Base
An Ethereum Layer 2 blockchain network launched by Coinbase that enables fast, low-cost on-chain transactions. Base serves as one of the foundational payment infrastructures for autonomous AI agent transactions.
Core Facts
Timeline (last 90 days)
In the UP host's test, Whisper's Base model output Traditional Chinese with severely degraded quality (garbled text at the end), while the Small model remained coherent up to the 10th minute but had homophone errors (such as hearing Word2Vec as WordOfTough).
UP host's actual test: FasterWhisper's Small model took 70 seconds to transcribe 10 minutes of audio, and the Base model took 28 seconds; the full 35 minutes 02 seconds took 253.3 seconds to transcribe, about 8.3x real time, outputting 1,209 subtitles.
Payment methods supported by Mentary AI include PayPal, cryptocurrency (ETH/USDC/USDT on Base), and Western Union/MoneyGram.
The payment methods officially listed by Aura Pro include PayPal, cryptocurrency on the Base chain (ETH/USDC/USDT), and Western Union/MoneyGram.
The conversion call GET /api/fx/convert?from=USD&to=EUR&amount=100 returns HTTP 402 when unpaid and quotes 1000 atomic units of USDC in the PAYMENT-REQUIRED response header, with the network as eip155:8453 (Base mainnet) and the scheme as exact.
The exact scheme means that an exact amount is required to be paid; eip155:8453 is the CAIP-2 chain identifier of the Base mainnet; USDC is the USD stablecoin on that chain.
RelayMarket's planned settlement is atomic: 90% to the seller and 10% to the platform, using the VM1 MetaMask Base USDC address specified by the platform owner as the marketplace vault.
Signing a correct EIP-3009 authorization with an empty wallet and sending it to the live API, the facilitator returns an invalid_exact_evm_insufficient_balance error, verifying at zero cost that the signature format, EIP-712 domain, amount, and payee are correct.
The Base chain is an Ethereum Layer 2 network built by Coinbase on OP Stack, with extremely low transaction fees and fast confirmation times.
One operator's autonomous agent earned 70.64 USDC for a single deliverable on Synmerco, released on October 16 via an escrow contract on the Base chain.
25 more timeline events
All Facts (20)
x402 is an open protocol that reuses the 402 status code (Payment Required) from the HTTP protocol, enabling software (especially AI Agents) to call APIs on a per-request pay-as-you-go basis and settle directly with cryptocurrency (typically USDC), without requiring accounts, API keys, or traditional checkout pages.
65%UnverifiedIn the UP host's test, Whisper's Base model output Traditional Chinese with severely degraded quality (garbled text at the end), while the Small model remained coherent up to the 10th minute but had homophone errors (such as hearing Word2Vec as WordOfTough).
50%UnverifiedUP host's actual test: FasterWhisper's Small model took 70 seconds to transcribe 10 minutes of audio, and the Base model took 28 seconds; the full 35 minutes 02 seconds took 253.3 seconds to transcribe, about 8.3x real time, outputting 1,209 subtitles.
50%UnverifiedPayment methods supported by Mentary AI include PayPal, cryptocurrency (ETH/USDC/USDT on Base), and Western Union/MoneyGram.
50%UnverifiedThe payment methods officially listed by Aura Pro include PayPal, cryptocurrency on the Base chain (ETH/USDC/USDT), and Western Union/MoneyGram.
50%UnverifiedThe conversion call GET /api/fx/convert?from=USD&to=EUR&amount=100 returns HTTP 402 when unpaid and quotes 1000 atomic units of USDC in the PAYMENT-REQUIRED response header, with the network as eip155:8453 (Base mainnet) and the scheme as exact.
50%UnverifiedThe exact scheme means that an exact amount is required to be paid; eip155:8453 is the CAIP-2 chain identifier of the Base mainnet; USDC is the USD stablecoin on that chain.
50%UnverifiedRelayMarket's planned settlement is atomic: 90% to the seller and 10% to the platform, using the VM1 MetaMask Base USDC address specified by the platform owner as the marketplace vault.
50%UnverifiedSigning a correct EIP-3009 authorization with an empty wallet and sending it to the live API, the facilitator returns an invalid_exact_evm_insufficient_balance error, verifying at zero cost that the signature format, EIP-712 domain, amount, and payee are correct.
50%UnverifiedThe Base chain is an Ethereum Layer 2 network built by Coinbase on OP Stack, with extremely low transaction fees and fast confirmation times.
50%UnverifiedThe service's paid endpoint catalog has now reached 244, all settled via pay.openfacilitator.io on Base mainnet using USDC (eip155:8453).
50%UnverifiedThe two new endpoints are priced at 0.0005 USDC per request, settled via the Base network.
50%UnverifiedThe recalibration service is billed per use, uses USDC on the Base chain, and settles through the x402 payment protocol.
50%UnverifiedAcross Base, Optimism and Ethereum mainnet, the EAS protocol shows that 733,203 of 4,986,045 attestations have been revoked, a revocation rate of nearly 15%.
50%UnverifiedOn the Base chain, the EAS indexer shows that 678,895 of 3,651,900 attestations have been revoked.
50%UnverifiedOn Base, three schemas (verifiedAccount, verifiedCountry, verifiedCoinbaseOne) account for 97% of all revocations, and all belong to the same issuer, Coinbase.
50%UnverifiedEAS has official deployments on Base and Optimism mainnet, and has spawned indexers like easscan.org that aggregate on-chain logs into a queryable GraphQL interface.
50%UnverifiedThe x402 payment network supports three chains: Base, Solana and Arc.
50%UnverifiedThe payment field in a real unpaid 402 response contains: scheme: exact, network: eip155:8453 (Base), asset: USDC contract address, amount: 10000 (i.e. 0.01 USDC), payTo: receiving address, maxTimeoutSeconds: 120.
50%UnverifiedIn the experiment, after the agent requested a data endpoint and the server returned a 402 challenge, the agent autonomously signed a micropayment transaction of 0.05 USDC on the Base L2 network and then obtained the data.
50%