{"id":"baecc5f3-2d1a-4d01-9800-b046e783fef5","shortId":"WuujcF","kind":"x402","title":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call transaction receipt endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to a transaction receipt resource (transaction ID 290) via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact payment scheme. The advertised cost is $0.02 per request (20,000 base units of USDC with 6 decimals).\n\nThe provider's landing page lists a broad catalog of pay-per-call APIs spanning 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 priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, the specific endpoint being listed here is `/api/v1/transactions/290/receipt`, which appears to be a transaction receipt retrieval resource rather than one of the catalog items shown on the homepage.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual response format and required POST body are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 paid endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/transactions/290/receipt is not listed in the provider's homepage catalog — its purpose and response format are unknown","No request body schema or response schema documented anywhere","The endpoint appears to be for a single hardcoded transaction ID (290), which may indicate a demo or test resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/290/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/290/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 x402 challenge, but there is no documentation, no OpenAPI spec, no request/response examples, and the docs pages are empty. The specific resource (transaction 290 receipt) is not explained anywhere on the site. This is effectively a stub 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'/api/v1/transactions/290/receipt':163 '/docs':189 '/pricing':191 '/readme':193 '/request':17,34 '0.02':16,33,78,142 '000':82 '0x8335':66 '20':81 '290':51 '2913':67 '402':229 '6':88 'Base network API' 'USDC micropayment API' 'access':43 'actual':234 'advertis':75 'ai':113 'analysi':117 'analyt':107 'api':104,147 'appear':165 'avail':220 'base':9,26,61,83 'base-network' 'bodi':240 'broad':97 'call':4,21,103 'catalog':98,178 'challeng':231 'classif':120 'commit':154 'confirm':224 'connect':199 'contract':65 'convers':137 'cost':76 'data':106,110 'decim':89 'detail':206 'document':184,215 'embed':121 'enabl':38 'endpoint':7,24,39,158,222 'estim':131 'exact':71 'exampl':218 'exchang':126 'export':111 'extrem':186 'feed':125 'financ':122 'format':236 'gas':130 'generat':138 'geocod':135 'homepag':183 'howev':155 'id':50 'infrastructur':133 'insight':112 'item':179 'key':148 'land':93 'learn':115 'limit':151 'list':95,160 'live':225 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':114 'metric':108 'network':62 'no-api-key' 'one':175 'openapi':210 'page':94,194 'pay':2,19,101 'pay-per-cal':1,18,100 'pay-per-call' 'pay-per-request API' 'payload':219 'payment':56,72 'per':3,20,79,102,143 'post':54,239 'price':124,140 'prompt':201 'proper':228 'provid':42,91 'quot':129 'rate':127,150 'rather':173 'receipt':6,23,47,170 'render':196 'report':109 'request':55,80,144 'request/response':213 'requir':238 'resourc':48,172 'respons':235 'retriev':171 'return':226 'schema':214 'scheme':73 'sentiment':116 'settl':12,29,58 'shown':180 'span':105 'spars':187 'spec':211 'specif':157 'summar':119 'technic':205 'text':118 'token':128 'transact':5,22,46,49,169 'transaction receipt API' 'transaction-receipt' 'unit':84 'unknown':242 'usdc':14,31,64,86 'usdc-settlement' 'use':63 'util':134 'valid':136 'via':10,27,52 'wallet':200 'web3':123 'x402':11,28,37,70,230 'x402 paid endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"b433f750-3e41-4191-a7ab-b5377d603aba","listingId":"baecc5f3-2d1a-4d01-9800-b046e783fef5","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/290/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":"2026-04-18T19:25:48.326Z"}],"sources":[{"listingId":"baecc5f3-2d1a-4d01-9800-b046e783fef5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/290/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:48.326Z","lastSeenAt":"2026-04-24T11:32:47.754Z"}],"details":{"listingId":"baecc5f3-2d1a-4d01-9800-b046e783fef5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/290/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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/290/receipt"},{"claim":"All APIs 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 provider lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/290/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 290 via a paid API call","Demonstrating x402 payment protocol integration on Base","Agent-driven pay-per-call data retrieval without API key management"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Projects requiring USDC-settled micropayment endpoints"],"notFor":["Production workloads requiring documented request/response schemas","Bulk or high-volume data retrieval where per-call pricing is inefficient","Users who need traditional API key authentication or OAuth flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.738Z"},"updatedAt":"2026-04-24T11:32:47.754Z"}}