82,159 'equal':124 'exact':107 'exampl':203 'exchang':169 'feed':168 'financ':70 'found':208 'function':186 'generic':194 'geocod':171 'header':145 'howev':183 'infrastructur':73 'json-response' 'key':130 'label':195 'land':155 'learn':69 'limit':133 'list':157 'live':84 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'mani':53 'maximum':110 'micropayment API' 'network':104 'no-api-key' 'no-rate-limit' 'offer':55 'one':51 'openapi':200 'page':156,218 'path':46 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,93,144,150 'per':3,18,79 'platform':58,153 'point':182 'post':92 'premium':5,20,36,196 'price':76,167,181,215 'prompt':225 'proof':151 'protocol':43 'provid':35 'rate':132,170 'readm':217 'request':80 'request/response':202 'requir':112,137 'return':86,220 'schema':201 'scheme':108 'sentiment':161 'settl':95 'signup':136 'simpli':139 'span':64 'specif':45,185 'substant':228 'summar':164 'text':163 'unit':117 'usdc':15,30,97,123 'usdc-base' 'use':105 'util':74 'valid':88,148,172 'via':10,25,39 'wallet':224 'web3':71 'x':143 'x-payment':142 'x402':11,26,41,89,149 'x402 API' 'x402-payment'","prices":[{"id":"64133452-f469-443c-8362-57d9fb67b9d6","listingId":"02744eda-c179-4fdc-8acd-2312128b3ba2","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/167","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:20.513Z"}],"sources":[{"listingId":"02744eda-c179-4fdc-8acd-2312128b3ba2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/167","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:20.513Z","lastSeenAt":"2026-04-22T16:31:00.735Z"}],"details":{"listingId":"02744eda-c179-4fdc-8acd-2312128b3ba2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/167 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/167"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/167"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without signup or API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Programmatic access to account-level data at micro-transaction pricing"],"bestFor":["Developers wanting zero-friction, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","Anyone requiring non-crypto (fiat) payment methods","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.503Z"},"updatedAt":"2026-04-22T16:31:00.735Z"}}