x402 Blockchain API
x402 blockchain APIs: RPC, indexing, and on-chain data services that accept x402 payments per call. Discover them as machine-readable JSON and pay onchain through the 402 flow.
BLOCKCHAIN SERVICES ── 44 total ── for live status visit /status
| NAME | DESCRIPTION | EP | $/REQ | UPTIME 24H | NETWORKS |
|---|---|---|---|---|---|
| Utilia Solana Preflight | Machine-payable Solana transaction intelligence for autonomous agents: live priority-fee quantiles, transaction simulation, confirmed-transaction diagnostics, and token mint risk analysis. Every response is deterministic structured JSON, paid per call in mainnet USDC over x402 v2, with no account or API key. | 4 | $0.002 | 100.00% | SOL |
| LiquidPad | Pay-per-request LiquidPad endpoints. Verify whether a token was deployed via LiquidPad (ERC-8004 anchored), get full agent provenance with fee split, or read the full agents registry snapshot. | 3 | $0.001 | 100.00% | BSE |
| Base Agent Evidence & Route API | Paid, finality-aware Base account and transaction evidence, bounded activity lookup, and dry Base-USDC-to-NEAR-USDC route quotes. | 5 | $0.001 | 100.00% | BSE |
| GenTech Labs x402 Gateway | Pay-per-call API gateway with 6 services across Base Network. Token security scoring, wallet portfolio analysis, on-chain agent discovery, market intelligence, DeFi LP analytics with efficiency scoring, and NFT search. All endpoints use x402 micropayments (USDC on Base). | 6 | $0.005 | 100.00% | BSE |
| LoneStarOracle ContractCheck | Paid API that checks a deployed contract address on Ethereum, Base, BSC, Arbitrum or Polygon and returns source verification status, proxy type, owner address, compiler version and risk flags. $0.05 per call via x402. | 1 | $0.05 | 100.00% | BSE/SOL |
| chainkit | 17 on-chain compute primitives in one x402 API: keccak256, ABI encode/decode, function selectors, EIP-712 hashing + signature recovery/verification, merkle root/proof/verify, CREATE/CREATE2 address derivation, ENS namehash, checksum, unit conversion, RLP encode/decode. Pure computation, no data dependencies. 0.02 USDC per call on Base. | 1 | $0.02 | 100.00% | BSE |
| ZERO | Two paid on-chain analysis endpoints on Base, sold by an autonomous agent that runs on its own revenue. /api/contract-audit (0.05 USDC) returns a structured smart-contract risk report from verified source: owner powers, mint/blacklist/pause authority, fee logic, upgradeability, with the function or modifier name quoted for every finding, and an explicit "source not verified" when it cannot be determined. /api/wallet-brief (0.02 USDC) returns a plain-language activity brief for any Base address. No account, no API key, no signup: pay USDC on Base to the payTo address (x402 exact scheme, or a plain transfer plus &tx=<hash>) and the report returns immediately. | 2 | $0.02 | 100.00% | BSE |
| LedgerBrain x402 KYA KYT KYE Compliance API | x402 pay-per-use KYA, KYT, and KYE crypto compliance API for AI agents. Provides address risk reports, transaction risk screening, entity due diligence, compliance risk screening, and auditable report outputs via USDC payments on Base. No LedgerBrain API key required for x402 endpoints. | 3 | $0.10 | 100.00% | BSE |
| Stakevia | Pay-per-request Solana validator due-diligence reports. | 1 | $1.00 | 100.00% | SOL |
| Token Safety Check (x402) | Token safety & rug-pull/honeypot risk check — scans an ERC-20's bytecode & ownership on Base/Ethereum for mint, blacklist, pause, fee traps Pay-per-call USDC on Base via x402; free agent-readable help doc at the base path. | 1 | $0.02 | 100.00% | BSE |
| Whale Intelligence API | Resolves Ethereum addresses to entity labels, name tags and categories from a database of about 412,000 labeled addresses, and returns large ETH transfers with labeled counterparties. Paid per call in USDC on Base. | 2 | $0.01 | 100.00% | BSE |
| AeroCheck | Takes an Aerodrome or Uniswap v2 compatible pool address on Base and returns per token risk scores, honeypot status, risk flags and a safe, caution or avoid verdict for the pair. | 1 | $0.05 | 100.00% | BSE/SOL |
| SYNTHORA RPC Receipt | Returns an EVM transaction receipt (status, gas used, block number, log count) for a given transaction hash via eth_getTransactionReceipt, with an Ed25519 signature over the response. First 3 calls per wallet are free using an X-WALLET header. | 1 | $0.10 | 100.00% | BSE |
| Hugen Intel API | Crypto due diligence API. Token, wallet, contract and DeFi yield reports combining security checks, market data and an AI risk score from 0 to 100 with red and green flags. Full report $0.50, lite variant without AI prose $0.02, in USDC on Base or Solana. | 3 | $0.50 | 100.00% | BSE/SOL |
