Pricing

Start free. Pay per call only when you need more. No subscription, no minimum.

Free

25 calls a day per address with no key.
100 calls a day with a free key from POST /v1/keys/free.
Meta and freshness endpoints never count.

Pay per call: x402

USD 0.01 per call, paid in USDC on Base with the x402 protocol. Works on REST and on the MCP server. Any x402-capable agent pays automatically.

Packs by card: agents

Stripe Machine Payments with Shared Payment Tokens. USD 0.50 for 50 calls, USD 2 for 250, USD 5 for 750. The agent receives an API key holding the pack.

Packs by card: developers

Stripe Checkout. USD 10 for 1,200 calls (0.83 cents each), USD 50 for 7,000 calls (0.71 cents each). Credit never expires while the service runs.

Buy a developer pack

Either use the API directly:

curl -X POST https://data.cleantechcontent.co.uk/v1/credits/checkout \
  -H "content-type: application/json" -d '{"pack":"1200","email":"you@example.com"}'

The response holds your new API key and a Stripe Checkout link. Pay by card on the link; the key is credited within seconds. Keep the key: it is shown once. To top up an existing key, include "api_key" in the body.

Or use the buttons below, which do the same thing in your browser.

What counts as a call

One request to any /v1/tariffs* or /v1/charging* endpoint, or one MCP tool call other than get_data_freshness. Cached responses count. Errors caused by us (5xx) do not.

VAT

Prices are in US dollars. No VAT is charged because the operator is not VAT registered; this page will say if that changes.

Refunds

Unused credit on a developer pack is refundable within 14 days of purchase on request to david@cleantechcontent.co.uk. Per-call payments and agent packs are final once the call has been served.