{"id":"93180681-6034-4d06-acc4-2e7a4bc71d59","shortId":"agk88N","kind":"x402","title":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","tagline":"Transaction receipt endpoint on Base, paid per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt lookup via the x402 payment protocol. The specific resource `/api/v1/transactions/100/receipt` returns receipt data for transaction ID 100 in JSON format, gated behind a per-request USDC micropayment on the Base network.\n\nThe broader lowpaymentfee.com platform advertises a suite 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe probed endpoint is live and returns a valid x402 challenge. It accepts USDC (contract 0x8335…2913) on Base with a maxAmountRequired of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Payment is made via the `exact` scheme with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","transaction-receipt","per-call-billing","no-api-key","json-response"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 micropayment endpoint","pay-per-call API","USDC gated API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","Docs, pricing, and API pages render only 'Connect wallet' with no substantive content","The endpoint path includes a hardcoded transaction ID (100); it is unclear how to query other transactions","No example request or response bodies are documented anywhere","The platform lists many API categories but none have visible documentation or proof of functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/100/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/100/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no example payloads, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The specific purpose of this particular endpoint (transaction receipt for ID 100) is narrow and 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'0.02':119,163 '000':158 '0x8335':149 '100':51 '20':157 '2913':150 '300':177 '6':166 'Base network API' 'USDC gated API' 'accept':146 'advertis':71 'ai':88 'analysi':92 'analyt':82 'api':79,124,197 'base':5,18,65,152,159 'base-network' 'behind':56 'broader':68 'call':9,22,78 'challeng':144 'classif':95 'commit':132 'connect':203 'content':209 'contract':148 'convers':112 'crawl':192 'crypto payment API' 'data':47,81,85 'decim':167 'detail':183 'doc':194 'document':184 'embed':96 'endpoint':3,16,28,115,136 'equal':162 'estim':106 'exact':173 'exampl':186 'exchang':101 'export':86 'feed':100 'financ':97 'format':54 'found':189 'gas':105 'gate':55 'generat':113 'geocod':110 'id':50 'infrastructur':108 'insight':87 'json':53 'json-response' 'key':125 'learn':90 'limit':128 'list':117 'live':138 'lookup':35 'lowpaymentfee' 'lowpaymentfee.com':30,69 'machin':89 'made':170 'maxamountrequir':155 'metric':83 'micropay':62 'minimum':131 'network':66 'no-api-key' 'openapi':181 'page':198 'paid':6,19 'pay':76 'pay-per-cal':75 'pay-per-call API' 'payment':39,168 'per':8,21,59,77,120 'per-cal':7,20 'per-call-billing' 'per-request':58 'platform':70 'price':99,195 'probe':135 'prompt':205 'protocol':40 'provid':31 'quot':104 'rate':102,127 'receipt':2,15,34,46 'render':200 'report':84 'request':60,121 'requir':133 'resourc':43 'respons':187 'return':45,140 'schema':182 'scheme':174 'second':178 'sentiment':91 'span':80 'specif':42 'suit':73 'summar':94 'text':93 'timeout':179 'token':103 'transact':1,14,33,49 'transaction receipt API' 'transaction-receipt' 'unit':160 'usdc':13,26,61,147,164 'usdc-micropayment' 'use':165 'util':109 'valid':111,142 'via':10,23,36,171 'wallet':204 'web3':98 'x402':11,24,38,143 'x402 micropayment endpoint' 'x402-payment'","prices":[{"id":"2ff1e428-aa48-422c-bb94-b7ab828fe5cf","listingId":"93180681-6034-4d06-acc4-2e7a4bc71d59","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/100/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":"2026-04-18T18:58:21.352Z"}],"sources":[{"listingId":"93180681-6034-4d06-acc4-2e7a4bc71d59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/100/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:21.352Z","lastSeenAt":"2026-04-25T01:32:59.674Z"}],"details":{"listingId":"93180681-6034-4d06-acc4-2e7a4bc71d59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/100/receipt\n# Returns 402 with x402 challenge. Include X-PAYMENT header with valid USDC payment proof to receive the receipt.","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/100/receipt"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform 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 network","source_url":"https://lowpaymentfee.com/api/v1/transactions/100/receipt"}],"useCases":["Retrieving transaction receipt data via a single micropayment","Demonstrating x402 payment-gated API access patterns","Integrating pay-per-call endpoints into agent workflows without API key management"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents needing on-demand transaction receipt lookups without subscription overhead","Projects requiring keyless, pay-as-you-go API access on Base"],"notFor":["High-volume batch transaction lookups where per-call pricing is inefficient","Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.366Z"},"updatedAt":"2026-04-25T01:32:59.674Z"}}