CONNSKILL Growth Services (x402)
One origin, 57 endpoints, one price each, paid per call in USDC on Base via the x402 protocol. No account, no API key. The first request returns HTTP 402 with the price; the client pays and retries. Prices and the full catalogue are always live:
https://agent.connskill.com/openapi.json- schemas, prices,info.x-guidancehttps://agent.connskill.com/.well-known/x402- every paid endpoint with its pricehttps://agent.connskill.com/llms.txt- short human/agent readme
Two ways to call
Preferred: the MCP server (tools generated live from the spec, pays for you):
npx -y @connskill/mcp-growth-services with env X402_WALLET_KEY and X402_MAX_USD.
Without MCP: the bundled script (same payment path, prints JSON):
node scripts/x402-call.mjs prices # free: catalogue with prices
node scripts/x402-call.mjs GET /v1/locations '{"q":"germany"}' # free
node scripts/x402-call.mjs POST /v1/keyword-ideas '{"keyword":"agent commerce","location":"Germany"}'
For paid calls the script needs npm i x402-fetch viem once and X402_WALLET_KEY
set. Keep X402_MAX_USD at or below what a single call may cost (most are 0.03-0.20).
What to call for what
| Need | Endpoint | Price |
|---|---|---|
| Keyword ideas around a seed | POST /v1/keyword-ideas {keyword, location?} |
0.03 |
| Volume/CPC for up to 1000 keywords | POST /v1/keyword-metrics {keywords[], location?} |
0.15 |
| Same keywords across up to 30 locations, one payment | POST /v1/keyword-metrics-multi {keywords[], locations[]} |
0.15 x locations |
| Google SERP snapshot incl. AI overview, PAA, featured snippet | POST /v1/serp-report {keyword, location?, depth?} |
0.10-0.50 |
| Site audit: traffic, ranked keywords, competitors, backlinks, real on-page crawl | POST /v1/site-audit {target} |
1.00 |
| Backlinks / competitors / domain rank / traffic estimate | POST /v1/backlinks-report, /v1/competitors, /v1/domain-rank, /v1/traffic-estimate |
0.08-0.20 |
| Vet another x402 seller (live 402, USDC inflow, self-dealing share) | POST /v1/trust-check {origin} |
0.05 |
| Phone number for an SMS verification (quote first, free) | GET /sms/v1/sms-quote?service=... then POST /sms/v1/sms-order |
0.25-3.00 |
| Receive-only inbox for 7 days | POST /mail/v1/mail-inbox then POST /mail/v1/mail-messages (free) |
0.50 |
| GDPR-compliant chat completion hosted in Germany (tool use supported) | POST /ai/v1/eu-chat {messages[], model?, tools?} |
0.10 |
| Text embeddings, EU-hosted | POST /ai/v1/eu-embed {input} |
0.05 |
Locations are country/city names or DataForSEO codes; GET /v1/locations?q=germany lists countries and languages for free.
Ask for the free quote/catalogue endpoint before any paid call when the price is a range.
Rules of thumb
- Never put a main wallet's key in
X402_WALLET_KEY. Fund a dedicated wallet with a few USDC. - A 402 response is the price list, not an error: read
accepts[0].amount(micro-USDC). - Deliveries are idempotent: a paid response can be re-fetched with the same payment
header within 24 h if the connection dropped (
redelivery). - If you want an endpoint that does not exist yet, post it to
POST /v1/wishlist(free).