Payment backends

We provide the connection, not the settlement. agent-tools hub wraps your API into an x402 endpoint and routes each payment to a third-party facilitator you choose. The free tiers, gas coverage and per-transaction fees below are each facilitator's own policy (pulled from their docs) — not ours. We never hold funds and take no cut.

Pick the backend whose terms suit you when you list a service. All backends below are mainnet, need no account/key, and the facilitator sponsors gas.

PayAI

DefaultMainnetNo key

Free up to 10,000 settlements/month with no account or key; beyond that ~$0.001/settlement (covers gas+RPC). 58 (scheme,network) pairs — widest chain coverage. Default backend.

Free tier10,000 settlements / month free, no API key
GasPayAI sponsors gas + RPC
Networks8453, 137, 42161, 43114, 1329, 196, 5eykt4UsFv
Terms set by PayAI, not by us.
PayAI's terms →

x402.fi

MainnetNo key

Open, no-auth facilitator covering Base/Ethereum/Polygon/Avalanche + Solana mainnet. Good Solana-mainnet alternative.

Free tierFree, no API key
GasFacilitator sponsors gas
Networks8453, 1, 137, 43114, 5eykt4UsFv
Terms set by x402.fi, not by us.
x402.fi's terms →

Mogami

MainnetNo key

Base-mainnet facilitator, also self-hostable via Docker — the path to running your own settlement later.

Free tierFree, no API key
GasFacilitator sponsors gas
Networks8453
Terms set by Mogami, not by us.
Mogami's terms →

PayAI (testnet)

TestnetNo key

Base Sepolia testnet — settles worthless test USDC. For dogfooding the full flow without real money.

Free tierFree
GasSponsored
Networks84532
Terms set by PayAI (testnet), not by us.
PayAI (testnet)'s terms →

More backends are added over time. Want one listed? Tell us →