| ForgeMesh Anomaly Tracker | Pay-per-call anomaly and signal API: sequence anomaly scoring on chain event windows, mempool and whale monitoring, stablecoin depeg checks, plus aviation and GitHub signal endpoints. USDC on Base, from $0.01 per call, no signup. | 10 | $0.01 | 100.00% | BSE |
| Loyal Spark | Paid API for onchain loyalty programs on Base: loyalty token deployment, minting to customer wallets, rewards catalog, vouchers and P2P exchange, usable by agents over REST or MCP. | 10 | $0.001 | 100.00% | BSE |
| Deepnets API | Solana on-chain analysis API: token safety scoring, holder breakdowns, wallet funding-network graphs, social research, trending feed and watchlist. Paid per call in USDC on Solana via x402. | 10 | $0.01 | 100.00% | SOL |
| OneSource | RPC API for Ethereum mainnet and Sepolia, with 25 pay-per-call endpoints (blocks, balances, transactions, receipts, event logs, ENS, contracts, NFTs) payable in USDC on Base via x402, with no API key. | 10 | $0.001 | 100.00% | BSE |
| WalletRisk | Risk scoring for EVM wallet addresses: transaction history, DeFi exposure and behavioral flags, returned as a numeric score via a single paid endpoint. | 1 | $0.15 | 100.00% | BSE/SOL |
| SYNTHORA Base Block Metrics | Returns live Base mainnet chain metrics (latest block number, base fee per gas, gas used) sourced from a public Base RPC. Priced at 0.001 USDC per call via x402 on Base, with the first 3 calls free per wallet using an X-WALLET header. | 1 | $0.10 | 100.00% | BSE |
| SYNTHORA RPC Transaction by Hash | Returns the full details of an EVM transaction given its hash, across Base, Ethereum, Polygon, Arbitrum and Optimism. Responses include an Ed25519 signed receipt and the upstream RPC endpoint used. The first 3 calls per wallet are free via the X-WALLET header. | 1 | $0.10 | 100.00% | BSE |
| SolSigs | Real-time Solana data APIs plus ProofGuard receipts for AI agents: 22 specialist workers paid per call in USDC via x402 - DEX prices, arbitrage, wallet intelligence, launch detection, plus signed trust scores and payment/fulfillment receipts. No API keys, no subscriptions. | 22 | $0.001 | 100.00% | SOL |
| Synthora RPC Contract Metadata | Returns contract metadata for an EVM address (name, symbol, decimals, is-contract, is-erc20) via on-chain RPC, with Ed25519-signed responses. First 3 calls free per wallet via the X-WALLET header, then paid in USDC via x402 on Base. | 1 | $0.10 | 100.00% | BSE |
| anchor-x402 | 16 pay-per-call x402 services for AI agents: on-chain Merkle anchoring, wallet/address security screening, Web3 data resolution (tx & calldata decode, ENS name resolution), token pricing, content analysis, and verifiable randomness. No API keys or accounts. Settle per request on Base USDC, Solana USDC, or Polygon JPYC (1 yen / anchor) | 16 | $0.001 | 100.00% | BSE/POL/SOL |
| Holoworld $FIGHT Pass | Holoworld x402 mint endpoint on Solana. GET /api/mint mints the $FIGHT Pass for 50 USDC per request. | 1 | $50.00 | 100.00% | SOL |
| BaseSentinel | Base threat-intel API for AI agents (M2M). HTTP 402 + USDC on Base. On-demand contract scan (SAFE/SCAM), daily threat feed, and live threat stream. Settlement via X-Payment-Proof (USDC tx hash). | 3 | $0.005 | 100.00% | BSE |
| Hugen DeFi Intelligence API | DeFi data and token security API. Endpoints cover token and address risk checks, phishing and approval lookups, bridge routes and quotes, plus chain level stablecoin supply, DEX volume and protocol fees. JSON over GET, $0.01 per call in USDC on Base or Solana. | 6 | $0.01 | 100.00% | BSE/SOL |
| LoneStarOracle ChainScout | Paid on-chain intelligence API returning whale transfers, trending tokens and DeFi protocol TVL shifts on Base and Ethereum, priced per query in USDC. | 5 | $0.05 | 100.00% | BSE/SOL |
| paypi — Solana intelligence for AI agents | Solana on-chain intelligence sold per call in USDC over x402. decode: turn any transaction (by signature or raw base64) into human-readable instructions, accounts and program names across 46 known mainnet programs. simulate: dry-run a transaction against live mainnet state before signing, returning compute units, logs and failure reasons via a paid RPC. kamino-liquidation: liquidation risk for any wallet on Kamino lending — LTV vs liquidation LTV, health buffer, per-asset liquidation prices and risk tier, using ported on-chain math rather than estimates. Charge-on-success: failed or refused calls are never charged. Free request/response examples at /samples. | 3 | $0.005 | 100.00% | BSE/SOL |
| SYNTHORA RPC Network Metadata | Returns chain metadata for five EVM chains (Ethereum, Base, Polygon, Arbitrum, Optimism): chain ID, latest block, gas price and finality, read from public RPC endpoints and returned with an Ed25519 signed receipt. Three free calls per wallet via the X-WALLET header. | 1 | $0.10 | 100.00% | BSE |
