{"id":"25a4ec21-ed83-4147-b7eb-5299743348ee","shortId":"TN9mrv","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 via the x402 payment protocol. The specific path `/api/v1/transactions/22/receipt` returns a receipt for transaction ID 22 in JSON format, gated behind a per-request USDC micropayment on the Base network.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-protected 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 a uniform $0.02 per request, paid in USDC on Base. The platform emphasizes no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe probed endpoint returns a valid x402 challenge (HTTP 402) with `maxAmountRequired` of 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. The payment scheme is \"exact\" with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","json-response","per-request-billing"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No OpenAPI or schema documentation available; response format is unknown beyond mimeType application/json.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no substantive content.","The endpoint path is hardcoded to transaction ID 22; it is unclear whether other transaction IDs are supported or what data the receipt contains.","The broader platform lists many API categories (AI, finance, analytics, infrastructure) but none could be verified beyond their listing on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/22/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/22/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 and returns a valid x402 challenge, but there is no OpenAPI schema, no example responses, and no meaningful documentation — all doc pages render only a wallet-connect prompt. The specific endpoint path (/transactions/22/receipt) is hardcoded to a single transaction ID, and its utility beyond a demo is 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'0.02':10,24,122,177 '0x8335':170 '20000':165 '22':53 '300':185 '402':161 '402 payment required' '6':173 'Base network API' 'USDC pay-per-call' 'access':141 'advertis':73 'ai':89 'analysi':93 'analyt':83 'api':80,134,204 'attach':144 'base':8,22,67,129,166,172 'base-network' 'behind':58 'broader':70 'caller':142 'challeng':159 'classif':96 'connect':212 'content':218 'convers':113 'crawl':200 'crypto payment API' 'data':82,86 'decim':174 'detail':191 'doc':202 'document':192 'embed':97 'emphas':132 'endpoint':6,20,30,116,154 'equal':176 'estim':107 'exact':182 'exampl':194 'exchang':102 'export':87 'feed':101 'financ':98 'format':56 'found':197 'gas':106 'gate':3,17,57 'generat':114 'geocod':111 'header':148 'http':160 'id':52 'infrastructur':109 'insight':88 'instant':140 'json':55 'json-response' 'key':135 'learn':91 'limit':138 'list':118 'lowpaymentfee' 'lowpaymentfee.com':32,71 'machin':90 'maxamountrequir':163 'metric':84 'micropay':64 'network':68 'openapi':189 'page':207 'paid':125 'path':45 'pay':9,23 'payment':41,147,179 'per':13,27,61,123 'per-request':60 'per-request-billing' 'platform':72,131 'price':100,203 'probe':153 'prompt':214 'protect':79 'protocol':42 'provid':33 'quot':105 'rate':103,137 'readm':206 'receipt':5,19,36,49 'render':209 'report':85 'request':14,28,62,124,151 'resourc':37 'respons':195 'return':47,155 'schema':190 'scheme':180 'second':186 'sentiment':92 'simpli':143 'span':81 'specif':44 'substant':217 'suit':75 'summar':95 'text':94 'timeout':187 'token':104 'transact':4,18,35,51 'transaction receipt API' 'transaction-receipt' 'uniform':121 'unit':167 'usdc':12,26,63,127,169 'usdc-micropayment' 'util':110 'valid':112,157 'via':38 'wallet':213 'web3':99 'x402':2,16,40,78,146,158 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protected':77","prices":[{"id":"b5caeb56-c5ea-4aaf-9708-3a595b298c31","listingId":"25a4ec21-ed83-4147-b7eb-5299743348ee","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/22/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":"2026-04-18T18:59:15.057Z"}],"sources":[{"listingId":"25a4ec21-ed83-4147-b7eb-5299743348ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/22/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:15.057Z","lastSeenAt":"2026-04-24T18:33:04.781Z"}],"details":{"listingId":"25a4ec21-ed83-4147-b7eb-5299743348ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/22/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof on Base to access the receipt.","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/22/receipt"},{"claim":"All endpoints are listed 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 advertises APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/22/receipt"}],"useCases":["Retrieving a transaction receipt for a specific transaction ID via micropayment","Demonstrating x402 protocol integration for pay-per-call APIs","Programmatic access to receipt data without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing pay-per-call receipt retrieval without signup","Low-volume, on-demand transaction receipt lookups"],"notFor":["Bulk or high-volume receipt retrieval (no documented batch support)","Users who need detailed API documentation or response schema guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.818Z"},"updatedAt":"2026-04-24T18:33:04.781Z"}}