{"id":"ce11c487-ccb8-4231-aa27-bac67e73ee9b","shortId":"4qXGe4","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 253) 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/253/receipt) is live and returns a valid x402 challenge. It accepts POST requests and requires payment of 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 platform's advertised pricing. Payment is made via the x402 \"exact\" scheme, with a 300-second timeout window.\n\nDocumentation on the site 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 examples, and no detailed documentation for any endpoint. The platform appears to be a demonstration or early-stage deployment of x402-based micropayment APIs rather than a mature, well-documented service.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","transaction-receipt","micropayment","no-api-key","post-method"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment","USDC pay-per-call","Base network API","lowpaymentfee","402 payment required API","crypto micropayment endpoint"],"warnings":["All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","No OpenAPI or schema documentation available for any endpoint","This endpoint is scoped to a single transaction ID (253); unclear if it generalizes","The broader platform lists many endpoints but none have documented request/response schemas","Early-stage or demonstration deployment — reliability and longevity are uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/253/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/253/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, but there is no OpenAPI spec, no request/response examples, and all documentation pages are empty stubs. The specific endpoint (transaction 253 receipt) is narrow in scope and its actual response format is 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'0.02':93,155 '000':138 '0x8335':143 '20':137 '253':42 '2913':144 '300':175 '402 payment required API' '6':150 'Base network API' 'USDC pay-per-call' 'accept':128 'access':34 'advertis':51,163 'ai':63 'analysi':67 'analyt':62 'api':59,105,188,236 'appear':221 'base':8,22,101,139,146,234 'behind':43 'broader':48 'call':12,26,157 'challeng':126 'classif':69 'commit':112 'connect':197 'consist':158 'content':203 'convers':86 'crypto micropayment endpoint' 'data':61 'decim':151 'demonstr':225 'deploy':230 'detail':214 'doc':187 'document':179,215,243 'earli':228 'early-stag':227 'embed':70 'endpoint':6,20,30,89,116,218 'estim':80 'exact':171 'exampl':211 'exchang':75 'extrem':184 'feed':74 'financ':71 'gas':79 'gate':3,17 'generat':87 'geocod':84 'id':41 'infrastructur':82 'key':106 'learn':65 'limit':109 'live':120 'lowpaymentfee' 'lowpaymentfee.com':32,49 'machin':64 'made':167 'matur':240 'micropay':235 'micropayment' 'network':102 'no-api-key' 'openapi':207 'page':192 'paid':9,23 'pay':56 'pay-per-request':55 'payment':133,165 'paywal':46 'per':11,25,57,94,156 'per-cal':10,24 'platform':50,161,220 'post':129 'post-method' 'price':73,91,164,189 'probe':117 'prompt':199 'provid':33 'quot':78 'rate':76,108 'rather':237 'readm':191 'receipt':5,19,39 'render':194 'request':58,95,130 'request/response':210 'requir':113,132 'return':122 'scheme':172 'second':176 'sentiment':66 'servic':244 'settl':96 'sinc':147 'site':182 'span':60 'spec':208 'specif':37,115 'stage':229 'substant':202 'suit':53 'summar':68 'thin':185 'timeout':177 'token':77 'transact':4,18,38,40 'transaction receipt API' 'transaction-receipt' 'translat':153 'unit':140 'usdc':14,28,98,142,148 'usdc-base' 'use':149 'util':83 'valid':85,124 'via':168 'wallet':198 'web3':72 'well':242 'well-docu':241 'window':178 'x402':2,16,45,125,170,233 'x402 micropayment' 'x402-based':232 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ad93ecb8-7639-4545-aa18-d048012e502e","listingId":"ce11c487-ccb8-4231-aa27-bac67e73ee9b","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/253/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":"2026-04-18T18:59:47.824Z"}],"sources":[{"listingId":"ce11c487-ccb8-4231-aa27-bac67e73ee9b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/253/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:47.824Z","lastSeenAt":"2026-04-24T13:03:15.477Z"}],"details":{"listingId":"ce11c487-ccb8-4231-aa27-bac67e73ee9b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/253/receipt \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access 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/253/receipt"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages contain only 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving a transaction receipt for transaction 253 via a single micropayment","Demonstrating x402 protocol-based pay-per-request API access","Programmatic access to paid API endpoints without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC micropayments on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users who need free or subscription-based access without crypto wallets","Bulk data retrieval where per-request micropayments are impractical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.238Z"},"updatedAt":"2026-04-24T13:03:15.477Z"}}