{"id":"bc76f71b-704e-4561-8f85-10997f8a0434","shortId":"cChZLt","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 363) 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/363/receipt) 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 equals $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 \"exact\" scheme, requiring no API keys, no rate limits, and no prior registration — just an X-PAYMENT header with a valid payment proof.\n\nDocumentation is extremely thin. The /docs, /api, /pricing, 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 examples of what the receipt payload actually contains. The endpoint is live and responds correctly with a 402 challenge, but without documentation it is unclear what fields the receipt response includes or what request body (if any) is expected.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","no-api-key","no-rate-limit"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found for request or response payloads.","This endpoint is for a specific transaction ID (363); it is unclear whether other transaction IDs are available or how to discover them.","The broader platform advertises many API categories (AI, analytics, finance, utilities) but none could be verified beyond the landing page listings."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/363/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/363/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 of request or response schemas, and no examples. The docs pages are empty. The specific endpoint is for a single transaction receipt (ID 363), making its general utility 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'/api/v1/transactions/363/receipt':111 '/docs':183 '/pricing':185 '/readme':187 '0.02':93,138 '000':122 '0x8335':127 '20':121 '2913':128 '363':42 '402':228 '6':134 'Base network API' 'USDC micropayment API' 'access':34 'actual':217 'advertis':51,146 'ai/ml':63 'analysi':66 'analyt':62 'api':59,158 'base':8,22,101,123,130 'base-network' 'behind':43 'bodi':245 'broader':48 'call':12,26,140 'challeng':116,229 'classif':68 'connect':193 'consist':141 'contain':218 'content':199 'convers':86 'correct':225 'data':61,72 'decim':135 'document':178,208,232 'embed':69 'endpoint':6,20,30,89,109,220 'equal':137 'estim':80 'exact':154 'exampl':211 'exchang':75 'expect':249 'extrem':180 'feed':74 'field':237 'financ':70 'gas':79 'gate':3,17 'generat':87 'geocod':84 'header':172 'id':41 'includ':241 'infer':64 'infrastructur':82 'key':159 'limit':162 'live':222 'lowpaymentfee' 'lowpaymentfee.com':32,49 'made':150 'maxamountrequir':119 'network':102 'no-api-key' 'no-rate-limit' 'openapi':203 'page':188 'paid':9,23 'pay':56 'pay-per-call API' 'pay-per-request':55 'payload':216 'payment':148,171,176 'paywal':46 'per':11,25,57,94,139 'per-cal':10,24 'platform':50 'price':73,91,147 'prior':165 'probe':110 'prompt':195 'proof':177 'protocol':106 'provid':33 'quot':78 'rate':76,161 'receipt':5,19,39,215,239 'registr':166 'render':190 'request':58,95,244 'request/response':206 'requir':156 'respond':224 'respons':240 'return':112 'schema':207 'scheme':155 'sentiment':65 'settl':96 'sinc':131 'site':144 'span':60 'spec':204 'specif':37,108 'substant':198 'suit':53 'summar':67 'thin':181 'token':77 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'unclear':235 'unit':124 'usdc':14,28,98,126,132 'usdc-settlement' 'use':133 'util':83 'valid':85,114,175 'via':103,151 'wallet':194 'web3':71 'without':231 'x':170 'x-payment':169 'x402':2,16,45,105,115,153 'x402 paid endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"6ecb5f66-a85d-4408-a3b3-90316ff9f8fa","listingId":"bc76f71b-704e-4561-8f85-10997f8a0434","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/363/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":"2026-04-18T19:26:21.105Z"}],"sources":[{"listingId":"bc76f71b-704e-4561-8f85-10997f8a0434","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/363/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:21.105Z","lastSeenAt":"2026-04-24T07:32:36.772Z"}],"details":{"listingId":"bc76f71b-704e-4561-8f85-10997f8a0434","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/363/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment proof on Base 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/363/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 advertises APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/transactions/363/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 363 via a single micropayment","Programmatic access to paid API endpoints without API key management","Agent-driven workflows that need on-demand receipt data settled in USDC on Base"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","Crypto-native workflows that can sign x402 payment proofs on Base","Low-friction one-off data retrieval without subscription commitments"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","High-volume batch retrieval where per-call pricing may add up","Non-crypto users who cannot produce x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.144Z"},"updatedAt":"2026-04-24T07:32:36.772Z"}}