feat(ecosystem): add Satoshi API — Bitcoin data with x402 micropayments

[Bortlesboat]

Summary

Adds Satoshi API to the x402 ecosystem.

Satoshi API is a Bitcoin data API with free endpoints for blocks, transactions, mempool, fees, and network data, plus x402-paid endpoints for AI analysis, transaction broadcast, next block prediction, and fee observatory.

x402 is live in production on https://bitcoinsapi.com using Base mainnet.

x402 Integration

• Returns 402 Payment Required with x402 payment requirements on paid endpoints
• 5 paid endpoints priced at $0.005-$0.01 USDC on Base
• Facilitator: x402.org/facilitator
• Chain: eip155:8453

Verify

# Real paid endpoint — returns 402 with payment requirements
curl -i https://bitcoinsapi.com/api/v1/ai/explain-tx/test123

# Free demo — test the full x402 flow without USDC
curl https://bitcoinsapi.com/api/v1/x402-demo
curl -H 'X-PAYMENT: demo' https://bitcoinsapi.com/api/v1/x402-demo

Links

• Website: https://bitcoinsapi.com
• GitHub: https://github.com/Bortlesboat/bitcoin-api
• x402 middleware: https://github.com/Bortlesboat/bitcoin-api-x402

Checklist

• metadata.json follows required format
• Logo added to public/logos/
• Live on Base mainnet, verifiable via curl above

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2

[vercel]

@Bortlesboat is attempting to deploy a commit to the Coinbase Team on Vercel.

A member of the Team first needs to authorize it.

[Bortlesboat]

Superseded by #1943 with updated metadata and logo.