{"id":"69a5dd82-24c9-4ca4-8347-77031ed1e9b0","shortId":"2txAKX","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 access to a specific transaction receipt (transaction ID 246) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint probed (/api/v1/transactions/246/receipt) is live and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are required; access is granted purely through x402 payment headers.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage deployment of x402-gated microservices.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","transaction-receipt","pay-per-request","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto payment gateway"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The endpoint is for a specific transaction ID (246) — unclear if this is parameterized or a fixed resource","No response schema or example output is documented anywhere","Platform may be a demo or early-stage deployment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/246/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/246/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 and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no examples of the actual payload. The specific endpoint (transaction 246 receipt) is narrow and unexplained. Effectively a stub 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'/api/v1/transactions/246/receipt':111 '/docs':188 '/pricing':190 '/readme':192 '0.02':93,142 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':161 '0x8335':130 '20':124 '246':42 '2913':131 '300':164 '6':137 'Base network API' 'USDC micropayment API' 'access':34,175 'actual':222 'address':160 'advertis':51,150 'ai/ml':63 'analysi':66 'analyt':62 'api':59,168 'appear':226 'base':8,22,101,126,133 'behind':43 'broader':48 'call':12,26,144 'challeng':119 'classif':68 'connect':198 'consist':145 'contain':223 'content':204 'convers':86 'crypto payment gateway' 'data':61,72 'decim':138 'demonstr':230 'deploy':235 'document':183,213 'earli':233 'early-stag':232 'embed':69 'endpoint':6,20,30,89,109 'estim':80 'exact':157 'exampl':216 'exchang':75 'extrem':185 'feed':74 'financ':70 'gas':79 'gate':3,17,239 'generat':87 'geocod':84 'grant':177 'header':182 'id':41 'infer':64 'infrastructur':82 'json-response' 'key':169 'limit':172 'live':113 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':154 'maxamountrequir':122 'microservic':240 'network':102 'no-api-key' 'openapi':208 'page':193 'paid':9,23 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':221 'payment':152,181 'paywal':46 'per':11,25,57,94,143 'per-cal':10,24 'per-call-pricing' 'platform':50,225 'price':73,91,151 'probe':110 'prompt':200 'protocol':106 'provid':33 'pure':178 'quot':78 'rate':76,171 'receipt':5,19,39,220 'render':195 'request':58,95 'request/response':211 'requir':174 'return':115 'schema':212 'scheme':158 'second':165 'sentiment':65 'settl':96 'sinc':134 'site':148 'span':60 'spars':186 'spec':209 'specif':37,108 'stage':234 'suit':53 'summar':67 'timeout':166 'token':77 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'translat':140 'unit':127 'usdc':14,28,98,129,135 'usdc-base' 'use':136 'util':83 'valid':85,117 'via':103,155 'wallet':199 'web3':71 'x402':2,16,45,105,118,180,238 'x402 paid endpoint' 'x402-gated':1,15,237 'x402-payment'","prices":[{"id":"30a42447-ab71-4d93-8ce8-a6232f234d44","listingId":"69a5dd82-24c9-4ca4-8347-77031ed1e9b0","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/246/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":"2026-04-18T18:59:26.454Z"}],"sources":[{"listingId":"69a5dd82-24c9-4ca4-8347-77031ed1e9b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/246/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:26.454Z","lastSeenAt":"2026-04-24T16:03:18.120Z"}],"details":{"listingId":"69a5dd82-24c9-4ca4-8347-77031ed1e9b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/246/receipt\n# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment to receive the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/246/receipt"},{"claim":"Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving transaction receipt data for transaction ID 246 via a single paid API call","Demonstrating x402 protocol integration for agent-purchasable endpoints","Testing micropayment flows on the Base network using USDC"],"bestFor":["Developers experimenting with x402 payment protocol integration","Agents needing pay-per-call access without API key management","Projects requiring USDC-settled micropayment API access on Base"],"notFor":["Production workloads requiring documented schemas and SLAs","Bulk data retrieval where per-call pricing is cost-inefficient","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.346Z"},"updatedAt":"2026-04-24T16:03:18.120Z"}}