{"id":"d49f0bb2-5b2e-421f-9f71-609e6d4c55a8","shortId":"CQR8yr","kind":"x402","title":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","tagline":"x402-gated transaction receipt endpoint on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides a transaction receipt resource (transaction ID 86) behind an x402 paywall. It is part of a broader platform that advertises multiple API categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transactions/86/receipt` accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers receive a 402 challenge specifying the USDC asset on Base (contract `0x8335…2913`), and must attach an `X-PAYMENT` header with a valid payment proof. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. No API keys or rate limits are advertised; access is purely pay-per-use.\n\nDocumentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's `outputSchema`, and no explanation of what the receipt payload actually contains. The platform appears to be a demonstration or early-stage x402 showcase rather than a mature production API.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","transaction-receipt","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"],"warnings":["Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no substantive content.","No OpenAPI or schema describing the receipt response payload.","Endpoint is hardcoded to transaction ID 86 — unclear if other transaction IDs are available or what the receipt contains.","Platform appears to be a demo or early-stage project; production readiness is uncertain."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/86/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/86/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, but documentation is essentially nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and no description of what the receipt payload contains. The endpoint is scoped to a single transaction ID (86), which limits general 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'0.02':71,141 '000':132 '0x8335':111 '20':131 '2913':112 '402':102 '6':137 '86':40 'Base network API' 'USDC micropayment API' 'accept':86 'access':152 'actual':203 'advertis':53,151 'ai':60 'amount':128 'analyt':59 'api':55,145,166,223 'appear':207 'application/json':91 'asset':107 'attach':115 'base':8,22,80,109,133 'behind':41 'beyond':189 'broader':50 'call':12,26,143 'caller':99 'categori':56 'challeng':103,192 'connect':174 'contain':204 'content':180 'contract':110 'data':58 'decim':138 'demonstr':211 'doc':164 'document':159 'earli':214 'early-stag':213 'endpoint':6,20,30,84 'equal':140 'explan':197 'extrem':161 'financ':63 'gate':3,17 'handl':94 'header':120 'id':39 'includ':57 'infrastructur':66 'json-response' 'key':146 'learn':62 'limit':149 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'matur':221 'max':127 'multipl':54 'must':114 'network':81 'no-api-key' 'openapi':184 'outputschema':194 'page':169 'paid':9,23 'part':47 'pay':156 'pay-per-call API' 'pay-per-us':155 'payload':202 'payment':92,119,124 'paywal':44 'per':11,25,72,142,157 'per-cal':10,24 'per-call-pricing' 'platform':51,206 'post':87 'price':69,165 'product':222 'prompt':176 'proof':125 'protocol':98 'provid':33 'pure':154 'rate':148 'rather':218 'readm':168 'receipt':5,19,36,201 'receiv':100 'render':171 'request':73,88 'request/response':187 'requir':129 'resourc':37 'return':90 'schema':188 'settl':75 'showcas':217 'spec':185 'specif':83 'specifi':104 'stage':215 'substant':179 'thin':162 'transact':4,18,35,38 'transaction receipt API' 'transaction-receipt' 'unit':134 'usdc':14,28,77,106,136 'usdc-base' 'use':158 'util':67 'valid':123 'via':95 'wallet':175 'web3':64 'x':118 'x-payment':117 'x402':2,16,43,97,191,216 'x402 payment endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"3d9d3882-c18e-46c7-bc36-05499b17a669","listingId":"d49f0bb2-5b2e-421f-9f71-609e6d4c55a8","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/86/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":"2026-04-18T19:27:13.073Z"}],"sources":[{"listingId":"d49f0bb2-5b2e-421f-9f71-609e6d4c55a8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/86/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:13.073Z","lastSeenAt":"2026-04-24T00:32:40.449Z"}],"details":{"listingId":"d49f0bb2-5b2e-421f-9f71-609e6d4c55a8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/86/receipt\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment proof to proceed.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/86/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 platform lists categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/86/receipt"}],"useCases":["Retrieving a transaction receipt for transaction 86 via a micropayment","Demonstrating x402 protocol payment flows on Base","Integrating pay-per-call USDC-settled endpoints into agent workflows"],"bestFor":["Developers experimenting with x402 protocol integrations","Agents that need to make micropayment-gated API calls on Base","Testing USDC-settled per-request payment flows"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based API access","Retrieving arbitrary transaction receipts (endpoint is scoped to transaction 86)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.749Z"},"updatedAt":"2026-04-24T00:32:40.449Z"}}