{"id":"6e58ad69-fab9-482c-b511-bf7f1a3418cf","shortId":"VbwQRx","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 behind an x402 paywall. The specific path `/api/v1/transactions/28/receipt` returns a JSON receipt for transaction #28 when the caller supplies a valid X-PAYMENT header with USDC on the Base network. The cost is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol on the Base L2 network using USDC.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response payload structure is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","transaction-receipt","per-request-billing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific endpoint path is hardcoded to transaction ID 28; unclear if other IDs are available or what the receipt contains","Response payload structure is completely unknown","The platform lists many API categories (AI, analytics, finance, utilities) but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/28/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/28/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, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific endpoint path (/transactions/28/receipt) is hardcoded to a single transaction ID with no explanation of what it returns. The broader platform lists many endpoints but none are documented beyond a name and 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'/api/v1/transactions/28/receipt':45 '/docs':170 '/pricing':171 '/readme':174 '0.02':10,24,82,136 '000':73 '20':72 '28':52 '402':214 '6':78 'Base network API' 'USDC micropayment API' 'actual':218 'advertis':89 'ai':105 'analysi':109 'analyt':99 'api':96,141 'avail':201 'base':8,22,67,74,160 'behind':38 'broader':86 'caller':55 'challeng':215 'classif':112 'commit':148 'confirm':209 'connect':180 'content':205 'convers':129 'cost':70 'crawl':204 'data':98,102 'decim':79 'detail':187 'document':165,196 'embed':113 'endpoint':6,20,30,132,207 'entir':153 'equal':81 'estim':123 'exampl':200 'exchang':118 'export':103 'extrem':167 'feed':117 'financ':114 'gas':122 'gate':3,17,95 'generat':130 'geocod':127 'handl':152 'header':62 'infrastructur':125 'insight':104 'json':48 'json-response' 'key':142 'l2':161 'learn':107 'limit':145 'list':134 'live':210 'lowpaymentfee' 'lowpaymentfee.com':32,87 'machin':106 'metric':100 'network':68,162 'no-api-key' 'openapi':191 'page':175 'path':44 'pay':9,23 'pay-per-call API' 'payload':220 'payment':61,150 'paywal':41 'per':13,27,83,137 'per-request-billing' 'platform':88 'price':116 'prompt':182 'proper':213 'protocol':157 'provid':33 'quot':121 'rate':119,144 'receipt':5,19,36,49 'render':177 'report':101 'request':14,28,84,138 'request/response':194 'requir':149 'resourc':37 'respons':219 'return':46,211 'schema':195 'sentiment':108 'span':97 'spars':168 'spec':192 'specif':43 'structur':221 'suit':91 'summar':111 'suppli':56 'technic':186 'text':110 'token':120 'transact':4,18,35,51 'transaction receipt API' 'transaction-receipt' 'unit':75 'unknown':223 'usag':199 'usdc':12,26,64,77,164 'usdc-base' 'use':163 'util':126 'valid':58,128 'via':154 'wallet':181 'web3':115 'x':60 'x-payment':59 'x402':2,16,40,94,156 'x402 payment endpoint' 'x402-gated':1,15,93 'x402-payment'","prices":[{"id":"cd1c54ca-4c52-4396-9233-142cb015874f","listingId":"6e58ad69-fab9-482c-b511-bf7f1a3418cf","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/28/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":"2026-04-18T18:59:50.091Z"}],"sources":[{"listingId":"6e58ad69-fab9-482c-b511-bf7f1a3418cf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/28/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:50.091Z","lastSeenAt":"2026-04-24T13:32:37.057Z"}],"details":{"listingId":"6e58ad69-fab9-482c-b511-bf7f1a3418cf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/28/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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/28/receipt"},{"claim":"All endpoints are 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":"The platform lists APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/28/receipt"}],"useCases":["Retrieving a transaction receipt for transaction #28 via programmatic x402 payment","Demonstrating x402 protocol integration with USDC on Base","Agent-driven pay-per-call access to financial transaction data"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need pay-per-call access without API key management","Low-cost micro-transaction receipt retrieval on Base"],"notFor":["Production workloads requiring documented request/response schemas","Bulk transaction receipt retrieval (single fixed transaction ID in path)","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.127Z"},"updatedAt":"2026-04-24T13:32:37.057Z"}}