{"id":"5f9b6167-108a-4b20-b457-010bcd187877","shortId":"abutQ3","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, settling in USDC on the Base network. The specific resource `/api/v1/transactions/159` is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.\n\nThe platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and instant access. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed payment to the provider's address (0x1A2B...85F3) using USDC (contract 0x8335...2913) on Base. The x402 challenge confirms a maxAmountRequired of 20000 base units, which equals $0.02 given USDC's 6 decimals.\n\nDocumentation is extremely sparse — 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 documentation, and no examples of what data this specific `/transactions/159` endpoint returns. The platform lists many endpoints but provides no detail on input parameters or output formats beyond endpoint names and brief labels.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — docs/pricing/README pages only show 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","Purpose of /api/v1/transactions/159 specifically is unclear — could be a demo or placeholder","No evidence of what data is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/159","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/159","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response examples, and no explanation of what the /transactions/159 resource actually returns. Effectively a stub 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'/request':13,28 '/transactions/159':189 '0.02':12,27,83,143 '0x1a2b':122 '0x8335':127 '20000':138 '2913':128 '6':147 '85f3':123 'Base network API' 'USDC micropayment API' 'access':7,22,38,98 'across':86 'addit':169 'address':121 'advertis':80 'ai':70 'analyt':69 'api':6,21,37,91,155 'base':9,24,49,130,139 'beyond':207 'brief':211 'call':4,19 'caller':106 'categori':66 'challeng':133 'confirm':134 'connect':164 'contract':126 'crypto-paid API' 'data':68,186 'decim':148 'detail':171,200 'doc':154 'document':149,180 'endpoint':32,59,88,190,196,208 'equal':142 'exampl':183 'extrem':151 'financ':73 'flat':82 'format':206 'given':144 'handl':101 'header':112 'includ':67,107 'infrastructur':76 'input':202 'instant':97 'json-response' 'key':92 'label':212 'learn':72 'limit':95 'list':194 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':71 'mani':58,195 'maxamountrequir':136 'name':209 'network':50 'no-api-key' 'no-rate-limit' 'offer':60 'one':56 'openapi':175 'output':205 'page':159 'paramet':203 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,99,111,116 'per':3,18,84 'platform':63,79,193 'premium':5,20,36 'premium API access' 'price':156 'prompt':166 'protocol':43,105 'provid':35,119,198 'rate':94 'readm':158 'render':161 'request':85 'request/response':178 'resourc':53 'return':191 'schema':179 'settl':44 'sign':115 'span':65 'spars':152 'spec':176 'specif':52,188 'technic':170 'unit':140 'usdc':15,30,46,125,145 'usdc-base' 'use':124 'util':77 'via':10,25,39,102 'wallet':165 'web3':74 'x':110 'x-payment':109 'x402':11,26,41,104,132 'x402 API' 'x402-payment'","prices":[{"id":"49d7ff1b-4f13-419e-a639-d72bc4fed054","listingId":"5f9b6167-108a-4b20-b457-010bcd187877","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/159","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:38.793Z"}],"sources":[{"listingId":"5f9b6167-108a-4b20-b457-010bcd187877","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/159","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:38.793Z","lastSeenAt":"2026-04-25T18:04:12.443Z"}],"details":{"listingId":"5f9b6167-108a-4b20-b457-010bcd187877","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/159 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms maxAmountRequired of 20000 base units in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/159"}],"useCases":["Accessing premium data or transaction information without traditional API key registration","Programmatic pay-per-use API calls settled in USDC on Base","Agent-driven workflows requiring instant, keyless API access"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents with crypto wallets needing on-demand data","Users who prefer micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.545Z"},"updatedAt":"2026-04-25T18:04:12.443Z"}}