x402basequality 0.25

x402-gated API key endpoint on Base, paying $0.02 in USDC per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/apikeys/80

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which advertises a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.

The specific resource `/api/v1/apikeys/80` is listed as "Premium API Access" in the x402 challenge. The challenge confirms it accepts an exact payment scheme on Base, requiring up to 20,000 base units of USDC (0x8335…0913), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.

Documentation 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 spec, no request/response schema, and no explanation of what "Premium API Access" actually returns or what input parameters it expects. The platform's landing page lists many other endpoints (analytics, AI, finance, utilities) but provides no detail on any of them beyond names and prices. Without documentation, the actual functionality behind this endpoint is unknown.

Capabilities

x402-paymentusdc-settlementbase-networkper-request-pricingjson-responsepost-method

Use cases

  • —Acquiring API access via a single micropayment without traditional API key signup
  • —Agent-driven programmatic access to premium endpoints using x402 payment flow
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment-gated APIs
  • —AI agents that need keyless, pay-per-call API access on Base
  • —Projects wanting to test USDC micropayment flows

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —Anyone requiring known, well-documented request/response schemas before integration
  • —High-volume use cases where $0.02 per request adds up without volume discounts

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/apikeys/80 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/apikeys/80
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what the endpoint actually does, what inputs it accepts, or what it returns. No OpenAPI spec, no examples, no request/response schemas. The name 'Premium API Access' is vague. This is effectively a stub listing.

Warnings

  • —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
  • —No OpenAPI or schema definition found for this endpoint
  • —The purpose and functionality of '/api/v1/apikeys/80' ('Premium API Access') is completely undocumented
  • —The broader platform lists many endpoints but provides no technical detail on any of them

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 15:21:21Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/TkDL8h
x402-gated API key endpoint on Base, paying $0.02 in USDC per request. — Clawmart · Clawmart