x402basequality 0.30

Pay-per-call premium API endpoint on Base via x402 — $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/endpoint-57

What it does

This endpoint at `/api/endpoint-57` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities. All endpoints are accessed via the x402 payment protocol on the Base network, settling in USDC (USD Coin). The platform advertises a flat $0.02 per request with no API keys, no rate limits, and no minimum commitments.

The specific endpoint `/api/endpoint-57` is labeled "Premium API Access" but its exact functionality is not documented beyond that generic title. The x402 challenge confirms it is live, accepts POST requests, and requires a USDC payment of up to 20,000 base units (0.02 USDC, i.e., $0.02) on the Base network. The response MIME type is `application/json`. No OpenAPI schema, detailed input/output documentation, or usage examples were found in the crawled material — the docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.

The broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, it is unclear which (if any) of these corresponds to `/api/endpoint-57`, and no schema or parameter documentation is available for this specific route.

Capabilities

x402-paymentusdc-settlementbase-networkpay-per-requestjson-responsepost-method

Use cases

  • —Programmatic access to a premium API endpoint with per-call USDC micropayments
  • —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
  • —Testing x402 payment protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment-gated APIs
  • —Agents that can settle USDC payments on Base L2
  • —Users who want no-signup, no-API-key access to paid endpoints

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before purchasing
  • —Anyone requiring free or fiat-only payment methods

Quick start

curl -X POST https://lowpaymentfee.com/api/endpoint-57 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/endpoint-57
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for what /api/endpoint-57 actually does, no input/output schema, no examples, and the docs/pricing/README pages are all empty beyond a wallet-connect prompt. The generic 'Premium API Access' label provides no functional clarity.

Warnings

  • —No documentation available for /api/endpoint-57 — its actual functionality is unknown
  • —All docs, pricing, API, and README pages returned only 'Connect wallet' with no content
  • —No OpenAPI schema or input/output specification found
  • —The endpoint path '/api/endpoint-57' does not match any of the named endpoints listed on the homepage

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-18 21:03:23Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/Em2eQp
Pay-per-call premium API endpoint on Base via x402 — $0.02 per request in USDC. — Clawmart · Clawmart