{"id":"b8a6bf10-dc05-4cc8-9c7c-5f5a48f54562","shortId":"pVSmuw","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides a \"Premium API Access\" transaction receipt resource. When called via POST, it returns a JSON receipt for transaction ID 68. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact payment scheme.\n\nThe endpoint charges a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The provider's landing page confirms a flat $0.02/request pricing model across all their endpoints, with no API keys, no rate limits, and instant access. The broader lowpaymentfee.com platform advertises additional API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. 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 confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to know what data the receipt contains or what input the POST body expects.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The endpoint path references a specific transaction ID (68), suggesting it may not be a general-purpose resource","The broader platform advertises many API categories (AI, finance, analytics, infrastructure) but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/68/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/68/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 schema, no documentation beyond a wallet-connect prompt, and the specific endpoint path (/transactions/68/receipt) suggests a single hardcoded resource rather than a general-purpose API. Effectively a stub 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'/docs':180 '/pricing':182 '/readme':184 '/request':17,34,109 '0.02':16,33,97,108,172 '000':88 '0x8335':73 '20':87 '2913':74 '402':224 '6':93 '68':62 'Base network API' 'USDC micropayment API' 'access':46,125 'across':112 'actual':214 'addit':131 'advertis':130 'ai':142 'analysi':146 'analyt':136 'api':45,118,132 'base':9,26,68,89 'base-network' 'bodi':247 'broader':127 'call':4,21,51 'categori':133 'challeng':226 'charg':83 'classif':149 'confirm':105,219 'connect':190 'contain':215,241 'content':196 'contract':72 'convers':166 'data':135,139,238 'decim':94 'difficult':234 'document':175,205,231 'embed':150 'enabl':38 'endpoint':7,24,39,82,115,217 'equal':96 'estim':160 'exact':78 'exampl':208 'exchang':155 'expect':248 'export':140 'extrem':177 'feed':154 'financ':151 'flat':107 'gas':159 'generat':167 'geocod':164 'id':61 'includ':134 'infrastructur':162 'input':244 'insight':141 'instant':124 'json':57 'key':119 'know':236 'lack':229 'land':103 'learn':144 'limit':122 'live':220 'lowpaymentfee' 'lowpaymentfee.com':41,128 'machin':143 'make':232 'maximum':85 'metric':137 'model':111 'network':69 'no-api-key' 'openapi':200 'page':104,185 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request API' 'payload':213 'payment':63,79 'per':3,20,98 'platform':129 'point':174 'post':53,246 'premium':44 'price':110,153,173 'prompt':192 'proper':223 'provid':42,101 'quot':158 'rate':121,156 'receipt':6,23,48,58,212,240 'render':187 'report':138 'request':99 'request/response':203 'resourc':49 'return':55,221 'schema':204 'scheme':80 'sentiment':145 'settl':12,29,65 'spars':178 'spec':201 'substant':195 'summar':148 'text':147 'token':157 'transact':5,22,47,60 'transaction receipt API' 'transaction-receipt' 'unit':90 'usdc':14,31,71,92 'usdc-settlement' 'use':70 'util':163 'valid':165 'via':10,27,52 'wallet':191 'web3':152 'x402':11,28,37,77,225 'x402 payment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"03d9b9e2-6f6d-4872-b551-9d42eaa166fe","listingId":"b8a6bf10-dc05-4cc8-9c7c-5f5a48f54562","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/68/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":"2026-04-18T19:27:02.170Z"}],"sources":[{"listingId":"b8a6bf10-dc05-4cc8-9c7c-5f5a48f54562","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/68/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:02.170Z","lastSeenAt":"2026-04-24T14:03:27.101Z"}],"details":{"listingId":"b8a6bf10-dc05-4cc8-9c7c-5f5a48f54562","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/68/receipt \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/68/receipt"},{"claim":"Platform charges $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/68/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 68 via a single paid API call","Demonstrating x402 pay-per-call patterns on the Base network","Agent-driven micropayment workflows settling in USDC"],"bestFor":["Developers experimenting with x402 payment protocols","Agents needing pay-per-call access without API key management","Low-cost USDC-settled API consumption on Base"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or high-volume receipt retrieval (no batch endpoint documented)","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.214Z"},"updatedAt":"2026-04-24T14:03:27.101Z"}}