{"id":"f6137163-f679-4bcb-bfce-34eda77b884c","shortId":"VwjJRW","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 168) behind an x402 paywall. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, 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/168/receipt` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. No API keys or rate limits are advertised; access is purely gated by micropayment.\n\nDocumentation on the site is extremely thin — the docs, pricing, API, 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 usage examples. The platform lists many other endpoints (analytics, AI, finance, utils) at the same $0.02 price point, but details about what data this particular receipt endpoint returns are not documented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","USDC pay-per-call","Base network API","lowpaymentfee","402 payment required API","crypto micropayment API"],"warnings":["No OpenAPI spec or schema documentation available","Docs, pricing, API, and README pages all render only 'Connect wallet' with no substantive content","No request body schema or response schema documented — callers cannot know what to send or expect back","The endpoint path references a specific transaction ID (168); unclear if this is a generic pattern or a single fixed resource","Platform lists many endpoints but none appear to have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/168/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/168/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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The docs pages all render only 'Connect wallet' with no content. The specific purpose of this receipt endpoint is 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'0.02':10,24,75,134,215 '000':123 '0x8335':128 '168':40 '20':122 '2913':129 '300':147 '402 payment required API' '6':138 'Base network API' 'USDC pay-per-call' 'accept':90 'access':158 'advertis':118,157 'ai':209 'ai/ml':65 'analyt':64,208 'api':61,151,174 'base':8,22,84,124,131 'base-network' 'behind':41 'broader':50 'call':60 'caller':103 'challeng':117 'connect':182 'content':188 'crypto micropayment API' 'data':63,68,222 'decim':139 'detail':219 'doc':172 'document':164,197,230 'endpoint':6,20,30,88,207,226 'equal':133 'exact':144 'exampl':201 'extrem':169 'financ':210 'finance/web3':67 'gate':3,17,161 'given':135 'handl':98 'header':110 'id':39 'includ':105 'infer':66 'infrastructur':70 'json':95 'json-response' 'key':152 'limit':155 'list':204 'lowpaymentfee' 'lowpaymentfee.com':32 'mani':205 'maxamountrequir':120 'micropay':163 'must':104 'network':85 'no-api-key' 'offer':53 'openapi':192 'page':177 'part':47 'particular':224 'pay':9,23,58 'pay-per-cal':57 'pay-per-call' 'payment':96,109,114,141 'paywal':44 'per':13,27,59,76 'platform':51,203 'point':217 'post':91 'price':73,173,216 'prompt':184 'proof':115 'protocol':102 'provid':33 'pure':160 'rate':154 'readm':176 'receipt':5,19,36,225 'render':179 'request':14,28,77,92 'request/response':195 'resourc':37 'return':94,227 'schema':196 'scheme':142 'second':148 'settl':79 'site':167 'span':62 'spec':193 'specif':87 'substant':187 'thin':170 'timeout':149 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':125 'usag':200 'usdc':12,26,81,127,136 'usdc-micropayment' 'util':71,211 'valid':113 'varieti':55 'via':99 'wallet':183 'x':108 'x-payment':107 'x402':2,16,43,101 'x402 micropayment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"acb804ea-2345-426b-a336-b379b99fdfc6","listingId":"f6137163-f679-4bcb-bfce-34eda77b884c","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/168/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":"2026-04-18T18:58:50.965Z"}],"sources":[{"listingId":"f6137163-f679-4bcb-bfce-34eda77b884c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/168/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:50.965Z","lastSeenAt":"2026-04-24T21:32:28.733Z"}],"details":{"listingId":"f6137163-f679-4bcb-bfce-34eda77b884c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/168/receipt \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/168/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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 168 via micropayment","Demonstrating x402 protocol integration for pay-per-call APIs","Agent-driven data retrieval without API key management"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need keyless, pay-per-call API access on Base","Projects requiring USDC-settled micropayment API patterns"],"notFor":["Production use cases requiring documented request/response schemas","Bulk or high-volume data retrieval (no batch endpoints documented)","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.929Z"},"updatedAt":"2026-04-24T21:32:28.733Z"}}