{"id":"c4668887-4bea-40df-9694-0594f40aaf4a","shortId":"asbxFU","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 (transaction ID 209) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per call and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/209/receipt` accepts POST requests and returns an `application/json` response. Payment is handled via the x402 protocol: callers receive a 402 challenge containing the payment terms (asset, amount, payTo address), construct an on-chain USDC payment on Base, and include the payment proof in the `X-PAYMENT` header to unlock the response. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys, rate limits, or subscriptions are needed — access is purely pay-per-request.\n\nThe platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more, all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse — the docs, API, pricing, 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 material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","transaction-receipt","json-response","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","402 payment required"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific data returned by /api/v1/transactions/209/receipt is undocumented — unclear what 'transaction 209' refers to","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/209/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/209/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 with clear pricing. However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs/pricing/API pages are all blank beyond a wallet connect prompt. The specific purpose of this particular receipt endpoint is unclear beyond its URL 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'0.02':10,24,75,157,198 '000':148 '20':147 '209':40 '402':108 '402 payment required' '6':153 'Base network API' 'USDC micropayment API' 'accept':90 'access':167 'addit':177 'address':117 'advertis':176 'ai/ml':65 'amount':115,144 'analysi':181 'analyt':64 'api':61,159,212 'application/json':96 'asset':114 'avail':242 'base':8,22,84,126,149 'behind':41 'beyond':203 'broader':50 'call':77 'caller':105 'chain':122 'challeng':109 'classif':184 'connect':221 'construct':118 'contain':110 'crawl':245 'data':63,68 'decim':154 'detail':228 'doc':211 'document':202,237 'embed':185 'endpoint':6,20,30,88,178 'equal':156 'exampl':241 'exchang':188 'extrem':208 'feed':187 'finance/web3':67 'gate':3,17 'geocod':190 'handl':100 'header':137 'howev':201 'id':39 'includ':128 'infer':66 'infrastructur':70 'json-response' 'key':160 'land':205 'limit':162 'lowpaymentfee' 'lowpaymentfee.com':32 'materi':246 'max':143 'need':166 'network':85 'no-api-key' 'offer':53 'on-chain':120 'openapi':232 'page':206,216 'part':47 'pay':9,23,58,171 'pay-per-call API' 'pay-per-request':57,170 'payment':98,112,124,130,136 'payto':116 'paywal':44 'per':13,27,59,76,172 'platform':51,175 'point':200 'post':91 'post-method' 'price':73,186,199,213 'prompt':223 'proof':131 'protocol':104 'provid':33 'pure':169 'rate':161,189 'readm':215 'receipt':5,19,36 'receiv':106 'render':218 'request':14,28,60,92,173 'request/response':235 'requir':145 'resourc':37 'respons':97,141 'return':94 'schema':236 'sentiment':180 'settl':79 'span':62 'spars':209 'spec':233 'specif':87 'subscript':164 'summar':183 'technic':227 'term':113 'text':182 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':150 'unlock':139 'usag':240 'usdc':12,26,81,123,152 'usdc-base' 'util':71 'valid':191 'varieti':55 'via':101 'wallet':222 'x':135 'x-payment':134 'x402':2,16,43,103 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"62a20d3e-8b42-4b27-b5d5-4e26c750103a","listingId":"c4668887-4bea-40df-9694-0594f40aaf4a","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/209/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":"2026-04-18T18:59:17.512Z"}],"sources":[{"listingId":"c4668887-4bea-40df-9694-0594f40aaf4a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/209/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:17.512Z","lastSeenAt":"2026-04-24T17:03:04.483Z"}],"details":{"listingId":"c4668887-4bea-40df-9694-0594f40aaf4a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/209/receipt\n# Returns 402 with x402 challenge. Include X-PAYMENT header with USDC payment proof on Base to unlock the receipt.","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","source_url":"https://lowpaymentfee.com/api/v1/transactions/209/receipt"},{"claim":"All APIs 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 offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/209/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 209 via a single micropayment","Demonstrating x402 protocol integration for pay-per-request APIs","Programmatic access to receipts without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","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 micropayments add up","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.733Z"},"updatedAt":"2026-04-24T17:03:04.483Z"}}