x402-gated Stripe invoice endpoint on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 payment wall. The specific resource `/api/v1/stripe/invoices/27` appears to be a Stripe invoice-related API endpoint. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 "exact" scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto data feeds, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific listing is for the Stripe invoices endpoint (resource 27), whose exact functionality is not documented in the crawled material. The endpoint accepts POST requests and returns application/json.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The endpoint is confirmed live (402 challenge captured), but the actual behavior behind the paywall is unknown.
Capabilities
Use cases
- —Accessing Stripe invoice data via a pay-per-call model without API key registration
- —Programmatic invoice retrieval settled in USDC on Base
- —Agent-driven invoice workflows using x402 payment protocol
Fit
Best for
- —Developers wanting keyless, pay-per-use access to invoice data
- —AI agents that can settle x402 payments on Base in USDC
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or request/response schemas before purchasing
- —High-volume invoice processing where $0.02/call adds up significantly
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/27 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02/call in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind the paywall is undocumented — the description 'Premium API Access' and the path '/stripe/invoices/27' are the only clues. This is effectively a stub listing.
Warnings
- —No API documentation available — /docs, /pricing, /api, and /README pages all return only a wallet-connect prompt
- —No OpenAPI or request/response schema provided; actual endpoint behavior behind the paywall is unknown
- —The specific resource '/api/v1/stripe/invoices/27' with a hardcoded ID (27) suggests this may be a single fixed invoice rather than a general-purpose invoices API
- —The platform lists many endpoints but none have documented schemas or usage examples
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/stripe/invoices/27
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/27
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com