{"id":"931e03db-9e09-44f8-bcdf-65059564e087","shortId":"rV6QUM","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 access to a transaction receipt resource (transaction ID 135) via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD.\n\nThe provider's landing page advertises a broader suite of 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 uniformly at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, this specific endpoint is scoped to `/api/v1/transactions/135/receipt`, which appears to be a single transaction receipt resource rather than a general-purpose API.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation describing what the receipt payload contains or what parameters the POST body accepts. The endpoint is confirmed live (returns a valid x402 402 challenge), but the actual functionality behind the paywall is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","transaction-receipt","pay-per-call","no-api-key"],"categories":["finance","infrastructure"],"synonyms":["transaction receipt API","x402 endpoint","USDC micropayment API","Base network API","pay-per-request API","lowpaymentfee","crypto payment API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition provided for request or response payloads","Endpoint path references a specific transaction ID (135); unclear if this is parameterized or a single fixed resource","The broader suite of advertised APIs (AI, analytics, finance, utilities) could not be verified beyond the landing page listing","No robots.txt or agents.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/135/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/135/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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the specific endpoint path (/transactions/135/receipt) suggests a single hardcoded resource rather than a parameterized API. The broader site advertises many endpoints but none are 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'/api/v1/transactions/135/receipt':164 '/docs':186 '/pricing':188 '/readme':190 '/request':17,34 '0.02':16,33,92,143 '000':83 '0x8335':66 '135':51 '20':82 '2913':67 '402':237 '6':88 'Base network API' 'USDC micropayment API' 'accept':227 'access':43 'actual':241 'advertis':99 'ai':113 'amount':77 'analysi':117 'analyt':107 'api':104,148,180 'appear':166 'base':9,26,61,84 'base-network' 'behind':243 'bodi':226 'broader':101 'call':4,21,80 'challeng':238 'classif':120 'commit':156 'confirm':231 'connect':196 'contain':220 'content':202 'contract':65 'convers':137 'crypto payment API' 'data':106,110 'decim':89 'describ':215 'detail':213 'document':181,214 'embed':121 'enabl':38 'endpoint':7,24,39,160,229 'equal':91 'estim':131 'exact':72 'exact-pay':71 'exampl':210 'exchang':126 'export':111 'extrem':183 'feed':125 'financ':122 'function':242 'gas':130 'general':178 'general-purpos':177 'generat':138 'geocod':135 'howev':157 'id':50 'infrastructur':133 'insight':112 'key':149 'land':97 'learn':115 'limit':152 'live':232 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':114 'maximum':76 'metric':108 'minimum':155 'network':62 'no-api-key' 'openapi':206 'page':98,191 'paramet':223 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request API' 'payload':219 'payment':56,73 'paywal':245 'per':3,20,79,144 'post':54,225 'price':124,140 'prompt':198 'provid':42,95 'purpos':179 'quot':129 'rate':127,151 'rather':174 'receipt':6,23,47,172,218 'render':193 'report':109 'request':55,145 'request/response':209 'requir':78 'resourc':48,173 'return':233 'schema':207 'scheme':74 'scope':162 'sentiment':116 'settl':12,29,58 'singl':170 'span':105 'spars':184 'specif':159 'suit':102 'summar':119 'text':118 'token':128 'transact':5,22,46,49,171 'transaction receipt API' 'transaction-receipt' 'unclear':247 'uniform':141 'unit':85 'usd':93 'usdc':14,31,64,87 'usdc-settlement' 'use':63 'util':134 'valid':136,235 'via':10,27,52 'wallet':197 'web3':123 'x402':11,28,37,70,236 'x402 endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"6328d961-aea0-4b50-a007-202a7882ec8f","listingId":"931e03db-9e09-44f8-bcdf-65059564e087","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/135/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":"2026-04-18T18:58:33.402Z"}],"sources":[{"listingId":"931e03db-9e09-44f8-bcdf-65059564e087","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/135/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:33.402Z","lastSeenAt":"2026-04-25T00:05:09.683Z"}],"details":{"listingId":"931e03db-9e09-44f8-bcdf-65059564e087","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/135/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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/135/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 advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/transactions/135/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 135 via programmatic pay-per-call access","Demonstrating x402 payment protocol integration on the Base network","Agent-driven micropayment workflows settling in USDC"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing pay-per-call access without API key management","Use cases requiring USDC micropayments on Base"],"notFor":["Production workloads requiring documented request/response schemas","Bulk transaction receipt retrieval across many transaction IDs","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.756Z"},"updatedAt":"2026-04-25T00:05:09.683Z"}}