{"id":"ab13aa5f-a5b3-4142-baf7-d14d7ab7e02d","shortId":"mEFPBA","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 (transaction ID 26) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated via the x402 protocol on the Base network and settled in USDC.\n\nThe specific endpoint `/api/v1/transactions/26/receipt` accepts POST requests and returns an `application/json` response. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all its endpoints with no API keys, no rate limits, and no minimum commitments.\n\nThe probe confirms the endpoint is live, returning a proper 402 challenge with x402 version 1. However, documentation 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 schema, no request/response examples, and no detailed description of what the receipt resource actually contains or what input parameters the POST body expects. The platform appears to be a demonstration or early-stage deployment of x402-based pay-per-call APIs.","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 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","No OpenAPI or request/response schema provided; input parameters for the POST body are unknown","The specific resource (transaction 26 receipt) is opaque — unclear what data it returns","Platform may be a demo or early-stage deployment; reliability and longevity are uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/26/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/26/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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what the receipt resource contains or what POST body is expected. The listing is effectively a 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'/request':126 '0.02':114,125 '000':103 '0x8335':108 '1':158 '20':102 '26':40 '2913':109 '402':153 '6':119 'Base network API' 'USDC micropayment API' 'accept':86 'across':128 'actual':199 'advertis':53,123 'ai':60 'analyt':59 'api':55,134,166,229 'appear':211 'application/json':92 'base':8,22,76,104,111,224 'base-network' 'behind':41 'bodi':207 'broader':50 'call':12,26,228 'categori':56 'challeng':96,154 'commit':142 'confirm':145 'connect':175 'contain':200 'content':181 'cost':100 'crypto payment API' 'data':58 'decim':120 'demonstr':215 'deploy':220 'descript':193 'detail':192 'doc':165 'document':160 'earli':218 'early-stag':217 'endpoint':6,20,30,84,131,147 'equal':113 'exampl':189 'expect':208 'extrem':162 'financ':63 'gate':3,17,69 'howev':159 'id':39 'includ':57 'indic':97 'infrastructur':66 'input':203 'json-response' 'key':135 'learn':62 'limit':138 'live':149 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'maximum':99 'minimum':141 'multipl':54 'network':77 'no-api-key' 'openapi':185 'page':170 'paid':9,23 'paramet':204 'part':47 'pay':226 'pay-per-cal':225 'pay-per-call' 'pay-per-request API' 'paywal':44 'per':11,25,115,227 'per-cal':10,24 'platform':51,122,210 'post':87,206 'price':127,167 'probe':144 'prompt':177 'proper':152 'protocol':73 'provid':33 'rate':137 'readm':169 'receipt':5,19,36,197 'render':172 'request':88,116 'request/response':188 'resourc':37,198 'respons':93 'return':90,150 'schema':186 'settl':79 'specif':83 'stage':219 'substant':180 'thin':163 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'uniform':124 'unit':105 'usdc':14,28,81,107,117 'usdc-settlement' 'use':118 'util':67 'version':157 'via':70 'wallet':176 'web3':64 'x402':2,16,43,72,95,156,223 'x402 API' 'x402-based':222 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b2a281be-203c-4a80-8a70-5cc1d034ebac","listingId":"ab13aa5f-a5b3-4142-baf7-d14d7ab7e02d","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/26/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":"2026-04-18T18:59:40.899Z"}],"sources":[{"listingId":"ab13aa5f-a5b3-4142-baf7-d14d7ab7e02d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/26/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:40.899Z","lastSeenAt":"2026-04-24T14:33:33.683Z"}],"details":{"listingId":"ab13aa5f-a5b3-4142-baf7-d14d7ab7e02d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/26/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402 version 1, maxAmountRequired 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/26/receipt"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/26/receipt"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction ID 26 via a single paid API call","Demonstrating x402 protocol-based pay-per-call API access on Base","Agent-driven programmatic access to receipt data without API key management"],"bestFor":["Developers experimenting with x402 protocol payments","Agents that need keyless, pay-per-call API access on Base","Use cases requiring low-cost ($0.02) per-request pricing with no commitments"],"notFor":["Production workloads requiring documented request/response schemas","Users who need detailed API documentation or SDKs","Bulk data retrieval where per-request costs would accumulate significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.576Z"},"updatedAt":"2026-04-24T14:33:33.683Z"}}