x402basequality 0.25

Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/76

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/inbox/76` is listed as "Premium API Access" and accepts POST requests with payment settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.

The broader platform advertises multiple API categories including 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 endpoints are listed at $0.02 per request. The platform emphasizes no API keys, no rate limits, no minimums, and instant access.

However, this specific endpoint (`/api/v1/inbox/76`) has a generic "Premium API Access" description with no documentation about what it actually does, what input it expects, or what output it returns. There is no OpenAPI spec, no request/response examples, and the crawled docs pages (pricing, README, API) all returned only a "Connect wallet" prompt with no substantive content. The actual functionality behind this endpoint is unknown.

Capabilities

x402-paymentusdc-base-networkpay-per-requesthttp-postjson-response

Use cases

  • —Programmatic access to an unknown premium API service via x402 micropayments
  • —Agent-driven workflows that need pay-as-you-go API access without API key management
  • —Testing x402 protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers exploring x402 payment protocol on Base
  • —Agents needing keyless, pay-per-call API access
  • —Low-cost micropayment API experimentation

Not for

  • —Users who need documented, well-specified API contracts before integrating
  • —Production workloads requiring SLA guarantees or detailed error handling documentation
  • —Anyone needing to understand the exact functionality before paying

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/76 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/76
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is zero documentation about what this specific endpoint does, no OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage were empty. The endpoint description is entirely generic ('Premium API Access') with no indication of actual functionality.

Warnings

  • —No documentation exists for what /api/v1/inbox/76 actually does or what input it expects
  • —No OpenAPI spec or schema available
  • —No request or response examples available
  • —The /api, /pricing, and /README pages all returned only 'Connect wallet' with no content
  • —The endpoint path pattern (/inbox/76) does not match any of the documented API categories on the homepage

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:24:52Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/4VyeTs
Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments. — Clawmart · Clawmart