{"id":"e3a9eacc-f874-4cc9-a87c-34b3615ba531","shortId":"WsLymh","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 a \"Premium API Access\" receipt for transaction ID 64. It is part of a broader platform offering dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/64/receipt` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B...85F3` on Base. No API keys or rate limits are advertised; access is gated purely by the x402 payment protocol.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema`, and no examples of what the receipt payload actually contains. The platform lists many other endpoints (sentiment analysis, summarization, embeddings, price feeds, geocoding, etc.) at the same $0.02 price point, but none have documented schemas either. Treat this as a low-documentation, exploratory-stage service.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-request","json-response","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 payment endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","402 payment required"],"warnings":["No OpenAPI spec or request/response schema available","Docs, pricing, and API pages all render only 'Connect wallet' with no technical content","Endpoint path contains a hardcoded transaction ID (64) — unclear if other IDs are supported","The platform lists many endpoints but none have documented behavior or schemas","Response payload structure is completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/64/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/64/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 documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and the docs pages render only a wallet-connect prompt. The specific endpoint serves a single hardcoded transaction ID with unknown response 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'/request':17,34 '0.02':16,33,80,118,214 '000':113 '0x1a2b':130 '20':112 '402 payment required' '6':123 '64':51 '85f3':131 'Base network API' 'USDC micropayment API' 'accept':95 'access':46,142 'actual':195 'address':129 'advertis':141 'ai/ml':70 'analysi':204 'analyt':69 'api':45,66,135,159 'base':9,26,89,114,133 'base-network' 'beyond':181 'broader':57 'call':4,21,126 'challeng':103,184 'confirm':104 'connect':165 'contain':196 'data':68,73 'decim':124 'detail':172 'doc':156 'document':151,220,229 'dozen':60 'either':222 'embed':206 'enabl':38 'endpoint':7,24,39,93,202 'etc':210 'exampl':189 'exploratori':231 'exploratory-stag':230 'extrem':153 'feed':208 'finance/web3':72 'gate':144 'geocod':209 'id':50 'infer':71 'json':100 'json-response' 'key':136 'limit':139 'list':199 'live':107 'low':228 'low-document':227 'lowpaymentfee' 'lowpaymentfee.com':41 'mani':200 'maximum':110 'network':90 'no-api-key' 'none':218 'offer':59 'openapi':176 'outputschema':186 'page':160 'paid':127 'part':54 'pay':2,19,63 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':62 'payload':194 'payment':149 'per':3,20,64,81,125 'platform':58,198 'point':216 'post':96 'premium':44 'price':78,157,207,215 'prompt':167 'protocol':150 'provid':42 'pure':145 'rate':138 'receipt':6,23,47,193 'render':162 'request':65,82,97 'request/response':179 'requir':108 'return':99 'schema':180,221 'sentiment':203 'servic':76,233 'settl':12,29,84 'sinc':120 'span':67 'spars':154 'spec':177 'specif':92 'stage':232 'summar':205 'technic':171 'transact':5,22,49 'transaction receipt API' 'transaction-receipt' 'treat':223 'unit':115 'usd':119 'usdc':14,31,86,117,121 'usdc-settlement' 'use':122 'util':75 'via':10,27 'wallet':166 'x402':11,28,37,102,148,183 'x402 payment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"8c67d40e-5bb2-421b-8a21-f6e4f74463d1","listingId":"e3a9eacc-f874-4cc9-a87c-34b3615ba531","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/64/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":"2026-04-18T19:26:56.245Z"}],"sources":[{"listingId":"e3a9eacc-f874-4cc9-a87c-34b3615ba531","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/64/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:56.245Z","lastSeenAt":"2026-04-24T02:32:54.665Z"}],"details":{"listingId":"e3a9eacc-f874-4cc9-a87c-34b3615ba531","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/64/receipt \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/64/receipt"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/64/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 64 via a single paid API call","Demonstrating x402 payment-gated API access patterns on Base","Integrating pay-per-use API calls into agent workflows without API key management"],"bestFor":["Developers experimenting with x402 payment protocols","Agents needing keyless, pay-per-call API access on Base","Prototyping micropayment-gated service architectures"],"notFor":["Production workloads requiring well-documented, schema-validated APIs","Bulk transaction receipt retrieval (single transaction ID hardcoded in path)","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.538Z"},"updatedAt":"2026-04-24T02:32:54.665Z"}}