x402-gated Stripe invoice endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to a Stripe invoice resource (invoice ID 180) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services (geocoding, validation, conversion, generation), all priced at $0.02 per request. However, this specific listing covers only the `/api/v1/stripe/invoices/180` endpoint, which appears to expose a Stripe invoice object. The exact response schema is not documented, and the crawled docs/pricing/README pages returned only a wallet-connect prompt with no additional detail.
Because there is no OpenAPI spec, no example request/response payloads, and the documentation pages are effectively empty beyond the landing page summary, the actual behavior of this endpoint is largely opaque. Callers should expect a JSON response related to a Stripe invoice but should be prepared for undocumented fields or behaviors.
Capabilities
Use cases
- —Retrieving Stripe invoice data via a single micropayment without needing an API key
- —Programmatic access to invoice #180 for automated billing or reconciliation workflows
- —Agent-driven payment-gated data retrieval on Base L2
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base for per-call access
- —Use cases requiring keyless, pay-as-you-go invoice data retrieval
Not for
- —Bulk invoice processing requiring batch access to many invoices at once
- —Users who need comprehensive Stripe API coverage (this is a single-resource endpoint)
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/invoices/180 \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schema, no examples, and all documentation pages beyond the landing page are empty wallet-connect stubs. The purpose of this specific invoice endpoint is unclear.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —Documentation pages (/docs, /api, /pricing, /README) return only a wallet-connect prompt with no content
- —The endpoint exposes a single Stripe invoice (ID 180) — unclear what data is returned or what POST body is expected
- —Response format and fields are entirely undocumented
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/stripe/invoices/180
- —Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/invoices/180