{"id":"7e1d7531-6f26-4807-bb9e-bf66038f14d2","shortId":"nzY74C","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a transaction receipt resource at `/api/v1/transactions/124/receipt`. It is part of a broader platform offering multiple API categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced uniformly at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint probed returns a 402 Payment Required challenge requesting payment of 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 USD (USDC uses 6 decimals). Payment is made via the x402 exact scheme, with a 300-second timeout. The response MIME type is `application/json`. The endpoint accepts POST requests and is marked as discoverable.\n\nThe platform's landing page lists 16 endpoints across four categories, all at the same $0.02 price point. However, documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for any endpoint. The actual data or functionality behind this particular receipt endpoint is unclear — the description simply says \"Premium API Access\" with no further detail on what the receipt contains or what inputs it expects.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","json-response","no-api-key","transaction-receipt"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment endpoint"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) return no useful content — only a 'Connect wallet' prompt.","No OpenAPI or schema definition is available for any endpoint on the platform.","The specific resource at /api/v1/transactions/124/receipt has no documented input parameters or response format.","It is unclear whether the hardcoded transaction ID '124' is meaningful or if this is a demo/placeholder endpoint.","The platform lists 16 endpoints but none have detailed documentation; actual functionality is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/124/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/124/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of this specific receipt endpoint is unclear beyond its generic 'Premium API Access' 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'/api/v1/transactions/124/receipt':48 '/docs':171 '/pricing':172 '/readme':174 '/request':17,34 '0.02':16,33,74,115,165 '000':102 '0x8335':107 '16':156 '20':101 '2913':108 '300':131 '402':94 '6':119 'Base network API' 'USDC pay-per-call' 'accept':142 'access':220 'across':158 'actual':203 'ai':62 'analyt':61 'api':58,79,219 'application/json':139 'avail':198 'base':9,26,103,111 'base-network' 'behind':207 'broader':54 'call':4,21 'categori':59,160 'challeng':97 'commit':86 'connect':179 'contain':229 'content':185 'crypto payment endpoint' 'data':60,204 'decim':120 'descript':215 'detail':196,224 'discover':149 'document':169,197 'enabl':38 'endpoint':7,24,39,90,141,157,201,211 'equal':114 'exact':127 'exampl':193 'expect':234 'financ':65 'four':159 'function':206 'howev':168 'infrastructur':68 'input':232 'json-response' 'key':80 'land':153 'learn':64 'limit':83 'list':155 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':63 'made':123 'mark':147 'micropayment API' 'mime':136 'multipl':57 'network':112 'no-api-key' 'offer':56 'openapi':189 'page':154,170 'part':51 'particular':209 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'payment':95,99,121 'per':3,20,75 'platform':55,151 'point':167 'post':143 'premium':218 'price':71,166 'probe':91 'prompt':181 'provid':42 'rate':82 'receipt':6,23,45,210,228 'request':76,98,144 'request/response':192 'requir':87,96 'resourc':46 'respons':135 'return':92,176 'say':217 'schema':190 'scheme':128 'second':132 'settl':12,29 'simpli':216 'specif':89 'substant':184 'timeout':133 'transact':5,22,44 'transaction receipt API' 'transaction-receipt' 'type':137 'unclear':213 'uniform':72 'unit':104 'usd':116 'usdc':14,31,106,117 'usdc-settlement' 'use':118 'util':69 'via':10,27,124 'wallet':180 'web3':66 'x402':11,28,37,126 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"7b195337-4c04-4d75-aae0-f4f97b9f0846","listingId":"7e1d7531-6f26-4807-bb9e-bf66038f14d2","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/124/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":"2026-04-18T18:58:22.556Z"}],"sources":[{"listingId":"7e1d7531-6f26-4807-bb9e-bf66038f14d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/124/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:22.556Z","lastSeenAt":"2026-04-25T01:32:59.790Z"}],"details":{"listingId":"7e1d7531-6f26-4807-bb9e-bf66038f14d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/124/receipt\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with valid payment proof to receive the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base network with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/124/receipt"},{"claim":"The platform lists 16 endpoints across four categories all priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/124/receipt"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction ID 124 via a single paid API call","Demonstrating x402 payment flow integration with USDC on Base","Agent-driven pay-per-use API consumption without pre-registration"],"bestFor":["Developers experimenting with x402 payment protocols","Agents needing keyless, pay-per-call API access on Base","Projects requiring low-cost micropayment-gated endpoints"],"notFor":["Production workloads requiring documented request/response schemas","Users who need detailed API documentation or SDKs","Bulk data retrieval where per-call pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.21Z"},"updatedAt":"2026-04-25T01:32:59.790Z"}}