{"id":"a3c49604-06db-40e8-b19d-50cc87ef6819","shortId":"f5CPQq","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, $0.02/request in USDC.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" transaction receipt resource via the x402 payment protocol. It is part of a broader platform offering multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities—all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/transactions/301/receipt` accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The x402 challenge is live and well-formed, with a 300-second payment timeout.\n\nDocumentation on the site is extremely sparse—most pages beyond the landing page only show a \"Connect wallet\" prompt. There is no OpenAPI spec, no detailed request/response schema, and no examples of what the receipt payload actually contains. The endpoint name suggests it returns a receipt for a specific transaction (ID 301), but the exact fields and semantics are undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment endpoint"],"warnings":["No OpenAPI or schema documentation available","All documentation pages beyond the landing page return only 'Connect wallet' with no content","The exact payload returned by this endpoint is undocumented","Purpose of 'transaction 301 receipt' is unclear—may be a demo or placeholder"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/301/receipt","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/301/receipt","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 OpenAPI spec, no request/response examples, and the purpose of this specific receipt endpoint is unclear beyond its 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'/request':13,28 '0.02':12,27,73,118 '000':114 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':107 '20':113 '300':135 '301':190 '6':122 'Base network API' 'USDC micropayment API' 'accept':91 'access':39 'actual':175 'ai':62 'amount':111 'analyt':61 'api':38,57,78 'base':9,24,102,115 'base-network' 'beyond':148 'broader':53 'call':4,19 'categori':58 'challeng':126 'commit':85 'connect':155 'contain':176 'contract':106 'crypto payment endpoint' 'data':60 'decim':123 'detail':164 'document':139 'endpoint':7,22,32,89,178 'exact':193 'exampl':169 'extrem':144 'field':194 'financ':65 'form':132 'given':119 'i.e':117 'id':189 'includ':59 'infrastructur':68 'json':96 'json-response' 'key':79 'land':150 'learn':64 'limit':82 'live':128 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':63 'maximum':110 'multipl':56 'name':179 'network':103 'no-api-key' 'offer':55 'openapi':161 'page':147,151 'part':50 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':174 'payment':46,97,137 'per':3,18,74 'platform':54 'post':92 'premium':37 'price':71 'prompt':157 'protocol':47 'provid':35 'rate':81 'receipt':6,21,41,173,184 'request':75,93 'request/response':165 'requir':86 'resourc':42 'return':95,182 'schema':166 'second':136 'semant':196 'settl':99 'show':153 'site':142 'spars':145 'spec':162 'specif':88,187 'suggest':180 'timeout':138 'transact':5,20,40,188 'transaction receipt API' 'transaction-receipt' 'undocu':198 'unit':116 'usdc':15,30,105,120 'usdc-settlement' 'use':104 'util':69 'via':10,25,43 'wallet':156 'web3':66 'well':131 'well-form':130 'x402':11,26,45,125 'x402 endpoint' 'x402-payment'","prices":[{"id":"a5448403-e2fe-4c98-b7b4-8aa003b508dd","listingId":"a3c49604-06db-40e8-b19d-50cc87ef6819","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/301/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:53.175Z"}],"sources":[{"listingId":"a3c49604-06db-40e8-b19d-50cc87ef6819","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/301/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:53.175Z","lastSeenAt":"2026-04-24T12:04:10.191Z"}],"details":{"listingId":"a3c49604-06db-40e8-b19d-50cc87ef6819","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/301/receipt \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","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 network, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/301/receipt"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/301/receipt"}],"useCases":["Retrieving a transaction receipt for a completed payment","Programmatic verification of transaction details via paid API","Agent-driven workflows requiring proof-of-transaction data"],"bestFor":["Developers needing low-cost per-call API access without subscriptions","AI agents that can settle payments on Base in USDC","Use cases requiring no-signup, instant API access"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch processing where per-call pricing may add up","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.496Z"},"updatedAt":"2026-04-24T12:04:10.191Z"}}