{"id":"d53977e0-51ca-4a3e-b460-47e2cd511d93","shortId":"X8axHK","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 a transaction receipt resource (transaction ID 39) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/39/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the accepted payment scheme (exact), the USDC asset contract on Base (`0x8335…`), and a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are advertised; access is granted purely through per-request micropayment.\n\nThe platform's landing page lists additional endpoints spanning sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Because of this, the actual data returned by this receipt endpoint and the broader platform's endpoints remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","transaction-receipt","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint on the platform","Docs, pricing, API, and README pages all render only 'Connect wallet' with no content","The specific data returned by /api/v1/transactions/39/receipt is unknown — it may be a demo or placeholder","The broader platform lists many endpoint categories but none could be verified beyond the landing page descriptions"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/39/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/39/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example requests or responses, and the crawled docs/pricing/README pages are all empty beyond a wallet-connect prompt. The purpose of this specific receipt endpoint is 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'0.02':71,127,178 '000':123 '0x8335':116 '20':122 '39':40 '402':102 '6':131 'Base network API' 'USDC pay-per-call' 'accept':86,106 'access':141 'actual':218 'addit':156 'advertis':53,140 'ai':60 'amount':120 'analysi':160 'analyt':59 'api':55,134,198 'application/json':91 'asset':112 'base':8,22,80,115,124 'behind':41 'broader':50,227 'call':12,26 'caller':99 'categori':56 'challeng':103 'classif':163 'connect':207 'contain':104 'content':213 'contract':113 'convers':171 'crawl':195 'data':58,219 'decim':132 'detail':185 'doc':197 'document':186 'embed':164 'endpoint':6,20,30,84,157,224,230 'exact':109 'exampl':188 'exchang':167 'feed':166 'financ':63 'found':192 'gate':3,17 'generat':173 'geocod':169 'given':128 'grant':143 'handl':94 'howev':181 'i.e':126 'id':39 'includ':57 'infrastructur':66 'json-response' 'key':135 'land':153 'learn':62 'limit':138 'list':155 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'maximum':119 'micropay':149 'multipl':54 'network':81 'no-api-key' 'openapi':183 'page':154,202 'paid':9,23 'part':47 'payload':190 'payment':92,107 'paywal':44 'per':11,25,72,147 'per-cal':10,24 'per-request':146 'per-request-micropayment' 'platform':51,151,228 'point':180 'post':87 'price':69,165,179,199 'prompt':209 'protocol':98 'provid':33 'pure':144 'rate':137,168 'readm':201 'receipt':5,19,36,223 'receiv':100 'remain':231 'request':73,88,148 'request/response':189 'resourc':37 'return':90,204,220 'schema':184 'scheme':108 'sentiment':159 'settl':75 'span':158 'specif':83 'substant':212 'summar':162 'text':161 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unclear':232 'unit':125 'usdc':14,28,77,111,129 'usdc-base' 'util':67 'valid':170 'via':95 'wallet':208 'web3':64 'x402':2,16,43,97 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"fe4dc5dd-9131-4f63-83a1-6e9b318c1583","listingId":"d53977e0-51ca-4a3e-b460-47e2cd511d93","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/39/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":"2026-04-18T19:26:44.807Z"}],"sources":[{"listingId":"d53977e0-51ca-4a3e-b460-47e2cd511d93","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/39/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:44.807Z","lastSeenAt":"2026-04-24T04:04:20.106Z"}],"details":{"listingId":"d53977e0-51ca-4a3e-b460-47e2cd511d93","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/39/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment proof to receive the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/39/receipt"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/39/receipt"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 39 via a single micropayment","Demonstrating x402 protocol integration for pay-per-call APIs","Programmatic access to receipt data without API key management"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that can settle USDC payments on Base for per-call access","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume batch retrieval where per-request fees add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.01Z"},"updatedAt":"2026-04-24T04:04:20.106Z"}}