{"id":"1d7646f8-6cb1-4f23-86ef-7e7ff338d491","shortId":"TTQ5Ke","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 a transaction receipt resource (specifically for transaction ID 256) 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 (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 probed endpoint `/api/v1/transactions/256/receipt` returns a valid x402 challenge (HTTP 402) requesting up to 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 x402 \"exact\" scheme with a 300-second timeout. No API keys or rate limits are required — access is purely payment-gated.\n\nDocumentation is extremely thin. 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 usage examples. The actual data returned by this receipt endpoint (or any of the other listed endpoints) is unknown beyond the MIME type `application/json`. The platform appears functional but poorly documented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-pricing","transaction-receipt","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid API","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, /README all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","No response examples or field descriptions available","The specific endpoint is for transaction ID 256 — unclear if this is a demo or a real resource","Platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/256/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/256/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 ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and all documentation pages render only 'Connect wallet'. The specific purpose of this particular receipt endpoint is unclear beyond its URL 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'/api/v1/transactions/256/receipt':110 '/docs':181 '/pricing':183 '/readme':185 '0.02':92,139 '000':122 '0x8335':127 '20':121 '256':42 '2913':128 '300':159 '402':117 '6':134 'Base network API' 'USDC micropayment API' 'access':170 'actual':212 'advertis':51,147 'ai/ml':63 'analysi':66 'analyt':62 'api':59,163 'appear':235 'application/json':232 'base':8,22,100,123,130 'base-network' 'behind':43 'beyond':228 'broader':48 'call':12,26,141 'challeng':115 'classif':68 'connect':191 'consist':142 'content':197 'convers':85 'data':61,213 'decim':135 'document':176,206,239 'embed':69 'endpoint':6,20,30,88,109,218,225 'estim':79 'exact':155 'exampl':210 'exchang':74 'extrem':178 'feed':73 'financ':70 'function':236 'gas':78 'gate':3,17,175 'generat':86 'geocod':83 'http':116 'id':41 'infer':64 'infrastructur':81 'json-response' 'key':164 'limit':167 'list':224 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':151 'mime':230 'network':101 'no-api-key' 'openapi':201 'page':186 'paid':9,23 'pay':56 'pay-per-request':55 'pay-per-request API' 'payment':149,174 'payment-g':173 'paywal':46 'per':11,25,57,93,140 'per-cal':10,24 'per-call-pricing' 'platform':50,234 'poor':238 'price':72,90,148 'probe':108 'prompt':193 'protocol':105 'provid':33 'pure':172 'quot':77 'rate':75,166 'receipt':5,19,36,217 'render':188 'request':58,94,118 'request/response':204 'requir':169 'resourc':37 'return':111,214 'schema':205 'scheme':156 'second':160 'sentiment':65 'settl':95 'sinc':131 'site':145 'span':60 'spec':202 'specif':38,107 'suit':53 'summar':67 'thin':179 'timeout':161 'token':76 'transact':4,18,35,40 'transaction receipt API' 'transaction-receipt' 'translat':137 'type':231 'unit':124 'unknown':227 'usag':209 'usdc':14,28,97,126,132 'usdc-settlement' 'use':133 'util':82 'valid':84,113 'via':102,152 'wallet':192 'web3':71 'x402':2,16,45,104,114,154 'x402 paid API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"89f9901f-122e-488c-955d-9f2266c51fb9","listingId":"1d7646f8-6cb1-4f23-86ef-7e7ff338d491","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/256/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":"2026-04-18T18:59:39.026Z"}],"sources":[{"listingId":"1d7646f8-6cb1-4f23-86ef-7e7ff338d491","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/256/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:39.026Z","lastSeenAt":"2026-04-24T15:03:06.563Z"}],"details":{"listingId":"1d7646f8-6cb1-4f23-86ef-7e7ff338d491","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/256/receipt\n# Returns HTTP 402 with x402 challenge.\n# Include X-PAYMENT header with valid x402 payment proof to receive the receipt.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/256/receipt"},{"claim":"All endpoints 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 APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/256/receipt"}],"useCases":["Retrieving transaction receipts via programmatic payment","Demonstrating x402 protocol payment flows on Base","Agent-driven pay-per-call API consumption without API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Projects requiring USDC-settled micropayment endpoints"],"notFor":["Production use requiring documented request/response schemas","High-volume use cases needing bulk pricing or subscriptions","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.598Z"},"updatedAt":"2026-04-24T15:03:06.563Z"}}