{"id":"773626d8-8f61-4c8f-8bfa-a234b7d2bdbb","shortId":"KpLJFS","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","tagline":"x402-gated transaction receipt endpoint on Base, paying $0.02 in USDC per request.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (specifically for transaction ID 75) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per call, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/75/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an X-PAYMENT header with a valid payment proof. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /api, /README) all resolve but appear to require a wallet connection to view content, so detailed schema information for request/response bodies is not available from the crawl. The broader site lists 16 endpoints across four categories, all at the same $0.02 price point. Without deeper documentation, the exact fields returned in the receipt response or the expected POST body remain unknown.","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 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","receipt endpoint"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt — no usable docs available without wallet authentication.","No request body schema or response schema is documented or discoverable.","The endpoint is for a specific transaction ID (75); it is unclear whether this is a demo resource or a real transaction receipt.","The broader platform lists many endpoints but none have detailed documentation available from the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/75/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/75/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). However, there is no OpenAPI schema, no request/response examples, and all documentation pages require wallet connection, yielding no usable content. The specific purpose of this particular receipt endpoint (transaction 75) is 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'/api/v1/transactions/75/receipt':90 '/docs':168 '/pricing':169 '/readme':171 '0.02':10,24,77,135,210 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':130 '16':201 '20':124 '300':152 '6':139 '75':42 'Base network API' 'USDC micropayment API' 'accept':91 'access':165 'across':203 'address':146 'advertis':120,156 'ai/ml':67 'analyt':66 'api':63,158 'appear':175 'avail':193 'base':8,22,85,126,132 'base-network' 'behind':43 'bodi':190,228 'broader':52,198 'call':79 'caller':104 'categori':205 'challeng':119 'connect':180 'content':183 'crawl':196 'data':65,70 'decim':140 'deeper':214 'detail':185 'document':166,215 'endpoint':6,20,30,89,202 'equal':134 'exact':217 'expect':226 'field':218 'finance/web3':69 'four':204 'gate':3,17 'given':136 'handl':99 'header':111 'id':41 'includ':106 'infer':68 'inform':187 'instant':164 'json':96 'json-response' 'key':159 'limit':162 'list':200 'lowpaymentfee' 'lowpaymentfee.com':32 'maxamountrequir':122 'must':105 'network':86 'no-api-key' 'offer':55 'page':167 'part':49 'pay':9,23,60 'pay-per-call API' 'pay-per-request':59 'payment':97,110,115,142 'paywal':46 'per':13,27,61,78 'platform':53,155 'point':212 'post':92,227 'price':75,211 'proof':116 'protocol':103 'provid':33 'rate':161 'receipt':5,19,36,222 'receipt endpoint' 'remain':229 'request':14,28,62,93 'request/response':189 'requir':177 'resolv':173 'resourc':37 'respons':223 'return':95,219 'schema':186 'second':153 'sent':144 'servic':73 'settl':80 'site':199 'span':64 'specif':38,88 'timeout':150 'transact':4,18,35,40 'transaction receipt API' 'transaction-receipt' 'unit':127 'unknown':230 'usdc':12,26,82,129,137 'usdc-settlement' 'util':72 'valid':114 'varieti':57 'via':100 'view':182 'wallet':179 'without':213 'x':109 'x-payment':108 'x402':2,16,45,102,118 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ad5ddb0c-2a16-42bc-8f7a-914f88505349","listingId":"773626d8-8f61-4c8f-8bfa-a234b7d2bdbb","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/75/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":"2026-04-18T19:27:07.048Z"}],"sources":[{"listingId":"773626d8-8f61-4c8f-8bfa-a234b7d2bdbb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/75/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:07.048Z","lastSeenAt":"2026-04-24T00:32:40.248Z"}],"details":{"listingId":"773626d8-8f61-4c8f-8bfa-a234b7d2bdbb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/75/receipt \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/75/receipt"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages resolve but display only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 75 via a single micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Programmatic access to financial transaction data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need on-demand transaction receipts without subscription overhead","Low-volume, pay-as-you-go API consumption on Base"],"notFor":["High-volume batch retrieval of many transaction receipts (no bulk pricing disclosed)","Users who need detailed API documentation before integrating (docs require wallet connection)","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.98Z"},"updatedAt":"2026-04-24T00:32:40.248Z"}}