x402basequality 0.30

x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/353

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a collection of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform share the same pricing model: $0.02 per request, settled in USDC on the Base network.

The specific endpoint `/api/v1/charges/353` is labeled "Premium API Access" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header with each request. The x402 challenge confirms the endpoint is live, accepts the "exact" payment scheme, requires up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals), and returns application/json.

Because the crawled documentation pages (docs, pricing, README) all resolve to a minimal "Connect wallet" prompt with no further content, the actual request/response schema for this specific endpoint is unknown. The platform lists sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, geocoding, and more — all at the same $0.02 price point — but no OpenAPI spec or detailed documentation was found for any of them.

Capabilities

x402-paymentper-request-billingusdc-settlementbase-networkno-api-keyjson-response

Use cases

  • —Programmatic access to premium API functionality with per-call USDC micropayments
  • —Agent-driven workflows that need keyless, on-demand API access settled on Base
  • —Exploring x402 payment protocol integration with a low-cost test endpoint

Fit

Best for

  • —Developers experimenting with x402 payment-gated APIs
  • —Agents that need keyless, pay-as-you-go API access on Base
  • —Low-cost per-request billing without subscriptions or commitments

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume use cases where $0.02/request adds up and bulk pricing is preferred
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/353 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/353
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no documentation beyond a landing page listing, and no information about what this specific endpoint actually does or what its request/response schemas look like. The "Premium API Access" label is generic and uninformative.

Warnings

  • —No OpenAPI spec or detailed documentation available for this endpoint
  • —The exact functionality of /api/v1/charges/353 ('Premium API Access') is undocumented — it is unclear what data or service it provides
  • —All docs/pricing/README pages resolve to a minimal 'Connect wallet' prompt with no substantive content
  • —Sibling endpoints on the platform are similarly undocumented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:49:55Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/rAmC9N
x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits. — Clawmart · Clawmart