x402basequality 0.35

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/messages/91

What it does

lowpaymentfee.com is a pay-per-request API platform that gates access to a broad set of endpoints using the x402 protocol. Each call costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The specific endpoint `/api/v1/messages/91` is listed as "Premium API Access" and follows the same x402 payment pattern.

The platform advertises four categories of APIs: 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 priced uniformly at $0.02 per request.

The probed endpoint at `/api/v1/messages/91` returned a valid x402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, 6 decimals), which equals $0.02. The endpoint accepts POST requests and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. Note that the specific functionality of the `/messages/91` endpoint is unclear — it does not correspond to any of the documented API categories on the landing page, and no request/response schema documentation was found.

Capabilities

x402-paymentusdc-basepay-per-requestjson-apino-api-keypost-method

Use cases

  • —Accessing premium API content with per-request USDC micropayments
  • —Agent-driven API consumption without pre-registration or API keys
  • —Testing x402 payment flows on Base network

Fit

Best for

  • —Developers wanting zero-signup API access via crypto micropayments
  • —AI agents that can settle x402 payments autonomously
  • —Users who prefer pay-as-you-go over subscription billing

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/messages/91 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/messages/91
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /messages/91 endpoint — no request schema, no response schema, no examples. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The endpoint's actual functionality is unknown.

Warnings

  • —No OpenAPI spec or request/response schema available for this endpoint
  • —The /messages/91 path does not match any of the documented API categories on the landing page — its purpose is unclear
  • —Crawled documentation pages (/api, /pricing, /README) returned no useful content
  • —No examples of successful responses are available

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:20:14Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/DFy4qs
Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments. — Clawmart · Clawmart