{"id":"293043fa-eafb-41ce-9b7b-a109bcece684","shortId":"vhpMCV","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 207) behind an x402 paywall. The broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics, AI & machine learning (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, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint probed (/api/v1/transactions/207/receipt) returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely thin — the /docs, /pricing, /api, 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 available. The nature of what the \"transaction receipt\" contains is not documented, making it difficult to assess the endpoint's practical utility without experimentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","transaction-receipt","json-response","post-method"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for request or response payloads","The specific endpoint (/api/v1/transactions/207/receipt) purpose is undocumented; unclear what data the receipt contains","The broader platform advertises many API categories but none could be verified beyond the landing page descriptions"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/207/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/207/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 documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific receipt endpoint is unclear, and all doc pages return only a wallet-connect 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'/api/v1/transactions/207/receipt':118 '/docs':178 '/pricing':179 '/readme':182 '0.02':93,145 '000':129 '0x8335':134 '20':128 '207':42 '300':162 '6':140 'Base network API' 'USDC micropayment API' 'accept':167 'access':34 'advertis':51,153 'ai':63 'analysi':67 'analyt':62 'api':59,105 'application/json':172 'assess':224 'avail':208 'base':8,22,101,130,136 'base-network' 'behind':43 'broader':48 'call':12,26,147 'challeng':123 'classif':69 'commit':112 'connect':188 'consist':148 'contain':216 'content':194 'convers':86 'data':61 'decim':141 'difficult':222 'document':173,203,219 'embed':70 'endpoint':6,20,30,89,116,166,226 'estim':80 'exact':159 'exampl':207 'exchang':75 'experiment':231 'extrem':175 'feed':74 'financ':71 'gas':79 'gate':3,17 'generat':87 'geocod':84 'id':41 'infrastructur':82 'json-response' 'key':106 'learn':65 'limit':109 'lowpaymentfee' 'lowpaymentfee.com':32,49 'machin':64 'make':220 'maxamountrequir':126 'natur':210 'network':102 'openapi':198 'page':183 'paid':9,23 'pay':56 'pay-per-call API' 'pay-per-request':55 'payment':156 'paywal':46 'per':11,25,57,94,146 'per-cal':10,24 'per-request-pricing' 'platform':50 'post':168 'post-method' 'practic':228 'price':73,91,154 'probe':117 'prompt':190 'provid':33 'quot':78 'rate':76,108 'receipt':5,19,39,215 'render':185 'request':58,95,169 'request/response':201 'requir':113 'return':119,171 'schema':202 'scheme':157 'second':163 'sentiment':66 'settl':96 'sinc':137 'site':151 'span':60 'spec':199 'specif':37,115 'suit':53 'summar':68 'thin':176 'timeout':164 'token':77 'transact':4,18,38,40,214 'transaction receipt API' 'transaction-receipt' 'translat':143 'unit':131 'usag':206 'usdc':14,28,98,133,138 'usdc-settlement' 'use':139 'util':83,229 'valid':85,121 'wallet':189 'web3':72 'without':230 'x402':2,16,45,122 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"d068be60-1ea9-4e31-b704-1f02e853b7ee","listingId":"293043fa-eafb-41ce-9b7b-a109bcece684","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/207/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":"2026-04-18T18:59:21.653Z"}],"sources":[{"listingId":"293043fa-eafb-41ce-9b7b-a109bcece684","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/207/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:21.653Z","lastSeenAt":"2026-04-24T17:03:04.705Z"}],"details":{"listingId":"293043fa-eafb-41ce-9b7b-a109bcece684","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/207/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with USDC payment proof to access.","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/207/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 & ML, 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/207/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 207 via a single micropayment","Demonstrating x402 protocol payment flows on Base","Agent-driven pay-per-use API consumption without API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Testing USDC micropayment integrations"],"notFor":["Production workloads requiring documented request/response schemas","Bulk transaction receipt retrieval across many transaction IDs","Users who need traditional API key authentication or free-tier access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.479Z"},"updatedAt":"2026-04-24T17:03:04.705Z"}}