x402basequality 0.30

Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/messages/151

What it does

lowpaymentfee.com hosts a collection of x402-enabled API endpoints accessible via per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/messages/151` is labeled "Premium API Access" and accepts POST requests with payment settled in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maximum amount of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.

The provider's landing page lists roughly 16 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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.

The `/api/v1/messages/151` endpoint itself has no public documentation beyond its title. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled pages. The endpoint is confirmed live (returns a valid 402 x402 challenge), but what it actually returns after payment is unknown. Agents should be aware that the lack of documented input/output schemas makes integration speculative.

Capabilities

x402-paymentusdc-basepay-per-requestpost-endpointmicropayment

Use cases

  • —Accessing premium API content via USDC micropayments without API key registration
  • —Agent-driven pay-per-call workflows on the Base network
  • —Exploring x402 protocol integrations with low-cost endpoints

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents needing keyless, pay-per-request API access on Base
  • —Low-cost micropayment API consumption

Not for

  • —Production use requiring documented request/response schemas
  • —Use cases needing guaranteed SLAs or support contracts
  • —Users without Base network USDC

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/messages/151 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/messages/151
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI spec, no documented input/output schema, no request or response examples, and the /api, /pricing, and /README pages are all blank (just 'Connect wallet'). The purpose of '/api/v1/messages/151' specifically is unclear beyond its generic title. Effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —The specific purpose and response format of /api/v1/messages/151 is undocumented
  • —Provider's /api, /pricing, and /README pages return no useful content
  • —Cannot verify what data or service is delivered after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:10:11Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/mEjHN5
Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request. — Clawmart · Clawmart