{"id":"30fd05ca-e3b7-4497-bb62-3de743bea163","shortId":"vNRqhY","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/292` is listed under the x402 challenge with a maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, which has 6 decimals), equating to $0.02 per call. Payment is made via the x402 X-PAYMENT header. The endpoint accepts POST requests and returns application/json responses.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular transactions endpoint returns. The platform advertises simplicity (no keys, no rate limits, instant access), but the lack of documentation makes it difficult to determine the actual functionality of this specific endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No API documentation available — docs/pricing/README pages only show 'Connect wallet'","No OpenAPI spec or request/response schema provided","Unclear what data or functionality this specific transactions endpoint provides","Platform appears to be a generic x402 demo or placeholder with many undocumented endpoints"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/292","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/292","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) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no examples. The specific functionality of /api/v1/transactions/292 is entirely 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'/request':15,32 '0.02':14,31,75,119 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20000':105 '402 payment required' '6':115 'Base network API' 'USDC micropayment API' 'accept':134 'access':7,24,42,196 'actual':208 'advertis':188 'ai':64 'analyt':63 'api':6,23,41,84,150 'application/json':139 'base':9,26,80,106,112 'call':4,21,121 'categori':60 'challeng':100 'commit':89 'connect':159 'cost':74 'crypto payment API' 'data':62 'decim':116 'detail':166 'determin':206 'difficult':204 'doc':149 'document':141,175,201 'endpoint':36,53,93,133,184,213 'equat':117 'exampl':178 'extrem':146 'financ':67 'function':209 'header':131 'includ':61 'infrastructur':70 'instant':195 'json-response' 'key':85,191 'lack':199 'learn':66 'limit':87,194 'list':96 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':65 'made':124 'make':202 'mani':52 'maxamountrequir':103 'network':81 'no-api-key' 'offer':54 'one':50 'openapi':170 'page':154 'particular':182 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':46,122,130 'per':3,20,120 'platform':57,187 'post':135 'post-method' 'premium':5,22,40 'price':151 'prompt':161 'protocol':12,29,47 'provid':39 'rate':86,193 'readm':153 'render':156 'request':73,136 'request/response':173 'requir':90 'respons':140 'return':138,185 'schema':174 'simplic':189 'site':144 'span':59 'spars':147 'spec':171 'specif':92,212 'technic':165 'transact':183 'unit':107 'usdc':17,34,77,109 'usdc-base' 'util':71 'via':10,27,43,125 'wallet':160 'web3':68 'x':129 'x-payment':128 'x402':11,28,45,99,127 'x402 API' 'x402-payment'","prices":[{"id":"cda65ec2-4e24-4e8d-a609-8f299c21a1af","listingId":"30fd05ca-e3b7-4497-bb62-3de743bea163","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/292","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:51.614Z"}],"sources":[{"listingId":"30fd05ca-e3b7-4497-bb62-3de743bea163","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/292","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:51.614Z","lastSeenAt":"2026-04-24T13:32:37.129Z"}],"details":{"listingId":"30fd05ca-e3b7-4497-bb62-3de743bea163","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/292 \\\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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/292"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/292"}],"useCases":["Accessing premium data or transaction information without subscription commitments","Programmatic pay-per-use API consumption by AI agents","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing low-cost per-call API access without authentication setup","Use cases requiring no rate limits and instant access"],"notFor":["Users needing detailed API documentation or schemas before integration","High-volume use cases where per-request pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.016Z"},"updatedAt":"2026-04-24T13:32:37.129Z"}}