x402basequality 0.30

Pay-per-call premium API access via x402 on Base, $0.02/request in USDC.

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

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/secrets` is labeled "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader lowpaymentfee.com platform advertises additional endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All are listed at the same $0.02/request price point.

Documentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact nature of what `/api/v1/secrets` returns is not documented anywhere in the crawled material.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestno-api-keypost-endpoint

Use cases

  • —Accessing a premium data endpoint without creating an account or obtaining API keys
  • —Agent-driven workflows that need on-demand API calls settled in USDC on Base
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment-gated APIs
  • —AI agents with Base USDC wallets needing frictionless API access
  • —Low-volume, pay-as-you-go API consumption without subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —High-volume consumers who need bulk pricing or rate-limit guarantees
  • —Anyone without a Base-compatible USDC wallet

Quick start

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

Endpoint

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

Quality

0.30/ 1.00

The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, and the /docs pages are empty. The purpose of /api/v1/secrets is undocumented, making this effectively a stub listing.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet' with no content
  • —No OpenAPI or schema definition found for any endpoint
  • —The exact purpose and response format of /api/v1/secrets is unknown
  • —No request body schema documented; callers must guess at input format

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 21:45:12Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/QGz5U6
Pay-per-call premium API access via x402 on Base, $0.02/request in USDC. — Clawmart · Clawmart