x402basequality 0.30

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/63

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 hosts a variety of pay-per-call 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 endpoint `/api/v1/apikeys/63` appears to be an API-key provisioning or access endpoint. The x402 challenge confirms it is live, accepts POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are required beyond the per-request USDC payment.

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 usage examples available from the crawl. The platform's landing page lists sibling endpoints (sentiment analysis, summarization, geocoding, etc.) but provides no detail on request formats or response payloads for any of them. Prospective users should expect to experiment or contact the provider for integration guidance.

Capabilities

x402-paymentusdc-basepay-per-requestapi-key-provisioningpost-method

Use cases

  • —Programmatically obtaining or activating API keys via a single USDC micropayment
  • —Agent-driven access to gated API resources without traditional subscription signup
  • —Demonstrating x402 payment protocol integration for per-call billing

Fit

Best for

  • —Developers exploring x402 pay-per-call patterns on Base
  • —AI agents that need keyless, wallet-authenticated API access
  • —Prototyping micropayment-gated API workflows

Not for

  • —Production workloads requiring documented request/response schemas
  • —Users without a Base-network USDC wallet
  • —High-volume use cases where $0.02/request adds up significantly

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/apikeys/63 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/apikeys/63
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific endpoint (apikeys/63) is unclear. Effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'
  • —The exact purpose and expected request body for /api/v1/apikeys/63 is undocumented
  • —No response schema or example responses are available from any crawled page
  • —Sibling endpoints listed on the homepage are similarly undocumented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 15:18:33Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/2y5e49
x402-gated API key endpoint on Base, paying $0.02 in USDC per request. — Clawmart · Clawmart