{"id":"97e9c536-02e8-4092-a305-43887f5ebe77","shortId":"dJC7Br","kind":"x402","title":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. Each request costs $0.02 in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/transactions/37` is listed under the platform's x402-gated services. The 402 challenge confirms it accepts POST requests, settles in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, and charges a maximum of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no description of what data or functionality this particular transactions endpoint returns. The platform advertises a broad suite of endpoints but provides minimal information about their actual behavior or output formats.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","transaction API"],"warnings":["No API documentation available — docs/pricing/API pages only show 'Connect wallet'","No OpenAPI spec or response schema provided","Purpose of /api/v1/transactions/37 is unclear — 'Premium API Access' is generic","Cannot verify what data or functionality this endpoint actually delivers"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/37","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/37","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 request/response schema, and no explanation of what the endpoint actually returns. The docs pages are empty beyond a wallet connect 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'/request':15,32 '0.02':14,31,75,130 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':142 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':125 '300':145 '402':106 '6':134 'Base network API' 'USDC micropayment API' 'accept':110 'access':7,24,42 'actual':205 'address':141 'advertis':193 'ai':64 'analyt':63 'api':6,23,41,84,156 'base':9,26,80,119,127 'base-network' 'behavior':206 'broad':195 'call':4,21 'categori':60 'challeng':107 'charg':121 'commit':89 'confirm':108 'connect':162 'contract':116 'cost':74 'data':62,183 'decim':135 'descript':180 'detail':169 'direct':139 'doc':153 'document':148 'endpoint':36,53,93,189,198 'extrem':150 'financ':67 'format':209 'function':185 'gate':103 'given':131 'i.e':129 'includ':61 'inform':202 'infrastructur':70 'key':85 'learn':66 'limit':87 'list':96 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':65 'mani':52 'maximum':123 'minim':201 'network':81 'no-api-key' 'offer':54 'one':50 'openapi':173 'output':208 'page':157 'particular':187 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':46,137 'per':3,20 'platform':57,99,192 'post':111 'post-method' 'premium':5,22,40 'premium API' 'price':154 'prompt':164 'protocol':12,29,47 'provid':39,200 'rate':86 'render':159 'request':73,112 'request/response':176 'requir':90 'return':190 'schema':177 'second':146 'servic':104 'settl':113 'span':59 'spars':151 'spec':174 'specif':92 'suit':196 'technic':168 'timeout':147 'transact':188 'transaction API' 'unit':128 'usdc':17,34,77,115,132 'usdc-settlement' 'util':71 'via':10,27,43 'wallet':163 'web3':68 'x402':11,28,45,102 'x402 endpoint' 'x402-gated':101 'x402-payment'","prices":[{"id":"fd716851-c7be-4d89-b0cc-207012a6e0c8","listingId":"97e9c536-02e8-4092-a305-43887f5ebe77","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:29.469Z"}],"sources":[{"listingId":"97e9c536-02e8-4092-a305-43887f5ebe77","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:29.469Z","lastSeenAt":"2026-04-24T06:32:43.006Z"}],"details":{"listingId":"97e9c536-02e8-4092-a305-43887f5ebe77","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/37 \\\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":"Platform charges $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms USDC on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/37"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/37"}],"useCases":["Accessing premium data or transaction information without subscription commitments","Programmatic pay-per-use API consumption settled in USDC on Base","Agent-driven API calls where no API key provisioning is desired"],"bestFor":["Developers wanting zero-commitment pay-per-call API access","AI agents that can settle payments via x402 protocol on Base","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume use cases where per-request pricing may be inefficient","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.759Z"},"updatedAt":"2026-04-24T06:32:43.006Z"}}