{"id":"78b2ef01-9445-42e8-a72b-0c9d63e28a07","shortId":"THB6Fz","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 294) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/294/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 asset used is USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment timeout is 300 seconds.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so there is no detailed schema, request/response format, or usage guidance available. The endpoint is live and returns a proper 402 challenge, but the actual functionality and response payload for this specific receipt endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment endpoint"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty beyond 'Connect wallet'","No OpenAPI or schema available — request body and response format are unknown","Endpoint is scoped to a single transaction ID (294); unclear if other IDs are available","No information on what data the 'receipt' actually contains"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/294/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/294/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, but documentation is effectively nonexistent — all doc/pricing/API pages render only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the endpoint appears to serve a single hardcoded transaction ID (294) with no explanation of what the receipt contains. This is essentially a stub 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'0.02':10,24,77,138 '000':133 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':124 '20':132 '294':42 '300':147 '402':198 '6':141 'Base network API' 'USDC micropayment API' 'accept':92 'access':160 'actual':202 'advertis':151 'ai/ml':67 'amount':130 'analyt':66 'api':63,153 'asset':119 'avail':189 'base':8,22,86,126,134 'base-network' 'behind':43 'beyond':163 'broader':52 'call':62 'caller':105 'challeng':199 'connect':176 'contract':123 'crypto payment endpoint' 'data':65,70 'decim':142 'detail':182 'document':162 'empti':169 'endpoint':6,20,30,90,191,211 'equal':137 'essenti':168 'finance/web3':69 'format':185 'function':203 'gate':3,17 'guidanc':188 'handl':100 'header':112 'howev':161 'id':41 'includ':107 'infer':68 'instant':159 'json':97 'json-response' 'key':154 'land':165 'limit':157 'live':193 'lowpaymentfee' 'lowpaymentfee.com':32 'max':129 'must':106 'network':87 'no-api-key' 'offer':55 'page':166,173 'part':49 'pay':9,23,60 'pay-per-cal':59 'pay-per-call' 'pay-per-request API' 'payload':206 'payment':98,111,116,144 'paywal':46 'per':13,27,61,78 'platform':53,150 'post':93 'price':75 'proof':117 'proper':197 'protocol':104 'provid':33 'rate':156 'receipt':5,19,36,210 'remain':212 'request':14,28,79,94 'request/response':184 'resourc':37 'respons':205 'return':96,195 'schema':183 'second':148 'servic':73 'settl':81 'show':175 'span':64 'specif':38,89,209 'sub':172 'sub-pag':171 'timeout':145 'transact':4,18,35,40 'transaction receipt API' 'transaction-receipt' 'undocu':213 'unit':135 'usag':187 'usdc':12,26,83,122,139 'usdc-settlement' 'use':120,140 'util':72 'valid':115 'varieti':57 'via':101 'wallet':177 'x':110 'x-payment':109 'x402':2,16,45,103 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f81b3f0d-8d21-41cd-a67e-22f56b0df691","listingId":"78b2ef01-9445-42e8-a72b-0c9d63e28a07","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/294/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":"2026-04-18T18:59:48.865Z"}],"sources":[{"listingId":"78b2ef01-9445-42e8-a72b-0c9d63e28a07","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/294/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:48.865Z","lastSeenAt":"2026-04-24T13:03:15.513Z"}],"details":{"listingId":"78b2ef01-9445-42e8-a72b-0c9d63e28a07","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/294/receipt \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/294/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/294/receipt"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 294 via a single micropayment","Demonstrating x402 protocol integration for pay-per-call APIs","Programmatic access to receipt data without API key registration"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base","Use cases requiring keyless, pay-per-call API access"],"notFor":["Production workflows requiring documented request/response schemas","Bulk retrieval of multiple transaction receipts (only one transaction ID exposed)","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.201Z"},"updatedAt":"2026-04-24T13:03:15.513Z"}}