{"id":"0c94bce8-3032-49ea-a5f7-d4a33937029c","shortId":"GHsaMx","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402 protocol, $0.02/request in USDC.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402 protocol, $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/138/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 confirms the endpoint is live and discoverable, 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 schema for request/response bodies, and no examples of what the receipt payload actually contains. The platform's value proposition centers on frictionless, wallet-based micropayments without traditional authentication, but the actual data returned by this specific receipt endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","transaction-receipt","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment endpoint","402 payment required"],"warnings":["No OpenAPI spec or detailed documentation available","Response schema for the receipt endpoint is completely undocumented","Most site pages (docs, api, pricing, README) only show 'Connect wallet' with no content","The specific transaction ID (138) in the path suggests this may be a single-resource endpoint rather than a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/138/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/138/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 request/response schema, no examples, and the actual purpose of the 'receipt' resource is unexplained. Most site pages render only a wallet-connect 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'/request':14,30 '0.02':13,29,75,120 '000':116 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':109 '20':115 '300':138 '402 payment required' '6':124 'Base network API' 'USDC pay-per-call' 'accept':93 'access':41 'actual':180,199 'ai':64 'amount':113 'analyt':63 'api':40,59,80 'authent':196 'base':9,25,104,117,192 'beyond':151 'bodi':171 'broader':55 'call':4,20 'categori':60 'center':187 'challeng':128 'commit':87 'confirm':129 'connect':158 'contain':181 'contract':108 'crypto payment endpoint' 'data':62,200 'decim':125 'detail':167 'discover':135 'document':142 'endpoint':7,23,34,91,131,206 'exampl':174 'extrem':147 'financ':67 'frictionless':189 'given':121 'i.e':119 'includ':61 'infrastructur':70 'json':98 'json-response' 'key':81 'land':153 'learn':66 'limit':84 'live':133 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':65 'maximum':112 'micropay':193 'multipl':58 'network':105 'no-api-key' 'offer':57 'openapi':164 'page':150,154 'part':52 'pay':2,18 'pay-per-cal':1,17 'pay-per-request' 'payload':179 'payment':48,99,140 'per':3,19,76 'platform':56,183 'post':94 'premium':39 'price':73 'prompt':160 'proposit':186 'protocol':12,28,49 'provid':37 'rate':83 'receipt':6,22,43,178,205 'request':77,95 'request/response':170 'requir':88 'resourc':44 'return':97,201 'schema':168 'second':139 'settl':101 'show':156 'site':145 'spars':148 'spec':165 'specif':90,204 'timeout':141 'tradit':195 'transact':5,21,42 'transaction receipt API' 'transaction-receipt' 'undocu':208 'unit':118 'usdc':16,32,107,122 'usdc-base-network' 'use':106 'util':71 'valu':185 'via':10,26,45 'wallet':159,191 'wallet-bas':190 'web3':68 'without':194 'x402':11,27,47,127 'x402 micropayment' 'x402-payment'","prices":[{"id":"d8087c6e-15d4-4d9f-8e0c-8241d8ff455d","listingId":"0c94bce8-3032-49ea-a5f7-d4a33937029c","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/138/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":"2026-04-18T18:58:29.161Z"}],"sources":[{"listingId":"0c94bce8-3032-49ea-a5f7-d4a33937029c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/138/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:29.161Z","lastSeenAt":"2026-04-25T00:05:09.467Z"}],"details":{"listingId":"0c94bce8-3032-49ea-a5f7-d4a33937029c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/138/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 base units","source_url":"https://lowpaymentfee.com/api/v1/transactions/138/receipt"},{"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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/138/receipt"}],"useCases":["Retrieving a transaction receipt after completing a payment flow","Programmatic verification of transaction completion","Agent-driven micropayment workflows on Base network"],"bestFor":["Developers building x402-compatible payment agents","Applications needing frictionless per-call API access without API keys","Crypto-native workflows settling in USDC on Base"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume batch processing where per-call pricing is inefficient","Non-crypto workflows requiring traditional auth (OAuth, API keys)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.953Z"},"updatedAt":"2026-04-25T00:05:09.467Z"}}