{"id":"41f00baf-9275-4ccb-8989-6f9e12a5772c","shortId":"9G4U2L","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific transaction receipt (transaction ID 262) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint probed (/api/v1/transactions/262/receipt) returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. Payment is made via the x402 \"exact\" scheme, with a 300-second timeout. No API keys or rate limits are advertised — access is granted purely through on-chain micropayment.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The platform's landing page lists many endpoints but provides no detail on request parameters or response formats for any of them.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-micropayment","transaction-receipt","no-api-key","pay-per-use"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","402 payment required API","crypto micropayment endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint on the platform","The endpoint is for a specific transaction ID (262); unclear if this is a general-purpose receipt endpoint or a fixed resource","Response format and fields are completely unknown","The platform lists many endpoints on its landing page but none have documented request/response contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/262/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/262/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 challenge, confirming it is operational. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet' with no content. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of this particular receipt endpoint (transaction 262) is unclear. The listing is effectively a 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'/api/v1/transactions/262/receipt':110 '/docs':175 '/pricing':177 '/readme':179 '0.02':92,137 '000':121 '0x8335':126 '20':120 '262':42 '2913':127 '300':150 '402 payment required API' '6':133 'Base network API' 'USDC pay-per-call' 'access':34,161 'actual':209 'advertis':51,160 'ai/ml':63 'analysi':66 'analyt':62 'api':59,154 'base':8,22,100,122,129 'behind':43 'broader':48 'call':12,26,139 'chain':168 'challeng':115 'classif':68 'connect':185 'contain':210 'content':191 'convers':85 'crypto micropayment endpoint' 'data':61,71 'decim':134 'detail':222 'document':170,200 'embed':69 'endpoint':6,20,30,88,108,218 'equal':136 'estim':79 'exact':146 'exampl':203 'exchang':74 'extrem':172 'feed':73 'finance/web3':70 'format':228 'gas':78 'gate':3,17 'generat':86 'geocod':83 'grant':163 'id':41 'infer':64 'infrastructur':81 'key':155 'land':214 'limit':158 'list':216 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':142 'mani':217 'maxamountrequir':118 'micropay':169 'network':101 'no-api-key' 'on-chain':166 'openapi':195 'page':180,215 'paid':9,23 'paramet':225 'pay':56 'pay-per-request':55 'pay-per-use' 'payload':208 'payment':140 'paywal':46 'per':11,25,57,93,138 'per-cal':10,24 'per-call-micropayment' 'platform':50,212 'price':72,90 'probe':109 'prompt':187 'protocol':105 'provid':33,220 'pure':164 'quot':77 'rate':75,157 'receipt':5,19,39,207 'render':182 'request':58,94,224 'request/response':198 'respons':227 'return':111 'schema':199 'scheme':147 'second':151 'sentiment':65 'settl':95 'sinc':130 'span':60 'spars':173 'spec':196 'specif':37,107 'substant':190 'suit':53 'summar':67 'timeout':152 'token':76 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'unit':123 'usdc':14,28,97,125,131 'usdc-base' 'use':132 'util':82 'valid':84,113 'via':102,143 'wallet':186 'x402':2,16,45,104,114,145 'x402 micropayment' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"4383f4ce-d279-4684-9b9d-bb2ff30f1525","listingId":"41f00baf-9275-4ccb-8989-6f9e12a5772c","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/262/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":"2026-04-18T18:59:39.011Z"}],"sources":[{"listingId":"41f00baf-9275-4ccb-8989-6f9e12a5772c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/262/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:39.011Z","lastSeenAt":"2026-04-24T14:33:33.595Z"}],"details":{"listingId":"41f00baf-9275-4ccb-8989-6f9e12a5772c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/262/receipt \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/262/receipt"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/262/receipt"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 262 via micropayment","Demonstrating x402 protocol integration for pay-per-call APIs","Programmatic access to transaction data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC micropayments on Base","Use cases needing keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume batch retrieval where per-call pricing is inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.666Z"},"updatedAt":"2026-04-24T14:33:33.595Z"}}