{"id":"d4bd2f96-6b7f-40a3-bcc5-f769340ec704","shortId":"wpXgXX","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/102/receipt` returns a JSON receipt when a valid USDC micropayment is made on the Base network. The x402 challenge confirms the endpoint is live, accepting POST requests with an exact payment scheme.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call 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, settled in USDC on the Base network. The platform emphasizes no API keys, no rate limits, and instant access.\n\nDocumentation 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 example payloads available. The x402 challenge for this specific endpoint shows a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02. The payTo address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the asset contract is the canonical Base USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).","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","USDC pay-per-call","Base network API","lowpaymentfee","receipt endpoint","crypto payment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific endpoint path (/transactions/102/receipt) suggests a hardcoded resource; unclear if other transaction IDs are supported","Purpose and contents of the 'receipt' response are undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/102/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/102/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is zero documentation on request parameters, response schema, or what data the receipt actually contains. All doc pages return only 'Connect wallet' with no technical content. No OpenAPI spec is 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'/api/v1/transactions/102/receipt':46 '/docs':157 '/pricing':159 '/readme':161 '0.02':10,24,130,209 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':214 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':224 '20000':200 '6':205 'Base network API' 'USDC pay-per-call' 'accept':70 'access':151 'address':212 'advertis':82 'ai':99 'analysi':103 'analyt':93 'api':90,144 'asset':217 'avail':188 'base':8,22,60,138,201,222 'base-network' 'broader':79 'call':89 'canon':221 'challeng':64,191 'classif':106 'confirm':65 'connect':167 'contract':218 'convers':123 'crypto payment API' 'data':92,96 'decim':206 'detail':174 'document':152,183 'embed':107 'emphas':142 'endpoint':6,20,30,67,126,195 'equal':208 'estim':117 'exact':75 'exampl':186 'exchang':112 'export':97 'extrem':154 'feed':111 'financ':108 'gas':116 'gate':3,17 'generat':124 'geocod':121 'infrastructur':119 'insight':98 'instant':150 'json':49 'json-response' 'key':145 'learn':101 'limit':148 'list':128 'live':69 'lowpaymentfee' 'lowpaymentfee.com':32,80 'machin':100 'made':57 'maxamountrequir':198 'metric':94 'micropay':55 'network':61,139 'no-api-key' 'openapi':178 'page':162 'path':45 'pay':9,23,87 'pay-per-cal':86 'pay-per-call' 'payload':187 'payment':41,76 'payto':211 'per':13,27,88,131 'platform':81,141 'post':71 'price':110 'prompt':169 'protocol':42 'provid':33 'quot':115 'rate':113,147 'receipt':5,19,36,50 'receipt endpoint' 'render':164 'report':95 'request':14,28,72,132 'request/response':181 'resourc':37 'return':47 'schema':182 'scheme':77 'sentiment':102 'settl':133 'show':196 'span':91 'spars':155 'spec':179 'specif':44,194 'suit':84 'summar':105 'technic':173 'text':104 'token':114 'transact':4,18,35 'transaction receipt API' 'transaction-receipt' 'unit':202 'usdc':12,26,54,135,204,223 'usdc-micropayment' 'util':120 'valid':53,122 'via':38 'wallet':168 'web3':109 'x402':2,16,40,63,190 'x402 micropayment' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"f2e32710-eaa2-4904-a5b6-1e25844ef682","listingId":"d4bd2f96-6b7f-40a3-bcc5-f769340ec704","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/102/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":"2026-04-18T18:58:15.545Z"}],"sources":[{"listingId":"d4bd2f96-6b7f-40a3-bcc5-f769340ec704","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/102/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:15.545Z","lastSeenAt":"2026-04-25T03:03:30.042Z"}],"details":{"listingId":"d4bd2f96-6b7f-40a3-bcc5-f769340ec704","quickStartSnippet":"# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/102/receipt\n# 2. Parse the 402 response, construct an X-PAYMENT header with a signed USDC payment of 20000 base units ($0.02) on Base, then resend:\ncurl -X POST -H \"X-PAYMENT: <signed_payment_token>\" https://lowpaymentfee.com/api/v1/transactions/102/receipt","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/102/receipt"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/102/receipt"},{"claim":"Platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction ID 102 via micropayment","Programmatic access to receipts without API key registration","Agent-driven payment-gated data retrieval on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need pay-per-call access without pre-registration","Use cases requiring USDC micropayments on Base L2"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based API access","High-volume batch retrieval where per-call pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.548Z"},"updatedAt":"2026-04-25T03:03:30.042Z"}}