A tiny API for big internet energy.

03 · Paid access

Buy a $5 pack for 500 generations

Buy a pack at /api-keys. After payment is confirmed, your API key is revealed once. Send it with either supported header format:

curl -X POST https://jestsprout.polsia.io/api/generate \
  -H "Authorization: Bearer js_live_your_key" \
  -H "content-type: application/json" \
  -d '{"theme":"a pigeon that knows everyone’s secrets"}'

curl -X POST https://jestsprout.polsia.io/api/generate \
  -H "X-API-Key: js_live_your_key" \
  -H "content-type: application/json" \
  -d '{"theme":"a pigeon that knows everyone’s secrets"}'

03 · x402 pay-per-call

Pay $0.01 USDC after the free allowance

After five successful generations for an IP on the current UTC day, send a valid X-PAYMENT header. Coinbase CDP verifies and settles the exact payment on Base before the concept is served. The fixed payment is 10000 atomic USDC units to 0x0E2C79D680016D1b13be69780e45Bb2bE175F16e using asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.

curl -X POST https://jestsprout.polsia.io/api/generate \
  -H "X-PAYMENT: <base64-encoded-x402-payment>" \
  -H "content-type: application/json" \
  -d '{"theme":"a pigeon that knows everyone’s secrets"}'

04 · Response

A complete concept result

A successful response contains the AI-generated coin name, uppercase ticker, human-readable description, and a hosted logo image URL. The example below shows the response shape; the values are generated for each request.

{
  "coinName": "string",
  "ticker": "string",
  "description": "human-readable concept description",
  "logoUrl": "<hosted logo image URL>",
  "logo_error_detail": "<bounded, redacted provider detail when fallback is used>",
  "logo_error": "unavailable",
  "conceptOnly": true
}

logoUrl always points to a hosted image. If the logo provider is unavailable after the built-in retry, the concept still succeeds with a deterministic SVG fallback and the safe, bounded logo_error_detail alongside logo_error: "unavailable".

05 · Remote MCP

Connect an agent at POST /mcp

JestSprout exposes a stateless Streamable HTTP JSON-RPC surface with one tool: generate_coin_concept. Its input is { theme: string }, and a successful tool result contains the same concept JSON as /api/generate, including logoUrl, optional logo_error and logo_error_detail, and conceptOnly: true.

curl -X POST https://jestsprout.polsia.io/mcp   -H "content-type: application/json"   -H "Authorization: Bearer js_live_your_key"   -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"generate_coin_concept","arguments":{"theme":"a pigeon that knows everyone’s secrets"}}}'

Authentication is optional. Omit credentials for 5 successful generations per IP per UTC day, send X-PAYMENT after the allowance for $0.01 USDC on Base, or send either X-API-Key or Authorization: Bearer <key> to use the existing paid key credits. The same access decision applies to REST and MCP.