| SYNTHORA MEV Exposure Detector | Checks a Base transaction hash for MEV exposure. Identifies whether it is a DEX swap and scans neighbouring transactions in the same block for sandwich, frontrunning or backrunning patterns, returning one of no_swap, swap_exposed, frontrun_risk or sandwich. Heuristic, Ed25519-signed. | 1 | $0.10 | 100.00% | BSE |
| SYNTHORA RPC Proxy Detect | Checks an EVM contract for EIP-1967 style proxy slots and returns implementation, admin and beacon addresses when present. Responses are Ed25519 signed. Legacy or non standard proxy slots are not resolved. 3 free calls per wallet via the X-WALLET header, then $0.001 USDC on Base. | 1 | $0.10 | 100.00% | BSE |
| contract-guard API | Pre-interaction risk signals for any EVM contract/token address. USDC on Base via x402. | 1 | $0.005 | 100.00% | BSE |
| fry.farm x402 Agentic Actions | 15 pay-per-call USDC endpoints on Algorand mainnet: DeFi/DePIN data feeds plus non-custodial transaction builders (staking, LP farming, NFT mint, P2P offers). Builders return unsigned atomic groups - agents sign with their own wallet and submit. No API keys, no accounts. Free machine-readable catalog at https://fry.farm/x402/catalog | 15 | $0.001 | 100.00% | |
| LoneStarOracle TokenScope | Returns a risk report for an ERC-20 token contract: risk score, GoPlus security flags, honeypot detection, liquidity, top-holder concentration, ownership status and an AI analyst verdict. | 1 | $0.15 | 100.00% | BSE/SOL |
| SYNTHORA Contract Code Check (eth_getCode) | Checks whether an EVM address is a contract using eth_getCode, reporting code size and EIP-7702 delegation status in an Ed25519 signed JSON response. Three free calls per wallet are available via the X-WALLET header. | 1 | $0.10 | 93.48% | BSE |
| SNTL Helium Intelligence | Pay-per-query intelligence over the Helium DePIN network, settled on Solana. A datalake half a million records deep and growing — over a year of on-chain history, AI-enhanced and classified: threat heuristics, anomaly detection, yield-loss and yield-recovery attribution, hotspot configuration and location, and geo-spatial binding of blockchain activity (lat/long + time) to real economic events. The moment a wallet is flagged as an anomaly, its full causal history becomes queryable. Agents POST read-only SQL and receive structured rows — flat $0.01 USDC per query via standard x402 (PayAI facilitator), first tier free, no signup or API key; plus single-event lookup by transaction id and a free wallet-history endpoint. Built for Fleet Managers, Helium hotspot owners, and every party in the Helium ecosystem. | 1 | $0 | 77.78% | SOL |
| SYNTHORA ERC-20 Token Balance | Returns the ERC-20 token balance of a holder address by calling balanceOf on Base and other EVM chains, with raw and decimal-adjusted values, token symbol and the RPC endpoint used. Responses carry an Ed25519 signed receipt. Three free calls per wallet via the X-WALLET header. | 1 | $0.10 | 73.91% | BSE |
| VIGIL | Keyless onchain security scanner for Base. 14 MCP tools incl honeypot detection, liquidity lock, approval simulation, and a 6-source consensus verdict. Free core checks; premium tools via x402 USDC on Base. | 3 | $0.005 | 0.00% | BSE |
| SYNTHORA Gas & MEV Oracle | Returns a recommended gas price, an estimated transaction cost, a congestion level and an MEV risk rating for Base. Responses are Ed25519 signed. Three free calls per wallet via the X-WALLET header, then paid per call in USDC. | 1 | $0.001 | 0.00% | BSE |
| SYNTHORA Tx Intent Classifier | Decodes a Base or Ethereum transaction from a tx hash or raw calldata and returns the decoded function, risk flags such as unlimited token approvals, and a risk verdict with an Ed25519 signed receipt. | 1 | $0.001 | 0.00% | BSE |
| SYNTHORA Native Balance (eth_getBalance) | Returns the native coin balance of an EVM address (wei and decimal) via eth_getBalance on Base, Ethereum and other chains, with an Ed25519 signed response receipt. 0.001 USDC per call over x402 on Base; first 3 calls per wallet are free with the X-WALLET header. | 1 | $0.001 | 0.00% | BSE |
| SYNTHORA ENS Resolver | ENS lookups on Ethereum mainnet: name to address, or address to primary name with forward verification. Responses carry an Ed25519 signature. First 3 calls per wallet are free via the X-WALLET header. $0.001 USDC per call on Base. | 1 | $0.001 | 0.00% | BSE |
| Sol Node Labs | Pseudonymous pay-per-call crypto risk intelligence: deterministic Solidity triage, Base token risk screening, and vetted crypto bounty intelligence. USDC via x402 on Base and Solana; no account or API key. | 3 | $0.01 | 0.00% | BSE/SOL |
44 of 44 services ── category: Blockchain ── all services