{"id":"aa3ad888-05bd-4dbe-8b2c-89f3d6097e10","shortId":"CR4QdN","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 (specifically for transaction ID 110) 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 utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/110/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 x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /api, /README) all resolve but appear to require a wallet connection to view content, so detailed API schemas and response formats are not available from the crawl. The exact content returned by this receipt endpoint is unclear — the description simply says \"Premium API Access\" — so the actual payload structure must be discovered by making a paid request.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all require wallet connection and returned no useful content during crawl.","The exact response schema and payload of this receipt endpoint are unknown — 'Premium API Access' is the only description provided.","This endpoint is for a specific transaction ID (110); it is unclear whether other transaction IDs are available or what the receipt contains.","The broader platform lists many API categories (AI, analytics, finance, utilities) but none could be verified from crawl content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/110/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/110/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no response examples, and all documentation pages require wallet connection, yielding no usable content. The purpose of this specific receipt endpoint is vague — 'Premium API Access' is not descriptive. Effectively a stub 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'/api/v1/transactions/110/receipt':91 '/docs':170 '/pricing':171 '/readme':173 '0.02':10,24,77,138 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':132 '110':42 '20':125 '2913':133 '300':153 '6':142 'Base network API' 'USDC micropayment API' 'accept':92 'access':167,215 'actual':218 'address':149 'advertis':121,158 'ai/ml':67 'analyt':66 'api':63,160,188,214 'appear':177 'avail':195 'base':8,22,86,127,135 'base-network' 'behind':43 'broader':52 'call':62 'caller':105 'challeng':120 'connect':182 'content':185,201 'contract':131 'crawl':198 'data':65,70 'decim':143 'descript':210 'detail':187 'discov':223 'document':168 'endpoint':6,20,30,90,206 'equal':137 'exact':200 'finance/web3':69 'format':192 'gate':3,17 'given':139 'handl':100 'header':112 'id':41 'includ':107 'infer':68 'instant':166 'json':97 'json-response' 'key':161 'limit':164 'lowpaymentfee' 'lowpaymentfee.com':32 'make':225 'maxamountrequir':123 'must':106,221 'network':87 'no-api-key' 'offer':55 'page':169 'paid':227 'part':49 'pay':9,23,60 'pay-per-cal':59 'pay-per-call' 'pay-per-request API' 'payload':219 'payment':98,111,116,145 'paywal':46 'per':13,27,61,78 'platform':53,157 'post':93 'premium':213 'price':75 'proof':117 'protocol':104 'provid':33 'rate':163 'receipt':5,19,36,205 'request':14,28,79,94,228 'requir':179 'resolv':175 'resourc':37 'respons':191 'return':96,202 'say':212 'schema':189 'second':154 'sent':147 'servic':73 'settl':81 'simpli':211 'span':64 'specif':38,89 'structur':220 'timeout':155 'transact':4,18,35,40 'transaction receipt API' 'transaction-receipt' 'unclear':208 'unit':128 'usdc':12,26,83,130,140 'usdc-settlement' 'util':72 'valid':115 'varieti':57 'via':101 'view':184 'wallet':181 'x':110 'x-payment':109 'x402':2,16,45,103,119 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"09402580-11c1-40f7-8f89-5f8c9ce880bf","listingId":"aa3ad888-05bd-4dbe-8b2c-89f3d6097e10","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/110/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":"2026-04-18T18:58:13.714Z"}],"sources":[{"listingId":"aa3ad888-05bd-4dbe-8b2c-89f3d6097e10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/110/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:13.714Z","lastSeenAt":"2026-04-25T03:03:30.065Z"}],"details":{"listingId":"aa3ad888-05bd-4dbe-8b2c-89f3d6097e10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/110/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 returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/110/receipt"},{"claim":"Platform advertises $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 lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving a transaction receipt for transaction 110 via a micropayment","Demonstrating x402 protocol integration for agent-to-agent payments","Accessing premium data behind a crypto paywall without API key management"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can autonomously settle USDC micropayments","Use cases requiring keyless, pay-per-call API access"],"notFor":["Users who need detailed API documentation before purchasing","High-volume batch retrieval where $0.02/request adds up quickly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.548Z"},"updatedAt":"2026-04-25T03:03:30.065Z"}}