# Services from plainchain.appin60.com on Zero

> plainchain.appin60.com serves 16 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/plainchain.appin60.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/plainchain.appin60.com/health.json

## Services

- [Plainchain ERC-20 Allowance Lookup](https://www.zero.xyz/c/plainchain-erc-20-allowance-lookup-8e78210b/llms.txt): $0.001042/call via x402. Returns the current ERC-20 token allowance (approved spending limit) granted by an owner to a spender on Base, Arbitrum, Ethereum, or Optimism, with a plain-language risk assessment.
- [Plainchain x402 Receipt Verifier](https://www.zero.xyz/c/plainchain-x402-receipt-verifier-52ddbaff/llms.txt): $0.002942/call via x402. Verifies an x402 USDC payment receipt on-chain by checking a settlement transaction hash, confirming the payer, recipient, and amount match expectations.
- [Plainchain Gas Price Oracle](https://www.zero.xyz/c/plainchain-gas-price-oracle-bd71bb87/llms.txt): $0.001042/call via x402. Returns current gas price, base fee, priority fee, and cost estimates for common transaction types on Base, Arbitrum, Ethereum, or Optimism
- [Plainchain Bazaar API Search](https://www.zero.xyz/c/plainchain-bazaar-api-search-c4195530/llms.txt): $0.001942/call via x402. Search a directory of pay-per-call blockchain data API endpoints by natural language query, returning ranked results with pricing and usage statistics
- [Plainchain Wallet Balances API](https://www.zero.xyz/c/plainchain-wallet-balances-api-34ef976a/llms.txt): $0.001942/call via x402. Returns native ETH and ERC-20 token balances (with USD values) for a given wallet address on Base, Arbitrum, Ethereum, or Optimism
- [Plainchain Block Data Endpoint](https://www.zero.xyz/c/plainchain-block-data-endpoint-e6527ecd/llms.txt): $0.001042/call via x402. Returns the latest block metadata (hash, number, gas usage, transaction count, base fee, timestamp) for a specified EVM-compatible chain
- [Plainchain Token Data Endpoint](https://www.zero.xyz/c/plainchain-token-data-endpoint-fd78c3de/llms.txt): $0.001942/call via x402. Returns on-chain token metadata and market data (name, symbol, decimals, supply, price, volume, liquidity) for a given ERC-20 contract address on Base, Arbitrum, Ethereum, or Optimism
- [Plainchain Verifiable Random Number Generator](https://www.zero.xyz/c/plainchain-verifiable-random-number-generator-e6cd4c74/llms.txt): $0.001042/call via x402. Returns a cryptographically verifiable random number derived from on-chain block hash, with optional dice and coin-flip results, on Base, Arbitrum, Ethereum, or Optimism.
- [Plainchain Transaction Decoder](https://www.zero.xyz/c/plainchain-transaction-decoder-19075929/llms.txt): $0.002942/call via x402. Decodes and retrieves detailed information about a blockchain transaction by hash, including token transfers, fees, status, and confirmations across Base, Arbitrum, Ethereum, and Optimism.
- [Plainchain Price Feed – Spot Prices for Crypto Symbols](https://www.zero.xyz/c/plainchain-price-feed-spot-prices-for-crypto-symbols-cb2c1726/llms.txt): $0.001042/call via x402. Returns current USD spot prices for one or more cryptocurrency symbols (e.g. ETH, BTC, SOL) sourced from Coinbase, paid per-call via x402 USDC on Base.
- [Plainchain Address Lookup](https://www.zero.xyz/c/plainchain-address-lookup-d897d0c4/llms.txt): $0.001942/call via x402. Returns address type classification, ERC-20 token metadata, proxy details, and a human-readable summary for any EVM address on Base, Arbitrum, Ethereum, or Optimism
- [Plainchain Fortune — Verifiable On-Chain Random Fortune](https://www.zero.xyz/c/plainchain-fortune-verifiable-on-chain-random-fortune-b4049075/llms.txt): $0.001042/call via x402. Returns a verifiably random fortune string selected by hashing the latest block on Base, providing tamper-resistant randomness anchored to blockchain state.
- [Plainchain x402 Echo](https://www.zero.xyz/c/plainchain-x402-echo-faed52c9/llms.txt): $0.001042/call via x402. Echoes back a verified x402 payment receipt, confirming that a micropayment was correctly received, parsed, and validated before granting access to Plainchain's blockchain data APIs.
- [Plainchain Bazaar Host Lookup](https://www.zero.xyz/c/plainchain-bazaar-host-lookup-695e2405/llms.txt): $0.001042/call via x402. Returns the list of available pay-per-call blockchain data resources offered by a given host in the Plainchain bazaar, including pricing and usage statistics.
- [Plainchain /v1/fact — Blockchain Fact of the Day](https://www.zero.xyz/c/plainchain-v1-fact-blockchain-fact-of-the-day-4753832a/llms.txt): $0.001042/call via x402. Returns a rotating crypto/blockchain historical fact along with a block number, chain name, and index, served pay-per-call via x402 on Base
- [Plainchain x402scan Register](https://www.zero.xyz/c/plainchain-x402scan-register-3728f8f4/llms.txt): $0.009942/call via x402. Registers your x402-enabled API origin with x402scan so its endpoints are discoverable and indexed

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)