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Social Intel API uses the x402 protocol for payment. Instead of API keys or subscriptions, you pay per request in USDC. Your x402 client library handles payment automatically.

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How it works

  1. You send a request to the API
  2. The API responds with HTTP 402 and payment details
  3. Your x402 client automatically pays the specified USDC amount
  4. The client retries the request with a payment proof header
  5. The API verifies payment on-chain and returns results

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Supported chains

ChainAssetNetwork
BaseUSDCMainnet
SolanaUSDCMainnet

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Wallet setup

You need a wallet with USDC on Base or Solana. Each request costs 0.10–0.10–0.26 plus ~$0.001 in gas.

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Base (EVM) — fastest path

Option A: Buy USDC directly on Base
  1. Create a Coinbase account (or use Coinbase Wallet)
  2. Buy USDC and select Base network at checkout — no bridging needed
  3. Export your private key from MetaMask/Coinbase Wallet
  4. Pass it to your x402 client
Option B: Bridge from Ethereum
  1. Have USDC on Ethereum mainnet
  2. Bridge to Base via bridge.base.org
Keep at least 1ofETHonBaseforgas.Eachx402paymentuses 1 of ETH on Base for gas. Each x402 payment uses ~0.001 in gas.

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Solana

  1. Get a Solana wallet private key (base58 format)
  2. Buy USDC on Solana via Coinbase or Jupiter
  3. Pass the private key to your x402 client

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Dynamic pricing

The price depends on how many results you request:
limitPrice
1-20$0.10
50$0.16
100$0.26
Formula: price = $0.10 + max(0, limit - 20) * $0.002 The price is included in the 402 response headers, so your client always knows the exact cost before paying.

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No API keys needed

With x402, payment is authentication. There are no API keys to manage, no OAuth flows, no rate limit tiers. Any wallet with USDC can use the API immediately.

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Using AgentCash (easiest)

If you’re building with AI agents, AgentCash handles x402 payments for you: 
npx agentcash@latest discover https://socialintel.dev
AgentCash manages wallet setup, USDC funding, and payment — so your agent just calls the API.