{"id":"ef500b3c-a656-4676-8071-fbcb350c1124","shortId":"zMhWta","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 on the Base network. The specific resource path `/api/v1/transactions/361` is one of many endpoints offered by this provider, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.\n\nThe provider advertises a flat $0.02 per request pricing model with no API keys, no rate limits, and instant access. Payment is settled in USDC (USD Coin) on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge confirms a maxAmountRequired of 20000 base units, which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json responses.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. The specific functionality of the `/api/v1/transactions/361` path is unclear; it may relate to a transaction lookup or processing endpoint, but no schema or example payloads are documented. The broader site lists endpoints for analytics, AI inference (sentiment, summarization, classification, embeddings), finance (price feeds, exchange rates, crypto quotes, gas estimates), and utilities (geocoding, validation, conversion, generation), all at the same $0.02 price point.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","finance"],"synonyms":["low payment fee API","x402 premium access","Base USDC API","pay-per-call API","micropayment API","crypto-paid endpoint"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","The specific functionality of /api/v1/transactions/361 is unknown","No request body schema or response schema documented","No OpenAPI spec or AI plugin manifest available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/361","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/transactions/361","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) with clear pricing, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. No request/response schema, no examples, and the specific purpose of /api/v1/transactions/361 is 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'/request':13,28 '0.02':12,27,81,119,215 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':106 '20000':114 '6':123 'Base USDC API' 'accept':127 'access':7,22,38,95 'advertis':78 'ai':68,190 'analyt':67,189 'api':6,21,37,88,140 'application/json':132 'base':9,24,46,104,115 'broader':184 'call':4,19 'categori':64 'challeng':109 'classif':194 'coin':102 'confirm':110 'connect':149 'content':155 'contract':105 'convers':209 'crypto':201 'crypto-paid endpoint' 'data':66 'decim':124 'doc':139 'document':134,182 'embed':195 'endpoint':32,57,126,174,187 'equal':118 'estim':204 'exampl':179 'exchang':199 'extrem':136 'feed':198 'financ':71,196 'flat':80 'function':158 'gas':203 'generat':210 'geocod':207 'given':120 'includ':65 'infer':191 'infrastructur':74 'instant':94 'json-response' 'key':89 'learn':70 'limit':92 'list':186 'lookup':171 'low payment fee API' 'lowpaymentfee.com':34 'machin':69 'mani':56 'maxamountrequir':112 'may':166 'micropayment API' 'model':85 'network':47 'no-api-key' 'no-rate-limit' 'offer':58 'one':54 'page':144 'path':51,162 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':180 'payment':42,96 'per':3,18,82 'point':217 'post':128 'premium':5,20,36 'price':84,141,197,216 'process':173 'prompt':151 'protocol':43 'provid':35,61,77 'quot':202 'rate':91,200 'readm':143 'relat':167 'render':146 'request':83,129 'resourc':50 'respons':133 'return':131 'schema':177 'sentiment':192 'settl':98 'site':185 'span':63 'spars':137 'specif':49,157 'summar':193 'transact':170 'unclear':164 'unit':116 'usd':101 'usdc':15,30,100,121 'usdc-base' 'util':75,206 'valid':208 'via':10,25,39 'wallet':150 'web3':72 'x402':11,26,41,108 'x402 premium access' 'x402-payment'","prices":[{"id":"43633540-3eb2-46b3-8471-273a790c4b8f","listingId":"ef500b3c-a656-4676-8071-fbcb350c1124","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/transactions/361","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:23.478Z"}],"sources":[{"listingId":"ef500b3c-a656-4676-8071-fbcb350c1124","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/361","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:23.478Z","lastSeenAt":"2026-04-22T13:31:51.388Z"}],"details":{"listingId":"ef500b3c-a656-4676-8071-fbcb350c1124","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/361 \\\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":"Flat pricing of $0.02 per request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment in USDC on Base network, maxAmountRequired 20000 base units (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/361"},{"claim":"USDC asset contract: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/361"}],"useCases":["Accessing premium data or transaction information without subscription commitments","Agent-driven API consumption with per-call crypto payments","Programmatic access to services without managing API keys"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation before integrating","High-volume consumers who would benefit from bulk pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.038Z"},"updatedAt":"2026-04-22T13:31:51.388Z"}}